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One-proton breakup of 24Si and the 23Al( p, γ )24Si reaction in type I x-ray bursts
Banu A., Carstoiu F., Achouri N.L., Catford W.N., Chartier M. et al
Physical Review C 86 (2012) 015806 - http://hal.in2p3.fr/in2p3-00719389
Physique/Physique Nucléaire Expérimentale
One-proton breakup of 24Si and the 23Al( p, γ )24Si reaction in type I x-ray bursts
A. Banu, F. Carstoiu, N.L. Achouri1, W.N. Catford, M. Chartier, B. Fernandez-Domınguez, M. Horoi, B. Laurent1, N.A. Orr1, S. Paschalis, N. Patterson, B. Pietras, B.T. Roeder, P. Roussel-Chomaz2
1 :  LPCC - Laboratoire de Physique Corpusculaire de Caen
http://www.lpc-caen.in2p3.fr/
CNRS : UMR6534 – IN2P3 – Université de Caen Basse-Normandie – Ecole Nationale Supérieure d'Ingénieurs de Caen
ENSICAEN - 6, boulevard du Marechal Juin 14050 Caen Cedex
France
2 :  GANIL - Grand Accélérateur National d'Ions Lourds
http://www.ganil-spiral2.eu
CNRS : UPR3266 – IN2P3 – CEA : DSM/GANIL
Bvd Henri Becquerel - BP 55027 - 14076 CAEN CEDEX 5
France
Structure nucléaire
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.

Articles dans des revues avec comité de lecture
2012
Physical Review C (Phys. Rev. C)
Publisher American Physical Society
ISSN 0556-2813 (eISSN : 1089-490X)
86
015806

GANIL 2012-084 A
21.10.Jx, 25.60.Gc, 26.30.Ca, 27.30.+t
Expérience GANIL/SPEG/EXOGAM