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24 results on '"Rukhadze, N. I."'

1. Improved limits on $\beta^+$EC and ECEC processes in $^{74}$Se

Author

Barabash, A. S., Brudanin, V. B., Klimenko, A. A., Konovalov, S. I., Rakhimov, A. V., Rukhadze, E. N., Rukhadze, N. I., Shitov, Yu. A., Stekl, I., Warot, G., and Umatov, V. I.

Subjects
Nuclear Experiment
Abstract

New limits on $\beta^+$EC and ECEC processes in $^{74}$Se have been obtained using a 600 cm$^3$ HPGe detector and an external source consisting of 1600 g of a natural selenium powder. For different $\beta^+$EC and ECEC transitions (to the ground and excited states) obtained limits are on the level $\sim (0.2-4.8)\times10^{19}$ yr at 90\% C.L. In particular, for the potentially resonant transition into the 1204.2 keV excited state of $^{74}$Ge a lower half-life limit of $1.1\times10^{19}$ yr at 90\% C.L. has been obtained. Possibility to increase the sensitivity of such measurements is discussed., Comment: 16 pages, 3 figures. arXiv admin note: text overlap with arXiv:hep-ex/0610046

Published
2020
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2. Final results on $^\textbf{82}$Se double beta decay to the ground state of $^\textbf{82}$Kr from the NEMO-3 experiment

Author

Collaboration, NEMO-3, Arnold, R., Augier, C., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Boursette, D., Brudanin, V., Busto, J., Caffrey, A. J., Calvez, S., Cascella, M., Cerna, C., Cesar, J. P., Chapon, A., Chauveau, E., Chopra, A., Dawson, L., Duchesneau, D., Durand, D., Egorov, V., Eurin, G., Evans, J. J., Fajt, L., Filosofov, D., Flack, R., Garrido, X., Gómez, H., Guillon, B., Guzowski, P., Hodák, R., Huber, A., Hubert, P., Hugon, C., Jullian, S., Klimenko, A., Kochetov, O., Konovalov, S. I., Kovalenko, V., Lalanne, D., Lang, K., Lemière, Y., Noblet, T. Le, Liptak, Z., Liu, X. R., Loaiza, P., Lutter, G., Macolino, C., Mamedov, F., Marquet, C., Mauger, F., Morgan, B., Mott, J., Nemchenok, I., Nomachi, M., Nova, F., Nowacki, F., Ohsumi, H., Pahlka, R. B., Patrick, C., Perrot, F., Piquemal, F., Povinec, P., Přidal, P., Ramachers, Y. A., Remoto, A., Reyss, J. L., Riddle, C. L., Rukhadze, E., Rukhadze, N. I., Saakyan, R., Salazar, R., Sarazin, X., Shitov, Yu., Simard, L., Šimkovic, F., Smetana, A., Smolek, K., Smolnikov, A., Söldner-Rembold, S., Soulé, B., Štekl, I., Suhonen, J., Sutton, C. S., Szklarz, G., Thomas, J., Timkin, V., Torre, S., Tretyak, Vl. I., Tretyak, V. I., Umatov, V. I., Vanushin, I., Vilela, C., Vorobel, V., Waters, D., Xie, F., and Žukauskas, A.

Subjects
High Energy Physics - Experiment, Nuclear Experiment
Abstract

Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ($2\nu\beta\beta$) half-life of $^{82}$Se as $T_{1/2}^{2\nu} = \left[ 9.39 \pm 0.17\,\left(\mbox{stat}\right) \pm 0.58\,\left(\mbox{syst}\right)\right] \times 10^{19}$ y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is $\left|M^{2\nu}\right| = 0.0498 \pm 0.0016$. In addition, a search for neutrinoless double beta decay ($0\nu\beta\beta$) using 0.93 kg of $^{82}$Se observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of $T_{1/2}^{0\nu} > 2.5 \times 10^{23} \,\mbox{y} \,(90\%\,\mbox{C.L.})$ for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of $\langle m_{\nu} \rangle < \left(1.2 - 3.0\right) \,\mbox{eV}$, where the range reflects $0\nu\beta\beta$ nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other $0\nu\beta\beta$ mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set., Comment: 14 pages, 10 figures

Published
2018

3. Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of $^{48}{\rm Ca}$ with the NEMO-3 detector

