Low-energy M1 strength in the Li-7(p,gamma_0)Be-8 reaction

Details Low-energy M1 strength in the Li-7(p,gamma_0)Be-8 reaction Low-energy M1 strength in the Li-7(p,gamma_0)Be-8 reaction

1996-03-13

arxiv.org/abs/nucl-th/9603014v1

Nucl.Phys. A607 (1996) 62-71; Erratum-ibid. A609 (1996) 601

Physics

Nuclear Physics

Nuclear Theory

Scientific paper

10.1016/S0375-9474(96)88941-X

The Li-7(p,gamma_0)Be-8 reaction is studied in a microscopic cluster model. All relevant subsystem properties are well reproduced. The calculated astrophysical S factor is in good agreement with the experimental data, although some M1 strength is missing in the 1+;1 resonance region. There is no contribution from the 1+;0 state. We estimate an M1 strength of 3.5% at 80 keV. By assuming the experimental resonance parameters and channel spin ratio for the first 1+ state that M1 strength is 6.3%, in good agreement with an R matrix analysis. The large (20%) M1 strength determined from a transition matrix element analysis may be caused by assuming a vanishing 0p3/2 spectroscopic factor, which is not supported by shell model calculations.

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