Particle-Particle Coincidence Measurements for 1,2,3H and 4He in the Reaction 480 MeV 56Fe + natAg

Authors

Graham F. Peaslee, Department of Chemistry, State University of New York at Stony BrookFollow
N. N. Ajitanand, Department of Chemistry, State University of New York at Stony Brook
John M. Alexander, Department of Chemistry, State University of New York at Stony Brook
Roy Lacey, Department of Chemistry, State University of New York at Stony Brook
L. C. Vaz, Department of Chemistry, State University of New York at Stony Brook
Morton Kaplan, Department of Chemistry, Carnegie-Mellon University
M. Kildir, Department of Chemistry, Carnegie-Mellon University
D. J. Moses, Department of Chemistry, Carnegie-Mellon University
D. Logan, Lawrence Berkeley Laboratory
M. S. Zisman, Lawrence Berkeley Laboratory

Document Type

Article

Publication Date

2-1-1989

Publication Source

Physical Review C

Volume Number

39

Issue Number

2

First Page

488

Last Page

496

Publisher

American Physical Society

Abstract

Particle-particle coincidence measurements have been made between light charged particles (1,2,3H and He4) produced in the reaction (8.5 MeV/nucleon) 56Fe+natAg. This coincidence requirement emphasizes central collisions leading to evaporation residues. Average multiplicities are found to be approximately three alphas and approximately four protons per evaporation residue; these values imply that approximately (1/2 the initial excitation energy of about 211 MeV is evacuated from the evaporation residues by these particles. This fractional energy evacuation by charged particles is considerably larger than that found for the similar reaction (8.5 MeV/nucleon) Ag40. In both reactions the effective emission barriers for H1 and He4 (as deduced from the energy spectra) are found to be significantly lower than corresponding empirical fusion barriers between cold nuclei. This is particularly surprising for emitter nuclei that survive fission.

Recommended Citation

Repository citation: Peaslee, Graham F.; Ajitanand, N. N.; Alexander, John M.; Lacey, Roy; Vaz, L. C.; Kaplan, Morton; Kildir, M.; Moses, D. J.; Logan, D.; and Zisman, M. S., "Particle-Particle Coincidence Measurements for 1,2,3H and 4He in the Reaction 480 MeV 56Fe + natAg" (1989). Faculty Publications. Paper 1130.
https://digitalcommons.hope.edu/faculty_publications/1130

Published in: Physical Review C, Volume 39, Issue 2, February 1, 1989, pages 488-496. Copyright © 1989 American Physical Society.