Author

Collaboration, NEMO-3, Arnold, R., Augier, C., Bakalyarov, A. M., Baker, J. D., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Brudanin, V., Busto, J., Caffrey, A. J., Calvez, S., Cascella, M., Cerna, C., Cesar, J. P., Chapon, A., Chauveau, E., Chopra, A., Duchesneau, D., Durand, D., Egorov, V., Eurin, G., Evans, J. J., Fajt, L., Filosofov, D., Flack, R., Garrido, X., Gómez, H., Guillon, B., Guzowski, P., Hodák, R., Huber, A., Hubert, P., Hugon, C., Jullian, S., Klimenko, A., Kochetov, O., Konovalov, S. I., Kovalenko, V., Lalanne, D., Lang, K., Lebedev, V. I., Lemière, Y., Noblet, T. Le, Liptak, Z., Liu, X. R., Loaiza, P., Lutter, G., Mamedov, F., Marquet, C., Mauger, F., Morgan, B., Mott, J., Nemchenok, I., Nomachi, M., Nova, F., Nowacki, F., Ohsumi, H., Pahlka, R. B., Perrot, F., Piquemal, F., Povinec, P., Přidal, P., Ramachers, Y. A., Remoto, A., Reyss, J. L., Richards, B., Riddle, C. L., Rukhadze, E., Rukhadze, N. I., Saakyan, R., Salazar, R., Sarazin, X., Shitov, Yu., Simard, L., Šimkovic, F., Smetana, A., Smolek, K., Smolnikov, A., Söldner-Rembold, S., Soulé, B., Štekl, I., Suhonen, J., Sutton, C. S., Szklarz, G., Thomas, J., Timkin, V., Torre, S., Tretyak, Vl. I., Tretyak, V. I., Umatov, V. I., Vanushin, I., Vilela, C., Vorobel, V., Waters, D., Zhukov, S. V., and Žukauskas, A.

Subjects
High Energy Physics - Experiment, Nuclear Experiment, Physics - Instrumentation and Detectors
Abstract

The NEMO-3 experiment at the Modane Underground Laboratory has investigated the double-$\beta$ decay of $^{48}{\rm Ca}$. Using $5.25$ yr of data recorded with a $6.99\,{\rm g}$ sample of $^{48}{\rm Ca}$, approximately $150$ double-$\beta$ decay candidate events have been selected with a signal-to-background ratio greater than $3$. The half-life for the two-neutrino double-$\beta$ decay of $^{48}{\rm Ca}$ has been measured to be $T^{2\nu}_{1/2}\,=\,[6.4\, ^{+0.7}_{-0.6}{\rm (stat.)} \, ^{+1.2}_{-0.9}{\rm (syst.)}] \times 10^{19}\,{\rm yr}$. A search for neutrinoless double-$\beta$ decay of $^{48}{\rm Ca}$ yields a null result and a corresponding lower limit on the half-life is found to be $T^{0\nu}_{1/2} > 2.0 \times 10^{22}\,{\rm yr}$ at $90\%$ confidence level, translating into an upper limit on the effective Majorana neutrino mass of $< m_{\beta\beta} > < 6.0 - 26$ ${\rm eV}$, with the range reflecting different nuclear matrix element calculations. Limits are also set on models involving Majoron emission and right-handed currents., Comment: 8 pages, 5 figures, 3 tables. Final journal version after peer review

Published
2016
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6. Final results on 82Se82Kr double beta decay to the ground state of 82Se82Kr from the NEMO-3 experiment

Author

Arnold, R., Augier, C., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Boursette, D., Brudanin, V., Busto, J., Caffrey, A. J., Calvez, S., Cascella, M., Cerna, C., Cesar, J. P., Chapon, A., Chauveau, E., Chopra, A., Dawson, L., Duchesneau, D., Durand, D., Egorov, V., Eurin, G., Evans, J. J., Fajt, L., Filosofov, D., Flack, R., Garrido, X., Gómez, H., Guillon, B., Guzowski, P., Hodák, R., Huber, A., Hubert, P., Hugon, C., Jullian, S., Klimenko, A., Kochetov, O., Konovalov, S. I., Kovalenko, V., Lalanne, D., Lang, K., Lemière, Y., Le Noblet, T., Liptak, Z., Liu, X. R., Loaiza, P., Lutter, G., Macolino, C., Mamedov, F., Marquet, C., Mauger, F., Morgan, B., Mott, J., Nemchenok, I., Nomachi, M., Nova, F., Nowacki, F., Ohsumi, H., Pahlka, R. B., Patrick, C., Perrot, F., Piquemal, F., Povinec, P., Přidal, P., Ramachers, Y. A., Remoto, A., Reyss, J. L., Riddle, C. L., Rukhadze, E., Rukhadze, N. I., Saakyan, R., Salazar, R., Sarazin, X., Shitov, Yu., Simard, L., Šimkovic, F., Smetana, A., Smolek, K., Smolnikov, A., Söldner-Rembold, S., Soulé, B., Štekl, I., Suhonen, J., Sutton, C. S., Szklarz, G., Thomas, J., Timkin, V., Torre, S., Tretyak, Vl. I., Tretyak, V. I., Umatov, V. I., Vanushin, I., Vilela, C., Vorobel, V., Waters, D., Xie, F., and Žukauskas, A.

