Relative proton and γ widths of astrophysically important states in $^{30}$S studied in the β-delayed decay of $^{31}$Ar - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physical Review C Year : 2013

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

G. T. Koldste
  • Function : Author
Bertram Blank
M.J.G. Borge
  • Function : Author
J.A. Briz
  • Function : Author
M. Carmona-Gallardo
  • Function : Author
L.M. Fraile
  • Function : Author
H.O.U. Fynbo
  • Function : Author
J. Giovinazzo
J.G. Johansen
  • Function : Author
A. Jokinen
  • Function : Author
B. Jonson
  • Function : Author
J. H. Kusk
  • Function : Author
T. Nilsson
A. Perea
  • Function : Author
V. Pesudo
  • Function : Author
E. Picado
  • Function : Author
K. Riisager
  • Function : Author
A. Saastamoinen
  • Function : Author
O. Tengblad
  • Function : Author

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.

Dates and versions

in2p3-00827313 , version 1 (09-10-2013)

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Cite

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, 2013, 87, pp.055808. ⟨10.1103/PhysRevC.87.055808⟩. ⟨in2p3-00827313⟩
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