High resolution He 3 t experiment on the double beta decaying nuclei Te 128 and Te 130

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Gamow-Teller (GT) strength distributions have been investigated in a high-resolution (${}^{3}$He,$t$) charge-exchange experiment on the double-$\ensuremath{\beta}$ ($\ensuremath{\beta}\ensuremath{\beta}$ ) decaying nuclei ${}^{128}$Te and ${}^{130}$Te. The experiment was carried out at the Research Center for Nuclear Physics, Osaka, with a 420-MeV incident ${}^{3}$He beam and the Grand Raiden magnetic spectrometer. A final-state energy resolution of 35 keV was achieved. The extracted GT strength distributions at low excitation energies in the final nuclei ${}^{128}$I and ${}^{130}$I are presented and discussed in the context of the $\ensuremath{\beta}\ensuremath{\beta}$ decay matrix elements for the two tellurium nuclei. The additional neutron pair in ${}^{130}$Te seems to produce a moderate increase in the fragmentation of the low-energy GT distribution.