Klaus Jungmann, May 2005 Muon capture

1. Klaus Jungmann, May 2005 Muon capture

3. Muon Capture and Double Beta-decays International scoping study of a future Neutrino Factory and super-beam facility RAL April 26, 2006 • Interest in ordinary Muon Capture • for determining intermediate • nuclear states • Muon Capture long standing topic • many experiments • Special experiment taylored at PSI: • R02-02 • some experimental aspects • only scratching surface ! Klaus Jungmann, Kernfysisch Versneller Instituut,Groningen Based on talk for : WS on Matrix Elements for Neutrinoless Double Beta Decay, IPPP, Durham, UK , May 23-24, 2005

4. 0n2b decay: • Only seriously followed Search for • Lepton Number Violation • Unique Approach to Majorana/Dirac • n nature question •  • Many Experiments • High recognition across physics communities boundaries • High Spendings on experiments • High demand for Q-values, Matrix Elements • Various opportunities to contribute to solve these issues may • disappear over the next 5 years (knowledge, people, facilities, …) • Coherent Approach would be helpful

5. goal fo KATRIN

6. CUORICINO Neutrinoless Double b-Decay (A,Z)  (A,Z+2) + 2e- 1/T 1/2 = G0n (E0,Z) | MGT + (gV/gA)2 ·MF|2<mn>2 GERDA • confirmation of Heidelberg-Moscow • needed • independent experiment(s) with different • technologies required • need nuclear matrix elements

7. Need to sum over transitions via all possible inter- mediate states, taking relative phases into account  (beyond) state of the art nuclear structure

10. Muon Production unavoidable background: n from spallation e+,e- from p0 decay

11. The most intense continuos source of muons – the Cyclotron Facility at the Paul Scherrer Institut

12. Muon channel(s) atPSI mE4 area has already been given up

13. May become interesting for \muon physics (again) : MICE The most intense pulsed muon source – ISIS at the Rutherford Appleton Laboratory

14. The world's strongest source of backward decay pulsed m+ or m- Comparison Rates at RAL and PSI: Roughly ratio of p-beam power, i.e. 200kW /1 MW= 1 : 5

15. DEAD The worlds most intense quasi continuous muon source - the Los Alamos Meson Physics Facility

16. Another continuous source of muons – the Cyclotron Facility at the TRIUMF

17. J-PARC is one Possibility Priorities determine Progress • There are others • as well: • Neutrino Factory ? • Muon Collider ? • GSI ? • ….

18. High Power Frontier: Neutrino Factory, Eurisol, …

19. Some basics: • - Atomic capture of negative muons happens at n0  M*/me 14 • Cascade ends typically in hydrogenic systems with • < 12% in 2s and > 88% in 1s states • - Muon transfer to higher Z: energetically preferred • Nuclear Muon Capture primarily from s-states (overlap)  Z3/n3 * Z • Integral Muon Capture rates measured since decades: Just measure • lifetime.

23. Construction of apparatus to avoid muon transfer to heavier atoms/larger Z

27. Muon capture and double beta-decay

29. What happens in a typical experiment.

31. Double beta-decay Candidate nuclei 48Ca, 150Nd, 96Zr, 100Mo, 82Se, 116Cd, 130Te, 136Xe, 136Ce, 76Ge Investigated so far: 48Ca, 48Ti, 76Se, 106Cd, 116Sn, 150Sm (typically 1 g samples)

32. Typical Experiment: PSI R02-02

34. Some room for improvement left

36. from Juoni Suhonen

37. Thank YOU !

38. SPARES