Final Results of GERDA on the Search for Neutrinoless Double-
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 Decay

Agostini, M.; Araujo, G. R.; Bakalyarov, A. M.; Balata, M.; Барабанов, И. Р.; Baudis, L.; Bauer, C.; Bellotti, E.; Belogurov, S.; Bettini, A.; Bezrukov, L.; Biancacci, V.; Borowicz, D.; Bossio, E.; Bothe, V.; Brudanin, V.; Brugnera, R.; Caldwell, A.; Cattadori, C.; Chernogorov, A.; Comellato, T.; D’Andrea, V.; Demidova, É. V.; Marco, N. Di; Doroshkevich, E.; Fischer, F.; Fomina, M.; Gangapshev, A. M.; Garfagnini, A.; Gooch, C.; Grabmayr, P.; Gurentsov, V.; Gusev, K.; Hakenmüller, J.; Hemmer, S.; Hiller, R.; Hofmann, W.; Huang, J.; Hult, M.; Инжечик, Л. В.; Csáthy, J. Janicskó; Jochum, J.; Junker, M.; Kazalov, V. V.; Kermaïdic, Y.; Khushbakht, H.; Kihm, T.; Kirpichnikov, I. V.; Klimenko, A.; Kneißl, R.; Knöpfle, K. T.; Kochetov, O.; Kornoukhov, V. N.; Krause, P.; Kuzminov, V. V.; Laubenstein, M.; Lazzaro, A.; Lindner, M.; Lippi, I.; Lubashevskiy, A.; Лубсандоржиев, Б.; Lutter, G.; Macolino, C.; Majorovits, B.; Maneschg, W.; Manzanillas, L.; Miloradovic, M.; Mingazheva, R.; Misiaszek, M.; Moseev, P.; Müller, Y.; Nemchenok, I.; Panas, K.; Pandola, L.; Pelczar, K.; Pertoldi, L.; Piseri, P.; Pullia, A.; Ransom, C.; Rauscher, L.; Riboldi, S.; Rumyantseva, N.; Sada, Cinzia; Salamida, F.; Schönert, S.; Schreiner, J.; Schütt, M.; Schütz, A.-K.; Schulz, O.; Schwarz, M.; Schwingenheuer, B.; Selivanenko, O.; Shevchik, E.; Shirchenko, M.; Shtembari, L.; Simgen, H.; Smolnikov, A.; Stukov, D.; Vasenko, A. A.; Veresnikova, A.; Vignoli, C.; Sturm, K. von; Wester, T.; Wiesinger, Christoph; Wójcik, Marcin; Yanovich, E.; Zatschler, Birgit; Zhitnikov, I.; Жуков, С. В.; Zinatulina, D.; Zschocke, A.; Zsigmond, Anna Julia; Zuber, Κ.; Zuzel, G.

doi:10.1103/physrevlett.125.252502

Cited by 264 publications

(166 citation statements)

References 48 publications

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“…The highest experimental values on the lower limits of the half-lives related to 0ν2β decay for 48 [36], and 150 Nd [37] are shown in Figure 1 (red circles). The sensitivity of the experiments with enriched crystals reached the level of 10 24 -10 26 years for some 2β channels for different nuclides that are close to the theoretical estimations allowing to calculate the upper limits on the effective mass, ‹m υ ›, of the Majorana neutrino at the level of ‹m υ ›~0.1-0.6 eV; see [38] for a review and the results obtained in the experimental works [28,35,36].…”

Section: Introductionsupporting

confidence: 68%

Enriched Crystal Scintillators for 2β Experiments

Polischuk

2021

Physics

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The investigation of 2β decay is an important issue in modern physics, allowing the test of the Standard Model of elementary particles and the study of the nature and properties of neutrinos. The crystal scintillators, especially made of isotopically-enriched materials, are powerful detectors for 2β decay experiments thanks to the high radiopurity level and the possibility to realize the calorimetric “source = detector” approach with a high detection efficiency. For the moment, the 2ν2β processes have been observed at the level of 1019–1024 years with enriched crystals; the sensitivity to the 0ν mode have reached the level of 1024–1026 years in some decay channels for different nuclides allowing one to calculate the upper limits on the effective mass of the Majorana neutrino at the level of 0.1–0.6 eV. The paper is intended to be a review on the latest results to investigate 2β processes with crystal scintillators enriched in 48Ca, 106Cd, and 116Cd.

