HAL : in2p3-00189007, version 1

DOI : 10.1016/j.nima.2008.01.059

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Nuclear Instruments and Methods in Physics Research Research: Accelerators, Spectrometers, Detectors and Associated Equipment 587 (2008) 292-299

A new device for combined Coulomb excitation and isomeric conversion electron spectroscopy with fast fragmentation beams

E. Clément1, 2, A. Görgen1, W. Korten1, A. Bürger1, 3, A. Chatillon1, Y. Le Coz1, Ch. Theisen1, M. Zielinska1, B. Blank4, P.J. Davies5, S.P. Fox5, J. Gerl6, G. Georgiev2, S. Grévy2, J. Iwanicki7, D.G. Jenkins5, F. Johnston-Theasby5, P. Joshi5, I. Matea4, P.J. Napiorkowski7, F. de Oliveira Santos2, M.G. Pellegriti2

(2008)

A new setup has been designed to perform Coulomb excitation experiments with fragmentation beams at intermediate energy and to measure at the same time conversion electrons from isomeric states populated in the fragmentation reaction. The newly designed setup is described and experimental results from a first experiment are shown. Radioactive even-even nuclei in the mass region A ≃ 70 close to the N = Z line were Coulomb excited after fragmentation of an intense primary $^{78}$Kr beam and selection in flight with the LISE3 spectrometer at GANIL. The rays emitted after Coulomb excitation were detected in an array of four large segmented HPGe clover detectors in a very close geometry. The scattered ions were identified in a stack of highly segmented annular silicon detectors combined with a time-of-flight measurement using beam tracking detectors. Conversion electrons from isomeric $0^+_2$ states decaying via electric monopole transitions were detected in an array of segmented cooled silicon detectors surrounding a telescope of plastic scintillators. Reduced transitions probabilities B(E2; $0^+_1$ → $2^+_1$ ) were deduced for several stable and radioactive nuclei.

1 :	DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
2 :	GANIL - Grand Accélérateur National d'Ions Lourds
3 :	Helmholtz-Institut für Strahlen- und Kernphysik
4 :	CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
5 :	Department of Physics
6 :	GSI - Gesellschaft für Schwerionenforschung mbH
7 :	Heavy Ion Laboratory

Thème(s)

:

Physique/Physique Nucléaire Expérimentale

Mot(s)-clé(s) : Coulomb excitation – electromagnetic transition probability – conversion-electron spectroscopy – E0 transitions – SISSI device

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Contributeur : Michel Lion <>

Soumis le : Lundi 19 Novembre 2007, 17:31:46

Dernière modification le : Mercredi 2 Juillet 2008, 16:34:01