Published
2018
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9. Final results on $^\textbf{82}$Se double beta decay to the ground state of $^\textbf{82}$Kr from the NEMO-3 experiment

Author

3 Collaboration, Arnold, R., Augier, C., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Boursette, D., Brudanin, V., Busto, J., Caffrey, A. J., Calvez, S., Cascella, M., Cerna, C., Cesar, J. P., Chapon, A., Chauveau, E., Chopra, A., Dawson, L., Duchesneau, D., Durand, D., Egorov, V., Eurin, G., Evans, J. J., Fajt, L., Filosofov, D., Flack, R., Garrido, X., G��mez, H., Guillon, B., Guzowski, P., Hod��k, R., Huber, A., Hubert, P., Hugon, C., Jullian, S., Klimenko, A., Kochetov, O., Konovalov, S. I., Kovalenko, V., Lalanne, D., Lang, K., Lemi��re, Y., Noblet, T. Le, Liptak, Z., Liu, X. R., Loaiza, P., Lutter, G., Macolino, C., Mamedov, F., Marquet, C., Mauger, F., Morgan, B., Mott, J., Nemchenok, I., Nomachi, M., Nova, F., Nowacki, F., Ohsumi, H., Pahlka, R. B., Patrick, C., Perrot, F., Piquemal, F., Povinec, P., P��idal, P., Ramachers, Y. A., Remoto, A., Reyss, J. L., Riddle, C. L., Rukhadze, E., Rukhadze, N. I., Saakyan, R., Salazar, R., Sarazin, X., Shitov, Yu., Simard, L., ��imkovic, F., Smetana, A., Smolek, K., Smolnikov, A., S��ldner-Rembold, S., Soul��, B., ��tekl, I., Suhonen, J., Sutton, C. S., Szklarz, G., Thomas, J., Timkin, V., Torre, S., Tretyak, Vl. I., Tretyak, V. I., Umatov, V. I., Vanushin, I., Vilela, C., Vorobel, V., Waters, D., Xie, F., and ��ukauskas, A.

Subjects
High Energy Physics - Experiment (hep-ex), FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, High Energy Physics - Experiment
Abstract

Using data from the NEMO-3 experiment, we have measured the two-neutrino double beta decay ($2\nu\beta\beta$) half-life of $^{82}$Se as $T_{1/2}^{2\nu} = \left[ 9.39 \pm 0.17\,\left(\mbox{stat}\right) \pm 0.58\,\left(\mbox{syst}\right)\right] \times 10^{19}$ y under the single-state dominance hypothesis for this nuclear transition. The corresponding nuclear matrix element is $\left|M^{2\nu}\right| = 0.0498 \pm 0.0016$. In addition, a search for neutrinoless double beta decay ($0\nu\beta\beta$) using 0.93 kg of $^{82}$Se observed for a total of 5.25 y has been conducted and no evidence for a signal has been found. The resulting half-life limit of $T_{1/2}^{0\nu} > 2.5 \times 10^{23} \,\mbox{y} \,(90\%\,\mbox{C.L.})$ for the light neutrino exchange mechanism leads to a constraint on the effective Majorana neutrino mass of $\langle m_{\nu} \rangle < \left(1.2 - 3.0\right) \,\mbox{eV}$, where the range reflects $0\nu\beta\beta$ nuclear matrix element values from different calculations. Furthermore, constraints on lepton number violating parameters for other $0\nu\beta\beta$ mechanisms, such as right-handed currents, majoron emission and R-parity violating supersymmetry modes have been set., Comment: 14 pages, 10 figures

Published
2018

10. Development of methods for the preparation of radiopure 82Se sources for the SuperNEMO neutrinoless double-beta decay experiment

