PSAS 2012
International Conference on Precision Physics
of Simple Atomic Systems 2012
Eltville, Germany -
Information

Title:	Dr.
Family Name:	Yerokhin
First Name:	Vladimir
Gender:	male
E-Mail:	yerokhinpcqnt1.phys.spbu.ru
Affiliation for Badge:	St. Petersburg State Polytechnical University
Institute:
Address (Street):	Polytekhnicheskaya 29
Postal Code, City:	195251
Country:	Russia
Phone:	+79119348016
Fax:
Arrival Date:	June 10
Departure Date:	June 15
Excursion with Conference Dinner:	Selected
Payment:	Bank transfer to GSI
Title:	Hyperfine structure of $^3$He, the $^3$He-$^4$He isotope shift, and determination of the nuclear charge radius.
Abstract:	Latest progress in QED theory and experiment of the hyperfine structure of helium and the $^3$He-$^4$He isotope shift is presented. Theoretical progress is achieved through ab initio calculations of the combined fine and hyperfine structure of $2^3P_J^F$ levels of $^3$He. The calculations are complete to order $m\alpha^6$ and represent an order-of-magnitude improvement over previous theoretical studies. Theory is compared with the latest experimental results by the Florence group, which measured seven out of the nine allowed transitions between the 2$^3$S and 2$^3$P hyperfine manifolds of $^3$He with an accuracy ranging from $1\times 10^{-11}$ to $5\times 10^{-12}$, which is the most precise result for any optical $^3$He transition to date. Comparing this value with the known result for the $^4$He centroid, the difference of the squared nuclear charge radii $\delta r^2$ of $^3$He and $^4$He is extracted . The result $\delta r^2=1.075 (3)$ fm$^2$ disagrees by about $4\,\sigma$ with the recent determination [R. van Rooij {\em et al.}, Science {\bf 333}, 196 (2011)]. P. Cancio Pastor, L. Consolino, G. Giusfredi, P. De Natale, M. Inguscio, V.A. Yerokhin, K. Pachucki, Phys. Rev. Lett., in press; http://xxx.lanl.gov/abs/1201.1362

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