Measurement of Charged-Particle Emission Double-Differential Cross Section of Fluorine for 14.2 MeV Neutrons

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

来源：Journal of Nuclear Science and Technology, 2011, 48(8): 1146-1157.

DOI：10.3327/jnst.48.1146

• double-differential cross section
• 14 MeV neutron
• charged particle
• fluorine
• fusion reactor
• FLiBe
• direct reaction process
• pre-equilibrium process

We carried out detailed measurement of the double-differential cross sections of fluorine for the emissions of protons, deuterons, tritons, and alpha-parlicles with 14.2 MeV incident neutrons. An improved charged-particle spectrometer with a pencil DT-neutron beam furnished at the FNS facility of the Japan Atomic Energy Agency enabled us to obtain precise data with a fine energy resolution over a wide energy range and an angular range from 15 to 150. The present experiment is the first simultaneous measurement of the four different kinds of charged particles and provides useful data to establish a nuclear reaction model of fluorine as well as to confirm previous experimental data. Angular-differential cross sections for several discrete peaks corresponding to excited states of residual nuclei were extracted to discuss the reaction mechanism of charged-particle emission. The obtained data suggest that the charged-particle emission reaction of fluorine has a complicated mechanism in which there are contributions from the direct reaction, pre-equilibrium, and equilibrium processes. The obtained data were compared with the nuclear data evaluated in JENDL-3.3 and ENDF/B-VII.0. The results show large differences in the energy and angular distributions of emitted particles and the charged-particle production cross sections between the measured and evaluated data.

• 出版日期2011-8