Biomedical subjects

K Pachucki

Publications and source records attributed to K Pachucki.

16 recordsLinked to original sources

PubMed2006

Isotope shift of the 32S 1/2 -22S 1/2 transition in lithium and the nuclear polarizability.

High precision calculation of the isotope shift of the 3(2)S(1/2)-2(2)S(1/2) transition in lithium is presented. The wave function and matrix elements of relativistic operators are obtained by using recursion relations. Apart from the relativistic contribution, we obtain the nuclear polarizability correction for 11Li. The resulting difference of the squared charge radii 11Li-7Li based on the measurements of Sánchez et al. [Phys. Rev. Lett. 96, 033002 (2006)10.1103/PhysRevLett.96.033002] is deltar(ch)(2)=0.157(81) fm(2), which significantly differs from the previous evaluation.

Journal Article↗

PubMed2005

QED corrections to the parity-nonconserving 6s-7s amplitude in 133Cs.

The complete gauge-invariant set of the one-loop QED corrections to the parity-nonconserving 6s-7s amplitude in 133Cs is evaluated to all orders in alphaZ using a local version of the Dirac-Hartree-Fock potential. The calculations are performed in both length and velocity gauges for the absorbed photon. The total binding QED correction is found to be -0.27(3)%. The weak charge of 133Cs, derived using two most accurate values of the vector transition polarizability beta, is Q(W)=-72.57(46) for beta=26.957(51)a(3)(B) and Q(W)=-73.09(54) for beta=27.15(11)a(3)(B). The first value deviates by 1.1sigma from the prediction of the standard model, while the second one is in perfect agreement with it.

Journal Article↗

PubMed2000

Improved result for helium 2(3)S1 ionization energy

A complete calculation of relativistic and quantum electrodynamic effects to order malpha(6) on the energy of the 2(3)S1 state in helium is presented. The result, beyond the previously known radiative corrections, amounts to -3.00(1) MHz, and significantly reduces the theoretical uncertainty. The improved theoretical predictions are compared to the best available experimental result for the 2(3)S1 state.

Journal Article↗

PubMed1996