Partial OMC rates in 48 Ti and 76 Se for 2 β -decay.

1. PartialOMC rates in 48Ti and 76Se for 2β-decay. V. Egorov, A. Klinskih, M, Shirchenko, R. Vasiliev, D. Zinatulina 13 June 2007 Medex-07

2. Time-Energy distribution prompt delayed

4. Investigated spectra

5. Detector efficiency (relative) Small detector with Be window High-volume detector

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

7. n 2n A-1, Z-1 A-2, Z-1 OMC Target: A, Z A, Z-1 Scheme of the muon capture.

8. 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

9. <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

10. Partial rates for 48Sc (% per μ-stop) Normalized to this line which we cannot extract

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

12. 2n n aγ aγ OMC aγ aβ- aβ- Target: aβ- A, Z Decay of the nuclei produced in OMC.

13. 76As 75As 74As Uncorrelated spectrum measured with the 76Se target.

14. - Intensity of gamma line • The sum of μX-ray K-series. - Probability of the isotope formation. - Measurement time - Line branching - Decay rate. Calculation of isotope yields.

15. Isotope yield.

16. Plan for the nearest future • To publish the paper “μ-capture in 76Se”; • To check results for 48Ti and to extract partial rates for the rest 48Sc levels; • To continue analysis of μ-capture in 82Kr and 150Sm (level scheme of 150Pm is not known!); • To finish data handling for 106Cd.

17. Thank you!