Title

Transition Strengths and the Role of the f7/2 Orbital in 7 I AS

Document Type

Article

Publication Date

2011

Publication Title

Physical Review C

Volume Number

83

Issue Number

4

DOI

10.1103/PhysRevC.83.044316

Abstract

High-spin states in 71As were studied using the 54Fe(23Na,α2p) reaction at 80 MeV. Prompt γ-γcoincidences were measured using the Florida State University Compton-suppressed Ge array consisting of three clover detectors and seven single-crystal detectors. The existing high-spin level scheme has been verified, and 21 new transitions have been added based on an investigation of weak γ-ray coincidence relations and relative γ-ray intensities. Lifetimes of 16 excited states were measured using the Doppler-shift attenuation method applied to the experimental line shapes of decays in all of the known rotational bands. The B(E2) strengths inferred from the lifetimes indicate that moderate to high collective behavior persists to the highest observed spins in the lowest positive- and negative-parity bands, in qualitative agreement with projected shell-model calculations. The band suggested to be based on the πf7/2 orbital shows a similar degree of collectivity within the same spin range, with B(E2) values in good agreement with those predicted by the projected shell model assuming a constant prolate deformation of ε2=+0.27. The experimental Qt values in this band are somewhat smaller than predicted by cranked Woods-Saxon calculations.

ISSN

0556-2813

Link Out URL

https://doi.org/10.1103/PhysRevC.83.044316

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