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Physics Letters B 712 (2012) 319-325
Study of the surrogate-reaction method applied to neutron-induced capture cross sections
G. Boutoux1, B. Jurado1, V. Méot2, O. Roig2, L. Mathieu1, M. Aïche1, G. Barreau1, N. Capellan1, I. Companis1, S. Czajkowski1, K.-H. Schmidt1, J.T. Burked, A. Bail2, J.M. Daugas2, T. Faul2, P. Morel2, N. Pillet2, C. Théroine2, X. Derkx3, O. Sérot4, I. Matéa5, L. Tassan-Got5

174Yb(3He,αγ )173Yb* and 174Yb(3He,pγ )176Lu*, respectively. For the first time, the gamma-decay probabilities have been obtained with two independent experimental methods based on the use of C6D6 scintillators and Germanium detectors. Our results for the radiative-capture cross sections are several times higher than the corresponding neutron-induced data. To explain these differences, we have used our gamma-decay probabilities to extract rather direct information on the spin distributions populated in the transfer reactions used. They are about two times wider and the mean values are 3 to 4 ¯h higher than the ones populated in the neutron-induced reactions. As a consequence, in the transfer reactions neutron emission to the ground and first excited states of the residual nucleus is strongly suppressed and gamma-decay is considerably enhanced.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  DAM/DIF - DAM Île-de-France
3 :  GANIL - Grand Accélérateur National d'Ions Lourds
4 :  DEN/DER/SPRC/LEPh - CEA-Cadarache
5 :  IPNO - Institut de Physique Nucléaire d'Orsay
Physique/Physique Nucléaire Expérimentale
Surrogate-reaction method – Neutron-induced capture cross section – Gamma-decay probability – Angular-momentum distribution