139 citations · 315 across the 7 of their papers we have counts for
7 papers
Vapor-cell frequency reference for short-wavelength transitions in neutral calcium
Jennifer Taylor, Bryan Hemingway, James Hanssen +2
We have characterized the molecular tellurium (Te) spectrum in the vicinity of the 423nm and the 431nm transitions in neutral calcium. These transit…
Microwave-clock timescale with instability on order of
Steven Peil, Thomas B. Swanson, James Hanssen +1
The fundamental limits of atomic fountains as operational clocks are considered. Four rubidium fountains in operation at the U.S. Naval Observatory for over 5.5 years have demonstr…
The USNO rubidium fountains
Steven Peil, James Hanssen, Thomas B. Swanson +2
Four rubidium fountains at the U.S. Naval Observatory (USNO) have been in operation for 4.5 years. Each fountain has demonstrated periods of stability marked by Total or Theo devia…
Evaluation of Long Term Performance of Continuously Running Atomic Fountains
Steven Peil, James L. Hanssen, Thomas B. Swanson +2
An ensemble of rubidium atomic fountain clocks has been put into operation at the U.S. Naval Observatory (USNO). These fountains are used as continuous clocks in the manner of comm…
Tests of local position invariance using continuously running atomic clocks
Steven Peil, Scott Crane, James L. Hanssen +2
Tests of local position invariance (LPI) made by comparing the relative redshift of atomic clocks based on different atoms have been carried out for a variety of pairs of atomic sp…
Scalar interaction limits from the beta-neutrino correlation of trapped radioactive atoms
A. Gorelov, D. Melconian, W. P. Alford +20
We have set limits on contributions of scalar interactions to nuclear beta decay. A magneto-optical trap (MOT) provides a localized source of atoms suspended in space, so the low-e…