Author

Rakhimov, Alimardon V., primary, Barabash, A. S., additional, Basharina-Freshville, A., additional, Blot, S., additional, Bongrand, M., additional, Bourgeois, Ch., additional, Breton, D., additional, Breier, R., additional, Birdsall, E., additional, Brudanin, V. B., additional, Burešova, H., additional, Busto, J., additional, Calvez, S., additional, Cascella, M., additional, Cerna, C., additional, Cesar, J. P., additional, Chauveau, E., additional, Chopra, A., additional, Claverie, G., additional, De Capua, S., additional, Delalee, F., additional, Duchesneau, D., additional, Egorov, V. G., additional, Eurin, G., additional, Evans, J. J., additional, Fajt, L., additional, Filosofov, D. V., additional, Flack, R., additional, Garrido, X., additional, Gomez, H., additional, Guillon, B., additional, Guzowski, P., additional, Hodák, R., additional, Holý, K., additional, Huber, A., additional, Hugon, C., additional, Jeremie, A., additional, Jullian, S., additional, Karaivanov, D. V., additional, Kauer, M., additional, Klimenko, A. A., additional, Kochetov, O. I., additional, Konovalov, S. I., additional, Kovalenko, V., additional, Lang, K., additional, Lemière, Y., additional, Le Noblet, T., additional, Liptak, Z., additional, Liu, X. R., additional, Loaiza, P., additional, Lutter, G., additional, Maalmi, J., additional, Macko, M., additional, Mamedov, F., additional, Marquet, C., additional, Mauger, F., additional, Minotti, A., additional, Mirsagatova, A. A., additional, Mirzayev, N. A., additional, Moreau, I., additional, Morgan, B., additional, Mott, J., additional, Nemchenok, I. B., additional, Nomachi, M., additional, Nova, F., additional, Ohsumi, H., additional, Oliviero, G., additional, Pahlka, R. B., additional, Pater, J. R., additional, Palušová, V., additional, Perrot, F., additional, Piquemal, F., additional, Povinec, P., additional, Pridal, P., additional, Ramachers, Y. A., additional, Rebii, A., additional, Remoto, A., additional, Richards, B., additional, Ricol, J. S., additional, Rukhadze, E., additional, Rukhadze, N. I., additional, Saakyan, R., additional, Sadikov, I. I., additional, Salazar, R., additional, Sarazin, X., additional, Sedgbeer, J., additional, Shitov, Yu. A., additional, Šimkovic, F., additional, Simard, L., additional, Smetana, A., additional, Smolek, K., additional, Smolnikov, A. A., additional, Snow, S., additional, Söldner-Rembold, S., additional, Soulé, B., additional, Špavorova, M., additional, Štekl, I., additional, Tashimova, F. A., additional, Thomas, J., additional, Timkin, V., additional, Torre, S., additional, Tretyak, Vl. I., additional, Tretyak, V. I., additional, Umatov, V. I., additional, Vilela, C., additional, Vorobel, V., additional, Warot, G., additional, Waters, D., additional, Zampaolo, M., additional, and Žukauskas, A., additional

Published
2019
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11. Investigation of β+EC, EC/EC processes in 74Se

Author

Rukhadze, N. I., primary, Barabash, A. S., additional, Brudanin, V. B., additional, Klimenko, A. A., additional, Konovalov, S. I., additional, Rakhimov, A. V., additional, Rukhadze, E. N., additional, Shitov, Yu. A., additional, Stekl, I., additional, Umatov, V. I., additional, and Warot, G., additional

Published
2019
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12. Searching for the β+EC and EC/EC Decays of 74Se.

Author

Rukhadze, N. I., Barabash, A. S., Brudanin, V. B., Klimenko, A. A., Konovalov, S. I., Rakhimov, A. V., Rukhadze, E. N., Shitov, Yu. A., Stekl, I., Umatov, V. I., and Warot, G.

