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Deeply bound 1s and 2p pionic states in 205Pb and determination of the s-wave part of the pion-nucleus interaction |
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| Authors: | Geissel H Gilg H Gillitzer A Hayano R S Hirenzaki S Itahashi K Iwasaki M Kienle P Münch M Münzenberg G Schott W Suzuki K Tomono D Weick H Yamazaki T Yoneyama T |
| Affiliation: | Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany. |
| Abstract: | We observed well-separated 1s and 2p pi(-) states in 205Pb in the 206Pb(d,3He) reaction at T(d) = 604.3 MeV. The binding energies and the widths determined are B(1s) = 6.762+/-0.061 MeV, Gamma(1s) = 0.764(+0.154)(-0.171) MeV, B(2p) = 5.110+/-0.045 MeV, and Gamma(2p) = 0.321(-0.062)(+0.060) MeV. They are used to deduce the real and imaginary strengths of the s-wave part of the pion-nucleus interaction, which translates into a positive mass shift of pi(-) in 205Pb. |
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