Isospin Dependence of Pion Absorption on Nucleon Pairs at <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>T</mi></mrow><mrow><mi>π</mi></mrow></msub></mrow><mo>=</mo><mn>65</mn><mn></mn></math></span> MeV

M. A. Moinester; D. R. Gill; J. Vincent; D. Ashery; S. Levenson; J. Alster; A. Altman; J. Lichtenstadt; E. Piasetzky; K. A. Aniol; R. R. Johnson; H. W. Roser; R. Tacik; W. Gyles; B. Barnett; R. J. Sobie; H. P. Gubler

doi:10.1103/PhysRevLett.52.1203

Isospin Dependence of Pion Absorption on Nucleon Pairs at $T_{π} = 65$ MeV

M. A. Moinester, D. R. Gill, J. Vincent, D. Ashery, S. Levenson, J. Alster, A. Altman, J. Lichtenstadt, E. Piasetzky, K. A. Aniol, R. R. Johnson, H. W. Roser, R. Tacik, W. Gyles, B. Barnett, R. J. Sobie, and H. P. Gubler

Phys. Rev. Lett. 52, 1203 – Published 2 April 1984

Abstract

Angular distributions of differential cross sections were measured for the first time for pion absorption on a $T = 1$ , $S = 0$ nucleon pair and for absorption on a $T = 0$ , $S = 1$ pair in the ${}^{3}{He}$ nucleus. A large isospin dependence is observed in the differential cross sections. The ratio of cross sections $\frac{σ ({}^{3}{He} (π^{+}, 2 p))}{σ ({}^{3}{He} (π^{-}, p n))}$ is 15.2±1.2. The results show evidence of an isoscalar component of the final state in the reaction ${}^{3}{He} (π^{-}, p n) n$ , which cannot be mediated by $Δ$ resonance formation.

Received 23 January 1984

DOI:https://doi.org/10.1103/PhysRevLett.52.1203

Authors & Affiliations

M. A. Moinester^*, D. R. Gill, and J. Vincent

TRIUMF, Vancouver, British Columbia V6T 2A3, Canada

D. Ashery^* and S. Levenson^†

Argonne National Laboratory, Argonne, Illinois 60439

J. Alster, A. Altman^‡, J. Lichtenstadt, and E. Piasetzky^§

Department of Physics, Tel-Aviv University, Ramat Aviv, Israel 69978

K. A. Aniol, R. R. Johnson, H. W. Roser, R. Tacik, W. Gyles, and B. Barnett

Department of Physics, University of British Columbia, Vancouver, British Columbia V6T 2A6, Canada

R. J. Sobie

Physics Department, University of Toronto, Toronto, Ontario M5S 1A7, Canada

H. P. Gubler

Physics Department, University of Manitoba, Winnipeg, Manitoba R3T 2N2, Canada

^*Permanent address: Department of Physics, Tel Aviv University, Ramat Aviv, Israel 69978.
^†Present address: Department of Physics, Northwestern University, Evanston, Ill. 60201.
^‡Present address: Department of Physics, University of British Columbia, Vancouver, British Columbia V6T 2A6, Canada.
^§Present address: Los Alamos Scientific Laboratory, Los Alamos, N. Mex. 87545.