Mesure de periode et de probabilite d'emission de neutrons retardes des isotopes $^{44}$S $^{45-47}$Cl a l'aide du spectrometre LISE : leur implication pour la comprehension du rapport $^{48}$Ca/$^{46}$Ca dans le systeme solaire

Abstract : After a detailed description of the simulation program LISE, experimental measurements of the radioactive decay (half-lives and neutron delayed emission probabilities) of the neutron rich nuclei 44S, 45-47Cl are presented. The comparison between these results and the theoritical predictions clearly shows that mass and deformation measurements of these nuclei are very important to determine precisely the radioactive decay parameters necessary to astrophysics. Effectively, these ones are used in star evolution models to understand the elements abundance curve of the solar system. Even if the shape of this curve is well reproduced, some anomalies subsist. The experimental results seem to show that, with the constraints they bring, a double r process in low-mass supernovae of type II can explain twice the isotopic anomalies and the shape of the elements abundance curve.
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O. Sorlin. Mesure de periode et de probabilite d'emission de neutrons retardes des isotopes $^{44}$S $^{45-47}$Cl a l'aide du spectrometre LISE : leur implication pour la comprehension du rapport $^{48}$Ca/$^{46}$Ca dans le systeme solaire. Physique Nucléaire Expérimentale [nucl-ex]. Université Paris-Diderot - Paris VII, 1991. Français. ⟨in2p3-00014967⟩

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