P. -H. Chu - Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong;

P. -H. Chu
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Name
P. -H. Chu
Affiliation
Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong;
City
Hong Kong
Country
Hong Kong

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Nuclear Experiment (20)
 
Physics - Instrumentation and Detectors (16)
 
Nonlinear Sciences - Pattern Formation and Solitons (8)
 
High Energy Physics - Experiment (7)
 
High Energy Physics - Phenomenology (6)
 
Physics - Superconductivity (6)
 
Physics - Strongly Correlated Electrons (6)
 
Nuclear Theory (4)
 
Physics - Atomic Physics (4)
 
Solar and Stellar Astrophysics (3)
 
Physics - Materials Science (3)
 
Physics - Other (2)
 
High Energy Physics - Theory (1)
 
General Relativity and Quantum Cosmology (1)
 
Nonlinear Sciences - Exactly Solvable and Integrable Systems (1)
 
High Energy Physics - Lattice (1)
 
Physics - Optics (1)
 
Physics - Data Analysis; Statistics and Probability (1)
 
Cosmology and Nongalactic Astrophysics (1)
 
Physics - Plasma Physics (1)
 
Physics - Computational Physics (1)
 
Physics - Mesoscopic Systems and Quantum Hall Effect (1)

Publications Authored By P. -H. Chu

We present experimental results to probe an exotic spin-dependent interaction for polarized electrons. The experiment employs a spin-exchange relaxation-free (SERF) magnetometer, as both a source of 100 % polarized electrons and a detector. In this experimental approach, an interaction between the SERF polarized electrons and unpolarized atoms of a solid-state mass was studied. Read More

The break-through voltage over small gaps has been investigated for differing gap distances, gas pressures, and gas temperatures in nitrogen, neon, argon and xenon gases. A deviation from Paschen's law at micro gap distances has been found. The breakthrough behavior of the fill gas in colder environments was tested as well. Read More

We present new limits on exotic keV-scale physics based on 478 kg d of MAJORANA DEMONSTRATOR commissioning data. Constraints at the 90% confidence level are derived on bosonic dark matter (DM) and solar axion couplings, Pauli exclusion principle violating (PEPV) decay, and electron decay using monoenergetic peak signal-limits above our background. Our most stringent DM constraints are set for 11. Read More

A search for Pauli-exclusion-principle-violating K-alpha electron transitions was performed using 89.5 kg-d of data collected with a p-type point contact high-purity germanium detector operated at the Kimballton Underground Research Facility. A lower limit on the transition lifetime of 5. Read More

The Majorana Demonstrator searches for neutrinoless double-beta decay of $^{76}$Ge using arrays of high-purity germanium detectors. If observed, this process would demonstrate that lepton number is not a conserved quantity in nature, with implications for grand-unification and for explaining the predominance of matter over antimatter in the universe. A problematic background in such large granular detector arrays is posed by alpha particles. Read More

Neutrinoless double-beta decay searches seek to determine the nature of neutrinos, the existence of a lepton violating process, and the effective Majorana neutrino mass. The {\sc Majorana} Collaboration is assembling an array of high purity Ge detectors to search for neutrinoless double-beta decay in $^{76}$Ge. The {\sc Majorana Demonstrator} is composed of 44. Read More

The MAJORANA Collaboration is constructing a system containing 44 kg of high-purity Ge (HPGe) detectors to demonstrate the feasibility and potential of a future tonne-scale experiment capable of probing the neutrino mass scale to ~15 meV. To realize this, a major goal of the MAJORANA DEMONSTRATOR is to demonstrate a path forward to achieving a background rate at or below 1 count/(ROI-t-y) in the 4 keV region of interest (ROI) around the Q-value at 2039 keV. This goal is pursued through a combination of a significant reduction of radioactive impurities in construction materials and analytical methods for background rejection, for example using powerful pulse shape analysis techniques profiting from the p-type point contact HPGe detectors technology. Read More

We propose a novel experimental approach to explore exotic spin-dependent interactions using a spin-exchange relaxation-free (SERF) magnetometer, the most sensitive non-cryogenic magnetic-field sensor. This approach studies the interactions between optically polarized electron spins located inside a vapor cell of the SERF magnetometer and unpolarized or polarized particles of external solid-state objects. The coupling of spin-dependent interactions to the polarized electron spins of the magnetometer induces the tilt of the electron spins, which can be detected with high sensitivity by a probe laser beam similarly as an external magnetic field. Read More

The MAJORANA Collaboration is constructing the MAJORANA Demonstrator, an ultra-low background, 44-kg modular high-purity Ge (HPGe) detector array to search for neutrinoless double-beta decay in Ge-76. The phenomenon of surface micro-discharge induced by high-voltage has been studied in the context of the MAJORANA Demonstrator. This effect can damage the front-end electronics or mimic detector signals. Read More

