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Your search keyword '"Boiko, R.S."' showing total 5 results
Start Over Author "Boiko, R.S." Topic double beta decay
5 results on '"Boiko, R.S."'

1. First search for 2$\varepsilon$ and $\varepsilon\beta^+$ processes in $^{168}$Yb

Author

Belli, P., Bernabei, R., Boiko, R.S., Cappella, F., Caracciolo, V., Cerulli, R., Danevich, F.A., Di Vacri, M.L., Incicchitti, A., Kropivyansky, B.N., Laubenstein, M., Nisi, S., Poda, D.V., Polischuk, O.G., Tretyak, V.I., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
ytterbium, electron: capture, 168Yb, 176Yb, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Double beta decay, Gran Sasso, (0neutrino), Purification of ytterbium, Low counting gamma spectrometry, efficiency, excited state, 176 Yb, germanium: detector, 168 Yb, Nuclear Experiment, experimental results, energy: low
Abstract

The double-electron capture and the electron capture with positron emission in $^{168}$Yb have been investigated for the first time at the STELLA facility of the Gran Sasso underground laboratory (Italy) measuring 371 g of highly purified ytterbium oxide placed on the end-cap of a 465 cm$^3$ ultra-low-background high purity Germanium detector (HPGe). No gamma associated to double beta processes in $^{168}$Yb have been observed after 2074 h of data taking. This has allowed setting the half-life limits on the level of $\lim T_{1/2}\sim$ $10^{14}-10^{18}$ yr at 90\% C.L. Particularly, a lower half-life limit on a possible resonant neutrinoless double-electron capture in $^{168}$Yb to the $(2)^-$ 1403.7 keV excited state of $^{168}$Er is set as $T_{1/2}\geq1.9\times 10^{18}$ yr at 90\% C.L. Half-life limits $T_{1/2}^{2\nu(0\nu)}\geq 4.5(4.3)\times10^{16}$ yr were set on the $2\nu(0\nu)2\beta^-$ decay of $^{176}$Yb to the $2^+$ 84.3 keV first excited level of $^{176}$Hf., Comment: 23 pages, 6 figures, 4 tables

Published
2019

2. First search for 2ε and εβ+ processes in 168Yb.

Author

Belli, P., Bernabei, R., Boiko, R.S., Cappella, F., Caracciolo, V., Cerulli, R., Danevich, F.A., di Vacri, M.L., Incicchitti, A., Kropivyansky, B.N., Laubenstein, M., Nisi, S., Poda, D.V., Polischuk, O.G., and Tretyak, V.I.

Subjects
*ELECTRON capture, *GERMANIUM detectors, *DOUBLE beta decay, *POSITRON emission, *YTTERBIUM
Abstract

The double-electron capture and the electron capture with positron emission in 168Yb have been investigated for the first time at the STELLA facility of the Gran Sasso underground laboratory (Italy) measuring 371 g of highly purified ytterbium oxide placed on the end-cap of a 465 cm3 ultra-low-background high purity Germanium detector (HPGe). No gamma associated to double beta processes in 168Yb have been observed after 2074 h of data taking. This has allowed setting the half-life limits on the level of lim ⁡ T 1 / 2 ∼ 10 14 – 10 18 yr at 90% C.L. Particularly, a lower half-life limit on a possible resonant neutrinoless double-electron capture in 168Yb to the (2) − 1403.7 keV excited state of 168Er is set as T 1 / 2 ≥ 1.9 × 10 18 yr at 90% C.L. Half-life limits T 1 / 2 2 ν (0 ν) ≥ 4.5 (4.3) × 10 16 yr were set on the 2 ν (0 ν) 2 β − decay of 176Yb to the 2 + 84.3 keV first excited level of 176Hf. [ABSTRACT FROM AUTHOR]

Published
2019
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3. Search for double beta decay of 136Ce and 138Ce with HPGe gamma detector.

