Challenges in Double Beta Decay

Table 3

Phase-space factors 𝐺^0𝜈 in units of 10⁻¹⁵ yr⁻¹ [38] and specific phase space 𝐻^0𝜈 [63] in units of tonne⁻¹ y⁻¹ eV⁻² for 𝛽𝛽(0𝜈) candidate isotopes. 𝑄-values and natural isotopic abundances are reported in the second and third columns.

Isotope	𝑄𝛽𝛽 (keV)	I.A. (%)	𝐺^0𝜈	𝐻^0𝜈
48Ca	4272	0.187	24.81	826.2
76Ge	2039	7.8	2.36	49.6
82Se	2995	8.73	10.16	198.1
96Zr	3350	2.8	20.58	342.7
100Mo	3034	9.63	15.92	254.5
110Pd	2018	11.72	4.82	70.0
116Cd	2814	7.49	16.70	230.1
124Sn	2287	5.79	9.04	116.5
128Te	866	31.69	0.59	7.4
130Te	2527	33.8	14.22	174.8
136Xe	2458	8.9	14.58	171.4
148Nd	1929	5.76	10.10	109.1
150Nd	3371	5.64	63.03	671.7
154Sm	1215	22.7	3.02	31.3
160Gd	1730	21.86	9.56	95.5
198Pt	1047	7.2	7.56	61.0