Secondary Neutron-Production Cross Sections from Heavy-Ion Interactions between 230 and 600 MeV/Nucleon

Abstract

-Secondary neutron-production cross-sections have been measured from interactions of 230 MeV/nucleon He, 400 MeV/nucleon N, 400 MeV/nucleon Kr, 400MeV/nucleon Xe, 500 MeV/nucleon Fe, and 600 MeV/nucleon Ne interacting in a variety of elemental and composite targets. We report the double-differential production cross sections, angular distributions, energy spectra, and total cross sections from all systems. Neutron energies were measured using the time-of-flight technique, and were measured at laboratory angles between 5° and 80°. The spectra exhibit behavior previously reported in other heavy-ion-induced neutron production experiments; namely, a peak at forward angles near the energy corresponding to the beam velocity, with the remaining spectra generated by preequilibrium and equilibrium processes. The doubledifferential spectra are fitted with a moving-source parameterization. Observations on the dependence of the total cross sections on target and projectile mass are discussed.

MCNP6 Simulation of Reactions of Interest to FRIB, Medical, and Space Applications

“…Similar results were obtained ( see [5]) with the production version of MCNP6 for other measurements published in [7,8]. Our current good results obtained with the production version of MCNP6 for the measurements published in [7,8] make questionable to us the quite poor results by a version of LAQGSM used in a version of MCNPX and even worse results published in Ref. [6] by MARS15 using a version of LAQGSM.…”

“…We have tested with the production version of MCNP6 [2] almost all neutron spectra measured at the Heavy Ion Medical Accelerator in the Chiba (HIMAC) facility of the National Institute of Radiological Science (NIRS) [7,8]. Most of our results on this work have been published in [5].…”

Benchmarking Heavy Ion Transport Codes FLUKA, HETC-HEDS MARS15, MCNPX, and PHITS

“…Neutron double differential cross sections were generated in control detectors representing the seven neutron detectors used in the experiment. % range, with larger uncertainties typically observed at the highest and the lowest energies at each angle; details can be found in References [21] and [32]. …”

“…The measured data (Exp) are from the study of Heilbronn et al [32]. Calculations were performed using the HIC 1 model with the HETC-HEDS code (red line) [9], the LAQGSM code (green line) [20] and the MCNPX 2.7b code (black line) [8] Figure 6-10.…”

“…Measured and calculated double-differential neutron spectra at 80 degrees from 600 MeV/nucleon 28 Si on 0.4-cm-thick Cu target. The measured data (Exp) are from the study of Heilbronn et al [32]. Calculations were performed using the HIC 1 model with the HETC-HEDS code (red line) [9], and the LAQGSM code (green line) [20] Figure 6-26.…”