Investigations of three, four, and five-particle exit channels of levels in light nuclei created using a 9C beam

Details Investigations of three, four, and five-particle exit channels of levels in light nuclei created using a 9C beam Investigations of three, four, and five-particle exit channels of levels in light nuclei created using a 9C beam

2011-05-05

arxiv.org/abs/1105.1144v1

Phys.Rev.C84:014320,2011

Physics

Nuclear Physics

Nuclear Experiment

Scientific paper

10.1103/PhysRevC.84.014320

The interactions of a E/A=70-MeV 9C beam with a Be target was used to populate levels in Be, B, and C isotopes which undergo decay into many-particle exit channels. The decay products were detected in the HiRA array and the level energies were identified from their invariant mass. Correlations between the decay products were examined to deduce the nature of the decays, specifically to what extent all the fragments were created in one prompt step or whether the disintegration proceeded in a sequential fashion through long-lived intermediate states. In the latter case, information on the spin of the level was also obtained. Of particular interest is the 5-body decay of the 8C ground state which was found to disintegrate in two steps of two-proton decay passing through the 6Beg.s. intermediate state. The isobaric analog of 8Cg.s. in 8B was also found to undergo two-proton decay to the isobaric analog of 6Beg.s. in 6Li. A 9.69-MeV state in 10C was found to undergo prompt 4-body decay to the 2p+2alpha exit channel. The two protons were found to have a strong enhancementin the diproton region and the relative energies of all four p-alpha pairs were consistent with the 5Lig.s. resonance.

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