### 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 language | English |
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Number of pages | 1 |

Journal | Physical Review C - Nuclear Physics |

Volume | 62 |

Issue number | 2 |

DOIs | |

Publication status | Published - 2000 Jan 1 |

Externally published | Yes |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

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## Cite this

*Physical Review C - Nuclear Physics*,

*62*(2). https://doi.org/10.1103/PhysRevC.62.025202