Etude de la réaction d'intérêt astrophysique 60Fe(n; gamma)61Fe par réaction de transfert (d,p) gamma

Abstract : 60Fe is of special interest in nuclear astrophysics. Indeed the recent observations of 60Fe caracteristic gamma-ray lines by the RHESSI and INTEGRAL spacecrafts allowed to measure the total flux of 60Fe over the Galaxy. Moreover the observation in presolar grains of an excess of the daughter-nuclei of 60Fe, 60Ni, gives constraints on the conditions of formation of the early solar system. However, the cross-sections of some reactions involved in 60Fe nucleosynthesis and included to stellar models are still uncertain. The destruction reaction of 60Fe, 60Fe(n, gamma)61Fe, is one of them. The total cross-section can be separate into two contributions : the direct one, involving states below the neutron separation threshold of 61Fe, and the resonant one.We improved 61Fe spectroscopy in order to evaluate the direct capture part of the 60Fe(n, gamma)61Fe reaction cross-section. 60Fe(n, gamma)61Fe was thus studied via d(60Fe, p gamma)61Fe transfer reaction with the CATS/MUST2/EXOGAM setup at LISE-GANIL. DWBA analysis of experimental proton differential cross-sections allowed to extract orbital angular momentum and spectroscopic factors of different populated states identified below the neutron threshold. A comparison of experimental results for 61Fe with experimental results for similar nuclei and with shell-model calculations was also performed.
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Other [cond-mat.other]. Université Paris Sud - Paris XI, 2011. French. <NNT : 2011PA112336>


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Sandra Giron. Etude de la réaction d'intérêt astrophysique 60Fe(n; gamma)61Fe par réaction de transfert (d,p) gamma. Other [cond-mat.other]. Université Paris Sud - Paris XI, 2011. French. <NNT : 2011PA112336>. <tel-00661697>

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