Measurement of the half-life of the two-neutrino double beta decay of<sup>76</sup>Ge with the GERDA experiment

Agostini, M.; Allardt, M.; Andreotti, E.; Bakalyarov, A. M.; Balata, M.; Барабанов, И. Р.; Heider, Marik Barnabé; Barros, N.; Baudis, L.; Bauer, C.; Becerici-Schmidt, N.; Bellotti, E.; Belogurov, S.; Belyaev, S. T.; Benato, G.; Bettini, A.; Bezrukov, L.; Bode, T.; Brudanin, V.; Brugnera, R.; Budjáš, D.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Cossavella, F.; Demidova, É. V.; Denisov, A. N.; Domula, A.; Egorov, V.; Falkenstein, R.; Ferella, A. D.; Freund, K.; Froborg, F.; Frodyma, N.; Gangapshev, A. M.; Garfagnini, A.; Gazzana, S.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Guthikonda, K. K.; Hampel, W.; Hegai, A.; Heisel, M.; Hemmer, S.; Heusser, G.; Hofmann, W.; Hult, M.; Инжечик, Л. В.; Ioannucci, L.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kianovsky, S.; Kirpichnikov, I. V.; Kirsch, A.; Klimenko, A.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lebedev, V. I.; Lehnert, B.; Liao, H.; Lindner, M.; Lippi, I.; Liu, X; Lubashevskiy, A.; Лубсандоржиев, Б.; Lutter, G.; Machado, A. A.; Majorovits, B.; Maneschg, W.; Nemchenok, I.; Nisi, S.; O’Shaughnessy, C.; Pandola, L.; Pelczar, K.; Peraro, L; Pullia, A.; Riboldi, S.; Ritter, F.; Sada, Cinzia; Salathe, M.; Schmitt, C.; Schönert, S.; Schreiner, J.; Schulz, O.; Schwingenheuer, B.; Shevchik, E.; Shirchenko, M.; Simgen, H.; Smolnikov, A.; Stančo, L.; Strecker, H.; Tarka, M.; Ur, C. A.; Vasenko, A. A.; Volynets, O.; Sturm, K. von; Walter, Michael; Wegmann, A.; Wójcik, Marcin; Yanovich, E.; Zavarise, P.; Zhitnikov, I.; Жуков, С. В.; Zinatulina, D.; Zuber, Κ.; Zuzel, G.

doi:10.1088/0954-3899/40/3/035110

Cited by 53 publications

(21 citation statements)

References 65 publications

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“…This matrix element is not often computed in the literature, and in Ref. [22] bounds on the righthanded operator C (6) VR were obtained setting M T,AA = 0. If we naively assume that the ratio between the GT-AA and T-AA matrix elements is the same in heavy and light nuclei, a T-AA matrix element of the size reported in Table I would affect the bounds on C The results discussed in this section, summarized in Table I, deal mostly with NMEs involved in light Majorana-neutrino exchange.…”

Section: A Light Majorana Neutrino Exchangementioning

confidence: 99%

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Neutrinoless double- β decay matrix elements in light nuclei

Pastore¹,

Carlson²,

Cirigliano³

et al. 2018

Phys. Rev. C

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We present the first ab initio calculations of neutrinoless double beta decay matrix elements in A = 6-12 nuclei using Variational Monte Carlo wave functions obtained from the Argonne v18 two-nucleon potential and Illinois-7 three-nucleon interaction. We study both light Majorana neutrino exchange and potentials arising from a large class of multi-TeV mechanisms of lepton number violation. Our results provide benchmarks to be used in testing many-body methods that can be extended to the heavy nuclei of experimental interest. In light nuclei we have also studied the impact of two-body short range correlations and the use of different forms for the transition operators, such as those corresponding to different orders in chiral effective theory.

