Differential cross section for neutron scattering from Bi209 at 37 MeV and the weak particle-core coupling

Zuying Zhou, Xichao Ruan, Yanfeng Du, Bujia Qi, Hongqing Tang, Haihong Xia, R. L. Walter, R. T. Braun, C. R. Howell, W. Tornow, G. J. Weisel, M. Dupuis, J. P. Delaroche, Zemin Chen, Zhenpeng Chen, Yingtang Chen

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Abstract

Differential scattering cross-section data have been measured at 43 angles from 11° to 160° for 37-MeV neutrons incident on Bi209. The primary motivation for the measurements is to address the scarcity of neutron scattering data above 30 MeV and to improve the accuracy of optical-model predictions at medium neutron energies. The high-statistics measurements were conducted at the China Institute of Atomic Energy using the H3(d,n)He4 reaction as the neutron source, a pulsed deuteron beam, and time-of-flight (TOF) techniques. Within the resolution of the TOF spectrometer, the measurements included inelastic scattering components. The sum of elastic and inelastic scattering cross sections was computed in joint optical-model and distorted-wave Born approximation calculations under the assumption of the weak particle-core coupling. The results challenge predictions from well-established spherical optical potentials. Good agreement between data and calculations is achieved at 37 MeV provided that the balance between surface and volume absorption in a recent successful model is modified, thus suggesting the need for global optical-model improvements at medium neutron energies.

Original languageEnglish (US)
Article number024601
JournalPhysical Review C - Nuclear Physics
Volume82
Issue number2
DOIs
StatePublished - Aug 3 2010

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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