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On the beta-decay of C-9

U. C. Bergmann ; M. J. G. Borge ; R. Boutami ; L. M. Fraile ; H. O. U. Fynbo ; P. Hornshoj ; Björn Jonson (Institutionen för experimentell fysik, Subatomär fysik) ; Karin Markenroth (Institutionen för experimentell fysik, Subatomär fysik) ; I. Martel ; I. Mukha ; Thomas Nilsson (Institutionen för experimentell fysik, Subatomär fysik) ; Göran Nyman (Institutionen för experimentell fysik, Subatomär fysik) ; A. Oberstedt ; Y. P. Alonso ; K. Riisager ; H. Simon ; O. Tengblad ; Fredrik Wenander (Institutionen för experimentell fysik, Subatomär fysik ; Extern) ; Katarina Wilhelmsen Rolander (Institutionen för experimentell fysik, Subatomär fysik)
Nuclear Physics A (0375-9474). Vol. 692 (2001), 3-4, p. 427-450.
[Artikel, refereegranskad vetenskaplig]

In beta -decay experiments on C-9 at CERN/ISOLDE the beta -strength was determined to the ground state, the 12.2 MeV excited state and the Isobaric Analog State (IAS) at 14.655 MeV in B-9. A large beta -strength asymmetry is deduced for the mirror transitions of C-9 and Li-9 to states around 12 MeV excitation energy. A satisfactory description of the three-body decay from a narrow energy region around the 12.2 MeV resonance is obtained within a sequential model involving the ground and first-excited states of Li-5 and Be-8. From the study of angular correlations the spin of the 12.2 MeV state is determined as 5/2(-). For the first time the population of the IAS is observed in beta -decay and new information on the decay of this state is obtained. The advantages of a closely packed. highly segmented detector setup are demonstrated. (C) 2001 Elsevier Science B.V. All rights reserved.

Nyckelord: C-9(beta(+)) [from O,Ca(p,X)], measured beta-delayed E-p, E alpha, p, alpha alpha-coin., angular correlations, B-9 deduced beta-branching, strengths, decay mechanism features, A=9 beta-decay asymmetry., double-sided silicon strip detectors, mass-separated source, DELAYED PROTON, NUCLEAR SYSTEM, LIGHT-NUCLEI, SHELL-MODEL, DRIP-LINE, EMISSION, ASYMMETRY, CONTINUUM, STATES, LI-9

Denna post skapades 2006-08-28. Senast ändrad 2014-09-02.
CPL Pubid: 10888


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