Latest Results from the Heidelberg-Moscow Double-Beta-Decay Experiment

Klapdor‐Kleingrothaus, H. V.; Dietz, A.; Baudis, L.; Heusser, G.; Krivosheina, I. V.; Kolb, St.; Majorovits, B.; Paes, H.; Strecker, H.; Alexeev, V.I.; Balysh, A.; Bakalyarov, A. M.; Belyaev, S. T.; Lebedev, V. I.; Жуков, С. В.

doi:10.1007/978-3-642-56643-1_47

Cited by 51 publications

(64 citation statements)

References 37 publications

(27 reference statements)

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“…1 and is extensively discussed in 7 . The HEIDELBERG-MOSCOW experiment using the largest source strength of 11 kg of enriched 76 Ge (enrichment 86%) in form of five HP Ge-detectors is running since August 1990 in the Gran-Sasso underground laboratory 7,3,4,1,32,28 , and is since nine years now the most sensitive double beta experiment worldwide.…”

Section: Evidence For the Neutrinoless Decay Modementioning

confidence: 99%

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Klapdor‐Kleingrothaus

2003

Foundations of Physics

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Home-page: http://www.mpi-hd.mpg.de.non acc/ Double beta decay is indispensable to solve the question of the neutrino mass matrix together with ν oscillation experiments. Recent analysis of the most sensitive experiment since nine years -the HEIDELBERG-MOSCOW experiment in Gran-Sasso -yields a first indication for the neutrinoless decay mode. This result is the first evidence for lepton number violation and proves the neutrino to be a Majorana particle. We give the present status of the analysis in this report. It excludes several of the neutrino mass scenarios allowed from present neutrino oscillation experiments -only degenerate scenarios and those with inverse mass hierarchy survive. This result allows neutrinos to still play an important role as dark matter in the Universe. To improve the accuracy of the present result, considerably enlarged experiments are required, such as GENIUS. A GENIUS Test Facility has been funded and will come into operation by early 2003.

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Section: Evidence For the Neutrinoless Decay Modementioning

confidence: 99%

Untitled

Klapdor‐Kleingrothaus

2003

Foundations of Physics

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“…The observation of this lepton-violating nuclear process will thus be a major discovery with broad impact on many fields of Physics. To the date there has been only one claim of observation of the ββ0ν decay in 76 Ge by The Heilderberg-Moscow experiment [7]. This claim has been ruled out this year by the limit on the ββ0ν decay of 136 Xe established by the EXO-200 and KamLAND-Zen experiments, whose combined results give T 0ν 1/2 > 3.4 × 10 25 years at 90% confidence level.…”

Section: Introductionmentioning

confidence: 90%

Characterization of UV-enhanced SiPMs for imaging in a high pressure xenon electroluminescent TPC

Yahlali

Fernandes

Lorca

2013

2013 3rd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications (ANIMM

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The possibility of recording charged particle tracks in an electroluminescent xenon gas TPC is investigated using a SiPM-based tracking system, operated in the demonstrator prototype of the NEXT-100 ββ decay experiment. The tracks of the ββ0ν events from the decay of the 136 Xe isotope have a distinctive topology, which allows their discrimination against single-electron events from the natural radioactivity that populates the region of interest of the neutrinoless decay in the ββ energy spectrum. Combined to the near-intrinsic energy resolution of the gaseous detector, this tracking capability provides a powerful background rejection tool for the search of the neutrinoless ββ decay aimed by the experiment.The NEXT-100 detector concepts and sensitivity and the first results of its demonstrator prototype are presented. The characterization studies relevant for the operation of UV-enhanced SiPMs used for imaging in an electroluminescent TPC are reviewed.

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“…Among the first generation of 0νββ decay projects, the Heidelberg-Moskow (HdM) experiment set the most stringent limit with m ββ <0.35 eV (90% C.L.) in 2001 [5], followed by a controversial claim of observation by a subgroup of the same experiment with m ββ ≈ (0.24-0.58) eV [6]. Table 1 summarizes the 0νββ decay experiments which are currently operational or under construction, and several on-going R&D projects.…”

Section: Introductionmentioning

confidence: 99%