Excitation function shape and neutron spectrum of the Li7(p,n)Be7 reaction near threshold

Guido Martín-Hernández, Pierfrancesco Mastinu, Mario Maggiore, Lorenzo Pranovi, Gianfranco Prete, Javier Praena, Roberto Capote-Noy, Fabiana Gramegna, Augusto Lombardi, Luca Maran, Carlo Scian, and Enrico Munaron
Phys. Rev. C 94, 034620 – Published 30 September 2016

Abstract

The 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)] and the one obtained using the Evaluated Nuclear Data File version B-VII.1 are given.

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  • Received 10 March 2015
  • Revised 28 June 2016

DOI:https://doi.org/10.1103/PhysRevC.94.034620

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

Guido Martín-Hernández1, Pierfrancesco Mastinu2, Mario Maggiore2, Lorenzo Pranovi2, Gianfranco Prete2, Javier Praena3,4, Roberto Capote-Noy5, Fabiana Gramegna2, Augusto Lombardi2, Luca Maran2, Carlo Scian2, and Enrico Munaron2

  • 1Centro de Aplicaciones Tecnolgicas y Desarrollo Nuclear, 5ta y 30, Playa, La Habana, Cuba
  • 2INFN - Laboratori Nazionali di Legnaro, Viale dell'Universita 2, 35020 Legnaro, Italy
  • 3Universidad de Granada, Granada, Spain
  • 4Centro Nacional de Aceleradores (US-JA-CSIC), Sevilla, Spain
  • 5NAPC-Nuclear Data Section, International Atomic Energy Agency, A-1400 Vienna, Austria

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Issue

Vol. 94, Iss. 3 — September 2016

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