Measurement of Neutron Yields from Thick Al and SUS304Targets Bombarded by 5-MeV and 9-MeV Deuterons

Abstract

Double differential thick target neutron yields from 5and 9 MeV deuteron incidence on aluminum and SUS304st ainless steel were measured at the Kyushu University Tandem Accelerator Laboratory. An aluminum, and a SUS 304 foil which were thick enough for a deuteron to stop in the foils were placed at the center of a vacuum chamber. AnNE213 liquid organic scintillator was employed to detect neutrons emitted from targets. To consider the contribution of scattered neutrons from the floor, we also measured neutron yields with an iron shadow bar located in front of the scintillator. Because incident deuteron beam was not pulsed and the Time-of-Flight method was not applied, the energy spectrum was derived from unfolding the light output spectrum using the FORIST code. The re sponse function of the detector was calculated with the SCINFUL-QMD code. The experimental results were compared with the calculation data of the TALYS and PHITS code, and it turned out that the calculation data does not reproduce the experimental ones satisfactorily.

Measurement of Double Differential Neutron Yields from Thick Aluminum Target Irradiated by 9 MeV Deuteron

“…The error bars of the spectra include both the statistical error and the uncertainty caused by FORIST unfolding. Individual systematic errors were estimated in the same way as described in [11]: (a) determination of the solid angles and angular offset of the beam (3.2%), (b) the uncertainty in the n-discrimination (5%), (c) the accuracy of response function calculated by SCINFUL-QMD (17%), and (d) the effect of neutrons scattered by materials and air (4%). The total systematic error amounts to be 18.5% by error propagation.…”

“…The PHITS calculations using INCL model are compared with the measured DDTTNYs at 9MeV, 5 MeV [11] and 40 MeV [12] in Figs. 5 to 7, respectively.…”

“…Details of the experimental set up have been reported in Refs [9,10,11]. The experiments were carried out at the 1st target room in the Kyushu University Tandem accelerator Laboratory (KUTL).…”

“…Several experimental data related to neutron source targets such as lithium, beryllium and carbon were measured [5,6,7,8], however, there are few data for accelerator structure material targets such as iron, aluminum, copper and others. Recently, systematic measurements of double differential thick target neutron yields (DDTTNYs) for several targets have been performed in Kyushu University [9,10,11]: carbon, titanium, cupper and niobium at 5 and 9 MeV, but aluminum only at 5 MeV. There are available DDTTNYs at 40 MeV for carbon and aluminum measured in Tohoku University [12].…”

“…Neutron spectra from a thick aluminum target bombarded by 5 MeV deuterons at five laboratory angles reported in Ref [11]. compared with PHTIS calculations using the INCL model.…”