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Measurement and analysis of neutron-induced alpha particle emission double-differential cross section of carbon at 14.2 MeV

Kondo, Keitaro; Murata, Isao*; Ochiai, Kentaro; Kubota, Naoyoshi*; Miyamaru, Hiroyuki*; Konno, Chikara  ; Nishitani, Takeo

We carried out a detailed measurement of neutron induced $$alpha$$-particle emission double-differential cross-section of carbon at 14.2 MeV, for which there were few measured data in spite of its importance in many applications. The obtained cross-section for the $$^{12}$$C(n,$$alpha_{0}$$)$$^{9}$$Be$$_{(ground state)}$$ reaction agreed well with previous experiments and evaluated nuclear data. The obtained angular-differential cross-section of the $$^{12}$$C(n,n'+3$$alpha$$) reaction for $$alpha$$-particles showed a strong forward-peaked distribution that suggested significant contribution of the direct reaction process to the 3$$alpha$$ breakup. We attempted to calculate the emitted particle spectra by means of a Monte Carlo method and estimate the branching ratio of the channels which contribute to the $$^{12}$$C(n,n'+3$$alpha$$) reaction. As a result, it was found that the $$^{12}$$C(n,$$alpha$$)$$^{9}$$Be* channels play an important role in generating the experimental double-differential cross-section both of emitted $$alpha$$-particles and neutrons. The estimated ratio of the $$^{12}$$C(n,$$alpha$$)$$^{9}$$Be* channels was around 40%, somewhat larger than those evaluated in previous studies.

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Category:Nuclear Science & Technology

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