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Nouvelle méthode expérimentale dédiée à l'étude des modes collectifs dans les noyaux exotiques.

Influence de la superfluidité sur le temps de refroidissement d'une étoile à neutrons.

Abstract : Giant monopole (GMR) and quadrupole (GQR) resonances have been measured in the 56Ni using inelastic scattering of 50 A.MeV deuteron at the Grand Accélérateur National d'Ions Lourds facility. This is the first experimental observation of isoscalar collective modes in a short-lived nucleus. The secondary beam was impinged on the active target Maya filled with a pure deuterium gas. Recoiling deuterons were detected in Maya and in a wall of nine silicon detectors. The GMR and GQR are centered at 19.3(0.5) and 16.2(0.5) MeV, respectively. Corresponding angular distributions were extracted from 3 to 7 degrees in the centre of masse frame. DWBA analysis based on RPA transition densities yields the percentage of the energy weighted sum rule exhausted : 136(27) % for the GMR et 76(13) % for the GQR.

A finite temperature Hartree-Fock-Bogoliubov model was implemented to describe the 10 Wigner-Seitz cells which compose the inner crust of neutron stars and to microscopically calculate their specific heat. Calculations are performed with two contact pairing forces chosen to simulate the pairing properties of uniform neutron matter corresponding to the BCS approximation and to polarisation effects. Under the assumption of a rapid cooling of the core and an initial temperature of 100 keV in the inner crust, the cooling time of the star was estimated at 9 and 34 years, respectively.
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Submitted on : Monday, January 28, 2008 - 2:29:00 PM
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Charlotte Monrozeau. Nouvelle méthode expérimentale dédiée à l'étude des modes collectifs dans les noyaux exotiques.

Influence de la superfluidité sur le temps de refroidissement d'une étoile à neutrons.. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2007. Français. ⟨tel-00221226⟩

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