Abstract

Double beta decay (β+EC, EC/EC) of 74Se was investigated at the Modane underground laboratory (LSM, France; 4800 m of water equivalent) using the OBELIX ultralow-background HPGe detector with a sensitive volume of 600 cm3 and a sample of natural selenium with a mass of 1.6 kg containing ~0.89% (~14.24 g) of 74Se. The new experimental limits for β+EC and EC/EC decays of 74Se to ground 0+ and excited 596 keV, and 1204 keV states of 74Ge, were obtained from experimental data accumulated over 135 days. [ABSTRACT FROM AUTHOR]

Published
2020
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13. Final results on $${}^\mathbf{82 }{\hbox {Se}}$$ double beta decay to the ground state of $${}^\mathbf{82 }{\hbox {Kr}}$$ from the NEMO-3 experiment

Author

Arnold, R., primary, Augier, C., additional, Barabash, A. S., additional, Basharina-Freshville, A., additional, Blondel, S., additional, Blot, S., additional, Bongrand, M., additional, Boursette, D., additional, Brudanin, V., additional, Busto, J., additional, Caffrey, A. J., additional, Calvez, S., additional, Cascella, M., additional, Cerna, C., additional, Cesar, J. P., additional, Chapon, A., additional, Chauveau, E., additional, Chopra, A., additional, Dawson, L., additional, Duchesneau, D., additional, Durand, D., additional, Egorov, V., additional, Eurin, G., additional, Evans, J. J., additional, Fajt, L., additional, Filosofov, D., additional, Flack, R., additional, Garrido, X., additional, Gómez, H., additional, Guillon, B., additional, Guzowski, P., additional, Hodák, R., additional, Huber, A., additional, Hubert, P., additional, Hugon, C., additional, Jullian, S., additional, Klimenko, A., additional, Kochetov, O., additional, Konovalov, S. I., additional, Kovalenko, V., additional, Lalanne, D., additional, Lang, K., additional, Lemière, Y., additional, Le Noblet, T., additional, Liptak, Z., additional, Liu, X. R., additional, Loaiza, P., additional, Lutter, G., additional, Macolino, C., additional, Mamedov, F., additional, Marquet, C., additional, Mauger, F., additional, Morgan, B., additional, Mott, J., additional, Nemchenok, I., additional, Nomachi, M., additional, Nova, F., additional, Nowacki, F., additional, Ohsumi, H., additional, Pahlka, R. B., additional, Patrick, C., additional, Perrot, F., additional, Piquemal, F., additional, Povinec, P., additional, Přidal, P., additional, Ramachers, Y. A., additional, Remoto, A., additional, Reyss, J. L., additional, Riddle, C. L., additional, Rukhadze, E., additional, Rukhadze, N. I., additional, Saakyan, R., additional, Salazar, R., additional, Sarazin, X., additional, Shitov, Yu., additional, Simard, L., additional, Šimkovic, F., additional, Smetana, A., additional, Smolek, K., additional, Smolnikov, A., additional, Söldner-Rembold, S., additional, Soulé, B., additional, Štekl, I., additional, Suhonen, J., additional, Sutton, C. S., additional, Szklarz, G., additional, Thomas, J., additional, Timkin, V., additional, Torre, S., additional, Tretyak, Vl. I., additional, Tretyak, V. I., additional, Umatov, V. I., additional, Vanushin, I., additional, Vilela, C., additional, Vorobel, V., additional, Waters, D., additional, Xie, F., additional, and Žukauskas, A., additional

Published
2018
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14. Investigation of β+EC, EC/EC Processes in 74Se.

Author

Rukhadze, N. I., Barabash, A. S., Brudanin, V. B., Klimenko, A. A., Konovalov, S. I., Rakhimov, A. V., Rukhadze, E. N., Shitov, Yu. A., Stekl, I., Umatov, V. I., and Warot, G.

Subjects
*DOUBLE beta decay, *SELENIUM, *GERMANIUM radiation detectors
Abstract

Investigation of double beta decay processes (β+EC, EC/EC) of 74Se was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using ultra low-background HPGe detector Obelix with sensitive volume of 600 cm³ and a sample of natural selenium with a mass of 1.6 kg, containing ∼0.89% (∼14.24 g) of 74Se. New experimental limits (at 90 % CL) on double beta decay transitions of 74Se to the ground and exited states of 74Ge were obtained from the preliminary calculation of experimental data accumulated in 135 days. [ABSTRACT FROM AUTHOR]

Published
2019
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15. Measurement of the double-beta decay half-life and search for the neutrinoless double-beta decay of Ca48 with the NEMO-3 detector

