Abstract
The hole-vibration coupling in the Z = 50 region is investigated by calculating the level structure of 115In. Four proton-hole states are coupled with quadrupole and octupole core vibrations. The phonon energies and the amplitudes of the vibrational motions are taken from experiment, while the single-hole energies are treated as free parameters. Most of the observed features of a quintet of states with I π = 5 2 +, 7 2 +, 9 2 +, 11 2 +, 13 2 + , which have enhanced E2 transition strengths to the ground state, are well reproduced by the theory. The hole-vibration coupling produces a strong fragmentation of the single-hole strengths. This is quite in agreement with the results of (d, 3He) experiments on 116Sn.
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