Deeply Bound Pionic 1s States in Sn Isotopes
- Suzuki, K.
- Fujita, M.
- Matos, M.
- Münzenberg, G.
- Ohtsubo, T.
- Sato, M.
- Shindo, M.
- Suzuki, T.
- Weick, H.
- Winkler, M.
- Yamazaki, T.
- Yoneyama, T.
- Geissel, H.
- Gilg, H.
- Gillitzer, C. G.
- Hayano, R. S.
- Hirenzaki, S.
- Itahashi, K.
- Iwasaki, M.
- Kienle, P.
DOIAbstract
We successfully observed deeply bound picnic 1s states in Sn isotopes (Sn-115, Sn-119, Sn-123) using the Sn(d,He-3) pion-transfer reaction under the recoil-free condition. The 1s binding energies and widths were determined to high precision. The present results indicate that the isovector part of the s-wave pion-nucleus interaction is significantly enhanced, giving a clear evidence for partial restoration of chiral symmetry in the nuclear medium
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