Hahn echo and criticality in spin-chain systems

We establish a relation between Hahn spin-echo of a spin-$\frac 1 2$ particle and quantum phase transition in a spin-chain, which couples to the particle. The Hahn echo is calculated and discussed at zero as well as at finite temperatures. On the example of XY model, we show that the critical points of the chain are marked by the extremal values in the Hahn echo, and influence the Hahn echo in surprising high temperature. An explanation for the relation between the echo and criticality is also presented.Comment: 5 pages, 6 figure

Reconciliation of experimental and theoretical electric tensor polarizabilities of the cesium ground state

We present a new theoretical analysis of the strongly suppressed F- and M-dependent Stark shifts of the Cs ground state hyperfine structure. Our treatment uses third order perturbation theory including off-diagonal hyperfine interactions not considered in earlier treatments. A numerical evaluation of the perturbation sum using bound states up to n=200 yields ground state tensor polarizabilities which are in good agreement with experimental values, thereby bridging the 40-year-old gap between experiments and theory. We have further found that the tensor polarizabilities of the two ground state hyperfine manifolds have opposite signs, in disagreement with an earlier derivation. This sign error has a direct implication for the precise evaluation of the blackbody radiation shift in primary frequency standards.Comment: 7 pages, 2 figures, accepted for publication in Europhysics Letter

Well Database Appendix

Appendix for the Well Database created by The Research Team (consisting of The Fernald Community Health Effects Committee, Inc. (F-CHEC) and the University of Cincinnati Environmental Health Foundation (UEHF)) to determine the location of each well within the five-mile exposure domain surrounding the former Fernald Uranium Processing Plant. The townships of interest were Fairfield, Morgan and Ross Townships in Butler County and Colerain, Crosby, Harrison and Whitewater Townships in Hamilton County. This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works. If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1004/thumbnail.jp

Well Database Overview

The Fernald Community Health Effects Committee, Inc. (F-CHEC) partnered with the University of Cincinnati Environmental Health Foundation (UEHF) to conduct research aimed at identifying and reviewing existing information on contaminants of water in wells and cisterns in the five-mile exposure domain of the former Fernald uranium processing plant. The F-CHEC and UEHF partnership is hereinafter called the Research Team. The Research Team determined that the existent information on well use in the five-mile exposure domain did not include either the number or the locations of offsite water wells within the exposure domain. Therefore, it was apparent that this project should include a database of offsite water wells within the five-mile exposure domain. This research was completed money allocated during Round 4 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works. If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/fchec/1003/thumbnail.jp

Thyroid Doses and Risk of Thyroid Cancer For Members of Public Exposed to I-131

The purpose of this report is to estimate radiation doses to the thyroid gland and risk of thyroid cancer incidence for individuals exposed to I-131 in fallout from nuclear weapons tested at the Nevada Test Site (NTS) and in releases from different nuclear facilities operated in the United States. Estimates are produced for individuals living around Oak Ridge, Tennessee, who were exposed both to I-131 from NTS fallout and to I-131 released from the X-10 nuclear facility; for individuals living around Hanford, Washington, who were exposed both to I-131 from NTS fallout and to I-131 released from the Hanford facility; and for individuals living in other regions of the country where they were exposed only to I-131 from NTS fallout. Individuals in the latter group lived mostly in areas of Utah, Montana, and Idaho, where deposition of I-131 is known to have been larger than average deposition across the U.S. This research was completed money allocated during Round 2 of the Citizens’ Monitoring and Technical Assessment Fund (MTA Fund). Clark University was named conservator of these works. If you have any questions or concerns please contact us at [email protected]://commons.clarku.edu/radiochem/1001/thumbnail.jp