Gamma-ray study of pion-induced reactions on the nickel isotopes

H. E. Jackson, S. B. Kaufman, D. G. Kovar, L. Meyer-Schützmeister, K. E. Rehm, J. P. Schiffer, S. L. Tabor, S. E. Vigdor, T. P. Wangler, L. L. Rutledge, Jr., R. E. Segel, R. L. Burman, P. A. M. Gram, R. P. Redwine, and M. A. Yates-Williams
Phys. Rev. C 18, 2656 – Published 1 December 1978
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Abstract

The spectra of residual nuclides following 100-, 160-, and 220-MeV π+ and π bombardment of Ni58,60,62,64 have been measured by detecting prompt and, at 220 MeV, β-delayed gamma rays. A wide spectrum of residual nuclides extending along the valley of stability down to Ca, is seen. Where radioactivities were measured, the total (prompt + delayed) observed cross section amounted to ≈ 900 mb. The mean number of nucleons removed increased from about 5 for the Ni58 target to about 8 for Ni64. The residual nuclide spectrum depends sensitively on the target neutron excess, but is essentially independent of pion charge or pion energy in the range observed. A Monte-Carlo cascade-evaporation calculation involving an intermediate Δ resonance reproduces the yield of residual nuclides far (more than about eight nucleons) removed from the target, but it fails to reproduce the yield of nearer nuclides which is a more sensitive measure of the early stages of the reaction.

NUCLEAR REACTION Ni58,60,62,64,(π±, xγ), Eπ=100, 160, 220 MeV; measured prompt and β-delayed γ spectra; determined yields of residual nuclides and their distribution; established systematics. Enriched targets.

  • Received 13 July 1978

DOI:https://doi.org/10.1103/PhysRevC.18.2656

©1978 American Physical Society

Authors & Affiliations

H. E. Jackson, S. B. Kaufman, D. G. Kovar, L. Meyer-Schützmeister, K. E. Rehm*, J. P. Schiffer, S. L. Tabor, S. E. Vigdor§, and T. P. Wangler

  • Argonne National Laboratory, Argonne, Illinois 60439

L. L. Rutledge, Jr. and R. E. Segel

  • Northwestern University, Evanston, Illinois 60201

R. L. Burman, P. A. M. Gram, R. P. Redwine, and M. A. Yates-Williams

  • Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545

  • *Present address: Technical University of Munich, West Germany.
  • Also at the University of Chicago, Chicago, Illinois 60637.
  • Present address: University of Maryland, College Park, Maryland 20742.
  • §Present address: Indiana University, Bloomington, Indiana 47401.
  • Now at Argonne National Laboratory, Argonne, Illinois 60439.
  • Also at Argonne National Laboratory.

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Issue

Vol. 18, Iss. 6 — December 1978

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