Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2006-11-14
Nucl.Phys.A784:49-78,2007
Physics
Nuclear Physics
Nuclear Theory
43 pages, 13 figures, 5 tables. Accepted for publication on Nucl. Phys. A
Scientific paper
10.1016/j.nuclphysa.2006.11.033
We present a simple time dependent model for the excitation of a nucleon from a bound state to a continuum resonant state in a neutron-core complex potential which acts as a final state interaction. The final state is described by an optical model S-matrix so that both resonant and non resonant states of any continuum energy can be studied as well as deeply bound initial states. It is shown that, due to the coupling between the initial and final states, the neutron-core free particle phase shifts are modified, in the exit channel, by an additional phase. The effect of the additional phase on the breakup spectra is clarified. As an example the population of the low energy resonances of $^{11}$Be and of the unbound $^{13}$Be is discussed. Finally, we suggest that the excitation energy spectra of an unbound nucleus might reflect the structure of the parent nucleus from whose fragmentation they are obtained.
Blanchon Guillaume
Bonaccorso Alessandro
Brink David M.
García-Camacho A.
Mau Nicole Vinh
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