Author

Belli, P., Bernabei, R., Boiko, R.S., Cappella, F., Cerulli, R., Danevich, F.A., Incicchitti, A., Kropivyansky, B.N., Laubenstein, M., Poda, D.V., Polischuk, O.G., and Tretyak, V.I.

Subjects
*DOUBLE beta decay, *CERIUM oxides, *GERMANIUM radiation detectors, *MAGNITUDE estimation, *BETA decay, *SEMICONDUCTOR counters
Abstract

Search for double β decay of 136 Ce and 138 Ce was realized with 732 g of deeply purified cerium oxide sample measured over 1900 h with the help of an ultra-low background HPGe γ detector with a volume of 465 cm 3 at the STELLA facility of the Gran Sasso National Laboratories of the INFN (Italy). New improved half-life limits on double beta processes in the cerium isotopes were set at the level of lim ⁡ T 1 / 2 ∼ 10 17 – 10 18 yr ; many of them are even two orders of magnitude larger than the best previous results. [ABSTRACT FROM AUTHOR]

Published
2014
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4. Development of enriched 106CdWO4 crystal scintillators to search for double β decay processes in 106Cd

Author

Belli, P., Bernabei, R., Boiko, R.S., Brudanin, V.B., Bukilic, N., Cerulli, R., Chernyak, D.M., Danevich, F.A., d’Angelo, S., Degoda, V.Ya., Dossovitskiy, A.E., Galashov, E.N., Hyzhnyi, Yu.A., Ildyakov, S.V., Incicchitti, A., Kobychev, V.V., Kolesnyk, O.S., Kovtun, G.P., Kudovbenko, V.M., and de Laeter, J.R.

Subjects
*CADMIUM tungstate crystals, *SCINTILLATION counters, *BETA decay, *CADMIUM isotopes, *MASS spectrometry, *INORGANIC synthesis, *CRYSTAL growth
Abstract

Abstract: A cadmium tungstate crystal scintillator enriched in 106Cd was developed for an experiment to search for double beta processes in 106Cd. With this aim samples of cadmium with natural isotopic composition and enriched in 106Cd were purified by vacuum distillation. Cadmium tungstate compounds were synthesized from solutions. The absolute isotopic composition of the enriched cadmium was accurately determined as 66.4% by thermal ionisation mass-spectrometry. A 106CdWO4 crystal boule was grown by the low-thermal-gradient Czochralski technique. The total irrecoverable loss of the enriched cadmium in all the stages of the crystal scintillator production does not exceed 2.3%. The produced 106CdWO4 crystal scintillator with mass of 216g exhibits good optical and scintillation properties. [Copyright &y& Elsevier]

Published
2010
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5. CdWO4 crystal scintillators from enriched isotopes for double beta decay experiments.

Author

Poda, D.V., Barabash, A.S., Belli, P., Bernabei, R., Boiko, R.S., Brudanin, V.B., Cappella, F., Caracciolo, V., Castellano, S., Cerulli, R., Chernyak, D.M., Danevich, F.A., d'Angelo, S., Degoda, V.Ya., Di Vacri, M.L., Dossovitskiy, A.E., Galashov, E.N., Incicchitti, A., Kobychev, V.V., and Konovalov, S.I.

Subjects
*CADMIUM tungstate crystals, *SCINTILLATORS, *DOUBLE beta decay, *NUCLEAR physics experiments, *CADMIUM isotopes, *RADIOACTIVE contamination, *RECRYSTALLIZATION (Metallurgy), *NUCLEAR counters
Abstract

Abstract: Cadmium tungstate crystal scintillators enriched in 106Cd and 116Cd were developed. The produced scintillators exhibit good optical and scintillation properties, and a low level of radioactive contamination. Experiments to search for double beta decay of 106Cd and 116Cd are in progress at the Gran Sasso National Laboratories of the INFN (Italy). Prospects to further improve the radiopurity of the detectors by recrystallization are discussed. [Copyright &y& Elsevier]

Published
2013
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