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MATRIX elements workshop, Dresden, Germany 30 . 07 . 10

OMC rates in different nuclei related to 2 β -decay. K.Ya. Gromov, D.R. Zinatulina , C. Briançon, V.G. Egorov , A.V. Klinskih, R.V. Vasiliev , M.V.Shirchenko , I. Yutlandov, C. Petitjean. MATRIX elements workshop, Dresden, Germany 30 . 07 . 10. OMC!. (n,p)-like charge- -exchange

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MATRIX elements workshop, Dresden, Germany 30 . 07 . 10

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  1. OMC rates in different nuclei related to 2β-decay. K.Ya. Gromov, D.R. Zinatulina, C. Briançon, V.G. Egorov, A.V. Klinskih, R.V. Vasiliev, M.V.Shirchenko,I. Yutlandov, C. Petitjean. MATRIX elements workshop, Dresden, Germany 30.07.10

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

  3. Ordinary MuonCapture (OMC) • Electron Capture: e- + (A,Z)  (A, Z-1) + e Q~ me  0.5 MeV • Muon Capture: - + (A,Z)  (A, Z-1) +  Q~ m  100 MeV

  4. OMC

  5. Candidates for 2β decay and status of μ-capture:

  6. Setup (solid target)

  7. PSI,2006

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

  9. PSI,2006

  10. Distribution of N (E, t):

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

  12. Muon life-time in Kr isotopes yield ns

  13. Our results for Kr and Sm:

  14. Distribution of N (E, t)

  15. What do we observe? • Prompt muonic X-rays (cascade) - Prompt spectrum give us: identification, normalization, and isotopic shifts. • Delayed γ-rays following μ-capture - Delayed spectrum give us: identification and partial rates • -(Background) -uncorrelated to muon capture- Uncorrelated spectrum give us: identification, calibration and isotopic yields.

  16. Spectra with Kr:

  17. 6 5 4 3 D 2 P 1 S K-series Muonic X -rays Normalization: Number of Incoming muons ~ ~ sum of KX-lines

  18. Isotopic shift in Cd: Ka1 (106Cd) Ka2(106Cd)

  19. OMC

  20. Detector efficiency: Small detector with Be window High-volume detector eff‘cy E[keV]

  21. Ii If - Intensity of gamma line incoming to level 252.35 keV 48Sc - Intensity of gamma line outgoing from level 252.35 keV • The sum of intensities mu-X-rays K-series. - Enrichment of our target. Extraction of partial rates 252.35

  22. <0.194 % <3 3301.9 <0.194 % <3 3216.1 1+ 3149.9 (0.24 ± 0.04) % 1+ 3056.5 <1.25% 3026.2 (1.10 ± 0.06) % 2,3 (0.35 ± 0.09) % 1+ 2980.8 1, 2, 3 2811.2 (0.40 ± 0.03) % 2783.3 2+ 1-, 2- 2670.3 (0.37 ± 0.04) % 1, 2- 2640.1 1+ 2517.3 (0.35 ± 0.08) % 2+ 2275.48 (0.47 ± 0.07) % 3+ 2190.46 < 0.0004 % (0.11 ± 0.05) % 3- 1891.06 2– 1401.69 < 1.55 % 2+ 1142.57 3+ 622.64 4+ 252.35 < 0.31 % 5+ 130.94 ~ 7.37% 6+ 0 48Sc

  23. Partial rates for 48Sc (% per μ-stop)

  24. Partial rates for 76As (% per μ-stop)

  25. 2n n aγ aγ OMC aγ aβ- aβ- Target: aβ- A, Z Decay of the nuclei produced in OMC

  26. 76As 75As 74As Uncorrelated spectrum measured with the 76Se target

  27. Isotopes yields for 150Sm:

  28. Conclusions and plans: • OMC presently  seems to be a bit off the main stream of physics But: it can provide important information about the high-q component of the weak nuclear response, i.e. it is relevant for the neutrinoless double beta decay (here in particular the 2- and 3+ states) Further: the connection between mucap and double beta decay has been fully worked out theoretically (Suhonen et al) • Several double beta decay nuclei (48Ti, 76Se, 82Kr, 106Ag, 150Sm) have been studied in mu-cap by our group and results are consistent with chargex and  also complementary to chargex • The analyses are difficult and require a strong concerted effort (level scheme of 150Pm is unknown, difficult spectrum of 82Kr with many lines which including different isotopes in this reaction) • New and forceful initiatives are needed to advance the field --  the initiative of Prof. Ejiri is very much appreciated!!

  29. Thank you for your attention!

  30. Conclusion • 1)           Mucap presently  seems to be a bit off the main stream of physics • 2)           But: it can provide important information about the high-q component of the weak nuclear response, i.e. it is relevant for the neutrinoless double beta decay (here in particular the 2- and 3+ states) • 3)           Further: the connection between mucap and double beta decay has been fully worked out theoretically (Suhonen et al) • 4)           several double beta decay nuclei (48-Ti, 76Se, 82Kr, 106Ag, 116Sn, 150Sm) have been studied in mucap by our group and results are consistent with chargex and  also complementary to chargex. • 5)           The analyses are difficult and require a strong concerted effort • 6)           New and forceful initiatives are needed to advance the field --  the initiative of Prof. Ejiri is very much appreciated!!   

  31. here are my thoughts about mu-capture1) mucap tells us what states respond to the weak interaction at high momentum transfer2) the information gives  us a way to connect these states to hadronic interaction and may be allow to find some common scaling between mucap and chargex3) strong interaction  processes in chargex are complicated and contain components which are not relevant for weka interaction -- may be mucap can tell us more about the selectivity of the excitation in chargex

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