Vol. 53, No. 3
September 1999
pp. 425-429

Transition strengths and shapes of 2-qp bands in ⁷⁴Se and ⁷⁶Kr

G MUKHERJEE^{1 ; 2},P JOSHI¹,S N ROY²,S DATTA³, R P SINGH¹,S MURALITHAR¹and R K BHOWMIK¹

¹Nuclear Science Centre, Post Box 10502, New Delhi 110 067, India
²Department of Physics, Visva-Bharati University, Santiniketan 731 235, India
³Department of Physics, University of Calcutta, Calcutta 700 009, India

Abstract.

The lifetimes of the states of -ve parity 2-qp bands of N = 40 nuclei ⁷⁴Se and ⁷⁶Kr were measured. The transition strengths and quadrupole moments, obtained from the lifetimes, show a large collectivity of such bands in both the nuclei. The alignment frequencies were calculated from Woods-Saxon cranking model. Previously suggested quasi proton nature of band 5 and 6 of ⁷⁴Se were argued to be based on quasi neutron excitations. The total Routhian surface calculations suggest triaxial shapes with large +ve and -ve values of triaxiality parameter after proton and neutron alignments in these bands respectively.

Keywords. Heavy ion; g - g coincidence; DSAM; Woods-Saxon cranking; TRS.

PACS Nos 23.30.Lv; 21.10.Tg; 27.50.+e

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