calculated by the shell model KB3G, as compared to pn-QRPA and experimental results, tends to shift to higher excitation energies in daughter $^{57}$Cu. The pn-QRPA integrated GT strength over the $Q$ window is shown in Fig. \[fig2\]. For comparison, the overall shift in B(GT) strength of the shell model prediction along with the experimentally extracted integrated GT strength is shown in Fig. \[fig3\]. In the present work we obtained a summed B(GT) of 1.86 as compared to 1.25 in Ref. [@Jokinen02] within the excitation energy interval between 0 and 7 MeV in daughter $^{57}$Cu. The authors in Ref. [@Jokinen02] increased the strength by the upper B(GT) limit for the 1.028 MeV state and the theoretical B(GT) value for the IAS to yield $1.44^{+0.25}_{-0.17}$ and they estimated that less than 2% of the total GT strength could be missed due to the unobserved gamma-transitions. The shell model predicted strength for the same excitation of energies amounts to 1.68.

In beta decay experiments the sensitivity of the experiment strongly decreases as one moves to higher excitation energies in daughter. This puts a limit for such experiments and thus one can only probe the low-energy tails of the GT strength distribution. Consequently one 