1. Teresa Kurtukian-Nieto Centre d’Etudes Nucléaires de Bordeaux Gradignan Precision half-life determination of the superallowed 0 + → 0 + β + -emmiters 42 Ti, 38 Ca, 30 S and the mirror β transitions of 39 Ca, 31 S and 29 P Workshop of ESNT: Isospin symmetry and its breaking in nuclear structure CEA/SPhN-Saclay, April 29th 2011

2. Teresa Kurtukian Nieto, CENBG April 29th 2011 2 CEA/SPhN Workshop of the ESNT Experimental ft measurements T 1/2 Q EC BR 0+0+ 0+0+ Precision measurements required: Q EC → mass measurements: f ~ Q 5 T 1/2, BR →  -decay studies: t = T1/2 / BR to test Ft value  required relative precision ~10 -3 Mirror Transitions T=1/2 Super Allowed Fermi 0+ → 0+

3. Teresa Kurtukian Nieto, CENBG April 29th 2011 3 CEA/SPhN Workshop of the ESNT typical setup: - beam purification system: traps - beta detector - gamma detectors Half-life measurements: Experimental details  JYFL – IGISOL  ISOLDE / CERN  JYFL – IGISOL  ISOLDE / CERN

4. Teresa Kurtukian Nieto, CENBG April 29th 2011 4 CEA/SPhN Workshop of the ESNT JYFLTRAP  detector Ge detectors Tape transport system Typical setup: JYFL – IGISOL

5. Teresa Kurtukian Nieto, CENBG April 29th 2011 5 CEA/SPhN Workshop of the ESNT detection setup -  plastic scintillator -  germanium tape transport system Typical setup: JYFL – IGISOL

6. Teresa Kurtukian Nieto, CENBG April 29th 2011 6 CEA/SPhN Workshop of the ESNT Typical setup: ISOLDE / CERN radioactive ions detection -  gas counter -  germanium GSI tape system

7. Teresa Kurtukian Nieto, CENBG April 29th 2011 7 CEA/SPhN Workshop of the ESNT Half-life measurements: Experimental details measurement principle cycles - isotope accumulation - purification - transport -decay measurement -remaining activity evacuation measurement principle cycles - isotope accumulation - purification - transport -decay measurement -remaining activity evacuation different fixed dead times: 2  s, 8  s, 100  s different detector high-voltages different detection thresholds

8. Teresa Kurtukian Nieto, CENBG April 29th 2011 8 CEA/SPhN Workshop of the ESNT Data analysis: cycle selection: no beam, detector sparking… half-life cuts: test of dead time correction half-life as a function of background, of rate, of detector settings  Is there any dependence of the half-life of these parameters?  error budget Half-life measurements: Experimental details

9. Super Allowed Fermi 0+ → 0+

10. Teresa Kurtukian Nieto, CENBG April 29th 2011 10 CEA/SPhN Workshop of the ESNT all nuclei of interest Experimental quantities: Q values: traps, high precision “easily” reachable half-lives: feasible branching ratios: hard part… Error budget

11. Super Allowed Fermi 0+ → 0+: 42 Ti

12. Teresa Kurtukian Nieto, CENBG April 29th 2011 12 CEA/SPhN Workshop of the ESNT Beam purification: JYFLTRAP

13. Teresa Kurtukian Nieto, CENBG April 29th 2011 13 CEA/SPhN Workshop of the ESNT Typical spectrum: one run

14. Teresa Kurtukian Nieto, CENBG April 29th 2011 14 CEA/SPhN Workshop of the ESNT Implantation on the tape?

15. Teresa Kurtukian Nieto, CENBG April 29th 2011 15 CEA/SPhN Workshop of the ESNT 2s2s 8s8s 100  s Dead time correction: part 1

16. Teresa Kurtukian Nieto, CENBG April 29th 2011 16 CEA/SPhN Workshop of the ESNT  test of dead time correction Dead time correction: part 2

17. Teresa Kurtukian Nieto, CENBG April 29th 2011 17 CEA/SPhN Workshop of the ESNT Different experimental conditions: thresholds and high-voltages

18. Teresa Kurtukian Nieto, CENBG April 29th 2011 18 CEA/SPhN Workshop of the ESNT counting statistics:0.45 dead time correction:0.01 experimental parameters (threshold, HV):0.00 T 1/2 as function of background:0.00 T 1/2 as function of counting rate:0.00 “wrong” implantation:0.00 -------------------------------------------------------------------- Total:0.45   T 1/2 ( 42 Ti) = 208.14 ± 0.45 ms Error budget

19. Teresa Kurtukian Nieto, CENBG April 29th 2011 19 CEA/SPhN Workshop of the ESNT T. Kurtukian Nieto et al., PRC80 (2009) 035502 BR = 48.2(15)% 611 keV Ft = 3114(79) Half-life of 42 Ti: JYFL 2008 42 TiT 1/2 = 208.14 ± 0.45 ms (2.16 ‰)

