First evidence for lepton number violation: The Ge-76 double beta experiment in 
Gran Sasso 1990-2003

Klapdor-Kleingrothaus, H.V.; Dietz, A.; Krivosheina, I.V.; Chkvorets, O.

doi:10.1016/j.nima.2003.12.013

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First evidence for lepton number violation: The Ge-76 double beta experiment in Gran Sasso 1990-2003

Klapdor-Kleingrothaus, H., Dietz, A., Krivosheina, I., & Chkvorets, O. (2004). First evidence for lepton number violation: The Ge-76 double beta experiment in Gran Sasso 1990-2003. Nuclear Instruments and Methods in Physics Research A, 522, 371-406. doi:10.1016/j.nima.2003.12.013.

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Item Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-8C9F-7 Version Permalink: https://hdl.handle.net/11858/00-001M-0000-0011-8CA0-1

Genre: Journal Article

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Creators:
Klapdor-Kleingrothaus, H.V.¹, Author
Dietz, A.¹, Author
Krivosheina, I.V.¹, Author
Chkvorets, O.², Author

Affiliations:
1Prof. Dirk Schwalm, Emeriti, MPI for Nuclear Physics, Max Planck Society, ou_907546
2Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society, ou_904549

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Free keywords: Author Keywords: Neutrino mass and mixing; Beta decay; Double beta decay; HEIDELBERG – MOSCOW experiment; High purity; Ge-detectors; Majorana neutrino

Abstract: Data acquisition in a long-running underground experiment has its specific experimental challenges, concerning data acquisition, stability of the experiment and background reduction. These problems are addressed here for the HEIDELBERG–MOSCOW experiment, which collected data in the period August 1990–May 2003. The measurement and the analysis of the data are presented. The duty cycle of the experiment was ~ 80%, and the collected statistics is 71.7 kg year. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/kg year keV. The two-neutrino accompanied half-life is determined on the basis of more than 100 000 events. The confidence level for the neutrinoless signal has been improved to a 4σ level.

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Language(s): eng - English

Dates: Date issued: 2004-01-23

Publication Status: Issued

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Rev. Type: Peer

Identifiers: eDoc: 290735
DOI: 10.1016/j.nima.2003.12.013

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Title: Nuclear Instruments and Methods in Physics Research A

Alternative Title : NIM A

Source Genre: Journal

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Pages: - Volume / Issue: 522 Sequence Number: - Start / End Page: 371 - 406 Identifier: -