R. Julin - University of Jyvaskyla, Finland

R. Julin
Are you R. Julin?

Claim your profile, edit publications, add additional information:

Contact Details

Name
R. Julin
Affiliation
University of Jyvaskyla, Finland
City
Jyväskylän yliopisto
Country
Finland

Pubs By Year

Pub Categories

 
Nuclear Experiment (13)
 
Nuclear Theory (3)
 
Solar and Stellar Astrophysics (1)
 
Physics - Instrumentation and Detectors (1)

Publications Authored By R. Julin

The quenching of the experimental spectroscopic factor for proton emission from the short-lived $d_{3/2}$ isomeric state in $^{151m}$Lu was a long-standing problem. In the present work, proton emission from this isomer has been reinvestigated in an experiment at the Accelerator Laboratory of the University of Jyv\"{a}skyl\"{a}. The proton-decay energy and half-life of this isomer were measured to be 1295(5) keV and 15. Read More

Electron capture on $^{20}$Ne is thought to play a crucial role in the final evolution of electron-degenerate ONe stellar cores. Recent calculations suggest that the capture process is dominated by the second-forbidden transition between the ground states of $^{20}$Ne and $^{20}$F, making an experimental determination of this transition strength highly desirable. To accomplish this task we are refurbishing an intermediate-image magnetic spectrometer capable of focusing 7 MeV electrons, and designing a scintillator detector surrounded by an active cosmic-ray veto shield, which will serve as an energy-dispersive device at the focal plane. Read More

The neutron-deficient mercury isotopes, $^{184,186}$Hg, were studied with the Recoil Distance Doppler Shift (RDDS) method using the Gammasphere array and the K\"oln Plunger device. The Differential Decay Curve Method (DDCM) was employed to determine the lifetimes of the yrast states in $^{184,186}$Hg. An improvement on previously measured values of yrast states up to $8^{+}$ is presented as well as first values for the $9_{3}$ state in $^{184}$Hg and $10^{+}$ state in $^{186}$Hg. Read More

The $^{208}$Pb($p$,$n\gamma\bar p$) $^{207}$Pb reaction at a beam energy of 30 MeV has been used to excite the anti-analog of the giant dipole resonance (AGDR) and to measure its $\gamma$-decay to the isobaric analog state in coincidence with proton decay of IAS. The energy of the transition has also been calculated with the self-consistent relativistic random-phase approximation (RRPA), and found to be linearly correlated to the predicted value of the neutron-skin thickness ($\Delta R_{pn}$). By comparing the theoretical results with the measured transition energy, the value of 0. Read More

Candidates for three excited states in the 66^Se have been identified using the recoil-{\beta} tagging method together with a veto detector for charged-particle evaporation channels. These results allow a comparison of mirror and triplet energy differences between analogue states across the A = 66 triplet as a function of angular momentum. The extracted triplet energy differences follow the negative trend observed in the f_7/2 shell. Read More

Linear polarization measurements have been performed for $\gamma$-rays in $^{91}$Ru produced with the $^{58}$Ni($^{36}$Ar, $2p1n$$\gamma$)$^{91}$Ru reaction at a beam energy of 111 MeV. The EXOGAM Ge clover array has been used to measure the $\gamma$-$\gamma$ coincidences, $\gamma$-ray linear polarization and $\gamma$-ray angular distributions. The polarization sensitivity of the EXOGAM clover detectors acting as Compton polarimeters has been determined in the energy range 0. Read More

The a-decay chains originating from the s1/2 and h11/2 states in 173Au have been investigated following fusion-evaporation reactions. Four generations of a radioactivities have been correlated with 173Aum leading to a measurement of the a decay of 161Tam. It has been found that the known a decay of 161Ta, which was previously associated with the decay of the ground state, is in fact the decay of an isomeric state. Read More

The neutron-deficient nucleus 173Hg has been studied following fusion-evaporation reactions. The observation of gamma rays decaying from excited states are reported for the first time and a tentative level scheme is proposed. The proposed level scheme is discussed within the context of the systematics of neighbouring neutron-deficient Hg nuclei. Read More

The general phenomenon of shell structure in atomic nuclei has been understood since the pioneering work of Goeppert-Mayer, Haxel, Jensen and Suess.They realized that the experimental evidence for nuclear magic numbers could be explained by introducing a strong spin-orbit interaction in the nuclear shell model potential. However, our detailed knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. Read More

