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

Abstract

We carried out detailed measurement of the double-differential cross sections of fluorine for the emissions of protons, deuterons, tritons, and -particles 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.

Calculations of neutron-induced alpha emission double-differential cross section of Flourine at 14.2 MeV

“…Similar to the 45°, ALICE results are in general agreement with experimental data especially between 4 MeV and 12 MeV. [14]. Both theoretical cross section data calculated by EMPIRE-3.2 and ALICE codes from 3 MeV to 11 MeV are approximately close agreement with experimental data.…”

“…1. In Fig 1, we compared our double differential cross section calculations with the experimental data of Kondo et al [14]. Theoretical double differential cross section calculations from ALICE code are close agreement with experimental data by Kondo et al [14] especially at the continuum from 4 to 11 MeV while EMPIRE results are similar with experimental data between 4 and 7 MeV.…”

“…In Fig 1, we compared our double differential cross section calculations with the experimental data of Kondo et al [14]. Theoretical double differential cross section calculations from ALICE code are close agreement with experimental data by Kondo et al [14] especially at the continuum from 4 to 11 MeV while EMPIRE results are similar with experimental data between 4 and 7 MeV. The calculated double differential cross section alpha emission spectra comparing with the experimental data by Terada et al [15] at emission angle of 60° and for 14.2 MeV incident neutron energy are given in Fig.…”

“…1-6, respectively. The experimental data for 19 F(n,xa) in literature are taken from Kondo et al [14], Terada et al [15] with using the EXFOR library [16].…”

“…Molten salt reactors are a good neutron moderator characterized by the use of fluoride salts as reactor coolant [1,2]. Florine and its compounds have been used widely for the nuclear applications such as processing nuclear fuel [3]. Double differential cross sections are very important for the neutronics design of fusion reactors.…”