Study of the surrogate-reaction method applied to neutron-induced capture cross sections

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• 作者：G. Boutoux^a ; ^b ; B. Jurado^a ; ^b ; ^{jurado@cenbg.in2p3.fr} ; V. Mé ; ot^c ; O. Roig^c ; L. Mathieu^a ; ^b ; M. Aï ; che^a ; ^b ; G. Barreau^a ; ^b ; N. Capellan^a ; ^b ; I. Companis^a ; ^b ; S. Czajkowski^a ; ^b ; K.-H. Schmidt^a ; ^b ; J.T. Burke^d ; A. Bail^c ; J.M. Daugas^c ; T. Faul^c ; P. Morel^c ; N. Pillet^c ; C. Thé ; roine^c ; X. Derkx^e ; O. Sé ; rot^f ; I. Maté ; a^g ; L. Tassan-Got^g
• 关键词：Surrogate-reaction method ; Neutron-induced capture cross section ; Gamma-decay probability ; Angular-momentum distribution
• 刊名：Physics Letters B
• 出版年：2012
• 期刊代码：58_03702693
• 类别：ph
• 出版时间：12 June, 2012
• 卷：712
• 期：4-5
• 页码：319-325
• 文件大小：1015 K

摘要

Gamma-decay probabilities of ¹⁷³Yb and ¹⁷⁶Lu have been measured using the surrogate reactions ¹⁷⁴Yb(³He,伪纬)¹⁷³Yb* and ¹⁷⁴Yb(³He,p纬)¹⁷⁶Lu*, respectively. For the first time, the gamma-decay probabilities have been obtained with two independent experimental methods based on the use of Cb>6b>Db>6b> 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 鈩?/em> 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.