Evidence for a highly deformed oblate0+state in3674Kr

Shape coexistence and evolution in neutron-deficient krypton isotopes

“…1 [34] before evaluation [35]. Adopting this value and β 2 ∼ 0.32 for the 0 + 2 state of 74 Kr, the observed monopole strength ρ 2 (E0) could be well reproduced [7]. This lends extra support to our calculations.…”

“…As is outlined in the Introduction, for neutrondeficient krypton isotopes, experimental data concerning shape coexistence and evolution have been accumulating for the last three decades [2][3][4][5][7][8][9][10][11]. In particular, a quadrupole deformation of |β 2 | = 0.330 (21) [11].…”

“…For krypton, a candidate for such bands was early proposed in 76 Kr [2,3]. In addition, a highly-deformed isomeric 0 + state in 74 Kr was first hypothesized to explain the substantially "prolonged" lifetime of the yrast 2 + state [7], and was soon corroborated by means of combined conversion-electron and γ-ray spectroscopy [8]. Taking advantage of the same experimental technique, a low-lying isomeric 0 + state was later also established in 72 Kr [9], extending shape coexistence to the N = Z line.…”

B(GT)strength fromβ-decay measurements and inferred shape mixing inKrPoirier1, Maréchal2, Dessagne3 et al. 2004Phys. Rev. CSelf Cite662380View full textAdd to dashboardCite

“…Furthermore, shape coexistence can occur when neutron and proton shell gaps drive the nucleus towards opposite deformations [3,4]. A typical candidate for such behavior is the neutron-deficient 74 Kr isotope which has recently been the subject of several in-beam investigations [5,6]. From these studies, possible shape coexistence in this nucleus was inferred from the measurement of the electric-monopole (E0) transition linking the 0 1 + ground state to a second 0 2 + isomeric state.…”

Projected shell model study for the yrast-band structure of the proton-rich mass-80 nuclei

“…For example, some extensive measurements [1][2][3][4][5][6][7][8][9][10] of the transition quadrupole-moments, extracted from the level lifetimes and excitation energy of 2 + state, have been carried out for Kr-, Sr-and Zr-isotopes. These measurements have revealed large variations in nuclear structure of these isotopes with respect to particle number and angular momentum.…”