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Klaus Jungmann, May 2005 Muon capture

Klaus Jungmann, May 2005 Muon capture. 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

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Klaus Jungmann, May 2005 Muon capture

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  1. Klaus Jungmann, May 2005 Muon capture

  2. 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

  3. 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

  4. 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

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

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

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

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

  9. 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

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

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

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

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

  14. 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.

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

  16. Muon capture and double beta-decay

  17. What happens in a typical experiment.

  18. 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)

  19. Typical Experiment: PSI R02-02

  20. Some room for improvement left

  21. Thank YOU !

  22. SPARES

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