2016Feb
Affiliations: 1The Majorana Collaboration, 2The Majorana Collaboration, 3The Majorana Collaboration, 4The Majorana Collaboration, 5The Majorana Collaboration, 6The Majorana Collaboration, 7The Majorana Collaboration, 8The Majorana Collaboration, 9The Majorana Collaboration, 10The Majorana Collaboration, 11The Majorana Collaboration, 12The Majorana Collaboration, 13The Majorana Collaboration, 14The Majorana Collaboration, 15The Majorana Collaboration, 16The Majorana Collaboration, 17The Majorana Collaboration, 18The Majorana Collaboration, 19The Majorana Collaboration, 20The Majorana Collaboration, 21The Majorana Collaboration, 22The Majorana Collaboration, 23The Majorana Collaboration, 24The Majorana Collaboration, 25The Majorana Collaboration, 26The Majorana Collaboration, 27The Majorana Collaboration, 28The Majorana Collaboration, 29The Majorana Collaboration, 30The Majorana Collaboration, 31The Majorana Collaboration, 32The Majorana Collaboration, 33The Majorana Collaboration, 34The Majorana Collaboration, 35The Majorana Collaboration, 36The Majorana Collaboration, 37The Majorana Collaboration, 38The Majorana Collaboration, 39The Majorana Collaboration, 40The Majorana Collaboration, 41The Majorana Collaboration, 42The Majorana Collaboration, 43The Majorana Collaboration, 44The Majorana Collaboration, 45The Majorana Collaboration, 46The Majorana Collaboration, 47The Majorana Collaboration, 48The Majorana Collaboration, 49The Majorana Collaboration, 50The Majorana Collaboration, 51The Majorana Collaboration, 52The Majorana Collaboration, 53The Majorana Collaboration, 54The Majorana Collaboration, 55The Majorana Collaboration, 56The Majorana Collaboration, 57The Majorana Collaboration, 58The Majorana Collaboration, 59The Majorana Collaboration, 60The Majorana Collaboration, 61The Majorana Collaboration, 62The Majorana Collaboration, 63The Majorana Collaboration, 64The Majorana Collaboration, 65The Majorana Collaboration, 66The Majorana Collaboration, 67The Majorana Collaboration, 68The Majorana Collaboration, 69The Majorana Collaboration, 70The Majorana Collaboration, 71The Majorana Collaboration, 72The Majorana Collaboration, 73The Majorana Collaboration, 74The Majorana Collaboration

We report the first measurement of the total MUON flux underground at the Davis Campus of the Sanford Underground Research Facility at the 4850 ft level. Measurements were done with the Majorana Demonstrator veto system arranged in two different configurations. The measured total flux is (5. Read More

The MAJORANA collaboration is constructing the MAJORANA DEMONSTATOR at the Sanford Underground Research Facility at the Homestake gold mine, in Lead, SD. The apparatus will use Ge detectors, enriched in isotope \nuc{76}{Ge}, to demonstrate the feasibility of a large-scale Ge detector experiment to search for neutrinoless double beta decay. The long half-life of this postulated process requires that the apparatus be extremely low in radioactive isotopes whose decays may produce backgrounds to the search. Read More

Neutrinoless double beta decay searches play a major role in determining neutrino properties, in particular the Majorana or Dirac nature of the neutrino and the absolute scale of the neutrino mass. The consequences of these searches go beyond neutrino physics, with implications for Grand Unification and leptogenesis. The \textsc{Majorana} Collaboration is assembling a low-background array of high purity Germanium (HPGe) detectors to search for neutrinoless double-beta decay in $^{76}$Ge. Read More

A $\delta N$ formalism is used to study the non-Gaussianity of the primordial curvature perturbation on an uniform density hypersurfaces generated by the warm inflation for the first time. After introducing the framework of the warm inflation and the $\delta N$ formalism, we obtain an analytic expression for the nonlinear parameter $f_{NL}$ that describes the non-Gaussianity in slow roll approximation, and find that the $\delta N$ formalism gives a very good result. We analyse the magnitude of $f_{NL}$ and compare our result with those of the standard inflation. Read More

The MAJORANA Collaboration is constructing the MAJORANA DEMONSTRATOR, an ultra-low background, modular, HPGe detector array with a mass of 44-kg (29 kg 76Ge and 15 kg natGe) to search for neutrinoless double beta decay in Ge-76. The next generation of tonne-scale Ge-based neutrinoless double beta decay searches will probe the neutrino mass scale in the inverted-hierarchy region. The MAJORANA DEMONSTRATOR is envisioned to demonstrate a path forward to achieve a background rate at or below 1 count/tonne/year in the 4 keV region of interest around the Q-value of 2039 keV. Read More

We report new measurements of the doubly-polarized photodisintegration of $^3$He at an incident photon energy of 16.5 MeV, carried out at the High Intensity $\gamma$-ray Source (HI$\gamma$S) facility located at Triangle Universities Nuclear Laboratory (TUNL). The spin-dependent double-differential cross sections and the contribution from the three--body channel to the Gerasimov-Drell-Hearn (GDH) integrand were extracted and compared with the state-of-the-art three--body calculations. Read More

