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Study of the Giant Gamow-Teller Resonance in Nuclear Beta-Decay - the Case of Ar-32

T. Bjornstad ; M. J. G. Borge ; P. Dessagne ; R. D. Vondincklage ; G. T. Ewan ; P. G. Hansen ; A. Huck ; Björn Jonson (Fysiska institutionen) ; G. Klotz ; A. Knipper ; P. O. Larsson ; Göran Nyman (Fysiska institutionen) ; H. L. Ravn ; C. Richardserre ; K. Riisager ; D. Schardt ; G. Walter
Nuclear Physics A (0375-9474). Vol. 443 (1985), 2, p. 283-301.
[Artikel, refereegranskad vetenskaplig]

Delayed proton and gamma emissions following the β-decay of 32Ar have been studied. The half-life of 32Ar is 98 ± 2 ms, and the T = 2 analogue state in 32Cl lies at the excitation energy 5036 ± 12 keV. From the intensity of the feeding to this state the proton intensities can be converted to an absolute scale leading to a total proton branching ratio of (43 ± 3)%. From proton-gamma coincidence measurements it emerges that (1.9 ± 0.2)% of the protons lead to the first-excited state in 31S. A level scheme up to 8.75 MeV excitation in 32Cl has been constructed and the Gamow-Teller strength function has been deduced. The result is a renormalization of the axial-vector strength to (49 ± 5)% of the free-nucleon value.



Denna post skapades 2006-08-28. Senast ändrad 2013-07-10.
CPL Pubid: 10968

 

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