EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J A 2, 129-141

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 Communicated by D. Schwalm

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 $\alpha - e_{\rm K,L,M}$ angular correlation measurements have been analysed using the correct ground state spins of 227Th(=1/2+) and 223Ra(=3/2+) for the first time.
to 9ptThe analysis has allowed unique J$^{\pi}$ values to be assigned to almost all levels below 400 keV excitation in 223Ra.
to 9ptValues of $(g_{\rm K} - g_{\rm R})/Q_0$ have been deduced for several members of the $K = 3/2^{\pm}$ bands (for the first time in an odd N nucleus in this mass region) allowing estimates of gK and gR to be extracted. The values of gK and gR 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

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