https://doi.org/10.1140/epja/i2011-11022-7
Neutron particle-hole structure of states in 208Pb determined from the proton decay of the d5/2 isobaric analog resonance in 209Bi
1
Max-Planck-Institut für Kernphysik, D-69029, Heidelberg, Germany
2
Physik Department E12, Technische Universität München, D-85748, Garching, Germany
3
Fakultät für Physik, Ludwig-Maximilians-Universität München, D-85748, Garching, Germany
4
Institut für Kernphysik, Universität zu Köln, D-50937, Köln, Germany
5
Institut für Kernphysik, Technische Universität Darmstadt, D-64289, Darmstadt, Germany
6
WNSL, Yale University, 06520-8120, New Haven, CT, USA
Received:
14
December
2010
Accepted:
14
January
2011
Published online:
11
February
2011
Proton scattering on 208Pb via isobaric analog resonances (IARs) in 209Bi generates neutron particle-hole configurations in excited states of 208Pb . The spin and parity of the neutron particle correspond to the spin and parity of the resonance. We performed experiments on the 208Pb (p, p’) reaction via all known isobaric analog resonances in 209Bi with the Q3D magnetic spectrograph in München. We observed more than 130 levels in the range of excitation energies E
x
< 6.4 MeV. In the proton decay of the d
5/2 resonance, 29 levels have cross-sections larger than 5% of the maximum cross-section of any level. Six levels in the range 4.6 < E
x
< 5.2 MeV correspond to states with known spins and major strength. Six levels in the range 5.7 < E
x
< 6.4 MeV contain most of the
strength. At least one level originates from an unresolved doublet. Among the states with a major
component, only states with spins 1- and 3- are firmly identified. The comparison to previous data taken with semiconductor detectors reveals details of the structure of at least 18 states in the range 4.6 < E
x
< 6.4 MeV.
© SIF, Springer-Verlag Berlin Heidelberg, 2011