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Beta-delayed multiparticle emission studies at ISOL-type facilities

M. J. G. Borge ; U. C. Bergmann ; R. Boutami ; J. Cederkall ; P. Dendooven ; L. M. Fraile ; H. O. U. Fynbo ; W. X. Huang ; J. Huikari ; Y. Jading ; H. Jeppesen ; A. Jokinen ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; I. Martel ; Mikael Meister (Institutionen för experimentell fysik, Subatomär fysik) ; Thomas Nilsson (Institutionen för experimentell fysik, Subatomär fysik) ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; Y. Prezado ; K. Riisager ; Olof Tengblad ; L. Weissman ; Katarina Wilhelmsen (Institutionen för experimentell fysik, Subatomär fysik) ; J. Aysto
Nuclear Physics A (0375-9474). Vol. 746 (2004), p. 243C-247C.
[Konferensbidrag, refereegranskat]

We report here on the recent beta-decay studies made at ISOL-type Facilities to determine the multiparticle breakup mechanism of excited states in light nuclei by studying them in full kinematics. In particular the results obtained for the A = 9 isobars and the breakup of the 12.7 MeV state in C-12 of unnatural parity are discussed. The breakup of the latter has been debated since more than a decade. 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. As no asymmetry is found in the gs to gs transition it must be due to the particular structure of these excited states. The controversy on the breakup mechanism of the 12.7 MeV state is resolved.

Nyckelord: decay, be-9, scattering, nuclei, li-9

Denna post skapades 2013-04-02. Senast ändrad 2014-09-02.
CPL Pubid: 175216


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