Latest results from the HEIDELBERG-MOSCOW double beta decay experiment

By H. Klapdor-kleingrothaus, A. Dietz, L. Baudis, G. Heusser, I. Krivosheina, B. Majorovits, H. Paes, H. Strecker, V. Alexeev, A. Balysh and 4 more. 2001

557 citations recorded by the source corpus.

Abstract:New results for the double beta decay of 76Ge are presented. They are extracted from data obtained with the HEIDELBERG-MOSCOW experiment, which operates five enriched 76Ge detectors in an extreme low-level environment in the Gran Sasso underground laboratory. The two-neutrino-accompanied double beta decay is evaluated for the first time for all five detectors with a statistical significance of 47.7 kg y resulting in a half-life of T1/22ν = [1.55±0.01(stat)+0.19-0.15(syst)]×1021 y. The lower limit on the half-life of the 0νββ decay obtained with pulse shape analysis is T1/20ν > 1.9×1025(3.1×1025) y with 90% C.L. (68% C.L.) (with 35.5 kg y). This results in an upper limit of the effective Majorana-neutrino mass of 0.35 eV (0.27 eV) using the matrix elements of A. Staudt et al.'s work (Europhys. Lett. 13, 31 (1990)). This is the most stringent limit at present from double beta decay. No evidence for a majoron-emitting decay mode is observed.

Subfields: Nuclear and High Energy Physics, Radiation

View Paper: https://www.semanticscholar.org/paper/2a559d7cc300aebd9ac5e37a57203d595013bee2

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In Nuclear and High Energy Physics

1. S. Antusch
2. Z. Xing
3. W. Rodejohann
4. C. Giunti
5. A. Studenikin
6. Mattias Blennow
7. J. Barry
8. J. Lopez-Pavon

In Radiation

1. C. Giunti
2. J. Barry
3. M. Viel
4. W. Rodejohann
5. S. Antusch
6. J. Lopez-Pavon
7. Enrique Fernandez-Martinez
8. Jonathan Engel

Citations in the corpus

• Neutrinoless Double Beta Decay: 2015 Review (2016, background): “To summarize, caution suggests that we disregard the claim, made in [74, 206, 207], that the transition was observed.”
• Double Beta Decay, Majorana Neutrinos, and Neutrino Mass (2007, methodology): “We will discuss the Majorana experiment first because it will use improved ultra-low background cryostat technology similar to that used in the IGEX experiment, which, except for the copper, was similar to that used in the Heidelberg-Moscow experiment.”
• Neutrino electromagnetic interactions: A window to new physics (2014, result): “0.12− 0.25 eV (90%CL) , (2.83) and combining the results of Heidelberg-Moscow (Klapdor-Kleingrothaus et al., 2001), IGEX (Aalseth et al., 2002) and GERDA (Agostini et al., 2013) with 76Ge, mββ .”