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Next stage of a search for 2K(2  )-capture of 78 Kr

Next stage of a search for 2K(2  )-capture of 78 Kr. Valery V. Kuzminov Baksan Neutrino Observatory INR RAS. NON-ACCELERATOR NEW PHYSICS Dubna, Russia, June 20--25, 2005. Ju. Gavriljuk, V. Gavrin, A. Gangapshev, V. Kazalov, V. Kuzminov, N. Osetrova

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Next stage of a search for 2K(2  )-capture of 78 Kr

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  1. Next stage of a search for 2K(2)-capture of 78Kr Valery V. Kuzminov Baksan Neutrino Observatory INR RAS NON-ACCELERATOR NEW PHYSICS Dubna, Russia, June 20--25, 2005

  2. Ju. Gavriljuk, V. Gavrin, A. Gangapshev, V. Kazalov, V. Kuzminov, N. Osetrova Institute for Nuclear Research of the Russian Academy of Sciences, Moscow Russia A. Shubin, G. Skorynin, I. Pul`nikov, A.Ryabukhin FSUE PA “Electrochemical Plant”, Zeleznogorsk, Krasnoyarsk Region, Russia S. Panasenko, S. Ratkevich Karazin Kharkiv National University, Kharkiv, Ukraine The work is performing in the frames of a Presidium RAS Fundamental Research Program “Neutrino Physics” and Supported by RFBR grant №04-02-16037

  3. 2ek 1. +2(2.88 MeV) Theory: N2k=0.786Nee M. Doi … 1992y Experiment:

  4. assumption Se**----------------->Se*+ Se* Kab=12.652 keV, 2Kab=25.3 keV Ka1=11.221 keV 1.00 Ka2=11.181 keV 0.52 Kb1=12.491 keV 0.21 Kb2=12.651 keV 0.01 wk=0.596 x-ray we=0.404e-Auger 2.

  5. Schematic diagram of 2k-capture event 78Se**  78Se 78Se** 78Se

  6. Parameters of the counter Æ140 Æ150 Cross-section of the counter + - anode

  7. Low background shield 1760 mm   970 mm 15 cm lead 8 cm boratedpolyethylene 18 cm copper

  8. View of installation

  9. 78Kr – sumple 1. Old 78Kr – sumple, (48.64 l) 85Kr – activity 0.1Bk/l Preliminary measurements: Bkg. (20100 keV) = 3700 h-1 (V=9.16 l, p=4.55 at) 2. New 78Kr – sumple, (47.65 l) 85 Kr – activity 1.8· 10-3 Bk/l Preliminary measurements: Bkg. (20100 keV) = 67 h-1 (V=9.16 l, p=4.55 at) Bkg. = Bkg.own + Bkg.Kr-85 |  ?

  10. Electric scheme of the setup PA1 & PA2 – preamplifiersA1 & A2 – amplifiers CS–coincidence scheme DO– digital oscilloscope

  11. Real pulse sample

  12. Spectrum of 109Cd (88 keV) R=6% R=6.5% R=15.9% Energy, keV Energy, keV

  13. Background(T=159 h)

  14. Values of parameters for useful eventswith 3(•) ionizations

  15. Events in the region 25.3±2.5 keV (95% C.L.) • Effect = 0 Þ£2.44 (90% С.L.) • Probability (p): E1a; Eka; EkbÞ 0.213 • E2a; Eka; EkbÞ0.773 • 0.985

  16. Results: • Number of Kr-78 atoms - 1.08·1024 • Registration efficiency for 3(·)-events - 0.809 • Probability for 3(·)-events - 0.355

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