Neutrinoless double electron capture experiment at LSM University of Muenster, Germany (Dieter Frekers et al.) Technical University of Dresden, Germany.

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Neutrinoless double electron capture experiment at LSM University of Muenster, Germany (Dieter Frekers et al.) Technical University of Dresden, Germany (Kai Zuber et al.) Czech Technical Universtity, Prague, Czech Republic (Ivan Štekl et al.) Joint Institute of Nuclear Research, Dubna, Russia (Fedor Šimkovic et al.) University of Bratislava, Slovakia (Pavel P. Povinec et al.)

Double Beta Decay Nuclei Double electron capture Emission of 2 electrons Preferable nuclear systems with large  M A (E 5 ) Pairing Nuclear systems with small  M A might be also important (resonant enhancement) Signal from  - and X-rays

e b + e b + (A,Z) → (A,Z-2) +  D.Frekers, hep-ex/  Sujkowski, Wycech, PRC 70, (2004) Modes of the  ECEC-decay: e b + e b + (A,Z) → (A,Z-2) +  + 2   e + e -  Neutrinoless double electron capture Theoretically, not well understood yet: which mechanism is important? which transition is important?

Oscillations of stable atoms (  =0) Double electron capture (  ≠0) (resonant enhancement of atom) Mass difference ~ keV Mass difference >> 

Double electron capture of 112 Sn (perspectives of search) M i -M f T 1/2 ECEC (m   50 meV) ______________________ 1 keV years 100 eV years 10 eV years 0 eV years    ( 76 Ge)= (2.95 – 5.74) years for m   50 meV F. Šimkovic, M. Krivoruchenko, A. Faessler, to be submitted

Calculated double electron capture half-lives (m  = 1 eV) Lepton number and parity oscillations J  =0 +

In comparison with the 0  -decay disfavoured due: process in the 3-rd (4th) order in electroweak theory bound electron wave functions favoured: resonant enhancement ?  Sn Experimental activities ( 112 Sn) T 1/2 > years A.S. Barabash et al., NPA 807 (2008) 269

A.S. Barabash et al., NPA 785 (2007) 371 T 1/2 > 4 x years 74 Se

Muenster and Bratislava groups (exp. in Bratislava) Frekers et al., in preparation 3 kg of Se (27 g of 74 Se)

Present limit 5x10 19 y

Monte Carlo simulation of interaction processes (CERN-GEANT 4) Muons – delta electrons, bremsstrahlung, electron-positron pairs, muon capture Electrons, positrons, photons – bremsstrahlung, annihilation, phoelectric effect, Compton scattering, pair formation Hadrons – nuclear reaction, excitations (CERN-GEISHA and FLUKA)

Muons Vertical flux Simulated muon pass through a HPGe detector (muon momentum 50 GeV/c; energy deposited in the crystal was 1717keV)

Background gamma-spectrum Detector : 200% relative efficiency Shield - small, dia. 20 x 50 cm - medium, dia. 60 x 70 cm - large, dia. 100 x 120 cm Shield thickness : 15 cm

Simulated background in different shields

AntiCompton spectrometer

Background gamma-spectra of coaxial (top) and well (bottom) detectors in the lead shield with anti-cosmic protection in the CAVE facility.

Possible neutrinoless electron capture experiment in LSM Segmented very low background HPGe detectors (≤ 10) in LN (4π geometry): 20cm dia x 20cm long, plus 2 stopcoks of 10cm dia x 10cm long Multiparameter digital electronics Passive shielding made of B+PE and electrolytic copper (muon veto?) 112 Sn, 74 Se,... sources Expected half-life ~10 23 years (for 5 y running, ) Cost ~2 M€

Double electron capture e 1s1/2 + e 1s1/ Sn → 112 Cd(0 + 3 ) Reletivistic electron w.f. (j=1/2, l=0, l’=1) Potential  Width Matrix element Exc. state E ex (MeV) M 0 _________________________ 0 + g.s (1 ph.) (2 ph.) (1 ph.)