Coulomb excitation of ${}^{107}$In

The radioactive isotope ${}^{107}$In was studied using sub-barrier Coulomb excitation at the REX-ISOLDE facility at CERN. Two $\gamma$ rays were observed during the experiment, corresponding to the low-lying $11/2^{+}$ and $3/2^{-}$ states. The reduced transition probability of the $11/2^{+}$ state was determined with the semiclassical Coulomb excitation code gosia2. The result is discussed in comparison to large-scale shell-model calculations, previous unified-model calculations, and earlier Coulomb excitation measurements in the odd-mass In isotopes.

Figure 1

The $\gamma$-ray spectra from the experiment, using either (a) Ni or (b) In particles for Doppler correction. The structure around 500 keV results from the 511 keV line, which collapses during the Doppler correction.

Figure 2

Partial level scheme of ${}^{107}$In, indicating the electron capture (EC) decay of ${}^{107}$Sn. The energies are given in keV. The two indicated $\gamma$-ray transitions were used to estimate the ${}^{107}$In${}^m$ contamination. The data were taken from Ref. [24].