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Relative proton and γ widths of astrophysically important states in $^{30}$S studied in the β-delayed decay of $^{31}$Ar

Abstract : Resonances just above the proton threshold in 30S affect the 29P(p, γ )30S reaction under astrophysical conditions. The (p,γ )-reaction rate is currently determined indirectly and depends on the properties of the relevant resonances. We present here a method for finding the ratio between the proton and γ partial widths of resonances in 30S. The widths are determined from the β2p- and βpγ -decay of 31Ar, which is produced at the ISOLDE radioactive ion beam facility at the European research organization CERN. Experimental limits on the ratio between the proton and γ partial widths for astrophysical relevant levels in 30S have been found for the first time. A level at 4689.2(24) keV is identified in the γ spectrum, and an upper limit on the p/ γ ratio of 0.26 (95% C.L.) is found. In the two-proton spectrum two levels at 5227(3) keV and 5847(4) keV are identified. These levels were previously seen to γ decay and upper limits on the γ/ p ratio of 0.5 and 9, respectively, (95% C.L.) are found, where the latter differs from previous calculations.
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http://hal.in2p3.fr/in2p3-00827313
Contributor : Michel Lion <>
Submitted on : Wednesday, October 9, 2013 - 2:31:13 PM
Last modification on : Friday, November 13, 2020 - 7:54:02 AM

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G. T. Koldste, Bertram Blank, M.J.G. Borge, J.A. Briz, M. Carmona-Gallardo, et al.. Relative proton and γ widths of astrophysically important states in $^{30}$S studied in the β-delayed decay of $^{31}$Ar. Physical Review C, American Physical Society, 2013, 87, pp.055808. ⟨10.1103/PhysRevC.87.055808⟩. ⟨in2p3-00827313⟩

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