Author

Arnold, R., Augier, C., Bakalyarov, A. M., Baker, J. D., Barabash, A. S., Basharina-Freshville, A., Blondel, S., Blot, S., Bongrand, M., Brudanin, V., Busto, J., Caffrey, A. J., Calvez, S., Cascella, M., Cerna, C., Cesar, J. P., Chapon, A., Chauveau, E., Chopra, A., Duchesneau, D., Durand, D., Egorov, V., Eurin, G., Evans, J. J., Fajt, L., Filosofov, D., Flack, R., Garrido, X., Gómez, H., Guillon, B., Guzowski, P., Hodák, R., Huber, A., Hubert, P., Hugon, C., Jullian, S., Klimenko, A., Kochetov, O., Konovalov, S. I., Kovalenko, V., Lalanne, D., Lang, K., Lebedev, V. I., Lemière, Y., Le Noblet, T., Liptak, Z., Liu, X. R., Loaiza, P., Lutter, G., Mamedov, F., Marquet, C., Mauger, F., Morgan, B. (Ben), Mott, J., Nemchenok, I., Nomachi, M., Nova, F., Nowacki, F., Ohsumi, H., Pahlka, R. B., Perrot, F., Piquemal, F., Povinec, P., Přidal, P., Ramachers, Y., Remoto, A., Reyss, J. L., Richards, B., Riddle, C. L., Rukhadze, E., Rukhadze, N. I., Saakyan, R., Salazar, R., Sarazin, X., Shitov, Yu., Simard, L., Šimkovic, F., Smetana, A., Smolek, K., Smolnikov, A., Söldner-Rembold, S., Soulé, B., Štekl, I., Suhonen, J., Sutton, C. S., Szklarz, G., Thomas, J., Timkin, V., Torre, S., Tretyak, Vl. I., Tretyak, V. I., Umatov, V. I., Vanushin, I., Vilela, C., Vorobel, V., Waters, D., Zhukov, S. V., Žukauskas, A., and HASH(0x5651ca2a1718)

Subjects
QC
Abstract

The NEMO-3 experiment at the Modane Underground Laboratory investigates the double-beta decay of 48Ca. Using 5.25 yr of data recorded with a 6.99 g sample of 48 Ca, approximately 150 double-beta decay candidate events are selected with a signal-to-background ratio greater than 3. The half-life for the two-neutrino double-beta decay of 48Ca is measured to be T2ν1/2=[6.4+0.7−0.6(stat)+1.2 −0.9(syst)]×1019 yr. A search for neutrinoless double-beta decay of 48Ca yields a null result, and a corresponding lower limit on the half-life is found to be T0ν1/2 >2.0×1022 yr at 90% confidence level, translating into an upper limit on the effective Majorana neutrino mass of ⟨mββ⟩

Published
2016

17. Development of methods for the preparation of radiopure 82Se sources for the SuperNEMO neutrinoless double-beta decay experiment

Author

Rakhimov, Alimardon V., Barabash, A. S., Basharina-Freshville, A., Blot, S., Bongrand, M., Bourgeois, Ch., Breton, D., Breier, R., Birdsall, E., Brudanin, V. B., Burešova, H., Busto, J., Calvez, S., Cascella, M., Cerna, C., Cesar, J. P., Chauveau, E., Chopra, A., Claverie, G., De Capua, S., Delalee, F., Duchesneau, D., Egorov, V. G., Eurin, G., Evans, J. J., Fajt, L., Filosofov, D. V., Flack, R., Garrido, X., Gomez, H., Guillon, B., Guzowski, P., Hodák, R., Holý, K., Huber, A., Hugon, C., Jeremie, A., Jullian, S., Karaivanov, D. V., Kauer, M., Klimenko, A. A., Kochetov, O. I., Konovalov, S. I., Kovalenko, V., Lang, K., Lemière, Y., Le Noblet, T., Liptak, Z., Liu, X. R., Loaiza, P., Lutter, G., Maalmi, J., Macko, M., Mamedov, F., Marquet, C., Mauger, F., Minotti, A., Mirsagatova, A. A., Mirzayev, N. A., Moreau, I., Morgan, B., Mott, J., Nemchenok, I. B., Nomachi, M., Nova, F., Ohsumi, H., Oliviero, G., Pahlka, R. B., Pater, J. R., Palušová, V., Perrot, F., Piquemal, F., Povinec, P., Pridal, P., Ramachers, Y. A., Rebii, A., Remoto, A., Richards, B., Ricol, J. S., Rukhadze, E., Rukhadze, N. I., Saakyan, R., Sadikov, I. I., Salazar, R., Sarazin, X., Sedgbeer, J., Shitov, Yu. A., Šimkovic, F., Simard, L., Smetana, A., Smolek, K., Smolnikov, A. A., Snow, S., Söldner-Rembold, S., Soulé, B., Špavorova, M., Štekl, I., Tashimova, F. A., Thomas, J., Timkin, V., Torre, S., Tretyak, Vl. I., Tretyak, V. I., Umatov, V. I., Vilela, C., Vorobel, V., Warot, G., Waters, D., Zampaolo, M., and Žukauskas, A.

