R&DLXe

low bckg Ge for sampling meas.

NaI(Tl) LIBRA

Roma2, Roma, LNGS, IHEP/Beijing

DAMA site @ www.lngs.infn.it

DAMA/LXe experiment: results on 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- e

PRD61(2000)117301

• 2 decay in 134Xe PLB527(2002)182

• Improved results on 2 in 134Xe and 136Xe

PLB546(2002)23

... other rare processes

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 vs 136Xe by using PSD comparing SD vs SI signal to increase the sensitivity

on the SD component data taking

NIMA482(2002)728

Other rare process:• 2 decay in 136Ce and in 142Ce Il Nuov.Cim.A110(1997)189

• 2EC2 40Ca decay using CaF2(Eu) scintillator Astrop.Phys.7(1999)73

• 2decay in 46Ca and in 40Ca NPB563(1999)97• 2decay in 106Cd

Astrop.Phys.10(1999)115 • 2anddecay in 48Ca

NPA705(2002)29• 2EC2 in 136Ce and in 138Ce and decay in 142Ce NIMA498(2003)352

WIMPs:• WIMP search with CaF2(Eu) Astrop.Phys.7(1999)73

DAMA/R&D set-up: DAMA/R&D set-up: results on rare processes

The R&D shield closed

The R&D shield open

Fulfilling the inner Cu box

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

~100 kg NaI(Tl) DAMA set-up: ~100 kg NaI(Tl) DAMA set-up: data taking completed on data taking completed on July 2002July 2002

NaI

(Tl)

d

etec

tors

Performances: N.Cim.A112(1999)545Results on rare processes:

57986 kgd

Model independent evidence for WIMPs in galactic halo by annual modulation signature

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 exposure of: 107731 kgd

• 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

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)

The new LIBRALIBRA set-up ~250 kg NaI(Tl)~250 kg NaI(Tl)(Large sodium Iodide Bulk for RAre processes)

in the DAMA experiment

running since March 2003

The new LIBRALIBRA set-up ~250 kg NaI(Tl)~250 kg NaI(Tl)(Large sodium Iodide Bulk for RAre processes)

in the DAMA experiment

running since March 2003

Improving installation etching staff

at work

PMT+HV divider

storing new crystals

Installing LIBRA detectors

Summary

• LXe alternatively running with 129Xe and 136Xe

• R&D set-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 reactions able to mimic the signatureModel 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

Many rare processes investigated with all the set-ups

• From an improved R&D for radiopurity

Successfully running ~100kg NaI(Tl), 6.5 kg LXe and R&D set-ups

over many years

DAMA/LIBRA DAMA/LIBRA (~250 kg NaI(Tl))(~250 kg NaI(Tl)) running running and looking and looking forward:forward:

a a new R&D for further R&D for further radiopurifications started, toward 1 ton set-up we proposed started, toward 1 ton set-up we proposed in 1996in 1996

New data to be presented on July 21, 2003 @LNGS (~110000 kg day) -- set-up out of operation on July 2002