Speaker
Description
The neutron production double-differential cross sections (DDX) from thin $^{nat}$C, $^{93}$Nb and $^{209}$Bi targets bombarded by 290 MeV/u $^{136}$Xe ions were measured by using the Heavy Ion Medical Accelerator in Chiba (HIMAC) facility of National Institute of Radiological Sciences (NIRS), Japan. The NE213 liquid organic scintillators were placed at the angles of 15°, 30°, 45°, 60°, 75° and 90° to measure DDX. We used the inverse time-of-flight method to obtain energy distribution of neutrons. By integrating the DDX over the incident neutron energies, the differential cross sections were measured. The background neutron events generated by projectiles which collide with air after passing through the target were estimated by Monte-Carlo simulation. The contribution to the DDX due to the background events was removed by using Monte-Carlo simulation codes, GEANT4, MCNP and PHITS. The experimental double differential cross sections are compared with the simulation results with or without the removal of the background events due to the collision of heavy ions with the air.