Abstract

A radiochemical method for producing 82Se sources with an ultra-low level of contamination of natural radionuclides (40K, decay products of 232Th and 238U) has been developed based on cation-exchange chromatographic purification with reverse removal of impurities. It includes chromatographic separation (purification), reduction, conditioning (which includes decantation, centrifugation, washing, grinding, and drying), and 82Se foil production. The conditioning stage, during which highly dispersed elemental selenium is obtained by the reduction of purified selenious acid (H2SeO3) with sulfur dioxide (SO2) represents the crucial step in the preparation of radiopure 82Se samples. The natural selenium (600 g) was first produced in this procedure in order to refine the method. The technique developed was then used to produce 2.5 kg of radiopure enriched selenium (82Se). The produced 82Se samples were wrapped in polyethylene (12 μm thick) and radionuclides present in the sample were analyzed with the BiPo-3 detector. The radiopurity of the plastic materials (chromatographic column material and polypropylene chemical vessels), which were used at all stages, was determined by instrumental neutron activation analysis. The radiopurity of the 82Se foils was checked by measurements with the BiPo-3 spectrometer, which confirmed the high purity of the final product. The measured contamination level for 208Tl was 8–54 μBq/kg, and for 214Bi the detection limit of 600 μBq/kg has been reached.

Published
2020
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18. Search for double beta decay of106Cd in the TGV-2 experiment

Author

Rukhadze, N I, primary, Brudanin, V B, additional, Egorov, V G, additional, Klimenko, A A, additional, Kovalik, A, additional, Kouba, P, additional, Piquemal, F, additional, Rozov, S V, additional, Rukhadze, E, additional, Salamatin, A V, additional, Šimkovic, F, additional, Shitov, Yu A, additional, Štekl, I, additional, Timkin, V V, additional, and Yakushev, E A, additional

Published
2016
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19. Investigation of Double Beta Decay of 58Ni with the Obelix Spectrometer.

Author

Brudanin, V. B., Klimenko, A. A., Piquemal, F., Rukhadze, E., Rukhadze, N. I., Shitov, Yu. A., Stekl, I., and Warot, G.

Subjects
DOUBLE beta decay, NEUTRINOS, NUCLEAR matrix, NUCLEAR reactions, EXCITED states
Abstract

Investigation of double beta decay processes (β+EC, EC/EC) of 58Ni was performed at the Modane underground laboratory (LSM, France, 4800 m w.e.) using ultra low-background HPGe detector Obelix with sensitive volume of 600 cm3 and a sample of natural nickel, containing ∼68% of 58Ni with a mass of ∼21.7 kg. New experimental limits on 2νβ+EC decay of 58Ni to the ground 0+ and 2+1 , 811 keV excited state of 58Fe, and 2νEC/EC decay of 58Ni to 2+1 , 811 keV and 2+2 , 1 675 keV excited states of 58Fe were obtained from the preliminary calculation of experimental data accumulated in ∼88d. They are - T1/2(β+EC, 0+ → 0+) > 1.4 ×1021 y; T1/2 (β+EC, 0+ → 2+1 ) > 1.7 ×1022 y, T1/2 (EC/EC, 0+ → 2+1 ) > 2.4 ×1022 y, T1/2 (EC/EC,0+ → 2+2 ) > 2.1 × 1022 y. For resonant neutrino-less radiative EC/EC decay with energy of 1 918.3 keV a new experimental limit of T1/2 (0νEC/EC − res, 1918keV) > 4.7 ×1022 y was also obtained. All limits are at 90 % CL. [ABSTRACT FROM AUTHOR]

Published
2017
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20. Investigating the Double Beta Decay of 58Ni.

Author

Rukhadze, N. I., Brudanin, V. B., Klimenko, A. A., Piquemal, F., Rukhadze, E. N., Shitov, Yu. A., Štekl, I., and Warot, G.

