Welcome talkIDEA meeting, Prague, 20.-21.4.2006

1. MEDEX workshop news 2. Present status of the TGV II3. Organization remarks

I.ŠteklInstitute of experimental and applied physics, Czech Technical University

I.Štekl, IDEA meeting20.4.2006

ILIAS meeting, Prague, February 7-10, 2005

Organizing committee: Osvaldo Civitarese (University of La Plata), Jouni Suhonen (University of Jyväskylä), Ivan Štekl (Czech Technical University), Haris Kosmas (University of Ioannina)

MEDEX – ILIAS workshop (Corfu, September 2005) (Matrix Elements for the Double-beta-decay EXperiments)

Basic features of MEDEX workshop:- direct connections between theoreticians and experimentalists (ILIAS activities – N3 = direct DM detection; N4 = search on decay; J2 = integrated decay; TA = transnational access),

- two working sessions: NME for double-beta-decay, Nuclear aspects of neutrino physics and dark matter studies.

- contributions will be published in Czechoslovak Journal of Physics

List of participants:A. Barabash: Average half-life values for two neutrino double beta decayJ. Vergados: On the direct detection of SUSY Dark Matter: Exploiting the signatures of the reactionsO. Civitarese: Extracting information about 0 decays from 2 decaysJ. Suhonen: Beta decays and muon capture as probes of double beta matrix elementsV. Egorov: -capture rates in Se and Cd targets I. Stekl: Present results of the TGV experiment EC/EC decay of 106CdF. Avignone: The importance of nuclear matrix elements in the selection of neutrinoless double-beta-

decay experimentsV. Rodin: Description of the double beta decays within continuum QRPAH. Ejiri: Double beta decay matrix elements by charge exchange reactions and photo-nuclear

reactionsJ. Wilson: Double beta decay measurement with the COBRA experimentT. Liolios: Solar neutrinos, solar nuclear reactions and stellar evolutionM. Misiaszek: Scattering of neutrinos on a polarized electron target as a test for new physics beyond

the Standard ModelP. Papakonstantinou: Matrix elements of the - - e- conversion by using CRPAP. Divari: Transition matrix elements for the - - e+ in 27Al W. Westphal: Dark matter search with CRESSTH. Kosmas: Realistic calculations for direct dark matter detectionM. Valverde: Quasi-elastic neutrino-nucleus interactionsV. Hasioti: A compact description of neutrino-nucleus matrix elements

TGV II• to improve 48Ca result

obtained by TGV I• to investigate processes in

106Cd (to focus on EC/EC channel)

),(22 10646

10648 raysXPdCde e

purpose:

2EC/EC:

106Cd:

keVEkeVkeV XECEC 5.235.18:ROI,2778Q /

2:

48Ca:)(2~248

224820 eTiCa e

MeVEMeVkeV e 2.47.2:ROI,4272Q

General view of TGV II setupGeneral view of TGV II setup

Copper> 20 cm

Airtight box

Lead> 10 cm

Polyethylenefilled with

boron 16 cm

Summary of finished activities and present status:- two different setups (for 106Cd and 48Ca) were tunned - detector TGV II is placed in Modane underground laboratory- standard passive methods to suppress the background- suppression of microphonic background- pulse-rise time analysis - TGV spectrometer run one year with enriched 106Cd (Feb.2005-

Feb.2006, 8635 hours)

Future programme of EC/EC measurements: - 106Cd – 12 foils, total mass = 9.948 gr., enrichment = 80%- new HPGe detectors, changing of some materials inside cryostat, more

106Cd, - TGV II now runs with standard Cd

Results after 4800 hours

CdAg

Pd106

106 1060 +1+

0+

2νEC/EC (0+→0+,g.s.) T1/2 ≥ 5.6 x 1019 y (90%CL)2νβ+EC (0+→0+,g.s.) T1/2 ≥ 4.1 x 1019 y (90%CL)

2νβ+EC/512 T1/2 ≥ 5.8 x 1019 y (90%CL)2νEC/EC/512 T1/2 ≥ 2.1 x 1019 y (90%CL)

2+ 512

0+ 11382νEC/EC/1138 T1/2 ≥ 5.3 x 1019 y (90%CL)

Organization remarks:

1) Banquet – Masarykova kolej restaurant, beginning at 20:00 (today)

2) Lunch today – at 14:00

3) Conference fee – 45 EURO

4) Payment of accomodation in hotel Crystal – through organizing committee