E-resources
Peer reviewed
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Suzuki, K.; Fujita, M.; Geissel, H.; Gilg, H.; Gillitzer, A.; Hayano, R.S.; Hirenzaki, S.; Itahashi, K.; Iwasaki, M.; Kienle, P.; Matos, M.; Münzenberg, G.; Ohtsubo, T.; Sato, M.; Shindo, M.; Suzuki, T.; Weick, H.; Winkler, M.; Yamazaki, T.; Yoneyama, T.
Nuclear physics. A, 06/2003, Volume: 721Journal Article
We successfully observed deeply bound pionic 1s states in Sn isotopes ( 115Sn, 119Sn, 123Sn) using the Sn( d, 3He) 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.
