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Relative proton and gamma widths of astrophysically important states in S-30 studied in the beta-delayed decay of Ar-31

G. T. Koldste ; B. Blank ; M. J. G. Borge ; J. A. Briz ; M. Carmona-Gallardo ; L. M. Fraile ; H. O. U. Fynbo ; J. Giovinazzo ; J. G. Johansen ; A. Jokinen ; Björn Jonson (Institutionen för fundamental fysik, Subatomär fysik) ; T. Kurturkian-Nieto ; J. H. Kusk ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik) ; A. Perea ; V. Pesudo ; E. Picado ; K. Riisager ; A. Saastamoinen ; Olof Tengblad ; J. C. Thomas ; J. Van de Walle
Physical Review C (0556-2813). Vol. 87 (2013), 5,
[Artikel, refereegranskad vetenskaplig]

Resonances just above the proton threshold in S-30 affect the P-29(p, gamma)S-30 reaction under astrophysical conditions. The (p,gamma)-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 gamma partial widths of resonances in S-30. The widths are determined from the beta 2p- and beta p gamma-decay of Ar-31, 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 gamma partial widths for astrophysical relevant levels in S-30 have been found for the first time. A level at 4689.2(24) keV is identified in the gamma spectrum, and an upper limit on the Gamma(p)/ Gamma gamma 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 gamma decay and upper limits on the Gamma(gamma)/Gamma(p) ratio of 0.5 and 9, respectively, (95% C.L.) are found, where the latter differs from previous calculations.



Denna post skapades 2013-07-08. Senast ändrad 2014-09-02.
CPL Pubid: 179921

 

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Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)

Ämnesområden

Fysik
Subatomär fysik
Kärnfysik
Lågenergifysik
Astronomi, astrofysik och kosmologi
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