Shape coexistence in the neutron-deficient isotope
نویسندگان
چکیده
Neutron-deficient nuclei near the Z=82 closed shell exhibit the phenomenon of shape coexistence where the nucleus can take on oblate, prolate, and even spherical shapes at around the same excitation energy. The single-proton excitations in 187 Tl (with Z=81) can be used as a probe into the microscopic mechanisms behind this phenomenon. Previous studies of 187 Tl deduced the presence of coexisting prolate and oblate shapes from characteristic level structures [1, 2], and these shapes were also assigned from direct quadrupole moment measurements [3]. Long-lived states with microsecond lifetimes were also observed in 187 Tl [4], but their microscopic origin was uncertain.
منابع مشابه
Structural Changes of Hot Rotating Neutron Deficient Doubly Magic Nucleus sn
This paper presents results of statistical calculations of single-particle characteristics of nuclei, excitation energies and shape transition in the Sn isotope with neutron number 50, which is the extremely neutron deficient isotope. It is a very rare and unstable isotope which does not occur in nature, but only on the surface of exploding stars for less than a second. The spherical nucleus at...
متن کاملShape coexistence and charge radii in the lead region studied by in-source laser spectroscopy at RILIS-ISOLDE
The competition between spherical and deformed configurations gives rise to shape coexistence in the neutron-deficient isotopes around Z~82 and N~104 [1] while on the neutron-rich side, effects due to octupole deformation in the vicinity of N~133 could be expected [2]. In order to determine to which extent the ground and isomeric states of these nuclides are affected by these phenomena, an exte...
متن کاملShape coexistence in neutron-deficient Kr isotopes: Constraints on the single-particle spectrum of self-consistent mean-field models from collective excitations
M. Bender, 2, 3 P. Bonche, ∗ and P.-H. Heenen Service de Physique Nucléaire Théorique, Université Libre de Bruxelles, Case Postale 229, B-1050 Bruxelles, Belgium National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI 48824 CEA-Saclay DSM/DAPNIA/SPhN, F-91191 Gif sur Yvette, France Service de Physique Théorique, CEA Saclay, F-91191 Gif sur Yvette Cedex, France...
متن کاملSuperheavy nuclei with the vector self-coupling of the ω-meson in the relativistic mean-field theory
We have studied properties and shell structure of the superheavy elements from Z = 102 to Z = 120 within the framework of the RMF theory. The region of study spans nuclides with neutron numbers N = 150 − 190. The Lagrangian model NL-SV1 with the inclusion of the vector self-coupling of the ω-meson has been employed in this work. We have performed RMF + BCS calculations for an axially deformed c...
متن کاملThe geometry and phase transition behavior of configuration mixing in the interacting boson model
In the last 20 years there has been much interest in the study of nuclear coexistence phenomena, understood as the possibility of a simultaneous excitation of nuclear configurations which may lead to shape phase transitions [1]. The structural changes in the properties of physical systems are called phase transitions. These changes have long been studied in systems such as water in its gaseous,...
متن کامل