We examine the characteristics of the pi/2 pulse for simultaneously rotating two spin species of different gyromagnetic ratios with the same sign. For a pi/2 pulse using a rotating magnetic field, we derive the equation relating the frequency and strength of the pulse to the gyromagnetic ratios of the two particles and the strength of the constant holding field. For a pi/2 pulse using a linear oscillatory magnetic field, we obtain the solutions numerically, and compare them with the solutions for the rotating pi/2 pulse. Read More

We describe a proposed experimental search for exotic spin-coupled interactions using a solid-state paramagnetic insulator. The experiment is sensitive to the net magnetization induced by the exotic interaction between the unpaired insulator electrons with a dense, non-magnetic mass in close proximity. An existing experiment has been used to set limits on the electric dipole moment of the electron by probing the magnetization induced in a cryogenic gadolinium gallium garnet sample on application of a strong electric field. Read More

We investigate properties of strange quark matter in the framework of SU(3) Nambu--Jona-Lasinio(NJL) model with vector interaction under strong magnetic fields. The effects of vector-isoscalar and vector-isovector interaction on the equation of state of strange quark matter are investigated, and it is found that the equation of state is not sensitive to the vector-isovector interaction, however, a repulsive interaction in the vector-isoscalar channel gives a stiffer equation of state for cold dense quark matter. In the presence of magnetic field, gluons will be magnetized via quark loops, and the contribution from magnetized gluons to the equation of state is also estimated. Read More

We utilize ultrafast optical measurement to study the quasiparticle relaxation in stoichiometric LiFeAs and nearly optimally doped (BaK)Fe2As2 crystals. According to our temperature-dependent studies of LiFeAs, we have observed pseudogap-like feature at onset temperature of ~ 55 K, which is above Tc = 15 K. In addition, the onset temperature of pseudogap ~90K was also observed in Ba0. Read More

