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Characterization of a 40–90 MeV 7Li(p,n) neutron source at TIARA using a proton recoil telescope and a TOF method

1999; Elsevier BV; Volume: 428; Issue: 2-3 Linguagem: Inglês

10.1016/s0168-9002(99)00161-8

1872-9576

Mamoru Baba, Yasushi Nauchi, Tomohiko IWASAKI, Takehide Kiyosumi, Miki Yoshioka, S. Matsuyama, Naohiro HIRAKAWA, T. Nakamura, Su. Tanaka, Shin-ichiro Meigo, Hiroshi Nakashima, Sh. Tanaka, Noriaki Nakao,

Nuclear reactor physics and engineering

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.