resonances

Neutron decay of excited states in21Ne populated in the12C(13C,21Ne)4He reaction

“…The present data provide a link between the states reported in the high-resolution measurements of the 13 C( 12 C, 4 He) [6] and 20 Ne(n, n) [7,8] reactions. In [6] it was clearly shown that the mechanism for the 13 C( 12 C, 4 He) reaction is compound in nature.…”

“…In [6] it was clearly shown that the mechanism for the 13 C( 12 C, 4 He) reaction is compound in nature. The present tabulations of 21 Ne states above 7 MeV [5] associate the states observed in the compound reaction with typical spins 5/2 to 11/2, whereas the resonances observed in the resonant neutron scattering [7,8] are typically low spin, 1/2 or 3/2. In the present data, states which neutron decay to the 20 Ne ground state are unlikely to be associated with high-spin as there would be a significant centrifugal barrier.…”

“…Due to the finite resolution, the complexity revealed by the earlier high-resolution measurements [6] is not fully accounted for and single Gaussian peaks will contain unresolved contributions. The states which could be identified in this analysis are listed in tables 1 and 2, together with the adopted values from [5] and measurements made of the 13 C( 12 C, 4 He) [6] and 20 Ne(n,n) [7,8] reactions. The magnitude of the fitted peaks is indicated by the 'strength', which is normalized to the area of the ground-state peak.…”

“…In the region above the neutron decay threshold (E x = 6.76 MeV), this has led to the states populated in the 12 C( 13 C,α) reaction being identified with high spin. In the same energy region, resonances observed in the 20 Ne(n, n) reaction [7,8] have been associated with low spin states. In this paper, we present a measurement of the population of the 21 Ne states via the 12 C( 13 C,α) reaction and their subsequent decay properties to try to resolve the above discrepancy.…”

High-resolution resonance study of the12C+n total cross section in the region of13CT=3/2 states

“…A great number of T= 3/2, T~ = -1/2 states have been investigated in high-resolution proton-resonance studies on target nuclei with mass A = 4 n from 12C to 4~ ELM]. As far as the mirror T=3/2, Tz = +1/2 resonances are concerned, high-resolution neutron-resonance studies have been performed on target nuclei 160, 2~ 28Si and 32S [5][6][7][8][9]. The only missing member in this series of light nuclei is the system 12C + n-* 13 C (T= 3/2).…”