1. Muon capture Durham ‘05 Klaus Jungmann, May 2005 Muon capture

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3. Muon capture Durham ‘05 Matrix Elements for Neutrinoless Double Beta Decay IPPP, Durham, UK, May 23-24, 2005 Interest in ordinary Muon Capture Interest in ordinary Muon Capture for determining intermediate for determining intermediate nuclear states nuclear states Muon Capture long standing topic Muon Capture long standing topic many experiments many experiments Special experiment taylored at PSI: Special experiment taylored at PSI: R02-02 R02-02 some experimental aspects some experimental aspects only scratching surface ! only scratching surface ! Klaus Jungmann, Kernfysisch Versneller Instituut,Groningen

4. Muon capture Durham ‘05 0 2  decay: Only seriously followed Search for Only seriously followed Search for Lepton Number Violation Lepton Number Violation Unique Approach to Majorana/Dirac Unique Approach to Majorana/Dirac  nature question  nature question  Many Experiments Many Experiments High recognition across physics communities boundaries High recognition across physics communities boundaries High Spendings on experiments High Spendings on experiments High demand for Q-values, Matrix Elements High demand for Q-values, Matrix Elements Various opportunities to contribute to solve these issues may Various opportunities to contribute to solve these issues may disappear over the next 5 years (knowledge, people, facilities, …) disappear over the next 5 years (knowledge, people, facilities, …) Coherent Approach would be helpful Coherent Approach would be helpful

5. Muon capture Durham ‘05 CUORICINO confirmation of Heidelberg-Moscow confirmation of Heidelberg-Moscow needed needed independent experiment(s) with different independent experiment(s) with different technologies required need nuclear matrix elements need nuclear matrix elements Neutrinoless Double  -Decay (A,Z)  (A,Z+2) + 2e - T 1/2 m 1/T 1/2 = G 0 (E 0,Z) | M GT + (g V /g A ) 2 ·M F | 2 2 GERDA

6. Muon capture Durham ‘05 Double beta-decay Candidate nuclei 48 Ca, 150 Nd, 96 Zr, 100 Mo, 82 Se, 106 Cd, 116 Cd, 130 Te, 136 Xe, 136 Ce, 76 Ge Investigated so far with OMC: 48 Ca, 48 Ti, 76 Se, 106 Cd, 116 Sn, 150 Sm (typically 1 g samples)

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8. Muon capture Durham ‘05 Muon Production unavoidable background: n from spallation e +,e - from  0 decay

9. Muon capture Durham ‘05 The most intense continuos source of muons – the Cyclotron Facility at the PSI Paul Scherrer Institut

10. Muon capture Durham ‘05 Muon channel(s) at PSI  E4 area has already been given up

11. Muon capture Durham ‘05 The most intense pulsed muon source – ISIS at the RAL Rutherford Appleton Laboratory May become interesting for \muon physics (again) : MICE

12. Muon capture Durham ‘05 The world's strongest source of backward decay pulsed  + or  - he world's strongest source of backward decay pulsed  + or  -he world's strongest source of backward decay pulsed  + or  - Comparison Rates at RAL and PSI: Roughly ratio of p-beam power, i.e. 200kW /1 MW= 1 : 5

13. Muon capture Durham ‘05 The worlds most intense quasi continuous muon source - the LAMPF Los Alamos Meson Physics Facility DEAD

14. Muon capture Durham ‘05 Another continuous source of muons – the Cyclotron Facility at the TRIUMF

15. Muon capture Durham ‘05 J-PARC is one Possibility There are others as well: as well: Neutrino Factory ? Neutrino Factory ? Muon Collider ? Muon Collider ? GSI ? GSI ? …. …. Priorities determine Progress

16. Muon capture Durham ‘05 High Power Frontier: Neutrino Factory, Eurisol, …

17. Muon capture Durham ‘05 Some basics: - Atomic capture of negative muons happens at n 0  M*/m e  14 -Cascade ends typically in hydrogenic systems with 88% in 1s states - Muon transfer to higher Z: energetically preferred - Nuclear Muon Capture primarily from s-states (overlap)  Z 3 /n 3 * Z - Integral Muon Capture rates measured since decades: Just measure lifetime.

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21. Muon capture Durham ‘05 Construction of apparatus to avoid muon transfer to heavier atoms/larger Z

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25. Muon capture Durham ‘05 Muon capture and double beta-decay

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28. Muon capture Durham ‘05 What happens in a typical experiment.

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30. Muon capture Durham ‘05 Double beta-decay Candidate nuclei 48 Ca, 150 Nd, 96 Zr, 100 Mo, 82 Se, 116 Cd, 130 Te, 136 Xe, 136 Ce, 76 Ge Investigated so far: 48 Ca, 48 Ti, 76 Se, 106 Cd, 116 Sn, 150 Sm (typically 1 g samples)

31. Muon capture Durham ‘05 Typical Experiment: PSI R02-02

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33. Muon capture Durham ‘05 Some room for improvement left

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35. Muon capture Durham ‘05 Thank YOU !

36. Muon capture Durham ‘05 SPARES

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