2014Jun
Authors: A. J. Bevan, B. Golob, Th. Mannel, S. Prell, B. D. Yabsley, K. Abe, H. Aihara, F. Anulli, N. Arnaud, T. Aushev, M. Beneke, J. Beringer, F. Bianchi, I. I. Bigi, M. Bona, N. Brambilla, J. B rodzicka, P. Chang, M. J. Charles, C. H. Cheng, H. -Y. Cheng, R. Chistov, P. Colangelo, J. P. Coleman, A. Drutskoy, V. P. Druzhinin, S. Eidelman, G. Eigen, A. M. Eisner, R. Faccini, K. T . Flood, P. Gambino, A. Gaz, W. Gradl, H. Hayashii, T. Higuchi, W. D. Hulsbergen, T. Hurth, T. Iijima, R. Itoh, P. D. Jackson, R. Kass, Yu. G. Kolomensky, E. Kou, P. Križan, A. Kronfeld, S. Kumano, Y. J. Kwon, T. E. Latham, D. W. G. S. Leith, V. Lüth, F. Martinez-Vidal, B. T. Meadows, R. Mussa, M. Nakao, S. Nishida, J. Ocariz, S. L. Olsen, P. Pakhlov, G. Pakhlova, A. Palano, A. Pich, S. Playfer, A. Poluektov, F. C. Porter, S. H. Robertson, J. M. Roney, A. Roodman, Y. Sakai, C. Schwanda, A. J. Schwartz, R. Seidl, S. J. Sekula, M. Steinhauser, K. Sumisawa, E. S. Swanson, F. Tackmann, K. Trabelsi, S. Uehara, S. Uno, R. van der Water, G. Vasseur, W. Verkerke, R. Waldi, M. Z. Wang, F. F. Wilson, J. Zupan, A. Zupanc, I. Adachi, J. Albert, Sw. Banerjee, M. Bellis, E. Ben-Haim, P. Biassoni, R. N. Cahn, C. Cartaro, J. Chauveau, C. Chen, C. C. Chiang, R. Cowan, J. Dalseno, M. Davier, C. Davies, J. C. Dingfelder, B. Eche nard, D. Epifanov, B. G. Fulsom, A. M. Gabareen, J. W. Gary, R. Godang, M. T. Graham, A. Hafner, B. Hamilton, T. Hartmann, K. Hayasaka, C. Hearty, Y. Iwasaki, A. Khodjamirian, A. Kusaka, A. Kuzmin, G. D. Lafferty, A. Lazzaro, J. Li, D. Lindemann, O. Long, A. Lusiani, G. Marchiori, M. Martinelli, K. Miyabayashi, R. Mizuk, G. B. Mohanty, D. R. Muller, H. Nakazawa, P. Ongmongkolkul, S. Pacetti, F. Palombo, T. K. Pedlar, L. E. Piilonen, A. Pilloni, V. Poireau, K. Prothmann, T. Pulliam, M. Rama, B. N. Ratcliff, P. Roudeau, S. Schrenk, T. Schroeder, K. R. Schubert, C. P. Shen, B. Shwartz, A. Soffer, E. P. Solodov, A. Somov, M. Starič, S. Stracka, A. V. Telnov, K. Yu. Todyshev, T. Tsuboyama, T. Uglov, A. Vinokurova, J. J. Walsh, Y. Watanabe, E. Won, G. Wormser, D. H. Wright, S. Ye, C. C. Zhang, S. Abachi, A. Abashian, K. Abe, K. Abe, N. Abe, R. Abe, T. Abe, T. Abe, G. S. Abrams, I. Adam, K. Adamczyk, A. Adametz, T. Adye, A. Agarwal, H. Ahmed, M. Ahmed, S. Ahmed, B. S. Ahn, H. S. Ahn, I. J. R. Aitchison, K. Akai, S. Akar, M. Akatsu, M. Akemoto, R. Akhmetshin, R. Akre, M. S. Alam, J. N. Albert, R. Aleksan, J. P. Alexander, G. Alimonti, M. T. Allen, J. Allison, T. Allmendinger, J. R. G. Alsmiller, D. Altenburg, K. E. Alwyn, Q. An, J. Anderson, R. Andreassen, D. Andreotti, M. Andreotti, J. C. Andress, C. Angelini, D. Anipko, A. Anjomshoaa, P. L. Anthony, E. A. Antillon, E. Antonioli, K. Aoki, J. F. Arguin, K. Arinstein, K. Arisaka, K. Asai, M. Asai, Y. Asano, D. J. Asgeirsson, D. M. Asner, T. Aso, M. L. Aspinwall, D. Aston, H. Atmacan, B. Aubert, V. Aulchenko, R. Ayad, T. Azemoon, T. Aziz, V. Azzolini, D. E. Azzopardi, M. A. Baak, J. J. Back, S. Bagnasco, S. Bahinipati, D. S. Bailey, S. Bailey, P. Bailly, N. van Bakel, A. M. Bakich, A. Bala, V. Balagura, R. Baldini-Ferroli, Y. Ban, E. Banas, H. R. Band, S. Banerjee, E. Baracchini, R. Barate, E. Barberio, M. Barbero, D. J. Bard, T. Barillari, N. R. Barlow, R. J. Barlow, M. Barrett, W. Bartel, J. Bartelt, R. Bartoldus, G. Batignani, M. Battaglia, J. M. Bauer, A. Bay, M. Beaulieu, P. Bechtle, T. W. Beck, J. Becker, J. Becla, I. Bedny, S. Behari, P. K. Behera, E. Behn, L. Behr, C. Beigbeder, D. Beiline, R. Bell, F. Bellini, G. Bellodi, K. Belous, M. Benayoun, G. Benelli, J. F. Benitez, M. Benkebil, N. Berger, J. Bernabeu, D. Bernard, R. Bernet, F. U. Bernlochner, J. W. Berryhill, K. Bertsche, P. Besson, D. S. Best, S. Bettarini, D. Bettoni, V. Bhardwaj, W. Bhimji, B. Bhuyan, B. Bhuyan, M. E. Biagini, M. Biasini, K. van