M. Nyman - University of Jyvaskyla, Finland

M. Nyman
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M. Nyman
University of Jyvaskyla, Finland

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Nuclear Experiment (5)
Nuclear Theory (1)

Publications Authored By M. Nyman

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

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

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