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Spin-Dependent Wimp Limits from a Bubble Chamber

This study explores the elusive nature of dark matter, specifically focusing on Weakly Interacting Massive Particles (WIMPs). The experiment, conducted using a bubble chamber, aims to enhance WIMP detection by minimizing background radiation and improving nuclear recoil detection methods. Despite meticulous adjustments and extended detection periods, the experiment ultimately found no evidence for WIMPs. The results underscore the ongoing challenge of detecting these hypothetical particles, which are believed to constitute a significant portion of the universe's mass.

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Spin-Dependent Wimp Limits from a Bubble Chamber

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  1. 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. 319. no. 5865, pp. 933 - 936

  2. 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??

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

  4. Spoiler: No WIMPs here.

  5. Outline • WIMPs • Bubble Chambers • Bubble Chamber tweaking • For rate • For background • Data • Conclusions

  6. Outline • WIMPs • Bubble Chambers • Bubble Chamber tweaking • For rate • For background • Data • Conclusions

  7. Weakly-Interacting Massive Particles • Hypothetical super-symmetric partners • Not much known (mass, etc) • Like Heavy, Slow neutrinos. • Interacts with WNF and Gravity http://serenitythruhaiku.files.wordpress.com/2009/02/wimp.jpg Axino · Chargino · Gaugino · Gluino · Gravitino · Higgsino · Neutralino · Sfermion

  8. Outline • WIMPs • Bubble Chambers • Bubble Chamber tweaking • For rate • For background • Data • Conclusions

  9. http://maltwood.uvic.ca/physics/Libraries/imagelibrary/29-52low.jpghttp://maltwood.uvic.ca/physics/Libraries/imagelibrary/29-52low.jpg http://en.wikipedia.org/wiki/Bubble_chamber http://beer.thetazzone.com/images/drinkBeer9.jpg

  10. Outline • WIMPs • Bubble Chambers • Bubble Chamber tweaking • For rate • For background • Data • Conclusions

  11. “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

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

  13. Outline • WIMPs • Bubble Chambers • Bubble Chamber tweaking • For rate • For background • Data • Conclusions

  14. *****CF3I*****

  15. Outline • WIMPs • Bubble Chambers • Bubble Chamber tweaking • For rate • For background • Data • Conclusions

  16. 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)Science319 (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).

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