Bibber, J. Biesiada, I. Bingham, R. M. Bionta, M. Bischofberger, U. Bitenc, I. Bizjak, F. Blanc, G. Blaylock, V. E. Blinov, E. Bloom, P. C. Bloom, N. L. Blount, J. Blouw, M. Bly, S. Blyth, C. T. Boeheim, M. Bomben, A. Bondar, M. Bondioli, G. R. Bonneaud, G. Bonvicini, M. Booke, J. Booth, C. Borean, A. W. Borgland, E. Borsato, F. Bosi, L. Bosisio, A. A. Botov, J. Bougher, K. Bouldin, P. Bourgeois, D. Boutigny, D. A. Bowerman, A. M. Boyarski, R. F. Boyce, J. T. Boyd, A. Bozek, C. Bozzi, M. Bračko, G. Brandenburg, T. Brandt, B. Brau, J. Brau, A. B. Breon, D. Breton, C. Brew, H. Briand, P. G. Bright-Thomas, V. Brigljević, D. I. Britton, F. Brochard, B. Broomer, J. Brose, T. E. Browder, C. L. Brown, C. M. Brown, D. N. Brown, D. N. Brown, M. Browne, M. Bruinsma, S. Brunet, F. Bucci, C. Buchanan, O. L. Buchmueller, C. Bünger, W. Bugg, A. D. Bukin, R. Bula, H. Bulten, P. R. Burchat, W. Burgess, J. P. Burke, J. Button-Shafer, A. R. Buzykaev, A. Buzzo, Y. Cai, R. Calabrese, A. Calcaterra, G. Calderini, B. Camanzi, E. Campagna, C. Campagnari, R. Capra, V. Carassiti, M. Carpinelli, M. Carroll, G. Casarosa, B. C. K. Casey, N. M. Cason, G. Castelli, N. Cavallo, G. Cavoto, A. Cecchi, R. Cenci, G. Cerizza, A. Cervelli, A. Ceseracciu, X. Chai, K. S. Chaisanguanthum, M. C. Chang, Y. H. Chang, Y. W. Chang, D. S. Chao, M. Chao, Y. Chao, E. Charles, C. A. Chavez, R. Cheaib, V. Chekelian, A. Chen, A. Chen, E. Chen, G. P. Chen, H. F. Chen, J. -H. Chen, J. C. Chen, K. F. Chen, P. Chen, S. Chen, W. T. Chen, X. Chen, X. R. Chen, Y. Q. Chen, B. Cheng, B. G. Cheon, N. Chevalier, Y. M. Chia, S. Chidzik, K. Chilikin, M. V. Chistiakova, R. Cizeron, I. S. Cho, K. Cho, V. Chobanova, H. H. F. Choi, K. S. Choi, S. K. Choi, Y. Choi, Y. K. Choi, S. Christ, P. H. Chu, S. Chun, A. Chuvikov, G. Cibinetto, D. Cinabro, A. R. Clark, P. J. Clark, C. K. Clarke, R. Claus, B. Claxton, Z. C. Clifton, J. Cochran, J. Cohen-Tanugi, H. Cohn, T. Colberg, S. Cole, F. Colecchia, C. Condurache, R. Contri, P. Convert, M. R. Convery, P. Cooke, N. Copty, C. M. Cormack, F. Dal Corso, L. A. Corwin, F. Cossutti, D. Cote, A. Cotta Ramusino, W. N. Cottingham, F. Couderc, D. P. Coupal, R. Covarelli, G. Cowan, W. W. Craddock, G. Crane, H. B. Crawley, L. Cremaldi, A. Crescente, M. Cristinziani, J. Crnkovic, G. Crosetti, T. Cuhadar-Donszelmann, A. Cunha, S. Curry, A. D'Orazio, S. Dû, G. Dahlinger, B. Dahmes, C. Dallapiccola, N. Danielson, M. Danilov, A. Das, M. Dash, S. Dasu, M. Datta, F. Daudo, P. D. Dauncey, P. David, C. L. Davis, C. T. Day, F. De Mori, G. De Domenico, N. De Groot, C. De la Vaissière, Ch. de la Vaissière, A. de Lesquen, G. De Nardo, R. de Sangro, A. De Silva, S. DeBarger, F. J. Decker, P. del Amo Sanchez, L. Del Buono, V. Del Gamba, D. del Re, G. Della Ricca, A. G. Denig, D. Derkach, I. M. Derrington, H. DeStaebler, J. Destree, S. Devmal, B. Dey, B. Di Girolamo, E. Di Marco, M. Dickopp, M. O. Dima, S. Dittrich, S. Dittongo, P. Dixon, L. Dneprovsky, F. Dohou, Y. Doi, Z. Doležal, D. A. Doll, M. Donald, L. Dong, L. Y. Dong, J. Dorfan, A. Dorigo, M. P. Dorsten, R. Dowd, J. Dowdell, Z. Drásal, J. Dragic, B. W. Drummond, R. S. Dubitzky, G. P. Dubois-Felsmann, M. S. Dubrovin, Y. C. Duh, Y. T. Duh, D. Dujmic, W. Dungel, W. Dunwoodie, D. Dutta, A. Dvoretskii, N. Dyce, M. Ebert, E. A. Eckhart, S. Ecklund, R. Eckmann, P. Eckstein, C. L. Edgar, A. J. Edwards, U. Egede, A. M. Eichenbaum, P. Elmer, S. Emery, Y. Enari, R. Enomoto, E. Erdos, R. Erickson, J. A. Ernst, R. J. Erwin, M. Escalier, V. Eschenburg, I. Eschrich, S. Esen, L. Esteve, F. Evangelisti, C. W. Everton, V. Eyges, C. Fabby, F. Fabozzi, S. Fahey, M. Falbo, S. Fan, F. Fang, F. Fang, C. Fanin, A. Farbin, H. Farhat, J. E. Fast, M. Feindt, A. Fella, E. Feltresi, T. Ferber, R. E. Fernholz, S. Ferrag, F. Ferrarotto, F. Ferroni, R. C. Field, A. Filippi, G. Finocchiaro, E. Fioravanti, J. Firmino