Fragmentation of Single-Particle Strength around the Doubly Magic Nucleus Sn132 and the Position of the 0f5/2 Proton-Hole State in In131
2020
Spectroscopic factors of neutron-hole and proton-hole states in 131Sn and 131In, respectively, were
measured using one-nucleon removal reactions from doubly magic 132Sn at relativistic energies. For 131In, a
2910(50)-keV γ ray was observed for the first time and tentatively assigned to a decay from a 5=2− state
at 3275(50) keV to the known 1=2− level at 365 keV. The spectroscopic factors determined for this new
excited state and three other single-hole states provide first evidence for a strong fragmentation of singlehole strength in 131Sn and 131In. The experimental results are compared to theoretical calculations based on
the relativistic particle-vibration coupling
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