159 articles – 2004 Notices  [english version]
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2nd Workshop on "State of the Art in Nuclear Cluster Physics" (SOTANCP2), Bruxelles : Belgique (2010)
Probing pre-formed alpha particles in the ground state of nuclei
J.A. Scarpaci1, M. Fallot1, 2, D. Lacroix3, M. Assié1, L. Lefebvre1, N. Frascaria1, D. Beaumel1, C. Bhar1, Y. Blumenfeld1, A. Chbihi3, Ph. Chomaz3, 4, P. Désesquelle1, 5, J. Frankland3, H. Idbarkach1, E. Khan1, J.L. Laville3, E. Plagnol1, 6, E.C. Pollacco4, P. Roussel-Chomaz3, 7, J.C. Roynette1, A. Shrivastava1, T. Zerguerras1

In this proceeding we report on alpha particle emission through the nuclear break-up in the reaction 40Ca on a 40Ca target at 50A MeV. It is observed that alpha particles are emitted to the continuum with very specific angular distribution during the reac- tion. The alpha particle properties seem to be compatible with an alpha cluster in the daughter nucleus that is perturbed by the short range nuclear attraction of the collision partner and emitted as described by a time-dependent theory. This mechanism offers new possibilities to study alpha particle properties in the nuclear medium.
1 :  IPNO - Institut de Physique Nucléaire d'Orsay
2 :  SUBATECH - Laboratoire SUBATECH Nantes
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
4 :  IRFU - Institut de Recherches sur les lois Fondamentales de l'Univers (ex DAPNIA)
5 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
6 :  APC - UMR 7164 - AstroParticule et Cosmologie
7 :  CEA/DSM - CEA/DSM Centre de Saclay
APC - Cosmologie et gravitation
Physique/Physique Nucléaire Expérimentale