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

Summary, in English

We 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 ⁹Be (11.8 MeV) arid ⁹B (12.2 MeV) fed in the β-decay of ⁹Li and ⁹C 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.

• Author: M. J G Borge; Y. Prezado; U. C. Bergmann; R. Boutami; J. Cederkäll; C. Aa Diget; L. M. Fraile; H. O U Fynbo; Y. Jading; H. Jeppesen; B. Jonson; I. Martel; M. Meister; T. Nilsson; G. Nyman; K. Riisager; H. Simon; O. Tengblad; L. Weissman; F. Wenander; K. Wilhelmsen
• Publishing year: 2004-06-28
• Language: English
• Pages: 206-210
• Publication/Series: Nuclear Physics A
• Volume: 738
• Issue: 1-4 SUPPL.
• Links: http://dx.doi.org/10.1016/j.nuclphysa.2004.04.074
• Document type: Journal article
• Publisher: Elsevier
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 0375-9474