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

AutorGarcía Borge, María José ; Prezado, Yolanda ; Bergmann, U. C.; Boutami, Rafik ; Cederkäll, J.; Diget, C. Aa.; Fraile, Luis M. ; Fynbo, H. O. U.; Jading, Y.; Jeppesen, H.; Jonson, B.; Martel, Ismael; Meister, M.; Nilsson, T.; Nyman, G.; Riisager, K.; Simon, H.; Tengblad, Olof ; Weissman, L.; Wenander, F.; Wilhelmsen, K.
Fecha de publicación28-jun-2004
CitaciónNuclear Physics A 738: 206-210 (2004)
ResumenWe report here on the recent β-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 β-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.
Descripción5 pages, 2 tables, 2 figures.-- Issue title: Proceedings of the 8th International Conference on Clustering Aspects of Nuclear Structure and Dynamics (Nara, Japan, Nov 24-29, 2003).
Versión del editorhttp://dx.doi.org/10.1016/j.nuclphysa.2004.04.074
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