A. A. Klimenko

Recent results of the IGEX 76Ge double-beta decay experiment

The International Germanium Experiment (IGEX) has now analyzed 117 mol yr of data from its isotopically enriched (86% 76Ge) germanium detectors. Applying pulse shape discrimination (PSD) to the more recent data, the lower bound on the half-life for neutrinoless double-beta decay of 76Ge is deduced: T1/2(0ν)>1.57×1025 yr (90% C.L.). This corresponds to an upper bound on the Majorana neutrino mass parameter, 〈mν〉, between 0.33 eV and 1.35 eV depending on the choice of theoretical nuclear matrix elements used in the analysis.

Double-Beta Decay of 150Nd and 76Ge to Excited States

New results of experimental search for double beta decay of 76Ge (2νββ) and 150Nd (0ν + 2ν) to excited states of the daughter nuclei are presented. Data from 228 days of measurements performed with four HPGe detectors in the low background laboratory of Baksan neutrino observatory yield new limits on life-times T1/2(0+→ 0+1)≥6.2×1021} yr at 90% C.L. for transition of 76Ge to 0+1 level of 76Se and T1/2(0+→ 0+1)≥1.5×1020 yr at 90% C.L. for transition of 150Nd to 0+1 level of 150Sm.

Search for double electron capture of 106Cd

AbstractA search for double electron capture of 106Cd was performed at the Modane Underground Laboratory (4800 m w.e.) using a low-background and high-sensitivity multidetector spectrometer TGV-2 (Telescope Germanium Vertical). New limits on β+/EC, EC/EC decays of 106Cd were obtained from preliminary calculations of experimental data accumulated for 4800 h of measurement of 10 g of 106Cd with enrichment of 75%. They are n% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVy0de9vqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaDa% aaleaadaWcgaqaaiaaigdaaeaacaaIYaaaaaqaaiaaikdacqaH9oGB% cqaHYoGydaahaaadbeqaaiabgUcaRaaaieaaliaa-veacaWFdbaaaa% aa!3EF4!nn

Fast-neutron-flux measurements in the underground facilities at Baksan

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Search for double beta decay of 106Cd in the TGV-2 experiment

n > 9.1 × 1018 yr, n% MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVy0de9vqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaDa% aaleaadaWcgaqaaiaaigdaaeaacaaIYaaaaaqaaiaaikdacqaH9oGB% daWcgaqaaGqaaiaa-veacaWFdbaabaGaa8xraiaa-neaaaaaaaaa!3DD8!nn

The low background spectrometer TGV II for double beta decay measurements

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