Total reaction and 2n-removal cross sections of 20–60A MeV He4,6,8, Li69,11, and Be10 on Si

Phys. Rev. C 54, 1700 – Published 1 October 1996
R. E. Warner, R. A. Patty, P. M. Voyles, A. Nadasen, F. D. Becchetti, J. A. Brown, H. Esbensen, A. Galonsky, J. J. Kolata, J. Kruse, M. Y. Lee, R. M. Ronningen, P. Schwandt, J. von Schwarzenberg, B. M. Sherrill, K. Subotic, J. Wang, and P. Zecher

Abstract

Total reaction cross sections, σR, of 20–60A MeV He4,6,8, Li69,11, and Be10 were measured by injecting magnetically separated, focused, monoenergetic, identified secondary beams of those projectiles into a Si detector telescope and measuring their energy-deposition spectra. These σR’s, accurate to about 3%, were compared with predictions of optical, strong absorption, and microscopic models. The latter gave the best overall fit to the data, providing long-tailed matter densities were assumed. The best available optical potentials generally overpredicted the data by about 10%. Strong absorption calculations, in which the isospin-dependent term is quite important, were often unsuccessful, especially for projectiles with large neutron excess. Two-neutron removal cross sections were measured for He6 and Li11; the Li11 data were slightly overpredicted by a microscopic model which includes correlation effects for the Li11 valence neutrons. Both 2n and 4n removal from He8 were observed, in about a 2:1 ratio. Subtraction analysis of the data indicates that He4 is a good core within He6 and He8, as is Li9 within Li11. © 1996 The American Physical Society.

DOI: http://dx.doi.org/10.1103/PhysRevC.54.1700

  • Received 1 March 1996
  • Published in the issue dated October 1996

© 1996 The American Physical Society

Authors & Affiliations

R. E. Warner, R. A. Patty, P. M. Voyles, A. Nadasen, F. D. Becchetti, J. A. Brown, H. Esbensen, A. Galonsky, J. J. Kolata, J. Kruse, M. Y. Lee, R. M. Ronningen, P. Schwandt, J. von Schwarzenberg, B. M. Sherrill, K. Subotic, J. Wang, and P. Zecher

  • National Superconducting Cyclotron Laboratory, East Lansing, Michigan 48824
  • Oberlin College, Oberlin, Ohio 44074
  • University of Michigan, Dearborn, Michigan 48128
  • University of Michigan, Ann Arbor, Michigan 48109
  • Argonne National Laboratory, Argonne, Illinois 60439
  • University of Notre Dame, Notre Dame, Indiana 46556
  • Indiana University Cyclotron Facility, Bloomington, Indiana 47405
  • Institute of Nuclear Sciences, VINCA, Belgrade 11001, Yugoslavia

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