Polarizations for proton knockout reactions from s1/2 orbits at 1 GeV

V. A. Andreev, M. N. Andronenko, G. M. Amalsky, S. L. Belostotski, O. A. Domchenkov, O. Ya Fedorov, K. Hatanaka, A. A. Izotov, A. A. Jgoun, J. Kamiya, A. Yu Kisselev, M. A. Kopytin, O. V. Miklukho, Yu G. Naryshkin, T. Noro, E. Obayashi, A. N. Prokofiev, D. A. Prokofiev, H. Sakaguchi, V. V. SulimovA. V. Shvedchikov, H. Takeda, S. I. Trush, V. V. Vikhrov, T. Wakasa, Y. Yasuda, H. P. Yoshida, A. Zhdanov

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Abstract

The polarization of protons emitted in (p,2p) reactions has been measured for three kinds of targets at 1 GeV. The values of the polarization that we obtain are significantly smaller than the values predicted using the nucleon-nucleon (NN) interaction in free space, and the discrepancy between the two is seen to increase monotonically as a function of the effective mean density, which is defined as a measure of the sensitivity of a reaction to density-dependent terms of the interaction. The experimental data are also compared with a model calculation that includes a relativistic effect, and it is found that inclusion of this effect is able to account for about half of the density-dependent discrepancy between the experimental results and the values predicted with the free space NN interaction. These results, in conjunction with the previous results at 392 MeV, indicate that this discrepancy is not caused by a contribution of multistep processes and provide further evidence that there exists a medium effect.

Original languageEnglish
Article number024604
Pages (from-to)246041-246047
Number of pages7
JournalPhysical Review C - Nuclear Physics
Volume69
Issue number2
Publication statusPublished - Feb 2004

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    Andreev, V. A., Andronenko, M. N., Amalsky, G. M., Belostotski, S. L., Domchenkov, O. A., Fedorov, O. Y., Hatanaka, K., Izotov, A. A., Jgoun, A. A., Kamiya, J., Kisselev, A. Y., Kopytin, M. A., Miklukho, O. V., Naryshkin, Y. G., Noro, T., Obayashi, E., Prokofiev, A. N., Prokofiev, D. A., Sakaguchi, H., ... Zhdanov, A. (2004). Polarizations for proton knockout reactions from s1/2 orbits at 1 GeV. Physical Review C - Nuclear Physics, 69(2), 246041-246047. [024604].