Results on 82Se 2νββ with CUPID-0 Phase I
| Autor: | S. S. Nagorny, Angelo Cruciani, Marco Pallavicini, S. Pirro, Oliviero Cremonesi, C. Rusconi, D. Orlandi, O. Azzolini, V. Pettinacci, Massimiliano Clemenza, G. Keppel, I. Dafinei, Davide Chiesa, Jeffrey W. Beeman, Stefano Nisi, C. Brofferio, S. Di Domizio, C. Gotti, Laura Cardani, C. Bucci, Miriam Lucio Martinez, M. Vignati, A. S. Zolotarova, C. Nones, A. Puiu, N. Casali, Simone Capelli, L. Pagnanini, Paolo Carniti, F. Bellini, L. Gironi, G. Pessina, E. Previtali, M. Pavan, P. Gorla, F. Ferroni, C. Tomei, M. Beretta, K. Schäffner, Massimiliano Nastasi, A. Giuliani, S. Pozzi, M. Biassoni, L. Pattavina |
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| Přispěvatelé: | Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay |
| Rok vydání: | 2020 |
| Předmět: |
History
Particle physics media_common.quotation_subject Electron [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] 01 natural sciences Asymmetry crystal Education temperature: low Double beta decay 0103 physical sciences [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] double-beta decay: (2neutrino) Beta (velocity) 010306 general physics Absolute zero media_common Physics nucleus: decay background 010308 nuclear & particles physics nucleus: many-body problem Fundamental interaction Computer Science Applications electron: spectrum intermediate state Neutrino asymmetry Radioactive decay |
| Zdroj: | J.Phys.Conf.Ser. 27th International Nuclear Physics Conference 27th International Nuclear Physics Conference, Jul 2019, Glasgow, United Kingdom. pp.012025, ⟨10.1088/1742-6596/1643/1/012025⟩ |
| ISSN: | 1742-6596 1742-6588 |
| DOI: | 10.1088/1742-6596/1643/1/012025 |
| Popis: | The nucleus is an extraordinarily complex object where fundamental forces are at work. The solution of this many-body problem has challenged physicists for decades: several models with complementary virtues and flaws have been adopted, none of which has a universal predictive capability. Double beta decay is a second order weak nuclear decay whose precise measurement might steer fundamental improvements in nuclear theory. Its knowledge paves the way to a much better understanding of many body nuclear dynamics and clarifies, in particular, the role of multiparticle states. This is a useful input to a complete understanding of the dynamics of neutrino-less double beta decay, the chief physical process whose discovery may shed light to matter-antimatter asymmetry of the universe and unveil the true nature of neutrinos. Here, we report the study of 2νββ-decay in 82Se with the CUPID-0 detector, an array of ZnSe crystals maintained at a temperature close to ‘absolute zero’ in an ultralow background environment. Thanks to the unprecedented accuracy in the measurement of the two electrons spectrum, we prove that the decay is dominated by a single intermediate state. We obtain also the most precise value for the 82Se 2νββ-decay half-life of T 1 / 2 2 ν = [ 8.6 + 0.2 − 0.1 ] × 10 19 yr. |
| Databáze: | OpenAIRE |
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