Limits on asymmetric orthopositronium formation in high Z optically active molecules

Details Limits on asymmetric orthopositronium formation in high Z optically active molecules Limits on asymmetric orthopositronium formation in high Z optically active molecules

Mar 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985orli...16...81v&link_type=abstract

Origins of Life and Evolution of the Biosphere, Volume 16, Issue 1, pp.81-87

Mathematics

Logic

3

Scientific paper

The proposed connection between the parity violating handedness of beta particles in radioactive decay and the sign (L) of biological chirality (the Vester-Ulbricht [V-U] hypothesis) is experimentally tested. The theoretically predicted asymmetry in triplet positronium formation (A Ps) is measured in several highZ optically active molecules using low energy positrons with a net helicity. We findA Ps<3×10-4 in selenocystine (Z=34) and thyroxine (Z=53), excluding part of the theoretically predicted range of 4×10-3> A Ps>2×10-6 in these molecules. The connection between these limits and limits on asymmetric radiolysis (A R) is made, with a new limit ofA R>10-9 being placed. This limit onA R, which is thirty times lower than a previous measurement in the amino acid leucine (Z=6), is still not small enough to rule out the V-U hypothesis.

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