Heidelberg-Moscow Double Beta Decay Experiment (76Ge)

Data acquisition and analysis of the 76Ge double beta experiment in Gran Sasso 1990-2003

4.2σ (99.9973% c.l.) evidence of neutrinoless double beta decay
\langle m \rangle = (0.2-0.6) \mathrm{eV} (99.73% c.l.) with the best value of 0.4 eV
±50% uncertainty of the nuclear matrix element => \langle m \rangle = (0.1-0.9) \mathrm{eV}

(25 February 2004)

References

References are divided in
  1 - Articles

  2 - Evidence

  3 - Evidence - Critics

  4 - Evidence - Conference Proceedings

The references in each group are listed in approximate inverted chronological order.
Click on the reference label to search it in Spires.

1 - Articles

[1-1]
Results of the experiment on investigation of Germanium-76 double beta decay. Experimental data of Heidelberg-Moscow collaboration November 1995 - August 2001, A.M. Bakalyarov et al. (C03-06-23.1), Phys. Part. Nucl. Lett. 2 (2005) 77, arXiv:hep-ex/0309016.
[1-2]
Latest results from the HEIDELBERG-MOSCOW double beta decay experiment, Klapdor-Kleingrothaus, H. V. et al., Eur. Phys. J. A12 (2001) 147-154.
Comment: Lower bound for the neutrinoless double-beta decay half-life of 76Ge: T1/2 > 1.9 × 1025 y at 90% CL. The corresponding upper bound for the effective neutrino mass is <m> < 0.35 eV. (C.G.).
[1-3]
Heidelberg - Moscow beta beta experiment with Ge-76: Full setup with five detectors, Gunther, M. et al., Phys. Rev. D55 (1997) 54-67.

2 - Evidence

[2-1]
Klapdor's claim for the observation of the neutrinoless double beta-decay of Ge-76. Analysis and corrections, Kirpichnikov I.V., arXiv:1006.2025, 2010.
[2-2]
The evidence for the observation of 0nu beta beta decay: The identification of 0nu beta beta events from the full spectra, Klapdor-Kleingrothaus, H. V., Krivosheina, I. V., Mod. Phys. Lett. A21 (2006) 1547-1566.
From the abstract: Two different methods of pulse shape analysis have been used to select potential 0\nu\beta\beta events from the \gamma-background. Both methods lead to selections of events at Q_{\beta\beta} with almost no \gamma-background. The observed line at Q_{\beta\beta} is identified as a 0\nu\beta\beta signal. It has a confidence level of more than 6\sigma.
[2-3]
Search for neutrinoless double beta decay with enriched 76Ge in Gran Sasso 1990-2003, H.V. Klapdor-Kleingrothaus, I.V. Krivosheina, A. Dietz, O. Chkvorets, Phys. Lett. B586 (2004) 198-212, arXiv:hep-ph/0404088.
[2-4]
Search For Neutrinoless Double Beta Decay With Enriched 76Ge 1990-2003 - HEIDELBERG-MOSCOW-Experiment, H.V. Klapdor-Kleingrothaus et al., arXiv:hep-ph/0404062, 2004. INFN, Laboratori Nazionali del Gran Sasso, Annual Report 2003 (2004).
[2-5]
Data acquisition and analysis of the 76Ge double beta experiment in Gran Sasso 1990-2003, H.V. Klapdor-Kleingrothaus, A. Dietz, O. Chkvorez, I.V. Krivosheina, Nucl. Instrum. Meth. A522 (2004) 371-406, arXiv:hep-ph/0403018.
From the abstract: the confidence level for the neutrinoless signal has been improved.
From the article: we confirm, with 4.2σ (99.9973% c.l.) probability, our claim from 2001 [,,2-14,,] of first evidence for the neutrinoless double beta decay mode.
...
Using the nuclear matrix element from Refs.[,], we conclude from the half-life given above the effective mass \langle m \rangle to be \langle m \rangle = (0.2-0.6) \mathrm{eV} (99.73% c.l.) with the best value of 0.4 eV.
...
Allowing conservatively for an uncertainty of the nuclear matrix element of ±50%, the range for the effective mass may widen to \langle m \rangle = (0.1-0.9) \mathrm{eV} (99.73% c.l.).
[2-7]
From nuclear physics to physics beyond the standard model: first evidence for lepton number violation and the Majorana character of neutrinos, Klapdor-Kleingrothaus, H. V., Int. J. Mod. Phys. D13 (2004) 2107-2126. http://www.worldscinet.com/ijmpd/13/preserved-docs/1310/S0218271804006656.pdf.
[2-7]
From nuclear physics to physics beyond the standard model: first evidence for lepton number violation and the Majorana character of neutrinos, Klapdor-Kleingrothaus, H. V., Int. J. Mod. Phys. D13 (2004) 2107-2126.
[2-8]
Neutrinoless double beta decay: Status of evidence, Klapdor-Kleingrothaus, H. V., Dietz, A., Krivosheina, I. V., Found. Phys. 32 (2002) 1181-1223, arXiv:hep-ph/0302248.
[2-9]
One Year of Evidence for Neutrinoless Double Beta Decay, H.V. Klapdor-Kleingrothaus, arXiv:hep-ph/0302237, 2003.
[2-10]
Reply to the comment on "Evidence for neutrinoless double beta decay". (Mod. Phys. Lett. A16 (2001) 2409), Harney, H. L., arXiv:hep-ph/0205293, 2002.
[2-11]
Reply to a comment of article "Evidence for neutrinoless double beta decay", Klapdor-Kleingrothaus, H. V., arXiv:hep-ph/0205228, 2002.
[2-12]
Evidence for Neutrinoless Double Beta Decay, Klapdor-Kleingrothaus, H. V., Dietz, A., Harney, H. L., Krivosheina, I. V., Mod. Phys. Lett. A16 (2001) 2409-2420, arXiv:hep-ph/0201231.
Comment: Evidence in favor of the observation of neutrinoless double-beta decay of 76Ge is claimed, with T1/2 = (0.8-18.3) × 1025 y at 95% CL and best value T1/2 = 1.5 × 1025 y. The corresponding effective neutrino mass is <m> = 0.11-0.56 eV and best value <m> = 0.39 eV. (C.G.).
[2-14]
First evidence for neutrinoless double beta decay, Klapdor-Kleingrothaus, H. V., Dietz, A., Krivosheina, I. V., Part. Nucl. Lett. 110 (2002) 57-79.
[2-14]
First evidence for neutrinoless double beta decay, Klapdor-Kleingrothaus, H. V., Dietz, A., Krivosheina, I. V., Part. Nucl. Lett. 110 (2002) 57-79.

