New determination of proton spectroscopic factors and reduced widths for Be8 states in the 16.5–18.0 MeV excitation energy region via the study of the Li7(He3,d)Be8 transfer reaction at Elab=20 MeV: Implication for the Li7(p,α)He4 hydrogen burning reaction

A. Belhout, S. Ouichaoui, H. Beaumevieille, A. Bouchemha, G. Bogaert, S. Fortier, J. Kiener, A. Lefebvre-Schuhl, J. M. Maison, L. Rosier, J. Rotbard, V. Tatischeff, J. P. Thibaud, and J. Vernotte
Phys. Rev. C 96, 054601 – Published 3 November 2017

Abstract

The angular distributions of Be8 states in the excitation energy region Ex(16.518.2) MeV produced in the Li7(He3,d)Be8 proton transfer reaction have been measured at the Orsay 14.8MV tandem accelerator for He2+3 ion bombarding energy, Elab=20 MeV, and forward angular range, θlab=550. A high energy resolution detection system composed of a split-pole magnetic spectrometer and a ΔEE, position-sensitive drift chamber was used to record the energy spectra of outgoing deuterons. The measured cross section data for the direct reaction component have been separated from the compound nucleus one, then analyzed in the framework of the nonlocal, finite-range (FR)–distorted-wave Born approximation (DWBA) theory. New values of the C2S and (Sp1/2,Sp3/2) proton absolute and partial spectroscopic factors and related γp2(a) proton reduced widths versus the p+Li7 channel radius have been extracted for the 2+(16.626) and 2+(16.922),T=0+1 isospin-mixed loosely bound states of astrophysical interest and the 1+(17.640), T=1 unbound state of Be8. They are compared to sparse earlier experimental values and to shell-model-predicted ones from the literature, and are discussed. In particular, the status of the spectroscopic information on the 2+ isospin-mixed doublet is reviewed and updated. The application in nuclear astrophysics of the DWBA derived results is emphasized.

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  • Received 22 July 2017

DOI:https://doi.org/10.1103/PhysRevC.96.054601

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

A. Belhout1, S. Ouichaoui1,*, H. Beaumevieille1, A. Bouchemha1, G. Bogaert2,†, S. Fortier3, J. Kiener2, A. Lefebvre-Schuhl2, J. M. Maison3, L. Rosier3, J. Rotbard3, V. Tatischeff2, J. P. Thibaud2, and J. Vernotte3

  • 1Université des Sciences et de la Technologie Houari Boumediene (USTHB), Faculté de Physique, BP 32, El-Alia, 16111 Bab Ezzouar, Algiers, Algeria
  • 2Centre des Sciences Nucléaires et des Sciences de la Matière (CSNSM), IN2P3/CNRS-Université de Paris XI, 91405 Campus Orsay, France
  • 3Institut de Physique Nucléaire, IN2P3/CNRS-Université de Paris XI, 91406 Orsay Cedex, Orsay, France

  • *Corresponding author: souichaoui@gmail.com
  • Present address: Artemis, Université côte d'Azur, CNRS, Observatoire côte d'Azur, CS 34229, F-06304 Nice Cedex 4, France.

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Vol. 96, Iss. 5 — November 2017

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