Author/Authors :
Baba، نويسنده , , M. and Nauchi، نويسنده , , Y. and Iwasaki، نويسنده , , T. and Kiyosumi، نويسنده , , T. and Yoshioka، نويسنده , , M. and Matsuyama، نويسنده , , S. and Hirakawa، نويسنده , , N. and Nakamura، نويسنده , , T. and Tanaka، نويسنده , , Su. and Meigo، نويسنده , , S. and Nakashima، نويسنده , , H. and Tanaka، نويسنده , , Sh. and Nakao، نويسنده , , N.، نويسنده ,
Abstract :
The intensity and energy spectra of a quasi-monoenergetic 7Li(p,n) neutron source at TIARA of Japan Atomic Energy Research Institute (JAERI) have been measured for eight incident proton energies between 43 and 87 MeV, using a proton recoil telescope (PRT) of annular geometry and a time-of-flight (TOF) method employing organic scintillators (BC501A, NE213) calibrated prior to the experiment. By combining the two data, we deduced energy spectra of the source neutrons absolutely down to a few MeV, and the cross section of the peak neutron production reaction, 7Li(p,n0,1)7Be. The continuum component of the energy spectrum in the source proved to be described consistently by assuming a three-body phase-space distribution corresponding to the 7Li(p,n3He)α reaction as a main component. The annular PRT achieved a good compromise between energy resolution and detection efficiency with a good signal-to-noise ratio.
