Year: 2018
Type: article
Abstract: High spin band structures of neutron-rich $^{152--158}\mathrm{Pm}$ isotopes have been obtained from the measurement of prompt $\ensuremath{\gamma}$ rays of isotopically identified fragments produced in fission of $^{238}\mathrm{U}+^{9}\mathrm{Be}$ and detected using the VAMOS++ magnetic spectrometer and EXOGAM segmented Clover array at GANIL and also from the high statistics $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}$ data from the spontaneous fission of $^{252}\mathrm{Cf}$ using Gammasphere. The excited states in $^{157}\mathrm{Pm}$ and those above the isomers in even-$A$ Pm isotopes $^{152,154,156,158}\mathrm{Pm}$ have been identified for the first time. The spectroscopic information on the rotational band structures in odd-$A$ Pm isotopes has been extended considerably to higher spins and the possibility of the presence of reflection asymmetric shapes is explored. The configuration assignments are based on the results of cranked relativistic Hartree-Bogoliubov calculations. From the systematics of bands in odd-$A$ Pm isotopes and weak population of opposite parity bands, octupole deformed shapes in neutron-rich Pm isotopes beyond $N=90$ seem unlikely to be present.
Source: Physical Review C
Authors: S. Bhattacharyya, E. H. Wang, A. Navin, M. Rejmund, J. H. Hamilton, A. V. Ramayya, J. K. Hwang, A. Lemasson, A. V. Afanasjev, Soumik Bhattacharya, J. Ranger, M. Caamaño, E. Clément, O. Delaune, F. Farget, G. de France, B. Jacquot, Y. X. Luo, Yu. Ts. Oganessian, J. O. Rasmussen, G. M. Ter-Akopian, S. J. Zhu
Institutions: Variable Energy Cyclotron Centre, Homi Bhabha National Institute, Vanderbilt University, Centre National de la Recherche Scientifique, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Institut National de Physique Nucléaire et de Physique des Particules, Grand Accélérateur National d'Ions Lourds, Mississippi State University, Universidade de Santiago de Compostela, Lawrence Berkeley National Laboratory, Joint Institute for Nuclear Research, Tsinghua University
Language: Latvian
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2897870203