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OMC rates in Sm and Kr for 2 b -decay

OMC rates in Sm and Kr for 2 b -decay. V.G. Egorov , A.V. Klinskih, R.V. Vasiliev , M.V.Shirchenko , D.R. Zinatulina 13 .0 6.200 7 MEDEX’07. OMC!. (n,p)-like charge- -exchange reactions. ?. . PSI 2006 :. 150 Sm 2 O 3 (solid target) nat Sm 2 O 3 (solid target)

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OMC rates in Sm and Kr for 2 b -decay

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  1. OMC rates in Sm and Kr for 2b-decay V.G. Egorov, A.V. Klinskih, R.V. Vasiliev, M.V.Shirchenko, D.R. Zinatulina 13.06.2007 MEDEX’07

  2. OMC! (n,p)-like charge- -exchange reactions ? 

  3. PSI 2006: • 150Sm2O3(solid target) • natSm2O3(solid target) • natKr (gas target) • 82Kr (gas target) • 12C4H10(gas target) • 232Th (calibration purpose) • 197Au (calibration purpose)

  4. Setup (solid target)

  5. Try to find a physicist! PSI,2006 An answer

  6. To deal with enriched 82Kr: • Keep noble gas (expensive! penetrating!) without loosing • Ensure μ-stops in gas (⇒ thickness of the entrance window be comparable with the “thickness” of gas) • Ensure detection of low-energy γ-rays without absorption in the target walls • ⇒Special construction was developed.

  7. Setup (gas target) Entrance window  C1 & C2 Vessel walls   plastic scintillator C3

  8. Gas vessel (C3) covered with black paper PSI,2006 PMT(C3) Gas inlet PMT(C1) Beam entrance PMC(C2)

  9. PSI,2006 physicist

  10. What do we observe?: • (Background) radiation not connected directly to muons (uncorrelated spectrum) • Cascade of muonic X-rays (prompt spectrum) • Nuclear g-rays following m-capture (delayed spectrum)

  11. Time [ns] Energy [keV]

  12. Spectra with 82Kr target

  13. Time evolution (method) The fragment number (each fragment corresponds to 10 ns time period)

  14. Muon life-time in Kr isotopes

  15. Our results for Kr and Sm:

  16. Dependence of λcapt.on(Z,A): • Total capture rate reflects the collective properties of the nucleus • Primakoff’s rule : λc=(Zeff)4 ∙ X1 · {1 - X2∙(A-Z)/2A} X1 = 120..170 X2 ≈ 3.0

  17. Effective Z-values and Huff factors taken from NP 35(1962)295

  18. Primakoff’s rule for different isotopes:

  19. Conclusions: • Some of our results contradict to theory Wrong measurement? Wrong interpretation? Wrong Primakoff rule? Wrong Zeff? • What can we do with this? Any ideas? • In any case, our L-values are necessary (and really are used) in extraction of partial capture rates – next talk.

  20. Thanks for your attention!

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