Li7(p,n0)<

A miniature thermal neutron source using high power lasers

“…The proton beam produced by the TNSA mechanism exhibits a quasi-Maxwellian energy spectrum. Hence the large population of few-MeV protons generates large numbers of sub-MeV neutrons near the threshold of the endothermic 7 Li(p,n) 7 Be reaction [25][26][27]. These neutrons can be efficiently moderated to thermal energies, compared to the multi-MeV neutrons which drive the thermal neutron sources at the spallation facilities.…”

“…The plastic scintillators cannot provide information on the spectrum for sub-MeV neutrons, due to their low sensitivity in this energy range. However, one could expect the neutrons produced by the near-threshold reaction of 7 Li to peak around hundreds of keV with a tail of distribution extending down to keV energies [25][26][27], as shown in Fig. 2(a).…”

Measurement of theH2(n,γ)Nagai1, Kobayashi2, Shima3 et al. 2006Phys. Rev. C

“…Hence, they do not hit the spectrometer directly and thus the above-mentioned shield is good enough to attenuate the events due to the scattered neutrons. However, when the neutron energy is as high as ∼500 keV, the neutrons are emitted from the Li target position in a larger cone with respect to the proton beam direction compared to the cone for the low-energy keV neutrons [19]. Consequently, the high-energy neutrons can be directly captured by 127 I in the NaI(Tl) spectrometer, producing a (6.8 + E c.m. )…”

Concentration Profiling of Boron in Solids by Neutron Time-of-Flight

“…-nB N(t)dt = a(e) n; e N dEpdQ, (1) where o(0) is the differential reaction cross section, ef is the neutron detection efficiency, and Np is the number of protons incident during the measurement. The reciprocal of the atomic stopping cross section per ''B atom is contained within the square brackets, where the summation extends over target constitutents, each with a number density n. and stopping cross section £j.…”