Test of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>Δ</mi></math>-Hole Model through the Energy Dependence of (<math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>π</mi><mo>,</mo><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow><mi>γ</mi></math>) Angular Correlations on <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">C</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>12</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>

R. Olszewski; R. Baran; A. Hofmann; S. Krell; H. W. Ortner; J. Orzechowski; G. Schmidtlein; F. Vogler; G. R. Smith; W. List; D. Dehnhard; M. Thies

doi:10.1103/PhysRevLett.57.2143

Test of the $Δ$ -Hole Model through the Energy Dependence of ( $π, π^{'} γ$ ) Angular Correlations on ${}^{12}C$

R. Olszewski, R. Baran, A. Hofmann, S. Krell, H. W. Ortner, J. Orzechowski, G. Schmidtlein, F. Vogler, G. R. Smith, W. List, D. Dehnhard, and M. Thies

Phys. Rev. Lett. 57, 2143 – Published 27 October 1986

Abstract

For the reaction ${}^{12}C (π, π^{'}) {}^{12}C^{*} (2^{+}, 4.44 MeV)$ , ${}^{12}C^{*} \to {}^{12}C (g . s .) + γ$ , pion- $γ$ angular correlations have been measured in and out of the reaction plane. The data taken at a pion momentum transfer of $q = 0.47$ ${fm}^{- 1}$ for incident kinetic energies of 116, 140, 162, 180, and 226 MeV confirm $Δ$ -hole model predictions, in which the $Δ$ propagation in the nucleus is explicitly taken into account.

Received 5 August 1986

DOI:https://doi.org/10.1103/PhysRevLett.57.2143

Authors & Affiliations

R. Olszewski^*, R. Baran, A. Hofmann, S. Krell^†, H. W. Ortner, J. Orzechowski, G. Schmidtlein, and F. Vogler

Physikalisches Institut der Universität Erlangen-Nürnberg, D-8520 Erlangen, West Germany

G. R. Smith^‡ and W. List

Kernforschungszentrum, Institut für Kernphysik und Institut für Experimentelle Kernphyisk der Universität Karlsruhe, D-7500 Karlsruhe, West Germany

D. Dehnhard

University of Minnesota, Minneapolis, Minnesota 55455

M. Thies

Natuurkundig Laboratorium der Vrije Universteit, 1007 MC Amsterdam, The Netherlands

^*Present address: Physics Department, University of British Columbia, Vancouver, B.C. V6T 2A6, Canada.
^†Present address: Physikalisches Institut der Universität Tübingen, D-7000 Tübingen, West Germany.
^‡Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, B.C. V6T 2A6, Canada.