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Closed Access item Study of the giant Gamow-Teller resonance in nuclear β-decay: The case of Ar-32

Authors:Björnstad, T.
García Borge, María José
Dessagne, P.
Von Dincklage, R.-D.
Ewan, G. T.
Hansen, P. G.
Huck, A.
Jonson, B.
Klotz, G.
Knipper, A.
Larsson, P. O.
Nyman, G.
Ravn, H. L.
Richard-Serre, C.
Riisager, K.
Schardt, D.
Walter, G.
Keywords:Radioactivity Ar-32 (β+p) [from Ca-40 (p,3p6n) reaction], Measured β-delayed Ep, Ip, Eγ, Iγ, pγ-coin, Ar-32 deduced T1/2 , proton branching ratio, β strength function, CaO target, Ge, surface barrier Si, CsI detectors, On-line mass separation
Issue Date:30-Sep-1985
Citation:Nuclear Physics A 443(2): 283-301 (1985)
Abstract:Delayed proton and gamma emissions following the β-decay of Ar-32 have been studied. The half-life of Ar-32 is 98 ± 2 ms, and the T = 2 analogue state in Cl-32 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 S-31. A level scheme up to 8.75 MeV excitation in Cl-32 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.
Description:19 pages, 9 figures, 3 tables.
Publisher version (URL):http://dx.doi.org/10.1016/0375-9474(85)90264-7
Appears in Collections:(CFMAC-IEM) Artículos

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