Spin-Dependent Wimp Limits from a Bubble Chamber E. Behnke,1 J. I. Collar,2* P. S. Cooper,3 K. Crum,2 M. Crisler,3 M. Hu,3 I. Levine,1 D. Nakazawa,2 H.

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Spin-Dependent Wimp Limits from a Bubble Chamber E. Behnke,1 J. I. Collar,2* P. S. Cooper,3 K. Crum,2 M. Crisler,3 M. Hu,3 I. Levine,1 D. Nakazawa,2 H. Nguyen,3 B. Odom,2 E. Ramberg,3 J. Rasmussen,2 N. Riley,2 A. Sonnenschein,3 M. Szydagis,2 R. Tschirhart3* Science 15 February 2008: Vol no. 5865, pp

Why? Why was this experiment done? Dark matter makes up 70% of the universe. We don’t know what dark matter is. It might be WIMP-proton scattering. Wimp-proton scattering is hard to detect. …………Do WIMPs even exist??

What to do? What did this experiment do? Exclude background radiation. Increase detection time to include WIMPs. Improve nuclear-recoil specific detection. Find WIMPs.

Spoiler: No WIMPs here.

Outline WIMPs Bubble Chambers Bubble Chamber tweaking  For rate  For background Data Conclusions

Outline WIMPs Bubble Chambers Bubble Chamber tweaking  For rate  For background Data Conclusions

Weakly-Interacting Massive Particles Hypothetical super-symmetric partners Not much known (mass, etc) Like Heavy, Slow neutrinos. Interacts with WNF and Gravity AxinoAxino · Chargino · Gaugino · Gluino · Gravitino · Higgsino · Neutralino · SfermionCharginoGauginoGluinoGravitinoHiggsino NeutralinoSfermion

Outline WIMPs Bubble Chambers Bubble Chamber tweaking  For rate  For background Data Conclusions

Outline WIMPs Bubble Chambers Bubble Chamber tweaking  For rate  For background Data Conclusions

“deactivate inhomogeneous bubble nucleation centers “ Instead of few milliseconds, ‘indefinite’. - Good for WIMP rate of 1/kg*day worst case scenario: < 1/ton*year Tuned to detect only particles of large stopping power (dE/dx>50keV/um) - slow and big) Just like WIMPs

A.High (60C) B.Moderate (30C)- High dE/dx only ( 222Rn a-decay) C.WIMP

Outline WIMPs Bubble Chambers Bubble Chamber tweaking  For rate  For background Data Conclusions

*****CF3I*****

Outline WIMPs Bubble Chambers Bubble Chamber tweaking  For rate  For background Data Conclusions

References Spin-Dependent WIMP Limits from a Bubble Chamber  E. Behnke, J. I. Collar, P. S. Cooper, K. Crum, M. Crisler, M. Hu, I. Levine, D. Nakazawa, H. Nguyen, B. Odom, E. Ramberg, J. Rasmussen, N. Riley, A. Sonnenschein, M. Szydagis, and R. Tschirhart (15 February 2008) Science 319 (5865), 933. Wikiedia.com G. Jungman, M. Kamionkowski, K. Griest, Phys. Rep. 267, 195 (1996). C. Rubbia, Nucl. Phys. B Proc. Suppl. 36, xvii (1994).