da Costa, P. -A. Fischer, A. Fisher, P. H. Fisher, C. J. Flacco, R. L. Flack, H. U. Flaecher, J. Flanagan, J. M. Flanigan, K. E. Ford, W. T. Ford, I. J. Forster, A. C. Forti, F. Forti, D. Fortin, B. Foster, S. D. Foulkes, G. Fouque, J. Fox, P. Franchini, M. Franco Sevilla, B. Franek, E. D. Frank, K. B. Fransham, S. Fratina, K. Fratini, A. Frey, R. Frey, M. Friedl, M. Fritsch, J. R. Fry, H. Fujii, M. Fujikawa, Y. Fujita, Y. Fujiyama, C. Fukunaga, M. Fukushima, J. Fullwood, Y. Funahashi, Y. Funakoshi, F. Furano, M. Furman, K. Furukawa, H. Futterschneider, E. Gabathuler, T. A. Gabriel, N. Gabyshev, F. Gaede, N. Gagliardi, A. Gaidot, J. -M. Gaillard, J. R. Gaillard, S. Galagedera, F. Galeazzi, F. Gallo, D. Gamba, R. Gamet, K. K. Gan, P. Gandini, S. Ganguly, S. F. Ganzhur, Y. Y. Gao, I. Gaponenko, A. Garmash, J. Garra Tico, I. Garzia, M. Gaspero, F. Gastaldi, C. Gatto, V. Gaur, N. I. Geddes, T. L. Geld, J. -F. Genat, K. A. George, M. George, S. George, Z. Georgette, T. J. Gershon, M. S. Gill, R. Gillard, J. D. Gilman, F. Giordano, M. A. Giorgi, P. -F. Giraud, L. Gladney, T. Glanzman, R. Glattauer, A. Go, K. Goetzen, Y. M. Goh, G. Gokhroo, P. Goldenzweig, V. B. Golubev, G. P. Gopal, A. Gordon, A. Gorišek, V. I. Goriletsky, R. Gorodeisky, L. Gosset, K. Gotow, S. J. Gowdy, P. Graffin, S. Grancagnolo, E. Grauges, G. Graziani, M. G. Green, M. G. Greene, G. J. Grenier, P. Grenier, K. Griessinger, A. A. Grillo, B. V. Grinyov, A. V. Gritsan, G. Grosdidier, M. Grosse Perdekamp, P. Grosso, M. Grothe, Y. Groysman, O. Grünberg, E. Guido, H. Guler, N. J. W. Gunawardane, Q. H. Guo, R. S. Guo, Z. J. Guo, N. Guttman, H. Ha, H. C. Ha, T. Haas, J. Haba, J. Hachtel, H. K. Hadavand, T. Hadig, C. Hagner, M. Haire, F. Haitani, T. Haji, G. Haller, V. Halyo, K. Hamano, H. Hamasaki, G. Hamel de Monchenault, J. Hamilton, R. Hamilton, O. Hamon, B. Y. Han, Y. L. Han, H. Hanada, K. Hanagaki, F. Handa, J. E. Hanson, A. Hanushevsky, K. Hara, T. Hara, Y. Harada, P. F. Harrison, T. J. Harrison, B. Harrop, A. J. Hart, P. A. Hart, B. L. Hartfiel, J. L. Harton, T. Haruyama, A. Hasan, Y. Hasegawa, C. Hast, N. C. Hastings, K. Hasuko, A. Hauke, C. M. Hawkes, K. Hayashi, M. Hazumi, C. Hee, E. M. Heenan, D. Heffernan, T. Held, R. Henderson, S. W. Henderson, S. S. Hertzbach, S. Hervé, M. Heß, C. A. Heusch, A. Hicheur, Y. Higashi, Y. Higasino, I. Higuchi, S. Hikita, E. J. Hill, T. Himel, L. Hinz, T. Hirai, H. Hirano, J. F. Hirschauer, D. G. Hitlin, N. Hitomi, M. C. Hodgkinson, A. Höcker, C. T. Hoi, T. Hojo, T. Hokuue, J. J. Hollar, T. M. Hong, K. Honscheid, B. Hooberman, D. A. Hopkins, Y. Horii, Y. Hoshi, K. Hoshina, S. Hou, W. S. Hou, T. Hryn'ova, Y. B. Hsiung, C. L. Hsu, S. C. Hsu, H. Hu, T. Hu, H. C. Huang, T. J. Huang, Y. C. Huang, Z. Huard, M. E. Huffer, D. Hufnagel, T. Hung, D. E. Hutchcroft, H. J. Hyun, S. Ichizawa, T. Igaki, A. Igarashi, S. Igarashi, Y. Igarashi, O. Igonkina, K. Ikado, H. Ikeda, H. Ikeda, K. Ikeda, J. Ilic, K. Inami, W. R. Innes, Y. Inoue, A. Ishikawa, A. Ishikawa, H. Ishino, K. Itagaki, S. Itami, K. Itoh, V. N. Ivanchenko, R. Iverson, M. Iwabuchi, G. Iwai, M. Iwai, S. Iwaida, M. Iwamoto, H. Iwasaki, M. Iwasaki, M. Iwasaki, T. Iwashita, J. M. Izen, D. J. Jackson, F. Jackson, G. Jackson, P. S. Jackson, R. G. Jacobsen, C. Jacoby, I. 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This work is on the Physics of the B Factories. Part A of this book contains a brief description of the SLAC and KEK B Factories as well as their detectors, BaBar and Belle, and data taking related issues. Part B discusses tools and methods used by the experiments in order to obtain results. Read More

