Probing pre-formed alpha particles in the ground state of nuclei

Details Probing pre-formed alpha particles in the ground state of nuclei Probing pre-formed alpha particles in the ground state of nuclei

2010-05-21

arxiv.org/abs/1005.3969v1

Physics

Nuclear Physics

Nuclear Experiment

4 pages, 3 figures

Scientific paper

In this Letter, 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, similarly to nucleons, alpha particles can be emitted to the continuum with very specific angular distribution during the reaction. The alpha particle properties can be understood as resulting from an alpha cluster in the daughter nucleus that is perturbed by the short range nuclear attraction of the collision partner and emitted. A time-dependent theory that describe the alpha particle wave-function evolution is able to reproduce qualitatively the observed angular distribution. This mechanism offers new possibilities to study alpha particle properties in the nuclear medium.

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