Deeply bound 1s and 2p pionic states in 205Pb and effective pion mass in nuclear matter

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作者
Geissel, H [1 ]
Gilg, H [1 ]
Gillitzer, A [1 ]
Hayano, RS [1 ]
Hirenzaki, S [1 ]
Itahashi, K [1 ]
Iwasaki, M [1 ]
Kienle, P [1 ]
Münch, M [1 ]
Münzenberg, G [1 ]
Schott, W [1 ]
Suzuki, K [1 ]
Tomono, D [1 ]
Weick, H [1 ]
Yamazaki, T [1 ]
Yoneyama, T [1 ]
机构
[1] Gesell Schwerionenforsch mbH, D-64291 Darmstadt, Germany
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O57 [原子核物理学、高能物理学];
学科分类号
070202 ;
摘要
Recently we have succeeded in observing the 1s and 2p bound pionic states in Pb-205 nucleus as well separated peaks in the excitation spectrum of the Pb-206(d,He-3) reaction. The observed spectrum agreed quite well with the theoretical prediction where the formation cross section was calculated for the deeply bound pionic states [1]. These states are accommodated in proximity to the nuclear surface as halo states in a potential provided by the attractive Coulomb and the repulsive core. The binding energies and the widths were precisely determined, and the values were used to deduce the unknown s-wave part of the pi-nucleus interaction and to translate it to the effective pion mass in nuclear matter.
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页码:1019 / 1023
页数:5
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