Quasi-monoenergetic neutron energy spectra for 246 and 389 MeV Li(p,n) reactions at angles from 0 to 30

Iwamoto, Yosuke   ; Hagiwara, Masayuki*; Satoh, Daiki   ; Iwase, Hiroshi*; Yashima, Hiroshi*; Itoga, Toshiro*; Sato, Tatsuhiko   ; Nakane, Yoshihiro  ; Nakashima, Hiroshi; Sakamoto, Yukio; Matsumoto, Tetsuro*; Masuda, Akihiko*; Nishiyama, Jun*; Tamii, Atsushi*; Hatanaka, Kichiji*; Theis, C.*; Feldbaumer, E.*; Jaegerhofer, L.*; Pioch, C.*; Mares, V.*

The authors measured the neutron energy spectra of a quasi-monoenergetic Li(p,n) neutron source with 246 and 389 MeV protons set at seven angles (0, 2.5, 5, 10, 15, 20 and 30), using a time-of-flight (TOF) method employing organic scintillators NE213 at the Research Center for Nuclear Physics (RCNP) of Osaka University. The energy spectra of the source neutrons were precisely deduced down to 2 MeV at 0 and 10 MeV at other angles. The cross sections of the peak neutron production reaction at 0 were on the 35-40 mb line of other experimental data, and the peak neutron angular distribution agreed well with the Taddeucci formula. Neutron energy spectra below 100 MeV at all angles were comparable, but the shapes of the continuum above 150 MeV changed considerably with the angle.