Within the confined isospin- and density-dependent mass model, we study the properties of strange quark matter (SQM) and quark stars (QSs) under strong magnetic fields. The equation of state of SQM under a constant magnetic field is obtained self-consistently and the pressure perpendicular to the magnetic field is shown to be larger than that parallel to the magnetic field, implying that the properties of magnetized QSs generally depend on both the strength and the orientation of the magnetic fields distributed inside the stars. Using a density-dependent magnetic field profile which is introduced to mimic the magnetic field strength distribution in a star, we study the properties of static spherical QSs by assuming two extreme cases for the magnetic field orientation in the stars, i. Read More

Superconductivity in a novel class of layered materials, Ti-based pnictide oxides, was recently discovered. These compounds have attracted interest since they combine features of copper oxide and iron pnictide superconductors. Here the transition metal (titanium) forms two-dimensional Ti$_2$O layers (anti structure to the CuO$_2$ planes), capped by pnictogen ions (similar to Fe$_2$As$_2$ layers). Read More

We proposed to use polarized neutrons scattering from a hyperpolarized 131Xe gaseous target in order to measure time-reversal violation effect in baryon processes with nucleons. This article provides a brief introduction, historical review, and possible methods to construct a hyperpolarized 131Xe gaseous target. Read More

Effects of circulating energetic ions (CEIs) on the geodesic acoustic modes (GAMs) in toroidally rotating tokamaks are theoretically analyzed utilizing the hybrid kinetic-fluid model. The frequencies of GAMs in the presence of toroidal rotation and CEIs are derived by first considering the rigid equilibrium condition. The unperturbed distribution function of CEIs depends on the poloidal angle, eventually influencing the frequencies significantly. Read More

We report the results of low-temperature heat capacity measurements of the pnictide oxide superconductor BaTi$_2$Sb$_2$O doped with sodium. The temperature and field dependent heat capacity data are well described by a single-gap BCS theory. The estimated values for the normal state Sommerfeld constant, the heat capacity jump at $T_c$, and the electron-phonon coupling constant are in favor of a conventional weak coupling superconductivity mediated by electron-phonon interaction. Read More

We present a high precision frequency determination method for digitized NMR FID signals. The method employs high precision numerical integration rather than simple summation as in many other techniques. With no independent knowledge of the other parameters of a NMR FID signal (phase $\phi$, amplitude $A$, and transverse relaxation time $T_{2}$) this method can determine the signal frequency $f_{0}$ with a precision of $1/(8\pi^{2}f_{0}^{2}T_{2}^{2})$ if the observation time $T$ is long enough. Read More

The recently discovered inverse magnetic catalysis around the critical temperature indicates that some important information is missing in our current understanding of conventional chiral dynamics of QCD, which is enhanced by the magnetic field. In this work, we provide a mechanism to explain that the inverse magnetic catalysis around the critical temperature is induced by sphalerons. At high temperatures, sphaleron transitions between distinct classical vacua cause an asymmetry between the number of right- and left-handed quarks due to the axial anomaly of QCD. Read More

Pressure dependence of longitudinal relaxation time (T$_1$) due to the cell wall was observed previously at both room temperature and low temperature in valved Rb-coated refillable $^3$He gaseous cells in \cite{Zheng2}. The diffusion of $^3$He from measurement cell through a capillary tube to the valve and the subsequent depolarization on the surface of the valve was proposed to possibly explain such a pressure dependence at room temperature \cite{Saam}. In this paper, we investigate this diffusion effect through measurements of T$_1$ with newly designed Rb-coated Pyrex glass cells at 295 K as well as finite element analysis (FEA) studies. Read More

We extend the confined-density-dependent-mass (CDDM) model to include isospin dependence of the equivalent quark mass. Within the confined-isospin-density-dependent-mass (CIDDM) model, we study the quark matter symmetry energy, the stability of strange quark matter, and the properties of quark stars. We find that including isospin dependence of the equivalent quark mass can significantly influence the quark matter symmetry energy as well as the properties of strange quark matter and quark stars. Read More

The possible existence of short-range forces between unpolarized and polarized spin-1/2 particles has attracted the attention of physicists for decades. These forces are predicted in various theories and provide a possible new source for parity (P) and time reversal (T) symmetry violation. We use an ensemble of polarized 3He gas in a cell with a 250 um thickness glass window to search for a force from scalar boson exchange over a sub-millimeter ranges. Read More

We report a measurement of the modification of the effective precession frequency of polarized 3He atoms in response to a dressing field in a room temperature cell. The 3He atoms were polarized using the metastability spin-exchange method. An oscillating dressing field is then applied perpendicular to the constant magnetic field. Read More

