Spin Correlations of Strongly Interacting Massive Fermion Pairs as a Test of Bell's Inequality
- Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033 (Japan)
- Department of Physics, Saitama University, Saitama 338-8570 (Japan)
- Center for Nuclear Study, University of Tokyo, Tokyo 113-0024 (Japan)
- Department of Physics, Tokyo Institute of Technology, Tokyo 152-8551 (Japan)
- Department of Physics, University of Saskatchewan, Saskatoon (Canada)
- RIKEN, Hirosawa 2-1, Wako, Saitama 351-0198 (Japan)
- Research Center for Nuclear Physics, Osaka University, Osaka 567-0047 (Japan)
We report the results of the first-time test of the local hidden variable theories (Bell-Clauser-Horne-Shimony-Holt) involving strongly interacting pairs of massive spin 1/2 hadrons from the decay of short-lived ({tau}<10{sup -21}sec) {sup 2}He spin-singlet state, populated in the nuclear reaction {sup 2}H+{sup 1}H{yields}{sup 2}He+n. The novel features of this experiment are (a) the use of an 'event body' detector of nearly 100% efficiency to prepare an unbiased sample and (b) a focal-plane polarimeter of full 2{pi} sr acceptance with a random 'post selection' of the reference axes. The spin-correlation function is deduced to be S{sub exp}({pi}/4)=2.83{+-}0.24{sub stat}{+-}0.07{sub sys}. This result is in agreement with nonlocal quantum mechanical prediction and it violates the Bell-CHSH inequality of vertical bar S vertical bar{<=}2 at a confidence level of 99.3%.
- OSTI ID:
- 20860942
- Journal Information:
- Physical Review Letters, Vol. 97, Issue 15; Other Information: DOI: 10.1103/PhysRevLett.97.150405; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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