Study of the pionic enhancement in 16O(p, p′) 16O(0-, T = 1) at 295 MeV

T. Wakasa, G. P.A. Berg, H. Fujimura, K. Fujita, K. Hatanaka, M. Ichimura, M. Itoh, J. Kamiya, T. Kawabata, Y. Kitamura, E. Obayashi, H. Sakaguchi, N. Sakamoto, Y. Sakemi, Y. Shimizu, H. Takeda, M. Uchida, Y. Yasuda, H. P. Yoshida, M. Yosoi

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Abstract

The cross section of the O16(p,p′)O16(0-,T=1) scattering was measured at a bombarding energy of 295 MeV in the momentum transfer range of 1.0fm-1≤qc.m.≤2.1fm-1. The isovector 0- state at Ex=12.8MeV is clearly separated from its neighboring states owing to the high energy resolution of about 30 keV. The cross section data were compared with distorted wave impulse approximation (DWIA) calculations employing shell-model wave functions. The observed cross sections around qc.m.≃1.7fm-1 are significantly larger than obtained by these calculations, suggesting pionic enhancement as a precursor of pion condensation in nuclei. The data are well reproduced by DWIA calculations using random phase approximation response functions including the Δ isobar that predict pionic enhancement.

Original languageEnglish
Pages (from-to)485-489
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume632
Issue number4
DOIs
Publication statusPublished - 2006 Jan 19

Keywords

  • High resolution measurement
  • Isovector 0 state
  • Landau-Migdal parameters
  • Pionic enhancement
  • Spin-longitudinal response

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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