UKDMC Status Report 05/07/99 1. NaI SMALL ARRAY 2. NAIAD (50 kg scale up) 3. ZEPLIN I (Lq Xe with PSD) 4. ZEPLIN IIa (two phase Lq Xe) ZEPLIN IIb (advanced.

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UKDMC Status Report 05/07/99 1. NaI SMALL ARRAY 2. NAIAD (50 kg scale up) 3. ZEPLIN I (Lq Xe with PSD) 4. ZEPLIN IIa (two phase Lq Xe) ZEPLIN IIb (advanced two phase Lq Xe) 5. DRIFT (directional with gas) AIM - investigation of “bump” events, new limits DM29 (alpha, beta tests) DM46, DM50, DM55, DM48, Saclay collaboration, new castles 6. BOULBY high resolution option AIM - annual modulation (bump?), new limits first ~8.5 kg unit now being installed in H-area veto option AIM - first Xe expt, new limits, check bump construction at RAL finished veto under test AIM - x100 better sensitivity in two stages space made in stub 2 IC small rig success --> ~0.7 pe/keV ~1 kg “design” rig under construction, IIa design starts in Oct. IIb design with CsI (NSF, DOE funding) AIM - future directional detector progressing towards 1 m 3 design (TPC tests, NSF funding) expansion is proceeding and will continue (e.g. air con.) AIM - to expand!

ZEPLIN II Organization

UKDMC project milestones

Funding and Collaborations 2. Joint Infrastructure Fund - request for £3.8M we need to supply new support material new collaborators, leverage, publicity, mine visits, letters of support... “British Underground Facility for Dark Matter and Neutrino Studies” Coimbra, Portugal (ZEPLIN) Columbia, New York (scintillators) Saclay, Paris (NaI, DRIFT) (Tokyo, Bern, Rome....) but leadership must remain UK 5. Theory links 1. UKDMC rolling grant modified spend profile need to re-bid in year 2 (ZEPLIN, DRIFT, APDs..) 2nd out of 25 bids but deferred until November 3. Other funding DOE, NSF (for ZEPLIN and DRIFT) still awaited INTAS (with ITEP) Treaty of Windsor (Coimbra) Leverhulme Trust, Nuffield (scintillators and DRIFT) Swiss Science Foundation (Dr. Luscher to start in Dec) PIPSS application with SNO - collaboration with Electron Tubes 4. Potential new collaborators with income Lancaster neutralino theory centre SUSYtools network

Discrimination in 1.5kg CsI(Tl) (JCB)

DAMA limits assume (?): Q Na = 0.3, Q I =0.09, V o = 220 kms -1, V esc = 650 kms -1, V Earth = 234 kms -1,  halo.=0.3 GeVcm -3 normalisation by (A) 2 present UKDMC sensitivity (but NOT a limit) DAMA limit (‘96) by PSD DAMA (1+2) “WIMP” UKDMC Sensitivity and DAMA results UKDMC NaI sensitivity recalculated for comparison with DAMA main change is normalisation with A 2 rather than (A-Z) 2