Collective bands in 104,106,108Mo |
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| Authors: | E F Jones P M Gore S J Zhu J H Hamilton A V Ramayya J K Hwang R Q Xu L M Yang K Li Z Jiang Z Zhang S D Xiao X Q Zhang W C Ma J D Cole M W Drigert I Y Lee J O Rasmussen Y X Luo M A Stoyer |
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| Institution: | (1) Department of Physics, Vanderbilt University, Nashville, USA;(2) Department of Physics, Tsinghua University, Beijing, China;(3) Department of Physics, Mississippi State University, USA;(4) Idaho National Engineering and Environmental Laboratory, Idaho Falls, USA;(5) Lawrence Berkeley National Laboratory, Berkeley, USA;(6) Lawrence Livermore National Laboratory, Livermore, USA;(7) Joint Institute for Heavy Ion Research, Oak Ridge, USA |
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| Abstract: | We have used our analysis of γ-γ-γ data (5.7 × 1011 triples and higher folds) taken with Gammasphere from prompt γ rays emitted in the spontaneous fission of 252Cf to study the collective bands in 104,106,108Mo. The one-phonon and two-phonon γ-vibrational bands and known two-quasiparticle bands in neutron-rich 104,106Mo were extended to higher spins. The one-and two-phonon γ-vibrational bands have remarkably close energies for transitions from the same spin states and identical moments of inertia.
Several new bands are observed and are proposed as quasiparticle bands in 104,106Mo, along with the first β-type vibrational band in 106Mo. The quasiparticle bands have essentially constant moments of inertia near the rigid-body value that indicate blocking
of the pairing interaction. Candidates for chiral doublet bands in 106Mo are strong. These are the first reported chiral vibrational bands in an even-even nucleus.
The text was submitted by the authors in English. |
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