20. Teresa Kurtukian Nieto, CENBG April 29th 2011 20 CEA/SPhN Workshop of the ESNT Half-life of 42 Ti:

21. Super Allowed Fermi 0+ → 0+: 38 Ca

22. Teresa Kurtukian Nieto, CENBG April 29th 2011 22 CEA/SPhN Workshop of the ESNT Half-life of 38 Ca: ISOLDE 2007 38 CaT 1/2 = 443.8 ± 1.9 ms Blank et al., EPJ A 44,363 (2010)

23. Teresa Kurtukian Nieto, CENBG April 29th 2011 23 CEA/SPhN Workshop of the ESNT Half-life of 38 Ca:

24. Super Allowed Fermi 0+ → 0+: 30 S

25. Teresa Kurtukian Nieto, CENBG April 29th 2011 25 CEA/SPhN Workshop of the ESNT Half-life measurements : 30 S JYFL 2009

26. Teresa Kurtukian Nieto, CENBG April 29th 2011 26 CEA/SPhN Workshop of the ESNT Half-life measurements : 30 S 30 ST 1/2 = 1175.9 ± 1.7 ms (1.45 ‰) Souin, et al., EPJA (2011) 30 P(T 1/2 = 148.88 ± 0.24 s)  as contamination  as daughter need to characterize both contributions - filiation of 30 S no additional parameter - production (mass separator) background constraint required example run

27. Teresa Kurtukian Nieto, CENBG April 29th 2011 27 CEA/SPhN Workshop of the ESNT Half-life measurements : 30 S

28. Teresa Kurtukian Nieto, CENBG April 29th 2011 28 CEA/SPhN Workshop of the ESNT Error budget sensitive improvement for half-lives some difficult work to do for branching ratios 2007 2011

29. Mirror  decay

30. Teresa Kurtukian Nieto, CENBG April 29th 2011 30 CEA/SPhN Workshop of the ESNT Mirror  decay Measurements required:  -decay Q value super-allowed branching ratio  -decay half-life  - angular correlation coefficient N. Severijns, O. Naviliat-Cuncic

31. Teresa Kurtukian Nieto, CENBG April 29th 2011 31 CEA/SPhN Workshop of the ESNT Status in 2009 Experimental quantities: half-lives: feasible

32. Teresa Kurtukian Nieto, CENBG April 29th 2011 32 CEA/SPhN Workshop of the ESNT Mirror transitions: Half-lives of 39 Ca Blank et al., EPJ A 44,363 (2010)

33. Teresa Kurtukian Nieto, CENBG April 29th 2011 33 CEA/SPhN Workshop of the ESNT T. Kurtukian Nieto, A. Bacquias et al. T 1/2 = 2546.4(18) ms Mirror transitions: Half-life of 31 S: JYFL 2009

34. Teresa Kurtukian Nieto, CENBG April 29th 2011 34 CEA/SPhN Workshop of the ESNT JYFL 2009 Mirror transitions: Half-life of 29 P: preliminary T. Kurtukian Nieto, A. Bacquias et al.

35. Teresa Kurtukian Nieto, CENBG April 29th 2011 35 CEA/SPhN Workshop of the ESNT Error budget 2009 2011

36. Branching Ratio Measurements

37. Need to know the efficiency with a precision of 0.1% calibration programme of a monocristal detector: - source measurements - MC simulations Ge Capot Al Detector scheme J. Souin

38. RX of the detector Scanning done with a collimated 137 Cs (CSNSM Orsay) HPGe X-Y table 137 Cs collimated (477MBq) J. Souin

39. Teresa Kurtukian Nieto, CENBG April 29th 2011 39 CEA/SPhN Workshop of the ESNT Determination of the germanium active volumen Front cap Length of the hole (13.6mm larger than expected) J. Souin Scanning done with collimated 137Cs source

40. Teresa Kurtukian Nieto, CENBG April 29th 2011 40 CEA/SPhN Workshop of the ESNT Calibration programme at Bordeaux Gamma sources (with BR know with high precition) done at ISOLDE: 75Se, 27Mg, 24Na, 66Ga, 56Co 133 Ba, 60 Co, 207 Bi, 137 Ce, 152 Eu, 88 Y, 85 Sr, 51 Cr, 54 Mn, 57 Co

41. Teresa Kurtukian Nieto, CENBG April 29th 2011 41 CEA/SPhN Workshop of the ESNT Summary : 0+->0+ 2007 2011

42. Teresa Kurtukian Nieto, CENBG April 29th 2011 42 CEA/SPhN Workshop of the ESNT Summary Mirror Transitions 2009 2011

43. Teresa Kurtukian Nieto, CENBG April 29th 2011 43 CEA/SPhN Workshop of the ESNT The End