Lifetimes and structure of74Se excited states

Abstract

74Se excited states were studied via the (12C, p2n) and (c~, 3n) reactions. Mean lifetimes of 19 levels of 74Se were determined using DSA and recoil-distance Doppler shift technique. The experimental results are compared with the calculations according to the IBA and nonlinear vibration models. For the major part of data reasonable agreement has been achieved in the description of the level energies and the probabilities of quadrupole and dipole transitions for positive as well as negative parity states.

Shape coexistence and high-Kstates in74Se populated following theβdecay ofMcCutchan1, Lister2, Ahn3 et al. 2013Phys. Rev. C10071View full textAdd to dashboardCite

“…Initial studies [10,11] proposed the ground state to be a spherical structure coexisting with a deformed rotational band built on the low-lying first excited 0 + state. Both Adam et al, [12] and Radhi and Stewart [13] calculated 74 Se in the framework of the Interacting Boson Model (IBM) and found they could reproduce the experimental spectrum using just a vibrational-like structure with no need to introduce a shape coexistence interpretation. Similarly, 74 Se and its neighbors have been successfully described by the supersymmetry scheme in the vibrational limit [14].…”

Indications of octupole correlation in 84Sr

“…Thus, the enhanced B(E1) transition rates further establish the existence of a strong octupole correlation in addition to the large B(E3) transition rate. In the mass, A ≈ 80 region, the nuclei such as 72 Ge [7], 74 Se [8], 76 Kr [9], 80 Kr [10] and 82 Kr [11] were reported to have strong connecting E1 transitions between negative and positive parity bands. Recently, evidence of octupole correlations was reported in the 72 Se [12], 73,78 Br [13,14] and 79 Se [15] nuclei.…”