3 - Evidence - Critics

[3-1]
Comment on "Evidence for Neutrinoless Double Beta Decay", Aalseth, C. E. et al., Mod. Phys. Lett. A17 (2002) 1475-1478, arXiv:hep-ex/0202018.
Comment: Critics of prominent members of the Double Beta Decay community to the claim in []. (C.G.).
[3-2]
Neutrino oscillations and signals in \beta and (\beta\beta)_{0\nu} experiments, Feruglio, Ferruccio, Strumia, Alessandro, Vissani, Francesco, Nucl. Phys. B637 (2002) 345-377, arXiv:hep-ph/0201291.

4 - Evidence - Conference Proceedings

[4-1]
Lessons after 3 years of running GENIUS-TF in Gran Sasso, Krivosheina, I. V., Klapdor-Kleingrothaus, H. V. (Heidelberg-Moscow and GENIUS), Phys. Scripta T127 (2006) 52-53. 2nd Scandanavian Neutrino Workshop (SNOW 2006), Stockholm, Sweden, 2-6 May 2006.
[4-2]
First Evidence for Neutrinoless Double Beta Decay - and World Status of Double Beta Experiments, Klapdor-Kleingrothaus, Hans Volker, arXiv:hep-ph/0512263, 2005. XI Int. Work. on Neutrino Telescopes, Febr. 22-25, 2005, Venice, Italy.
[4-3]
First evidence for neutrinoless double beta decay, with enriched Ge-76 in Gran Sasso 1990-2003, Klapdor-Kleingrothaus, H. V., Nucl. Phys. Proc. Suppl. 143 (2005) 229-232.
[4-4]
Search for neutrinoless double beta decay with enriched {}^{76}Ge in Gran Sasso, H.V. Klapdor-Kleingrothaus, 2004. Neutrino 2004, 13-19 June 2004, Paris, France. http://neutrino2004.in2p3.fr/slides/thursday/Klapdor/klapdor.html.
[4-5]
First Evidence for Neutrinoless Double Beta Decay, H.V. Klapdor-Kleingrothaus, Found. Phys. 33 (2003) 813, arXiv:hep-ph/0302234. Zacatecas Forum in Physics 2002, 11-13 MAY, 2002, Zacatecas, Mexico.

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Authors:
Carlo Giunti / giunti@to.infn.it
Marco Laveder / marco.laveder@pd.infn.it
Last Update: Fri 10 Feb 2012, day 41 of the year 2012, 09:08:53 UTC