Resonance states of ^{5}H and ^{5}Be in a microscopic threecluster model
Abstract
Resonance states of ^{5}H and ^{5}Be have been studied using microscopic t+n+n and h+p+p threecluster models, respectively. The resonance positions are localized by the threebody complex scaling method. An effective nucleonnucleon interaction, which reproduces the α+N low energy phase shifts and the energies of the 0^{+} ground and 2^{+} first excited states of ^{6}He with the threecluster model, is used to calculate resonance states of ^{5}H and ^{5}Be. This model can reasonably reproduce the experimental t+n and h+p phase shifts at low energies. It gives a 1/2^{+} broad resonance as the ground state in ^{5}H and ^{5}Be and in addition it gives two excited resonance states of 3/2^{+} and 5/2^{+}. The resonance parameters of the 1/2^{+} state of ^{5}H in the present model are close to those deduced from their recent experimental data by Korsheninnikov et al. The same effective nucleonnucleon interaction is used for a tentative investigation in order to explore the possibility of a tetraneutron (^{4}n) resonance by means of the n+n+n+n fourbody complex scaling method on a restricted set of model configurations. Our model does not give any evidence for a tetraneutron resonance.
 Publication:

Physical Review C
 Pub Date:
 September 2003
 DOI:
 10.1103/PhysRevC.68.034303
 Bibcode:
 2003PhRvC..68c4303A
 Keywords:

 27.10.+h;
 21.10.Dr;
 21.60.Gx;
 A<
 =5;
 Binding energies and masses;
 Cluster models