Measurements of double differential neutron production cross sections by 135 MeV/nucleon He, C, Ne and 95 MeV/nucleon Ar ions - art. no. 034607

The double differential cross sections of neutron production from thin C, A l, Cu, and Pb targets bombarded by 135 MeV/nucleon He, C, and Ne ions and b y 95 MeV/nucleon Ar ion were measured using the RIKEN Ring Cyclotron of the Institute of Physical and Chemical Research, Japan. The neutron energy spe ctra at 0 degrees, 15 degrees, 30 degrees, 50 degrees', 80 degrees, and 110 degrees were obtained by using the time-of-flight method. The neutron spec tra in the forward direction have a sharp peak that is located at the incid ent particle energy per nucleon due to the knockon process, and spreads out to about three times the incident particle energy per nucleon. The resulta nt spectra were integrated over energy to produce neutron angular distribut ions. The total neutron production cross sections were obtained by integrat ing over the angular distributions. The experimental results are compared w ith calculations using the intranuclear cascade-evaporation Monte Carlo cod e HIC and the quantum molecular dynamics code QMD.