Asymmetry in the super-allowed β-transitions of the A=9 isobars

María José García Borge ,R Boutami,K Riisager,O Tengblad ,U C Bergmann ,H Simon ,L M Fraile ,F Wenander ,M Meister ,Yolanda Prezado ,L Weissman ,T Nilsson ,H Jeppesen ,I Martel ,Y Jading ,C Aa Diget ,H O U Fynbo ,J Cederkäll ,G Nyman ,B Jonson ,Katarina Wilhelmsen

doi:10.1016/j.nuclphysa.2004.04.074

Asymmetry in the super-allowed β-transitions of the A=9 isobars

María José García Borge , R Boutami + Show 19 more

https://doi.org/10.1016/j.nuclphysa.2004.04.074

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Journal: Nuclear physics. A	Publication Date: Jun 1, 2004
Citations: 1

Affiliation: Instituto de Estructura de la Materia, Aarhus University, European Organization for Nuclear Research, Technical University of Darmstadt, Chalmers University of Technology, Universidad de Huelva

#Large Asymmetry Factor #Mechanisms Of Breakup + Show 8 more

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Abstract

We report here on the recent beta-decay studies of the A = 9 isobar made at ISOLDE/CERN. Mirror beta transitions in the A=9 chain are compared and a large asymmetry factor is deduced for the transitions to high excitation energy in Be-9 (11.8 MeV) and B-9 (12.2 MeV) fed in the beta-decay of Li-9 and C-9 respectively. It is shown that the asymmetry is not due to experimental problems or differences in the mechanisms of breakup or in the spin of the states. Only differences in the partial decay branches of the breakup channels have been found. As no asymmetry is found in the gs to gs transition it must be due to the particular structure of these excited states.

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