Table 1.

Signatures of the ${}^{82}\mathrm{Se}$ decays to the excited states of ${}^{82}$Kr, grouped according to the decay level: $\beta \beta$ is the energy carried away by electrons in the decay to the 2${}_1^{+}$ state ($\beta {\beta }_1$), to the 2${}_2^{+}$ state ($\beta {\beta }_2$), or to the 0${}_1^{+}$ state ($\beta {\beta }_3$); ${\gamma }_i$ are the $\gamma$ rays emitted in the de-excitation to the ground state (Fig. 1); the vertical bar separates the particles releasing their full energy (E${}_{\mathit{main}}$) in the 1${}^{\mathit{st}}$ crystal, and the particles releasing their full energy (E${}_{\mathit{coinc}}$) in the second crystal.The detection efficiency $ϵ$ is determined by a Monte Carlo simulation. Different decay schemes resulting in the same signature (for example, 1, 7, 11) are labelled with the same letter in the last column; the letter B indicates two states with a slightly different energy $\beta \beta$, that were grouped given the resolution of the detector

	Signature	E${}_{\mathit{main}}$	E${}_{\mathit{coinc}}$	$ϵ$
		[keV]	[keV]	[$\%$]
1	$\beta {\beta }_1$ $\mid$ ${\gamma }_1$	2220.5	776.5	1.817±0.009	A
2	$\beta {\beta }_2$ $\mid$ ${\gamma }_1$	1522.1	776.5	0.604±0.004	B
3	$\beta {\beta }_2$ $\mid$ ${\gamma }_2$	1522.1	698.4	0.664±0.004	C
4	$\beta {\beta }_2$ $\mid$ ${\gamma }_3$	1522.1	1474.9	0.919±0.007	D
5	$\beta {\beta }_2$ $\mid$ ${\gamma }_1$ + ${\gamma }_2$	1522.1	1474.9	0.0141±0.0004	D
6	$\beta {\beta }_2$ + ${\gamma }_1$ $\mid$ ${\gamma }_2$	2298.6	698.4	0.201±0.002	E
7	$\beta {\beta }_2$ + ${\gamma }_2$ $\mid$ ${\gamma }_1$	2220.5	776.5	0.211±0.002	A
8	$\beta {\beta }_3$ $\mid$ ${\gamma }_2$	1509.4	776.5	0.606±0.006	B
9	$\beta {\beta }_3$ $\mid$ ${\gamma }_4$	1509.4	711.1	0.660±0.006	F
10	$\beta {\beta }_3$ + ${\gamma }_1$ $\mid$ ${\gamma }_4$	2285.9	711.1	0.196±0.003	G
11	$\beta {\beta }_3$ + ${\gamma }_4$ $\mid$ ${\gamma }_1$	2220.5	776.5	0.200±0.003	A