Experimental determination of the Be+p scattering lengths
2003; Elsevier BV; Volume: 716; Linguagem: Inglês
10.1016/s0375-9474(02)01584-1
ISSN1873-1554
AutoresC. Angulo, M. Azzouz, P. Descouvemont, G. Tăbăcaru, D. Baye, M. Cogneau, M. Couder, T. Davinson, A. Di Pietro, П. Фігуера, M. Gaelens, P. Leleux, M. Loiselet, A. Ninane, F. de Oliveira Santos, R. G. Pizzone, G. Ryckewaert, N. de Séréville, F. Vanderbist,
Tópico(s)Astronomical and nuclear sciences
ResumoThe 7Be+p elastic cross section has been measured at the Centre de Recherches du Cyclotron RIB facility at Louvain-la-Neuve in the c.m. energy region from 0.3 to 0.75 MeV by bombarding a proton-rich target with a radioactive 7Be beam. The recoil protons have been detected in the angular range θc.m.=120.2°–131.1° and θc.m.=156.6°–170.2° using the LEDA system. From a R-matrix analysis of the cross section data, we obtain the energy and the width of the 1+ resonance (Ex=0.77 MeV). The ℓ=0 scattering lengths a01=25±9 fm (channel spin I=1) and a02=−7±3 fm (channel spin I=2) have been deduced. They are compared to values expected from charge-symmetry properties. Implications on the low energy S-factor of the 7Be(p,γ)8B reaction are discussed.
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