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Non-resonant direct p- and d-wave neutron capture by 12C | | T. Kikuchi
; Y. Nagai
; T. S. Suzuki
; T. Shima
; T. Kii
; M. Igashira
; A. Mengoni
; T. Otsuka
; | | Date: |
17 Feb 1998 | | Journal: | Phys.Rev. C57 (1998) 2724-2730 | | Subject: | nucl-th | | Affiliation: | Tokyo Institute of Technology - RIKEN - ENEA - University of Tokyo | | Abstract: | Discrete gamma-rays from the neutron capture state of 13C to its low-lying bound states have been measured using pulsed neutrons at En = 550 keV. The partial capture cross sections have been determined to be 1.7+/-0.5, 24.2+/-1.0, 2.0+/-0.4 and 1.0+/-0.4 microb for the ground (1/2-), first (1/2+), second (3/2-) and third (5/2+) excited states, respectively. From a comparison with theoretical predictions based on the non-resonant direct radiative capture mechanism, we could determine the spectroscopic factor for the 1/2+ state to be 0.80 +/- 0.04, free from neutron-nucleus interaction ambiguities in the continuum. In addition we have detected the contribution of the non-resonant d-wave capture component in the partial cross sections for transitions leading to the 1/2- and 3/2- states. While the s-wave capture dominates at En < 100 keV, the d-wave component turns out to be very important at higher energies. From the present investigation the 12C(n,gamma)13C reaction rate is obtained for temperatures in the range 10E+7 - 10E+10 K. | | Source: | arXiv, nucl-th/9802051 | | Services: | Forum | Review | PDF | Favorites | |
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