Feb 6 – 8, 2006
CERN
Europe/Zurich timezone

Multiple particle break-up in the 11Li beta-decay

Feb 7, 2006, 12:35 PM
20m
Council Chamber, 503/1-001 (CERN)

Council Chamber, 503/1-001

CERN

CH-1211 Geneva 23

Speaker

Mr Miguel Madurga Flores (Consejo Superior de Investigaciones Cientificas (CSIC))

Description

Light nuclei near the neutron drip-line have been studied intensively since the discovery of halos in this region. The complexity of their decays represent a great task for both theoretical and experimental nuclear physics. The 11Li, the nucleus studied in this work, exhibit a complex beta decay. The high Q-beta value (20.6 MeV) and the low nucleon binding energy in the neighbour nuclei allows multiple decay channels, several of them involving the delayed emission of charged particles. We report here on the study of the decay channels involving charged particles in the final states (IS-417). The aim of the experiment is to disentangle the multiple particle break-up channles taking advantage of the new segmented silicon detectors, since the simultaneous detection of the particles energies and hit positions is crucial to determine the correct decay scheme. The experimental set-up was designed to fulfill this condition, consisting in four DSSSD detectors in a compact cubic geometry. The highly segmented nature of the DSSSD allows to reconstruct the particles momenta from their impinging position. The decay channels that involve two charged particles in the final state have been analysed. Special attention was given to the 11Li-->11Be*-->10Be*+n-->6He+alpha+n channel. The coincidence spectrum and reconstructed excitation energy of this channel will be shown. The decay through the previously known resonance at 9.5 MeV in 10Be is identified in this resonance spectrum. The excitation energy in 8Be will be shown as well, where possible resonances through the 11Li-->11Be*-->2alpha+3n decay channel were looked for. Simulations of these decay channels will be shown.

Primary author

Mr Miguel Madurga Flores (Consejo Superior de Investigaciones Cientificas (CSIC))

Co-authors

Dr Hans Fynbo (Univerity of Aarhus) Dr Karsten Riisager (CERN) Dr Maria Jose Garcia Borge (Consejo Superior de Investigaciones Cientificas (CSIC)) Dr Olof Tengblad (Consejo Superior de Investigaciones Cientificas (CSIC))

Presentation materials