Deeply bound 1s and 2p states in pionic atoms

Nuclear Physics A(1990)

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摘要
New results were obtained on pionic 1s levels in 24Mg, 27Al and 28Si, on 2p states in 93Nb and natRu, as well as on 3d states in 93Nb, natRu, natAg and natCd. For the first time the predicted repulsive shifts for the pionic 2p level have been observed. The following values were obtained for the strong-interaction shifts and widths (all values in keV); 24Mg: ε1s0 = −80.5 ± 0.6 and Γ1s0 = 24.3 ± 1.6; 27Al: ε1s0 = −115.5 ± 1.4 and Γ1s0 = 28.8 ± 1.2, 28Si: ε1s0 = −131.6 ± 2.0 and Γ1s0 = 41 ± 4;93Nb: ε2p0 = −11 ± 3, Γ2p0 = 64 ± 8, ε3d0 = 0.74 ± 0.02 and Γ3d0 = 0.402 ± 0.016; natRu: ε2p0 = −48 ± 7, Γ2p0 = 77 ± 24, ε3d0 = 1.39 ± 0.08 and Γ3d0 = 0.75 ± 0.08; natAg: ε3d0 = 1.94 ± 0.07 and Γ3d0 = 1.44 ± 0.05 and natCd: ε3d0 = 2.14 ± 0.09 and Γ3d0 = 1.65 ± 0.07. The results are in reasonable agreement with the predictions of the standard optical potentials.
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关键词
NUCLEAR REACTIONS 24Mg, 27Al, 28Si (π−, xnypγ), E at rest,measured prompt, delayed neutron, X-ray, γ-spectra,93Nb, Ru, Ag, Cd (π−, X), E at rest,measured X-ray spectra,deduced strong interaction shifts, widths
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