Year: 2012
Type: article
Abstract: The neutron-rich nuclei ${}^{109}$Pd and ${}^{111}$Pd were produced as fission fragments following the ${}^{30}\mathrm{Si}+{}^{168}\mathrm{Er}$ reaction at 142 MeV. Using the identification based on the coincidences with the complementary fission fragments, the only positive-parity bands observed so far in ${}^{109}$Pd and ${}^{111}$Pd emerged from this work. A band, built on top of the 5/2${}^{+}$ ground state exhibiting $\ensuremath{\Delta}I=1$ energy-level staggering, was observed in each of these nuclei. Both nuclei of interest, ${}^{109}$Pd and ${}^{111}$Pd, are suggested to lie in the transitional region of Pd isotopes of maximum $\ensuremath{\gamma}$ softness. The ground states of both nuclei are predicted by total Routhian surface calculations to be extremely $\ensuremath{\gamma}$ soft with shallow triaxial minima. The first crossing in the new bands is proposed to be attributable to an alignment of ${h}_{11/2}^{2}$ neutrons.
Source: Physical Review C
Institutions: Bulgarian Academy of Sciences, Institute for Nuclear Research and Nuclear Energy, Sofia University "St. Kliment Ohridski", Centre National de la Recherche Scientifique, Institut National de Physique Nucléaire et de Physique des Particules, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse, Peking University, Istituto Nazionale di Fisica Nucleare, Sezione di Padova, University of Copenhagen, University of Bonn, Argonne National Laboratory, Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2000267691