Fast timing: Lifetime measurements with LaBr(3) scintillators

I. Deloncle (1) , B. Roussiere (2) , M.A. Cardona , D. Hojman , J. Kiener (1) , P. Petkov , D. Tonev , T. Venkova

1 CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
2 IPNO - Institut de Physique Nucléaire d'Orsay

In order to perform half-life measurements at Alto, we developed a fast-timing setup using fast scintillators : LaBr(3). The main components of our setup and their characteristics (timing properties) are presented. The resulting time resolution, obtained after optimization, and measured off-line with radioactive sources is discussed. This set-up was tested on-line by measuring using the slope method half-lives of (137-138)CS levels fed by the beta(-) decay of (137-138)Xe. The neutron-rich Xe nuclei were produced by (238)U photofission using, at low intensity, the electron beam and the line of the future facility ALTO. Our results show the ability of such a fast-timing system to measure half-lives lower than the total time resolution. Off-line and on-line results are discussed.

Mots clés: PHOTOMULTIPLIER; RESOLUTION; DETECTORS

Domaines: Physique Nucléaire Expérimentale [nucl-ex]

I. Deloncle, B. Roussiere, M.A. Cardona, D. Hojman, J. Kiener, et al.. Fast timing: Lifetime measurements with LaBr(3) scintillators. XVIII INTERNATIONAL SCHOOL ON NUCLEAR PHYSICS, NEUTRON PHYSICS AND APPLICATIONS, Sep 2009, Varna, Bulgaria. pp.012044, ⟨10.1088/1742-6596/205/1/012044⟩. ⟨in2p3-00610370⟩