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

Research output: Contribution to journalArticle

Abstract

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.

Original languageEnglish
Number of pages1
JournalPhysical Review C - Nuclear Physics
Volume62
Issue number2
DOIs
Publication statusPublished - 2000 Jan 1
Externally publishedYes

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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    Itahashi, K., Oyama, K., Hayano, R. S., Gilg, H., Gillitzer, A., Knülle, M., Münch, M., Schott, W., Kienle, P., Geissel, H., Iwasa, N., Münzenberg, G., Hirenzaki, S., Toki, H., & Yamazaki, T. (2000). 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. Physical Review C - Nuclear Physics, 62(2). https://doi.org/10.1103/PhysRevC.62.025202