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Etude de noyaux légers riches en neutrons à l'aide du multidétecteur TONNERRE

Abstract : This work concern the technical development made on the multidetector TONNERRE and the study of the 34Si nucleus by a complete beta-neutron-gamma spectroscopy.
In the first part various tests performed on modules of the detector in the "Centre d'Etude de Bruyère le Châtel" are presented. A modification of the embassies of the photomultipliers tubes allows to gain more than 50% in the neutron efficiency and to obtain a threshold lower than 300 keV for the neutron energy. A complete C++ simulation of the neutron propagation in the array was carried out. It explains that the slow component of the light output of the scintillator may be responsible of the shape of the time-of-flight spectrum.
The second part of these report presents the experiment devoted to the study of the structure of the 34Si from the beta decay of the 34Al. It was performed at the GANIL facility using the TONNERRE array and germanium of EXOGAM. The 34Al was produced by projectile fragmentation of a 36S beam of 50 MeV/A in a target of 9Be. A complete beta scheme of the 34Al is proposed. Eight neutron lines following the 34Al decay were observed for the first time. Finally we suggest that a monopolar transition could occur in the 34Si nucleus signing a 0+2 state at 2133 keV.
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https://tel.archives-ouvertes.fr/tel-00003438
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Submitted on : Tuesday, September 30, 2003 - 3:53:24 PM
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  • HAL Id : tel-00003438, version 1

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S. Piétri. Etude de noyaux légers riches en neutrons à l'aide du multidétecteur TONNERRE. Physique Nucléaire Théorique [nucl-th]. Université de Caen, 2003. Français. ⟨tel-00003438⟩

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