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HK: Fachverband Hadronen und Kerne

HK 59: Nuclear Structure and Dynamics II

HK 59.9: Vortrag

Mittwoch, 18. März 2009, 18:45–19:00, H-ZO 50

β decay studies of ¹¹Li, ¹¹Be and ⁸B with an implantation technique — •Jeroen Büscher — Katholieke Universiteit Leuven, Leuven, Belgium

The charged particle emission in the β decay of the halo nuclei ¹¹Li and ¹¹Be were studied at the ISAC facility at TRIUMF by implanting postaccelerated ¹¹Li ions into a segmented silicon detector. The high degree of pixelazation, the small active volume of the detector and the precise energy of the radioactive ion beam are the key features of the experimental setup. Among the advantages of the method are a good precision of the overall normalization and a reduction of the background due to β radiation. A precise branching ratio for both the deuteron and triton emission channel in the β decay of ¹¹Li was measured together with an energy spectrum of the emitted charged particles. The results provide important information on the decay and open up a new means to study the halo wave function of ¹¹Li. In addition to these results the charged particle emission in the β decay of the daughter nucleus ¹¹Be could be measured. We will also report on the first results of a recent experiment measuring the ⁸B neutrino spectrum. This result is derived from the energy spectrum of the 2 α particles emitted in the β decay of ⁸B. This measurement was performed using the same technique, implanting the ⁸B ions at KVI in Groningen, The Netherlands.