Abstract

Double beta decay (β + EC, EC/EC) of 58Ni is investigated at France’s Modane Underground Laboratory (4800 m water equivalent) using the OBELIX ultralow-background HPGe detector with a sensitive volume of 600 cm3 and a natural nickel sample of ~68% 58Ni with a mass of ~21.7 kg. After preliminary analysis of the experimental data accumulated over ~144 days, new experimental limits are obtained for the 2νβ+EC decay of 58Ni to the 0+ ground state and the 21+, 811 keV excited state of 58Fe, and for the 2νEC/EC decay of 58Ni to the 21+, 811 keV and 22+, 1675 keV excited states of 58Fe. The limits are T1/2(β+EC,0→0+) > 1.7 × 1022 yr, T1/2(β+EC,0→21+) > 2.3 × 1022 yr, T1/2(EC/EC,0→21+) > 3.3 × 1022 yr, and T1/2(EC/EC,0→22+) > 3.4 × 1022 yr. Experimental limit T1/2(0νEC/EC-res, 1918 keV > 4.1 × 1022 yr is obtained for resonant neutrinoless radiative EC/EC decay with an energy of 1918.3 keV. All limits are at 90% CL. [ABSTRACT FROM AUTHOR]

Published
2018
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21. Double electron capture of 106Cd in the TGV-2 experiment

Author

Rukhadze, N. I., primary, Briancon, Ch., additional, Brudanin, V. B., additional, Egorov, V. G., additional, Fajt, L., additional, Hodák, R., additional, Klimenko, A. A., additional, Kovalik, A., additional, Kouba, P., additional, Piquemal, F., additional, Rozov, S. V., additional, Rukhadze, E., additional, Rychnovský, F., additional, Salamatin, A. V., additional, Šimkovic, F., additional, Shitov, Yu. A., additional, Štekl, I., additional, Timkin, V. V., additional, and Yakushev, E. A., additional

Published
2015
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23. Double electron capture of 106Cd in the TGV-2 experiment.

Author

Rukhadze, N. I., Briancon, Ch., Brudanin, V. B., Egorov, V. G., Fajt, L., Hodák, R., Klimenko, A. A., Kovalik, A., Kouba, P., Piquemal, F., Rozov, S. V., Rukhadze, E., Rychnovský, F., Salamatin, A. V., Šimkovic, F., Shitov, Yu. A., Štekl, I., Timkin, V. V., and Yakushev, E. A.

Subjects
*NUCLEAR electron capture, *RESONANCE neutrons, *NEUTRINOLESS double beta decay, *GERMANIUM radiation detectors, *SPECTROMETERS, *NUCLEAR physics
Abstract

A new experimental run of searching for EC/EC decay of 106Cd was performed at the Modane underground laboratory (4800 m w.e.) using the TGV-2 spectrometer and ~23.2 g 106Cd with enrichment of 99.57%. The limit on 2νEC/EC decay of 106Cd - T1/2(2νEC/EC) > 3.1×1020 y, at 90% C.L was obtained from the preliminary calculation of experimental data accumulated for 7018 h of measurement. The limits on the resonance neutrino-less double electron capture decay of 106Cd were obtained from the measurement of ~23.2 g of 106Cd with the low-background HPGe spectrometer OBELIX lasted 395 h - T1/2(KL, 2741 keV) > 0.9×1020 y and T1/2(KK, 2718 keV) > 1.4×1020 y at 90% C.L. [ABSTRACT FROM AUTHOR]

Published
2015
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24. Si pixel detectors in the detection of EC/EC decay.

Author

Jose, J. M., Čermák, P., Fajt, L., Loaiza, P., Rukhadze, N. I., Shitov, Yu. A., and Štekl, I.

Subjects
SILICON, PIXELS, NUCLEAR counters, ELECTRON capture, PHYSICS experiments, PROTOTYPES
Abstract

The SPT collaboration has been investigating the applicability of pixel detectors in the detection of two neutrino double electron capture (2νEC/EC) in 106Cd. The collaboration has proposed a Silicon Pixel Telescope (SPT) where a pair of Si pixel detectors with enriched Cd foil in the middle forms the detection unit. The Pixel detector gives spatial information along with energy of the particle, thus helps to identify and remove the background signals. Four units of SPT prototype (using 0.5 and 1 mm Si sensors) were fabricated and installed in the LSM underground laboratory, France. Recent progress in the SPT experiment and preliminary results from background measurements are presented. [ABSTRACT FROM AUTHOR]

Published
2015
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