Deeply bound [Formula Presented] states in [Formula Presented] formed in the [Formula Presented] reaction. II. Deduced binding energies and widths and the pion-nucleus interaction

K. Itahashi, K. Oyama, R. S. Hayano, H. Gilg, A. Gillitzer, M. Knülle, M. Münch, W. Schott, P. Kienle, H. Geissel, N. Iwasa, G. Münzenberg, S. Hirenzaki, H. Toki, T. Yamazaki

研究成果: Article査読

抄録

We find a remarkable agreement of the excitation energy spectrum of the [Formula Presented] reaction measured at [Formula Presented] near the [Formula Presented] production threshold with its theoretical prediction. Their comparison leads us to assign the distinct narrow peak observed at about 5 MeV below the threshold to the formation of bound pionic states [Formula Presented] of the quasisubstitutional configurations [Formula Presented] A small bump observed on the tail of the peak is assigned to the pionic [Formula Presented] state. The binding energies [Formula Presented] and the widths [Formula Presented] of the pionic orbitals are deduced to be [Formula Presented] and [Formula Presented] by decomposing the experimental spectrum into the pionic [Formula Presented] and [Formula Presented] components. While [Formula Presented] and [Formula Presented] are determined with small ambiguity, [Formula Presented] and [Formula Presented] are strongly correlated with each other, and are affected by the relative [Formula Presented] cross section ratio assumed, since the [Formula Presented] component is observed only as an unresolved bump. Thus, we have to allow large uncertainties [Formula Presented] and [Formula Presented] The experimental binding energies and widths are compared with theoretically calculated values based on various optical potential parameter sets, and are jointly used to deduce the effective [Formula Presented] mass in the nuclear medium.

本文言語English
ページ(範囲)12
ページ数1
ジャーナルPhysical Review C - Nuclear Physics
62
2
DOI
出版ステータスPublished - 2000
外部発表はい

ASJC Scopus subject areas

  • 核物理学および高エネルギー物理学

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