Li7(p,n)7

Abstract

At 200, 300, and 400 MeV bombarding energies, we measured cross section angular distributions for the Li(p, n) Be(g.s. +0.43 MeV) reaction and 0' cross sections for the ' C(p, n)' N(g. s.) reaction.Systematics of these reactions are presented.The center-of-mass cross section for the Li(p, n) Be(g.s. +0.43 MeV) reaction, when plotted as a function of momentum transfer, is nearly independent of energy. The laboratory cross section for this reaction at 0' in the energy range from 60 to 400 MeV is also independent of energy, having a constant value, to within experimental errors, of 35.5 mb/sr with an estimated uncertainty of +1.5 mb/sr.

Characterization of Hundreds of MeV 7Li(p,n) Quasi-Monoenergetic Neutron Source at RCNP Using a Proton Recoil Telescope and TOF Technique

“…Present results are shown in Fig. 5 together with our TOF data and other experimental data [7][8][9]. Our data obtained by different methods (PRT and TOF) were in agreement within the respective uncertainty and consistent with the other data which were nearly constant around 37 mb/sr.…”

“…The both data were not dependent on the incident proton energy and constant to be about 1 × 10 10 sr -1 C -1 . Peak cross section at 0° of 7 Li(p,n) reaction in LAB system in this study, our previous study [5], Baba et al [7], Watoson et al [8], and Taddeuchi et al [9]. The cross section for the peak neutron production, 7 Li(p,n 0,1 ) 7 Be, was deduced to compare with the experimental data measured by the other facilities.…”

Isospin symmetry in nucleon scattering fromLi6andCMildenberger1, Häusser2, Rg3 et al. 1990Phys. Rev. CSelf Cite11010View full textAdd to dashboardCite

“…For example, (p,n) cross sections are usually normalized to the "known" 7Li(p,n)7Be(g.s. + 429 keV first excited state) cross section at 0•‹, which is almost constant over a wide range of energies [28], but this cross section has an uncertainty of x 10% [29,19]; (n,p) measurements are usually normalized to the (n,p) phase-shift solution of Arndt and Roper [30]. Absolute (p,pl) measurements at these energies are (in principle) straightforward but are subject to significant systematic uncertainties, as will be explained later.…”

“…+ 429 keV first excited state) reaction. The 0" cross sections for this reaction have been obtained by Watson et a1 [28], who integrated the angular distribution at several energies between 198-400 MeV and normalized them to activation data by D'Auria e t a1 [29]. Instead of comparing (p,n) yields with the 7Li(p,n)7Be reaction, we make use of a novel method of comparisons between ratios of yields from (n,p) and (p,n) reactions for 6Li and 12C.…”

“…Center of mass cross sections for (p,p'), (n,p) and (p,n) reactions on 12C and 6Li are given in Table 3.2 and Table 3.3, respectively. T (MeV) lab Figure 3.11: 12C(p,n)12N cross sections from Watson et a1 [28] as a function of incident proton energy. All points have been extrapolated to 0".…”