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Mesure de masse de noyaux à halo et refroidissement de faisceaux avec l'expérience MISTRAL

Abstract : Halo nuclides are a spectacular drip-line phenomenon and their description pushes nuclear theories to the limits. The most critical input parameter is the nuclear binding energy; a quantity that requires excellent measurement precision, since the two-neutron separation energy is small at the drip-line by definition. Moreover halo nuclides are typically very short-lived. Thus, a high accuracy instrument using a quick method of measurement is necessary. MISTRAL is such an instrument; it is a radiofrequency transmission mass spectrometer located at ISOLDE/CERN. In July 2003 we measured the mass of the 11Li , a two-neutron halo nuclide. Our measurement improves the precision by a factor 6, with an error of 5 keV. Moreover the measurement gives a two-neutron separation energy 20% higher than the previous value. This measurement has an impact on the radius of the nucleus, and on the state of the two valence neutrons. At the same time, a measurement of the 11Be was performed with an uncertainty of 4 keV, in excellent agreement with previous measurements. In order to measure the mass of the two-neutron halo nuclide 14Be, an ion beam cooling system is presently under development which will increase the sensitivity of the spectrometer. The second part of this work presents the development of this beam cooler using a gas-filled Paul trap.
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Submitted on : Friday, January 21, 2005 - 3:05:17 PM
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Cyril Bachelet. Mesure de masse de noyaux à halo et refroidissement de faisceaux avec l'expérience MISTRAL. Physique Nucléaire Théorique [nucl-th]. Université Paris Sud - Paris XI, 2004. Français. ⟨tel-00008223⟩

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