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Section: A Light Majorana Neutrino Exchangementioning

confidence: 99%

“…For certain even-even nuclei the single β decay is energetically forbidden. In many such nuclei, the Standard Model allowed two-neutrino double beta decay has already been observed [3][4][5][6][7][8] (see Ref. [9] for older references), and the search for the LNV neutrinoless mode is being pursued by many collaborations worldwide.…”

Section: Introductionmentioning

confidence: 99%

Neutrinoless double- β decay matrix elements in light nuclei

Pastore¹,

Carlson²,

Cirigliano³

et al. 2018

Phys. Rev. C

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“…42 K. A cosmogenically produced isotope in LAr is 42 Ar (T 1/2 = 32.9(11) yr) which decays to 42 K. The distribution of 42 K inside the LAr is likely to be inhomogeneous due to drift of the ionized decay products induced by the electric field (generated by high-voltage cables and detectors) and convection. 42 K decays to 42 Ca via β decay with a half-life of 12.355 (7) h and a Q-value of 3525.22(18) keV, well above Q ββ . For the β particle to be detected the decay needs to happen within a distance of a few centimeters 1 to the detector surface.…”

Section: Background Expectationmentioning

confidence: 99%

“…An explanation for 42 K on the p + contact being rejected for the M1-enrBEGe data set but potentially present in the M1-enrCoax data can be the specific bore-hole geometry of the semi-coaxial detectors. 42 K produced inside the hole cannot easily escape and is trapped close to the p + contact.…”

Section: Jhep03(2020)139mentioning

confidence: 99%

“…Several systematic uncertainties arise from the Monte Carlo simulation framework. Uncertainties due to the Geant4 model of particle interactions and propagation were estimated to be of the order of 2 % in previous publications [42,43]. Approximations in the implementation of the Gerda setup are conservatively estimated within a 1-2 % uncertainty range.…”

Section: Jhep03(2020)139mentioning

confidence: 99%

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Modeling of GERDA Phase II data

Agostini¹,

Bakalyarov²,

Balata³

et al. 2020

J. High Energ. Phys.

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The GERmanium Detector Array (Gerda) experiment at the Gran Sasso underground laboratory (LNGS) of INFN is searching for neutrinoless double-beta (0νββ) decay of 76 Ge. The technological challenge of Gerda is to operate in a "backgroundfree" regime in the region of interest (ROI) after analysis cuts for the full 100 kg·yr target exposure of the experiment. A careful modeling and decomposition of the full-range energy spectrum is essential to predict the shape and composition of events in the ROI around Q ββ for the 0νββ search, to extract a precise measurement of the half-life of the doublebeta decay mode with neutrinos (2νββ) and in order to identify the location of residual impurities. The latter will permit future experiments to build strategies in order to further lower the background and achieve even better sensitivities. In this article the background decomposition prior to analysis cuts is presented for Gerda Phase II. The background model fit yields a flat spectrum in the ROI with a background index (BI) of 16.04 +0.78 −0.85 · 10 −3 cts/(keV·kg·yr) for the enriched BEGe data set and 14.68 +0.47 −0.52 · 10 −3 cts/(keV·kg·yr) for the enriched coaxial data set. These values are similar to the one of Phase I despite a much larger number of detectors and hence radioactive hardware components.

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Neutrino masses

Weinheimer

Zuber

2013

Annalen der Physik

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The various experiments on neutrino oscillation evidence that neutrinos have indeed non-zero masses but cannot provide the absolute neutrino mass scale. This scale of neutrino masses is very important for understanding the evolution and the structure formation of the universe as well as for nuclear and particle physics beyond the present Standard Model. Complementary to deducing constraints on the sum of all neutrino masses from cosmological observations, two different methods to determine the neutrino mass scale in the laboratory are pursued: the search for neutrinoless double β-decay and the direct neutrino mass search by investigating single β-decays or electron captures. The former method is not only sensitive to neutrino masses but also probes the Majorana character of neutrinos and thus lepton number violation with high sensitivity. Currently quite a few experiments using different techniques are being constructed, commissioned, or are even running, which aim for a sensitivity on the neutrino mass of O(100) meV. The principal methods and these experiments are discussed in this short review.

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Measurement of the half-life of the two-neutrino double beta decay of⁷⁶Ge with the GERDA experiment

Cited by 53 publications

References 65 publications

Neutrinoless double- β decay matrix elements in light nuclei

Neutrinoless double- β decay matrix elements in light nuclei

Modeling of GERDA Phase II data

Neutrino masses

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Measurement of the half-life of the two-neutrino double beta decay of76Ge with the GERDA experiment

Cited by 53 publications

References 65 publications

Neutrinoless double- β decay matrix elements in light nuclei

Neutrinoless double- β decay matrix elements in light nuclei

Modeling of GERDA Phase II data

Neutrino masses

Contact Info

Product

Resources

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Measurement of the half-life of the two-neutrino double beta decay of⁷⁶Ge with the GERDA experiment