The effect of hydrostatic pressure on the superconductivity in LiFeAs is investigated up to 1.8 GPa. The superconducting transition temperature, T_c, decreases linearly with pressure at a rate of 1. Read More

The synthesis and properties of LiFeAs, a high-Tc Fe-based superconducting stoichiometric compound, are reported. Single crystal x-ray studies reveal that it crystallizes in the tetragonal PbFCl type (P4/nmm) with a=3.7914(7) A and c=6. Read More

We examine collisions of moving solitons in a fiber Bragg grating with a triplet composed of two closely set repulsive defects of the grating and an attractive one inserted between them. A doublet (dipole), consisting of attractive and repulsive defects with a small distance between them,is considered too. Systematic simulations demonstrate that the triplet provides for superior results, as concerns the capture of a free pulse and creation of a standing optical soliton, in comparison with recently studied traps formed by single and paired defects, as well as the doublet: 2/3 of the energy of the incident soliton can be captured when its velocity attains half the light speed in the fiber (the case most relevant to the experiment), and the captured soliton quickly relaxes to a stationary state. Read More

We develop the theory of Brillouin light scattering (BLS) from spin wave modes in ferromagnetic nanospheres, within a framework that incorporates the spatial variation of the optical fields within the sphere. Our recent theory of exchange dipole spin wave modes of the sphere provides us with eigenvectors. When properly normalized, these eigenvectors allow calculation of the absolute cross section of various modes which contribute to BLS spectrum. Read More

We consider dynamics of spatial beams in a dual-channel waveguide with competing cubic and quintic (CQ) nonlinearities. Gradually increasing the power in the input channel, we identify four different regimes of the pulses coupling into the cross channel, which alternate three times between full pass and full stop, thus suggesting three realizations of switching between the channels. As in the case of the Kerr (solely cubic) nonlinearity, the first two regimes are the linear one, and one dominated by the self-focusing nonlinearity, with the beam which, respectively, periodically couples between the channels, or stays in the input channel. Read More

We report results of a systematic study of one-dimensional four-wave moving solitons in a recently proposed model of the Bragg cross-grating in planar optical waveguides with the Kerr nonlinearity; the same model applies to a fiber Bragg grating (BG) carrying two polarizations of light. We concentrate on the case when the system's spectrum contains no true bandgap, but only semi-gaps (which are gaps only with respect to one branch of the dispersion relation), that nevertheless support soliton families. Solely zero-velocity solitons were previously studied in this system, while current experiments cannot generate solitons with the velocity smaller than half the maximum group velocity. Read More

2004May
Affiliations: 1Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong;, 2Department of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel, 3Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong;

We study the motion of gap solitons in two models of apodized nonlinear fiber Bragg gratings (BGs), with the local reflectivity (LR) varying along the fiber. A single step of LR, and a periodic array of alternating steps with opposite signs (a "Bragg superstructure") are considered. A challenging possibility is to slow down and eventually halt the soliton by passing it through the step of increasing reflectivity, thus capturing a pulse of standing light. Read More

Results of a systematic theoretical study of collisions between moving solitons in a fiber grating are presented. Various outcomes of the collision are identified, the most interesting one being merger of the solitons into a single zero-velocity pulse, which suggests a way to create pulses of ``standing light". The merger occurs with the solitons whose energy takes values between 0. Read More

2002Dec
Affiliations: 1Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, 2Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, 3Department of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel

We study the interactions of a Bragg-grating soliton with a localized attractive defect which is a combined perturbation of the grating and refractive index. A family of exact analytical solutions for solitons trapped by the delta-like defect is found. Direct simulations demonstrate that, up to the numerical accuracy available, the trapped soliton is stable at a single value of its intrinsic parameter ("mass"). Read More

2002Dec
Affiliations: 1Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong, Hong Kong, 2Optoelectronic Research Centre, Department of Electronic Engineering, City University of Hong Kong, Hong Kong, 3Department of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel

A model of a lossy nonlinear fiber grating with a "hot spot", which combines a local gain and an attractive perturbation of the refractive index, is introduced. A family of exact solutions for pinned solitons is found in the absence of loss and gain. In the presence of the loss and localized gain, an instability threshold of the zero solution is found. Read More

2000Dec
Affiliations: 1Dept. of Interdisciplinary Studies, Faculty of Engineering, Tel Aviv University, Tel Aviv, Israel, 2Optical Communications Group, School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, Australia, 3Optical Communications Group, School of Electrical Engineering and Telecommunications, University of New South Wales, Sydney, Australia

We consider solitons in a nonlinear optical fiber with a single polarization in a region of parameters where it carries exactly two distinct modes, the fundamental one and the first-order helical mode. From the viewpoint of applications to dense-WDM communication systems, this opens way to double the number of channels carried by the fiber. Aside from that, experimental observation of helical (spinning) solitons and collisions between them and with fundamental solitons are issues of fundamental interest. Read More