TY - JOUR

T1 - 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

AU - Itahashi, K.

AU - Oyama, K.

AU - Hayano, R. S.

AU - Gilg, H.

AU - Gillitzer, A.

AU - Knülle, M.

AU - Münch, M.

AU - Schott, W.

AU - Kienle, P.

AU - Geissel, H.

AU - Iwasa, N.

AU - Münzenberg, G.

AU - Hirenzaki, S.

AU - Toki, H.

AU - Yamazaki, T.

N1 - Copyright:
Copyright 2017 Elsevier B.V., All rights reserved.

PY - 2000

Y1 - 2000

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevC.62.025202

DO - 10.1103/PhysRevC.62.025202

M3 - Article

AN - SCOPUS:85035294942

VL - 62

SP - 12

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

SN - 0556-2813

IS - 2

ER -