A discussion on the nature of the 0+ states in 68Ni (Z=28, N=40) is presented and a comparison is made with its valence counterpart 90Zr (Z=40, N=50). Evidence is given for a 0+ proton intruder state at only ~2.2 MeV excitation energy in 68Ni, while the analogous neutron intruder states in 90Zr reside at 4126 keV and 5441 keV. Read More

2010Mar
Affiliations: 1University of Jyvaskyla, Finland, 2University of York, U.K, 3University of Liverpool, U.K, 4University of Liverpool, U.K, 5University of Jyvaskyla, Finland, 6University of Jyvaskyla, Finland, 7University of Jyvaskyla, Finland, 8University of Jyvaskyla, Finland, 9University of Jyvaskyla, Finland, 10University of Jyvaskyla, Finland, 11University of Jyvaskyla, Finland, 12University of Jyvaskyla, Finland, 13University of Jyvaskyla, Finland, 14University of Jyvaskyla, Finland, 15University of Liverpool, U.K, 16University of Liverpool, U.K, 17University of Liverpool, U.K, 18University of Jyvaskyla, Finland, 19University of York, U.K, 20University of Jyvaskyla, Finland, 21University of Jyvaskyla, Finland, 22University of Jyvaskyla, Finland, 23University of Jyvaskyla, Finland, 24University of Jyvaskyla, Finland, 25University of York, U.K, 26University of Jyvaskyla, Finland, 27University of York, U.K, 28Universite Bordeaux/CNRS/IN2P3, France, 29Universite Libre de Bruxelles, Belgium

Excited states in the extremely neutron-deficient nucleus, 180Pb, have been identified for the first time using the JUROGAM II array in conjunction with the RITU recoil separator at the Accelerator Laboratory of the University of Jyvaskyla. This study lies at the limit of what is presently achievable with in-beam spectroscopy, with an estimated cross-section of only 10 nb for the 92Mo(90Zr,2n)180Pb reaction. A continuation of the trend observed in 182Pb and 184Pb is seen, where the prolate minimum continues to rise beyond the N=104 mid-shell with respect to the spherical ground state. Read More

High-spin states in the neutron deficient nucleus $^{107}$In were studied via the $^{58}$Ni($^{52}$Cr, 3p) reaction. In-beam $\gamma$ rays were measured using the JUROGAM detector array. A rotational cascade consisting of ten $\gamma$-ray transitions which decays to the 19/2$^{+}$ level at 2. Read More

2008Nov
Affiliations: 1IPNL, 2DRS-IPHC, 3IPNL, 4DRS-IPHC, 5Niewodniczanski Institute of Nuclear Physics, 6Maria Curie-Sklodowska Univ., 7DRS-IPHC, 8DRS-IPHC, 9DRS-IPHC, 10DRS-IPHC, 11DRS-IPHC, 12DRS-IPHC, 13IPNL, 14IPNL, 15IPNL, 16University of Jyvaskyl, 17University of Jyvaskyl, 18University of Jyvaskyl, 19University of Jyvaskyl, 20University of Jyvaskyl, 21University of Jyvaskyl, 22Niewodniczanski Institute of Nuclear Physics, 23Niewodniczanski Institute of Nuclear Physics, 24Niewodniczanski Institute of Nuclear Physics, 25Physics Division, ORNL, 26University of Jyvaskyl, Warsaw Univ., 27CSNSM, 28CSNSM, 29IPNO, 30LNL, 31GSI

Theoretical predictions suggest the presence of tetrahedral symmetry as an explanation for the vanishing intra-band E2-transitions at the bottom of the odd-spin negative parity band in $^{156}Gd$. The present study reports on experiment performed to address this phenomenon. It allowed to determine the intra-band E2 transitions and branching ratios B(E2)/B(E1) of two of the negative-parity bands in $^{156}Gd$. Read More

The technique of recoil beta tagging has been developed which allows prompt gamma decays in nuclei from excited states to be correlated with electrons from their subsequent short-lived beta decay. This technique is ideal for studying nuclei very far from stability and improves in sensitivity for very short-lived decays and for high decay Q-values. The method has allowed excited states in 78Y to be observed for the first time, as well as an extension in the knowledge of T=1 states in 74Rb. Read More