Probability distribution of excitations to the electronic continuum ofHeT+following the β decay of theT2molecule

We present a calculation of the probability density for the excitation to the molecular continuum of ${\mathrm{HeT}}^{+}$ following the β decay of ${\mathit{T}}_2$, pertinent to the investigation of chemical effects in the neutrino mass experiments. The relevant transition amplitude has been obtained by means of a novel technique that avoids the explicit calculation of the continuum states of ${\mathrm{HeT}}^{+}$, and delivers the properly normalized probability density which includes both the background and resonant scattering contributions. We found two distinct sharp resonances at 75 eV below the end point of β spectrum where excess count rate has been observed in the recent neutrino mass experiment.