Nuclear structure features in ^72-80Se isotopes

Abstract

Interacting boson model (IBM – 1 and IBM – 2) have been used to perform a whole studying for 34 72 − 80 S e isotopes. The low lying positive party states, dynamic symmetries, mixed symmetry states MSS, reducing electric quadruple transition probabilities B(E2), branching ratio, quadruple momentum Q 2 1 + , reducing magnetic dipole transition probability B(M1), mixing ratio δ(E2/M1), reducing electric monopole transition probability B(E0), and X(E0/E2) ratio have been investigated. U(5) features are the dominant in 34 72 − 80 S e with addition of a 2 small effect of parameter started from 34 74 S e to 34 80 S e isotopes, energy ratios show that 34 72 S e isotopes as the nearest isotopes to typical vibrational limit while 34 74 − 80 S e isotopes tend towards the rotational region that lied on U(5) - SU(3), leg of “Casten’s triangle”. Spin and party for many energy levels and electromagnetic transition probability are confirmed. The mixing symmetry states in 34 72 − 78 S e isotopes are slowly increased with ζ2 while there is no clear effected in 34 80 S e isotope. The calculated branching ratios B(E2), B(M1) mixing ratios δ(E2/M1), B(E0), and X(E0/E2) depend in comparisons with fewer available experimental data. The results are in acceptable agreement; to completed a perfect comparison, more experimental investigations are still needed to these nuclei. 34 72 − 80 S e isotopes have small values of electric quadruple moment of 2 1 + state.