Further evidence on shape coexistence in 72As

Sohler, D. and Podolyak, Zs. and Dombradi, Zs. and Gulyas, J. and Algora, A. and Brant, Slobodan and Krstić, Vladimir and Paar, Vladimir (1999) Further evidence on shape coexistence in 72As. Physical Review C, 59 (3). pp. 1328-1333. ISSN 0556-2813

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Abstract

The 72As nucleus was studied via the (α,nγ) reaction at 14.2 MeV bombarding energy. Single γ−,γγ-coincidence, and internal conversion electron spectra were measured with Ge(HP) γ-ray and superconducting magnetic lens plus Si(Li) electron spectrometers. On the basis of the internal conversion coefficients of72As transitions, parities of the medium-spin levels up to 1.4 MeV excitation energy were determined, resulting in unambiguous parities also for the heads of the bands observed previously. The states observed were assigned to proton-neutron multiplets on the basis of their decay properties. The energy splittings of the observed multiplets are in accordance with the prediction of the previous interacting boson-fermion-fermion model (IBFFM) calculations using a transitional core lying between the vibrational SU(5) and γ-soft O(6) limits, except that of the πg9/2νg9/2 multiplet, which was described using the deformed SU(3) core in the present IBFFM calculations. Such a core structure is in accordance with previous particle-rotor and Hartree-Fock-Bogoliubov calculations.

Item Type: Article
Keywords: nuclear shape, coexistence, IBFFM, nucleus As-72
Date: March 1999
Subjects: NATURAL SCIENCES > Physics
Additional Information: Copyright (1999) by the American Physical Society.
Divisions: Faculty of Science > Department of Physics
Project code: 119211
Publisher: American Physical Society
Depositing User: Gordana Stubičan Ladešić
Date Deposited: 14 May 2014 16:12
Last Modified: 14 May 2014 16:12
URI: http://digre.pmf.unizg.hr/id/eprint/1304

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