Neutrino Properties on the Basis of Neutrinoless

0νββLMN
0+g.s.→ 0+g.s
2νββ
0+g.s.→ 0+g.s
Feynman diagrams at the quark level for:
two-neutrino double beta decay
(allowed in SM)
neutrinoless double beta decay
LNM- light Majorana neutrino mechanism
(beyond SM)
(A,Z) -> (A,Z+2) + 2 e- + {2ν}

46Ca, 48Ca, 70Zn, 76Ge, 80Se, 82Se, 86Kr, 94Zr, 96Zr, 98Mo, 100Mo, 104Ru, 110Pd, 114Cd, 116Cd, 122Sn, 124Sn, 128Te, 130Te, 134Xe, 136Xe, 142Ce, 146Nd, 148Nd, 150Nd, 154Sm, 160Gd, 170Er, 176Yb, 186W, 192Os, 198Pt, 204Hg, 216Po, 220Rn, 222Rn, 226Ra, 232Th, 238U, 244Pu, 248Cm, 254Cf, 256Cf, 260Fm
The following known nuclides with A ≤ 260 are theoretically capable of double beta decay, where the red color is the isotopes in which the double beta rate has been measured experimentally, and the black color has yet to be measured experimentally:
The following known nuclides with A ≤ 260 are theoretically capable of double electron capture, where the red color is the isotopes for which the double electron capture rate has been measured, and the black color has not yet been measured experimentally:
36Ar, 40Ca, 50Cr, 54Fe, 58Ni, 64Zn, 74Se, 78Kr, 84Sr, 92Mo, 96Ru, 102Pd, 106Cd, 108Cd, 112Sn, 120Te, 124Xe, 126Xe, 130Ba, 132Ba, 136Ce, 138Ce, 144Sm, 148Gd, 150Gd, 152Gd, 154Dy, 156Dy, 158Dy, 162Er, 164Er, 168Yb, 174Hf, 180W, 184Os, 190Pt, 196Hg, 212Rn, 214Rn, 218Ra, 224Th, 230U, 236Pu, 242Cm, 252Fm, 258No
NDBDecayers
ECEC

Effects of a quenched gA on NMEs of 0 decays:

In order to exclude the inverted ordering allowed range for mββ (in case
there is no sterile neutrino), one would need to constrain mββ ~10 meV, which corresponds to T0ν 1/2 ≃ 1 × 1028 year, with some dependence on the material (phase space and NME). This means that none of the current generation experiments will be able to reach the required sensitivity, and we will have to wait for next generation upgrades and new projects.
Global fit: the Bayesian analysis to the 2018 publicly available oscillation and cosmological data sets
provides strong evidence for the normal neutrino mass ordering vs. the inverted scenario, with a significance of 3.5 standard deviations.
Neutrino Mass Ordering From Oscillations and Beyond:
2018 Status and Future Prospects
Pablo F. de Salas, Stefano Gariazzo, Olga Mena*, Christoph A. Ternes and Mariam Tórtola
Frontiers in Astronomy and Space Sciences | October 2018 | Volume 5 | Article 36 /
published: 09 October 2018 doi: 10.3389/fspas.2018.00036

11.5 kg of enriched in 76Ge detectors,
0.11 counts/(kg keV y) around 2040 keV
T1/2 (0νββ) > 1.9 x 1025 yr (90% C.L.) Eur.Phys. Jurn. A 12 (2001) 147
35.6 kg of enriched in 76Ge detectors
LAr scintillation Veto,
0.0005 counts/(kg keV y) near ROI
T1/2 (0νββ) > 1.8 x1026 yr (90% C.L.)
mββ < 0.08- 0.18 eV
exposure 1288 mole yr (Phases I+II)
Heidelberg-Moscow
1990- 2003
GERDA - II
2014- 2020
~ 20 yeas

GERDA Phase II

GERDA Phase II

GERDA-II at LNGS
Present & Future
LEGEND-200 at LNGS

моды ββ-распада и поиск других редких процессов в GERDA ( … и LEGEND)
0νββLMN - light Majorana neutrino mechanism

For more details see: А.А.Smolnikov, GERDA Searches for 0νββ and other ββ Decay Modes of 76Ge,
AIP Conference Proceedings, 2165, 020024, 1-4, 2019

Phase I and Phase II data together give a total exposure of 127.2 kg yr, which corresponds to 1288 mol yr of 76Ge. The combined analysis has a best fit for null signal strength, and provides a half-life limit of
Final Results of GERDA on the Search for 0νββ decay of 76Ge
arXiv:2009.06079v1 [nucl-ex] 13 Sep 2020
submitted to PRL

Phase II
(2.03 ± 0.02) ⋅1021 yr
After LAr Veto performance
Survival fraction between 0.6 and 1.3 MeV:
(68.6 ± 0.3)%
T1/2(2ν2β) fixed as 2.03 1021 yr
40K and 42K continua
strongly suppressed
40K
42K
Only 2νββ left
Half-life of 2νββ decay of 76Ge
(1.926 ± 0.094) ⋅1021 yr
From Phase I

0νββ with liquid scintillators KamLAND-Zen
К. Гусев | РХЛ | 06.07.2020

SNO+ D=12 m Te-130 = 0.5% in LSTe

0νββ with bolometers CUORE
К. Гусев | РХЛ | 06.07.2020

0νββ with bolometers CUORE
К. Гусев | РХЛ | 06.07.2020

0νββ with bolometers CUORE
К. Гусев | РХЛ | 06.07.2020

AgAgostini et al., Science 365 , 1445-1448 (2019) 27 Septembre 2019

GERDA SENSITIVITY CALCULATIONS
It was used BAT-0.9.4. mtf model: apriori ,Gauss,flat,1/sqrt(S). Two channels: PhaseI + PhaseII
PhaseI – 61 EVENTS; FWHM = 4.13 keV
PHASEII – 13 EVENTS; FWHM = 3.29 keV
5 channels: Golden+Silver+BEGe+PhaseI+ + PhaseII
(47+9) EVENTS / 4.26 keV 3 EVENTS / 2.73
2 EVENTS / 4.16 keV
2/24/2021

BAT SENSITIVITY
Poissons in the energy interval 260 keV with line y = 1.417 – 5.742e-4*E
0) Systematics – E, FWHM, Eff
A) full region [ 1930,2190] keV
B) with exclusion of effect region – [2037,2041] keV
C) statistics – 5000 FITS
2/24/2021
GERDA final – per ALL detectors were made 408 partitions, i.e. time intervals with stable resolution and efficiency.
SENSITIVITY = 180 Yyr.

Blue - 2 channels Red-5 channels
2/24/2021

2/24/2021

Summary