One-proton breakup of 24Si and the 23Al(p,γ)24Si reaction in type i x-ray bursts

A. Banu, F. Carstoiu, N. L. Achouri, W. N. Catford, M. Chartier, B. Fernández-Domínguez, M. Horoi, B. Laurent, N. A. Orr, S. Paschalis, N. Patterson, B. Pietras, B. T. Roeder, P. Roussel-Chomaz, J. S. Thomas, L. Trache, R. E. Tribble

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Abstract

Background: To understand explosive hydrogen burning in stars and to explore various explosive scenarios such as type I x-ray bursts (XRBs), reliable reaction rates are needed. The cross sections for radiative proton capture on near-dripline nuclei are necessary for the determination of the reaction rates, but cannot be measured directly. Purpose: To determine the reaction rate for the radiative proton capture reaction 23Al(p,γ )24Si using indirect methods and, as a consequence, evaluate if sequential 2p capture on 22Mg seed nuclei is significant at high temperatures. Method: Nonresonant radiative proton capture on 23Al is investigated using the one-proton breakup of 24Si at 61 MeV/nucleon and the asymptotic normalization coefficient (ANC) for 24Sigs→23Al+p is deduced. Results: From the ANC, the nonresonant component of the astrophysical S-factor for the 23Al(p,γ)24Si reaction is determined and, using other new experimental data the resonant component is re-evaluated. Conclusions: The 23Al(p,γ)24Si reaction is of interest for type I XRB nucleosynthesis and its reaction rate can affect both the 22Na abundance and the total energy output. New determinations of the rates for the 22Mg(p,γ)23Al (p,γ)24Si reaction chain are provided here and we point to the need that they be included in XRB scenarios.

Original languageEnglish
Article number015806
JournalPhysical Review C - Nuclear Physics
Volume86
Issue number1
DOIs
StatePublished - Jul 17 2012

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