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Excitation function shape and neutron spectrum of the 7Li (p,n) 7Be reaction near threshold

AuthorsMartín-Hernández, Guido; Mastinu, Pierfrancesco; Praena, Javier ; Capote-Noy, Roberto
Issue Date2016
PublisherAmerican Physical Society
CitationPhysical Review C 94(3): 034620 (2016)
AbstractThe forward-emitted low energy tail of the neutron spectrum generated by the Li7(p,n)Be7 reaction on a thick target at a proton energy of 1893.6 keV was measured by time-of-flight spectroscopy. The measurement was performed at BELINA (Beam Line for Nuclear Astrophysics) of the Laboratori Nazionali di Legnaro. Using the reaction kinematics and the proton on lithium stopping power the shape of the excitation function is calculated from the measured neutron spectrum. Good agreement with two reported measurements was found. Our data, along with the previous measurements, are well reproduced by the Breit-Wigner single-resonance formula for s-wave particles. The differential yield of the reaction is calculated and the widely used neutron spectrum at a proton energy of 1912 keV was reproduced. Possible causes regarding part of the 6.5% discrepancy between the Au197(n,γ) cross section measured at this energy by Ratynski and Kappeler [Phys. Rev. C 37, 595 (1988)PRVCAN0556-281310.1103/PhysRevC.37.595] and the one obtained using the Evaluated Nuclear Data File version B-VII.1 are given.
Descriptionet al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevC.94.034620
Identifiersdoi: 10.1103/PhysRevC.94.034620
issn: 2469-9985
e-issn: 2469-9993
Appears in Collections:(CNA) Artículos
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