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R&D

Roma2, Roma, LNGS, IHEP/Beijing DAMA site @ www.lngs.infn.it. DAMA: an observatory for rare processes @LNGS. low bckg Ge for sampling meas. LXe. R&D. NaI(Tl) LIBRA. DAMA/LXe experiment: results on rare processes. NIMA482(2002)728. Recent DARK MATTER investigations ...

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R&D

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  1. Roma2, Roma, LNGS, IHEP/Beijing DAMA site @ www.lngs.infn.it DAMA: an observatory for rare processes @LNGS low bckg Ge for sampling meas. LXe R&D NaI(Tl)LIBRA

  2. DAMA/LXe experiment: results on rare processes NIMA482(2002)728 • Recent DARK MATTER investigations ... • Limits on recoils investigating the WIMP-129Xe elastic scattering by means of Pulse Shape Discrimination PLB436(1998)379 • Limits on WIMP-129Xe inelastic scattering PLB387(1996)222, NJP2(2000)15.1 • Neutron calibration PLB436(1998)379, EPJdirectC11(2001)1 • 129Xe vs136Xe by using PSD  comparing SD vs SI signal to increase the sensitivity on the SD component data taking ... other rare processes • Nuclear level excitation of 129Xe during CNC processes PLB465(1999)315 • . • Nucleon and di-nucleon decay into invisible channels • PLB493(2000)12 • Electron decay e- negPRD61(2000)117301 • 2b decay in 134Xe PLB527(2002)182 • Improved results on 2b in 134Xe and 136Xe PLB546(2002)23

  3. DAMA/R&D set-up: results on rare processes • WIMPs: • WIMP search with CaF2(Eu) Astrop.Phys.7(1999)73 • Other rare process: • 2b decay in 136Ce and in 142Ce Il Nuov.Cim.A110(1997)189 • 2EC2n40Ca decay using CaF2(Eu) scintillator Astrop.Phys.7(1999)73 • 2b decay in 46Ca and in 40Ca NPB563(1999)97 • 2b+decay in 106Cd Astrop.Phys.10(1999)115 • 2b and b decay in 48Ca NPA705(2002)29 • 2EC2n in 136Ce and in 138Ce and a decay in 142Ce NIMA498(2003)352 The R&D shield closed The R&D shield open Fulfilling the inner Cu box

  4. ~100 kg NaI(Tl) DAMA set-up: data taking completed on July 2002 Performances: N.Cim.A112(1999)545 Results on rare processes: • Possible Pauli exclusion principle violation PLB408(1997)439 • Nuclear level excitation of 127I and 23Na during CNC processes PRC60(1999)065501 • Electron stability and non-paulian transitions in Iodine atoms (by L-shell) PLB460(1999)235 • Exotic Dark Matter search PRL83(1999)4918 • Search for solar axions by Primakoff effect in NaI(Tl) crystals PLB515(2001)6 • Exotic Matter search EPJdirect C14(2002)1 NaI(Tl) detectors • Results on WI MPS: • PSD: PLB389(1996)757 • Investigation on diurnal effect: N.Cim.A112(1999)1541 • Annual Modulation Signature: PLB424(1998)195, PLB450(1999)448, PRD61(1999)023512, PLB480(2000)23, PLB509(2001)197, EPJ C18(2000)283, EPJ C23 (2002)61, PRD66(2002)043503 Model independent evidence for WIMPs in galactic halo by annual modulation signature 57986 kgd The several peculiar features of the signature satisfied; no systematics or side reactions able to mimic it (see e.g. EPJC18(2000)283)+ some of the many possible model frameworks investigated in the corollary quests for a candidate other 49745 kg d (3 cycles) will be presented in few days @LNGS for a total exposureof: 107731 kgd

  5. The newLIBRAset-up~250 kg NaI(Tl) (LargesodiumIodideBulk forRAreprocesses) in theDAMAexperiment running since March 2003 As a result of a new R&D for radiopurer NaI(Tl) by exploiting new chemical/physical radiopurification techniques (all operations involving crystals and PMTs - including photos - in HP Nitrogen atmosphere) PMT +HV divider storing new crystals etching staff at work Improving installation Installing LIBRA detectors

  6. Summary • Successfully running ~100kg NaI(Tl), 6.5 kg LXe and R&D set-ups over many years • Many rare processes investigated with all the set-ups • LXe alternatively running with 129Xe and 136Xe • R&Dset-up running with small scale expts • 100 kg NaI(Tl): 4 annual cycles released (~60000 kg day) •  Model independent analysis: presence of annual modulation with the proper • features; neither systematics nor side reactionsable to mimic the signature • Model dependent analyses: pure SI coupling, pure SD, mixed SI/SD, WIMP with preferred inelastic scattering in some of the possible model frameworks + studies on the uncertainties of the parameters and on the assumptions + halo models + many other possibilities under study • New data to be presented on July 21, 2003 @LNGS (~110000 kg day) -- set-up out of operation on July 2002 • From an improved R&D for radiopurity DAMA/LIBRA (~250 kg NaI(Tl))running and looking forward: a new R&D for further radiopurifications started, toward 1 ton set-up we proposed in 1996

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