Deeply bound 1s and 2p pionic states in 205Pb and determination of the s-wave part of the pion-nucleus interaction.
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.
Geissel
H
H
Gesellschaft für Schwerionenforschung, D-64291 Darmstadt, Germany.
Gilg
H
H
Gillitzer
A
A
Hayano
R S
RS
Hirenzaki
S
S
Itahashi
K
K
Iwasaki
M
M
Kienle
P
P
Münch
M
M
Münzenberg
G
G
Schott
W
W
Suzuki
K
K
Tomono
D
D
Weick
H
H
Yamazaki
T
T
Yoneyama
T
T