The IGEX experiment reexamined: A response to the critique of Klapdor-Kleingrothaus, Dietz, and Krivosheina

Aalseth, Craig E.; Avignone, F. T.; Brodzinski, R. L.; Cebrián, S.; Garcı́a, E.; Gonzales, David A.; Hensley, W.K.; Irastorza, I.G.; Kirpichnikov, I. V.; Klimenko, A.; Miley, Harry S.; Morales, A.; Morales, J.; Solórzano, A. Ortíz de; Osetrov, S. B.; Pogosov, V.S.; Puimedón, J.; Reeves, J.H.; Sarsa, M.L.; Smolnikov, A.; Старостин, А. С.; Tamanyan, A.G.; Vasenko, A. A.; Vasiliev, S. I.; Villar, J.A.

doi:10.1103/physrevd.70.078302

Cited by 80 publications

(67 citation statements)

References 28 publications

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“…In Phase I, five semicoaxial diodes from the former Heidelberg-Moscow (HDM) experiment (named ANG 1-ANG 5) [9] and three from the IGEX experiment (named RG 1-RG 3) [10] are deployed. For Phase II, 30 new detectors of BEGe type [11] have been produced of which five have already been deployed for part of Phase I (GD32B, GD32C, GD32D, GD35B and GD35C).…”

Section: Introductionmentioning

confidence: 99%

Pulse shape discrimination for Gerda Phase I data

et al. 2013

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The GERDA experiment located at the Laboratori Nazionali del Gran Sasso of INFN searches for neutrinoless double beta (0νββ) decay of 76 Ge using germanium diodes as source and detector. In Phase I of the experiment eight semi-coaxial and five BEGe type detectors have been deployed. The latter type is used in this field of research for the first time. All detectors are made from material with enriched 76 Ge fraction. The experimental sensitivity can be improved by analyzing the pulse shape of the detector signals with the aim to reject background events. This Page 2 of 17 Eur. Phys. J. C (2013) 73:2583 paper documents the algorithms developed before the data of Phase I were unblinded. The double escape peak (DEP) and Compton edge events of 2.615 MeV γ rays from 208 Tl decays as well as two-neutrino double beta (2νββ) decays of 76 Ge are used as proxies for 0νββ decay.For BEGe detectors the chosen selection is based on a single pulse shape parameter. It accepts 0.92 ± 0.02 of signal-like events while about 80 % of the background events at Q ββ = 2039 keV are rejected.For semi-coaxial detectors three analyses are developed. The one based on an artificial neural network is used for the search of 0νββ decay. It retains 90 % of DEP events and rejects about half of the events around Q ββ . The 2νββ events have an efficiency of 0.85±0.02 and the one for 0νββ decays is estimated to be 0.90 +0.05 −0.09 . A second analysis uses a likelihood approach trained on Compton edge events. The third approach uses two pulse shape parameters. The latter two methods confirm the classification of the neural network since about 90 % of the data events rejected by the neural network are also removed by both of them. In general, the selection efficiency extracted from DEP events agrees well with those determined from Compton edge events or from 2νββ decays.

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Section: Introductionmentioning

confidence: 99%

Pulse shape discrimination for Gerda Phase I data

et al. 2013

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“…For Phase I all eight detectors from the former HDM and IGEX experiments [29][30][31][32][33] were refurbished and redeployed. For Phase II new material amounting to 50 kg enr GeO 2 and 34 kg of dep GeO 2 was purchased.…”

Section: The Germanium Detectorsmentioning

confidence: 99%

“…There is a considerable history to the use of 76 Ge for the search for 0νββ decay. After initial experiments [18][19][20][21][22][23][24][25][26][27][28], the Heidelberg-Moscow (HDM) collaboration [29] and IGEX [30][31][32][33] were the driving forces in this field setting the most stringent limits. In 2004 a subgroup of the HDM collaboration [34] claimed a 4σ significance for the observation of 0νββ decay with a best value of T 1/2 = 1.19 · 10 25 yr; the quoted 3σ range is (0.…”

Section: Introductionmentioning

confidence: 99%

The Gerda experiment for the search of 0νββ decay in 76Ge

et al. 2013

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“…Eight p-type high purity germanium (HPGe) semi-coaxial detectors from the HdM [3] and IGEX [4] experiments were refurbished and used as the main GERDA Phase I detectors. They are enriched to ∼86% in 76 Ge and have a total mass of 17 kg.…”

Section: The Gerda Experimentsmentioning

confidence: 99%

“…Additionally, it would prove that neutrinos have a Majorana mass component. The half-life limits set so far on 0νββ decay for 76 Ge lie in the range of (1.6−1.9)×10 25 years [3][4][5]. In 2004, a subgroup of the HdM collaboration claimed an observation of 0νββ decay [6], reporting a half-life of T 25 years.…”

Section: Introductionmentioning

confidence: 99%

Results on neutrinoless double beta decay of⁷⁶Ge from the GERDA experiment

Palioselitis

2015

EPJ Web of Conferences

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Abstract. The Germanium Detector Array (GERDA) experiment is searching for neutrinoless double beta (0νββ) decay of 76 Ge, a lepton number violating nuclear process predicted by extensions of the Standard Model. GERDA is an array of bare germanium diodes immersed in liquid argon located at the Gran Sasso National Laboratory (LNGS) in Italy. The results of the GERDA Phase I data taking with a total exposure of 21.6 kg yr and a background index of 0.01 cts/(keV kg yr) are presented in this paper. No signal was observed and a lower limit of T 0ν 1/2 > 2.1 × 10 25 yr (90% C.L.) was derived for the half-life of the 0νββ decay of 76 Ge. Phase II of the experiment aims to reduce the background around the region of interest by a factor of ten.

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The IGEX experiment reexamined: A response to the critique of Klapdor-Kleingrothaus, Dietz, and Krivosheina

Cited by 80 publications

References 28 publications

Pulse shape discrimination for Gerda Phase I data

Pulse shape discrimination for Gerda Phase I data

The Gerda experiment for the search of 0νββ decay in 76Ge

Results on neutrinoless double beta decay of⁷⁶Ge from the GERDA experiment

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The IGEX experiment reexamined: A response to the critique of Klapdor-Kleingrothaus, Dietz, and Krivosheina

Cited by 80 publications

References 28 publications

Pulse shape discrimination for Gerda Phase I data

Pulse shape discrimination for Gerda Phase I data

The Gerda experiment for the search of 0νββ decay in 76Ge

Results on neutrinoless double beta decay of76Ge from the GERDA experiment

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Results on neutrinoless double beta decay of⁷⁶Ge from the GERDA experiment