Exclusive Measurement of Proton Quasifree Scattering and Density Dependence of the Nucleon-Nucleon Interaction

K. Hatanaka, M. Kawabata, N. Matsuoka, Y. Mizuno, S. Morinobu, M. Nakamura, T. Noro, A. Okihana, K. Sagara, K. Takahisa, H. Takeda, K. Tamura, M. Tanaka, S. Toyama, H. Yamazaki, and Y. Yuasa
Phys. Rev. Lett. 78, 1014 – Published 10 February 1997
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Abstract

Differential cross sections and analyzing powers ( Ay) have been measured for the proton knockout reaction from s1/2 orbits of three kinds of target nuclei at Ep=392MeV. The Ay values are reduced from those of free proton-proton scattering and the reduction rate is found to depend on target. For the present setting, where the recoil momentum is almost zero, an averaged density seen through this reaction can be estimated and it reaches almost half of the saturation density in some cases. The reduction of Ay shows a monotonically decreasing function of the averaged density, which strongly suggests the existence of a nuclear medium effect on the nucleon-nucleon interaction.

  • Received 8 August 1996

DOI:https://doi.org/10.1103/PhysRevLett.78.1014

©1997 American Physical Society

Authors & Affiliations

K. Hatanaka1, M. Kawabata1, N. Matsuoka1, Y. Mizuno1, S. Morinobu2, M. Nakamura3, T. Noro1, A. Okihana4, K. Sagara2, K. Takahisa1, H. Takeda3, K. Tamura1, M. Tanaka1, S. Toyama3, H. Yamazaki5, and Y. Yuasa1

  • 1Research Center for Nuclear Physics, Osaka University, Osaka 567, Japan
  • 2Department of Physics, Kyushu University, Fukuoka 812, Japan
  • 3Department of Physics, Kyoto University, Kyoto 606, Japan
  • 4Kyoto University of Education, Kyoto 600, Japan
  • 5Laboratory of Nuclear Science, Tohoku University, Sendai 982, Japan

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Vol. 78, Iss. 6 — 10 February 1997

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