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Collisions profondément inélastiques entre ions lourds auprès du Tandem d'Orsay & Spectroscopie g des noyaux exotiques riches en neutrons de la couche fp avec le multidétecteur germanium ORGAM

Abstract : This PhD thesis was prepared within the nuclear structure group of IPN Orsay. The work presented aimed to produce neutron rich fp shell nuclei through heavy ion collisions at the tandem accelerator of IPN, and to study them using gamma spectroscopy. For this purpose, a germanium gamma array called ORGAM, dedicated to high resolution gamma spectroscopy, was set up at the tandem accelerator. During the year 2008/2009, the individual germanium detectors were tested and repaired, as well as their ancillary anti-Compton shielding. At the same time, the liquid nitrogen auto-fill system was improved for better reliability. The array was finally set up on a beam line of the accelerator. The first experiment using the ORGAM array was performed in July 2009. This experiment aimed to study fully damped deep-inelastic collisions between a 36S beam accelerated to 154 MeV, and a 70Zn target. An additional charged particle detection system was used to detect interesting fragments emitted at backward angles. It was not possible to separate these fragments from the background induced by backscattered ions from the beam. Nevertheless, the study of gamma-gamma coincidences detected with the ORGAM array allowed to identify gamma cascades de-exciting nuclei potentially produced through the mechanism of interest. Data accumulated during another experiment performed at the tandem accelerator in 2005 were analyzed. Fusion-evaporation reaction between a 25 MeV, 14C beam focused on a 48Ca target produced the 57Cr and 59Mn nuclei, whose energy spectra were established up to 3 MeV. We attempted to study theoretically odd Chromium isotopes with a simple model based on the intermediate coupling scheme. The model provides an accurate description of the excitation energy spectrum for the semi-magic + 1 neutron, 53Cr. However, the description of mid-shell nuclei 55Cr and 57Cr with this model which doesn't take into account correlations between valence nucleons is much less satisfactory than for 53Cr.
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Submitted on : Wednesday, December 21, 2011 - 2:44:55 PM
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M. Ferraton. Collisions profondément inélastiques entre ions lourds auprès du Tandem d'Orsay & Spectroscopie g des noyaux exotiques riches en neutrons de la couche fp avec le multidétecteur germanium ORGAM. Physique Nucléaire Expérimentale [nucl-ex]. Université Paris Sud - Paris XI, 2011. Français. ⟨tel-00654270⟩

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