A double-hyperfragment event has been found in a hybrid-emulsion experiment. It is identified uniquely as the sequential decay of ( 6)(LambdaLambda)He emitted from a Xi(-) hyperon nuclear capture at rest. The mass of ( 6)(LambdaLambda)He and the Lambda-Lambda interaction energy DeltaB(LambdaLambda) have been measured for the first time devoid of the ambiguities due to the possibilities of excited states. The value of DeltaB(LambdaLambda) is 1.01+/-0.20(+0.18)(-0.11) MeV. This demonstrates that the Lambda-Lambda interaction is weakly attractive.

We present the case for a dark matter detector with directional sensitivity. This document was developed at the 2009 CYGNUS workshop on directional dark matter detection, and contains contributions from theorists and experimental groups in the field. We describe the need for a dark matter detector with directional sensitivity; each directional dark matter experiment presents their project's status; and we close with a feasibility study for scaling up to a one ton directional detector, which would cost around $150M.

A direction-sensitive dark matter search experiment at Kamioka underground laboratory with the NEWAGE-0.3a detector was performed. The NEWAGE-0.3a detector is a gaseous micro-time-projection chamber filled with CF 4 gas at 152 Torr. The fiducial volume and target mass are 20 × 25 × 31 cm 3 and 0.0115 kg, respectively. With an exposure of 0.524 kg·days, improved spin-dependent weakly interacting massive particle (WIMP)-proton cross section limits by a direction-sensitive method were achieved including a new record of 5400 pb for 150 GeV/c 2 WIMPs. We studied the remaining background and found that ambient γ-rays contributed about one-fifth of the remaining background and radioactive contaminants inside the gas chamber contributed the rest.

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Annealing in air and argon each produces an increase of a factor of 5 or more in the photoconductivity/dark conductivity ratio (G ph /G dark ) of vacuum-evaporated tin sulfide (SnS) thin films on glass substrates with copper contacts. No significant increase in G ph /G dark is observed after annealing SnS thin films with silver contacts. Annealing in air at or above 250 • C for 5 min dramatically increases the dark conductivity of the films. Annealing in Ar produces no significant increase in dark conductivity. It is probable that the rise in dark conductivity that accompanies annealing in air is caused by thermal activation of oxygen acceptors followed at higher temperatures by the conversion of SnS to SnO 2 . The films display photoconductivity from the near-infrared to the ultraviolet. The thinnest films we have produced (18 nm) display the highest G ph /G dark and are three times more photoconductive at 400 nm than they are at 700 nm.