A. V. Salamatin

Search for double beta decay of 48Ca in the TGV experiment

Abstract This Letter describes a collaborative TGV (Telescope Germanium Vertical) study of the double beta decay of 48 Ca with a low-background and high sensitivity Ge multi-detector spectrometer. The results of T 1/2 2 νββ =(4.2 +3.3 −1.3 )×10 19 years and T 1/2 0 νββ >1.5×10 21 years (90% CL) for double beta decay of 48 Ca were found after processing experimental data obtained after 8700 hours of measuring time, using approximately 1 gramme of 48 Ca. The features of a TGV-2 experiment are also presented.

Measurement of the induced pseudoscalar form factor in the capture of polarized muons by Si nuclei

Abstract The observation with high-resolution Ge detectors of the 1229 and 2171 keV gamma-rays emitted after the 28 Si(μ, ν) 28 Al(1 + , 2202 keV) reaction allowed us to determine the nuclear-amplitude ratio x ≡ M(2) M(−1) characteristic of this muon-capture reaction. Using the nuclear-structure dependent evaluation of various correction terms (model of Ciechanowicz), our result x = +0.254±0.034 provides for the induced pseudoscalar coupling g p the ratio g p g a (0.848m μ 2 ) = 3.4 ± 1.0 , to be compared to the PCAC prediction of g p g a = 7 . The model dependence of this apparent quenching remains to be assessed.

DANSS: Detector of the reactor AntiNeutrino based on Solid Scintillator

The DANSS project is aimed at creating a relatively compact neutrino spectrometer which does not contain any flammable or other dangerous liquids and may therefore be located very close to the core of an industrial power reactor. As a result, it is expected that high neutrino flux would provide about 15,000 IBD interactions per day in the detector with a sensitive volume of 1 m3. High segmentation of the plastic scintillator will allow to suppress a background down to a ~1% level. Numerous tests performed with a simplified pilot prototype DANSSino under a 3 GWth reactor of the Kalinin NPP have demonstrated operability of the chosen design. The DANSS detector surrounded with a composite shield is movable by means of a special lifting gear, varying the distance to the reactor core in a range from 10 m to 12 m. Due to this feature, it could be used not only for the reactor monitoring, but also for fundamental research including short-range neutrino oscillations to the sterile state. Supposing one-year measurement, the sensitivity to the oscillation parameters is expected to reach a level of sin2(2θnew) ~ 5 × 10−3 with Δ m2 ⊂ (0.02–5.0) eV2.

The high sensitivity double beta spectrometer TGV

Abstract A high sensitivity double beta spectrometer TGV (Telescope Germanium Vertical) has been developed. It is based on 16 HPGe detectors of volume 1200 × 6 mm3 each in the same cryostat. The TGV spectrometer was proposed for the study of ultrarare nuclear processes (e.g. 2νββ, 0νββ, 2νEC/EC). Details of the TGV spectrometer construction are described, the principles of background suppression, the results of Monte Carlo simulations and the results of test background measurements (in Dubna and Modane underground laboratory) are provided.

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 % MathType!MTEF!2!1!+-% feaafiart1ev1aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbuLwBLn% hiov2DGi1BTfMBaeXatLxBI9gBaerbd9wDYLwzYbItLDharqqtubsr% 4rNCHbGeaGqiVy0de9vqqrpepC0xbbL8F4rqqrFfpeea0xe9Lq-Jc9% vqaqpepm0xbba9pwe9Q8fs0-yqaqpepae9pg0FirpepeKkFr0xfr-x% fr-xb9adbaqaaeGaciGaaiaabeqaamaabaabaaGcbaGaamivamaaDa% aaleaadaWcgaqaaiaaigdaaeaacaaIYaaaaaqaaiaaikdacqaH9oGB% cqaHYoGydaahaaadbeqaaiabgUcaRaaaieaaliaa-veacaWFdbaaaa% aa!3EF4!

New search for double electron capture in

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Cd decay with the TGV-2 spectrometer

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