Klaus Jungmann, May 2005 Muon capture

1. Klaus Jungmann, May 2005 Muon capture

3. Some Remarks on Experimental Aspects of Muon Cpture Matrix Elements for Neutrinoless Double Beta Decay IPPP, Durham, UK , May 23-24, 2005 • 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

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

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

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

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

11. 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

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

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

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

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

16. 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.

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

24. Muon capture and double beta-decay

26. What happens in a typical experiment.

28. 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)

29. Typical Experiment: PSI R02-02

31. Some room for improvement left

33. Thank YOU !

34. SPARES