Neutron Deformation Parameter from Comparative Study of π+ and π Inelastic Scattering

S. Iversen, A. Obst, Kamal K. Seth, H. A. Thiessen, C. L. Morris, N. Tanaka, E. Smith, J. F. Amann, R. Boudrie, G. Burleson, M. Devereux, L. W. Swenson, P. Varghese, K. Boyer, W. J. Braithwaite, W. Cottingame, and C. Fred Moore
Phys. Rev. Lett. 40, 17 – Published 2 January 1978
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Abstract

Differential cross sections for the excitation of the 2+ state in O18 by 230-MeV pions are found to be about 70% larger for π than for π+. Since the π-nucleon interaction at this energy is dominated by the (3,3) resonance, it is concluded that the results imply that βRn1.3βRp, or alternatively, that (βR)n (valenceneutrons)3(βR)c(core), where β is the deformation parameter and R the equilibrium radius of the deformed potential. We believe that these results constitute the first example of measurement of the neutron deformation parameter.

  • Received 30 August 1977

DOI:https://doi.org/10.1103/PhysRevLett.40.17

©1978 American Physical Society

Authors & Affiliations

S. Iversen, A. Obst, and Kamal K. Seth

  • Northwestern University, Evanston, Illinois 60201

H. A. Thiessen, C. L. Morris, N. Tanaka, and E. Smith

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

J. F. Amann

  • Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213

R. Boudrie

  • University of Colorado, Boulder, Colorado 80302

G. Burleson and M. Devereux

  • New Mexico State University, Las Cruces, New Mexico 88001

L. W. Swenson and P. Varghese

  • Oregon State University, Corvallis, Oregon 97331

K. Boyer, W. J. Braithwaite, W. Cottingame, and C. Fred Moore

  • University of Texas, Austin, Texas 78712

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Vol. 40, Iss. 1 — 2 January 1978

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