Year: 2010
Type: article
Abstract: The lightest xenon isotopes are studied in the shell model framework, within a valence space that comprises all the orbits lying between the magic closures $N=Z=50$ and $N=Z=82$. The calculations produce collective deformed structures of triaxial nature that encompass nicely the known experimental data. Predictions are made for the (still unknown) $N=Z$ nucleus $^{108}\mathrm{Xe}$. The results are interpreted in terms of the competition between the quadrupole correlations enhanced by the pseudo-SU(3) structure of the positive parity orbits and the pairing correlations brought in by the $0{h}_{11/2}$ orbit. We also have studied the effect of the excitations from the $^{100}\mathrm{Sn}$ core on our predictions. We show that the backbending in this region is due to the alignment of two particles in the $0{h}_{11/2}$ orbit. In the $N=Z$ case, one neutron and one proton align to $J=11$ and $T=0$. In $^{110,112}\mathrm{Xe}$ the alignment begins in the $J=10$, $T=1$ channel and it is dominantly of neutron-neutron type. Approaching the band termination the alignment of a neutron-proton pair to $J=11$ and $T=0$ takes over. In a more academic mood, we have studied the role of the isovector and isoscalar pairing correlations on the structure on the yrast bands of $^{108,110}\mathrm{Xe}$ and examined the possible existence of isovector and isoscalar pairing condensates in these $N~Z$ nuclei.
Source: Physical Review C
Authors: E. Caurier, F. Nowacki, A. Poves, K. Sieja
Institutions: Centre National de la Recherche Scientifique, Institut Pluridisciplinaire Hubert Curien, Institut National de Physique Nucléaire et de Physique des Particules, Consejo Superior de Investigaciones Científicas, Instituto de Física Teórica, Universidad Autónoma de Madrid, Université de Strasbourg
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2240919753