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Section: Introductionsupporting

confidence: 68%

Enriched Crystal Scintillators for 2β Experiments

Polischuk

2021

Physics

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“…The discovery of neutrino oscillations brought the topic back to the debate of the scientific community and has been driving theoretical and experimental efforts. Promising experiments to establish the Majorana or Dirac nature of neutrinos are presently conceived of by searching for the neutrinoless double beta (0νββ) decay in nuclei such as 48 Ca, 76 Ge, 116 Cd and 130 Te, 136 Xe, with half-lives higher than 10 25 y [2][3][4]. The observation of the 0νββ decay would prove the Majorana nature of neutrinos, and the measurement of the half-life would allow for the determination of the effective neutrino mass, once appropriate nuclear matrix elements (NMEs) are accurately known [5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Initial State Interaction for the 20Ne + 130Te and 18O + 116Sn Systems at 15.3 AMeV from Elastic and Inelastic Scattering Measurements

et al. 2021

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Double charge exchange (DCE) reactions could provide experimentally driven information about nuclear matrix elements of interest in the context of neutrinoless double-β decay. To achieve this goal, a detailed description of the reaction mechanism is mandatory. This requires the full characterization of the initial and final-state interactions, which are poorly known for many of the projectile-target systems involved in future DCE studies. Among these, we intend to study the 20Ne + 130Te and 18O + 116Sn systems at 15.3 AMeV, which are particularly relevant due to their connection with the 130Te→130Xe and 116Cd→116Sn double-β decays. We measure the elastic and inelastic scattering cross-section angular distributions and compare them with theoretical calculations performed in the optical model, one-step distorted wave Born approximation, and coupled-channel approaches using the São Paulo double-folding optical potential. A good description of the experimental data in the whole explored range of transferred momenta is obtained provided that couplings with the 21+ states of the projectile and target are explicitly included within the coupled-channel approach. These results are relevant also in the analysis of other quasi-elastic reaction channels in these systems, in which the same couplings should be included.

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“…A major advantage of the "source = detector" approach is almost 100% detection efficiency, as well being able to detect alphas and betas directly inside bulky large-mass target material. For example, leading double beta decay experiments have reached sensitivity of over 10 26 y [1,2]. Within this approach, the alpha decay of 180 W with 116 CdWO 4 [3] and 151 Eu with CaF 2 (Eu) [4] crystal scintillators was registered at an experimental sensitivity level of over 10 18 y.…”

Section: Introductionmentioning

confidence: 99%

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

Nagorny

2021

Physics

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Recent progress in Cs2HfCl6 (CHC) crystal production achieved within the last five years is presented. Various aspects have been analyzed, including the chemical purity of raw materials, purification methods, optimization of the growth and thermal conditions, crystal characterization, defect structure, and internal radioactive background. Large volume, crack-free, and high quality CHC crystals with an ultimate scintillating performance were produced as a result of such extensive research and development (R & D) program. For example, the CHC crystal sample with dimensions ∅23 × 30 mm3 demonstrates energy resolution of 3.2% FWHM at 662 keV, the relative light output at the level of 30,000 ph/MeV and excellent linearity down to 20 keV. Additionally, this material exhibits excellent pulse shape discrimination ability and low internal background of less than 1 Bq/kg. Furthermore, attempts to produce a high quality CHC crystal resulted in research on this material optimization by constitution of either alkali ions (Cs to Tl), or main element (Hf to Zr), or halogen ions (Cl to Br, I, or their mixture in different ratio), as well as doping with various active ions (Te4+, Ce3+, Eu3+, etc.). This leads to a range of new established scintillating materials, such as Tl2HfCl6, Tl2ZrCl6, Cs2HfCl4Br2, Cs2HfCl3Br3, Cs2ZrCl6, and Cs2HfI6. To exploit the whole potential of these compounds, detailed studies of the material’s fundamental properties, and understanding of the variety of the luminescence mechanisms are required. This will help to understand the origin of the high light yield and possible paths to further extend it. Perspectives of CHC crystals and related materials as detectors for rare nuclear processes are also discussed.

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Final Results of GERDA on the Search for Neutrinoless Double- β Decay

Cited by 264 publications

References 48 publications

Enriched Crystal Scintillators for 2β Experiments

Enriched Crystal Scintillators for 2β Experiments

Initial State Interaction for the 20Ne + 130Te and 18O + 116Sn Systems at 15.3 AMeV from Elastic and Inelastic Scattering Measurements

Novel Cs2HfCl6 Crystal Scintillator: Recent Progress and Perspectives

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