Study on neutron beam probe; Study on the focused neutron beam

Kotajima, Kyuya*; Suzuki, Kazuyuki*; Fujisawa, Masanori*; Takahashi, T.*; Sakamoto, I.*; Wakabayashi, Toshio

A monoenergetic focused neutron beam has been produced by utilizing the endoenergetic heavy ion reactions on hydrogen. To realize this, the projectile heavy ion energy should be taken slightly above the threshold energy, so that the excess energy converted to the neutron energy should be very small. In order to improve the capability of the focused neutron beam. Some hydrogen stored metal targets have also been tested. Separating the secondary heavy ions (as sosicated particles) from the primary ions (accelerated particles) by using a dipole magnet, a rf separator ,and a particle identification system, we could directly count the produced neutrons. This will leads us to the possibility of realizing the standard neutron field which had been the empty dream of many neutron-related researchers in the world.