Production of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>A</mi><mo>=</mo><mn>6</mn><mo>,</mo><mn>7</mn><mn></mn></math></span> nuclides in the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>α</mi><mo>+</mo><mi>α</mi></math></span> reaction and cosmic ray nucleosynthesis

David J. Mercer; Sam M. Austin; J. A. Brown; S. A. Danczyk; S. E. Hirzebruch; J. H. Kelley; T. Suomijärvi; D. A. Roberts; T. P. Walker

doi:10.1103/PhysRevC.63.065805

Production of $A = 6, 7$ nuclides in the $α + α$ reaction and cosmic ray nucleosynthesis

David J. Mercer, Sam M. Austin, J. A. Brown, S. A. Danczyk, S. E. Hirzebruch, J. H. Kelley, T. Suomijärvi, D. A. Roberts, and T. P. Walker

Phys. Rev. C 63, 065805 – Published 15 May 2001

Abstract

Cross sections for production of $^{6} He,$ $^{6} Li,$ $^{7} Li,$ and $^{7} Be$ in the $α + α$ reaction were measured at bombarding energies of 159.3, 279.6, and 619.8 MeV and are found to decrease rapidly with increasing energy. These cross sections are essential for the calculation of the rate of nucleosynthesis of the lithium isotopes in the cosmic rays and thereby play a key role in our understanding of the synthesis of Li, Be, and B. The results for $^{6} Li$ differ significantly from the tabulated values commonly used in cosmic ray production calculations and lead to lower production of $^{6} Li .$

Received 1 October 2000

DOI:https://doi.org/10.1103/PhysRevC.63.065805

Authors & Affiliations

David J. Mercer^1,2,*, Sam M. Austin^2,3,†, J. A. Brown^2,‡, S. A. Danczyk^2,3, S. E. Hirzebruch², J. H. Kelley^2,3,§, T. Suomijärvi^2,4, D. A. Roberts⁵, and T. P. Walker⁶

¹Nuclear Physics Laboratory, University of Colorado, Boulder, Colorado 80309-0446
²National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824
³Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
⁴Institute de Physique Nucléaire, IN2P3-CNRS, F-91406 Orsay, France
⁵Department of Physics, University of Michigan, Ann Arbor, Michigan, 48109
⁶Department of Physics, The Ohio State University, Columbus, Ohio 43210

^*Present address: NIS-5 Group, LANL, Los Alamos, NM 87545; electronic address: mercer@lanl.gov
^†Electronic address: austin@nscl.msu.edu
^‡Present address: Physics Department, Millikin University, Decatur, IL 62522.
^§Present address: Department of Physics, North Carolina State University, Raleigh, NC 27695.

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Vol. 63, Iss. 6 — June 2001

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