The European Physical Journal A

ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)

Table of Contents

Abstract Volume 2 Issue 2 (1998) pp 129-141

nuclear structure: A study of ²²³Ra populated by <alpha>-decay

G.D. Jones, P.A. Butler, T.H. Hoare, P.M. Jones (*)

Oliver Lodge Laboratory, University of Liverpool, P.O.Box 147, Liverpool, L69 7ZE, United Kingdom

Received: 17 November 1997 / Revised version: 8 January 1998

Abstract: The low spin states of ²²³Ra have been populated via <alpha>-decay from ²²⁷Th which was itself produced following <beta>^- decay of an ²²⁷Ac source. <alpha>-<Gamma> and <alpha> - e_K,L,M angular correlation measurements have been analysed using the correct ground state spins of ²²⁷Th(=1/2⁺) and ²²³Ra(=3/2⁺) for the first time. The analysis has allowed unique J^<pi> values to be assigned to almost all levels below 400 keV excitation in ²²³Ra. Values of (g_K - g_R)/Q₀ have been deduced for several members of the K = 3/2^± bands (for the first time in an odd N nucleus in this mass region) allowing estimates of g_K and g_R to be extracted. The values of g_K and g_R are not significantly different for the positive and negative parity band members and tend to support other strong evidence that stable octupole deformation exists in ²²³Ra at low excitation energies.

PACS: 23.60.+e <alpha> decay - 23.20.En Angular distribution and correlation measurements - 21.10.Ky Electromagnetic moments

(*) Present address: Accelerator Laboratory, Physics Department, University of Jyväskylä, P O Box 35, Finland, SF-40351
Communicated by D. Schwalm

Article in PDF-Format (468 KB)

Online publication: June 16, 1998
LINK Helpdesk
© Springer-Verlag Berlin Heidelberg 1998