Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3
Abstract
In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic helium-3. Two out of four measurable super-super-hyperfine SSHF transition lines of the (n,L)=(36,34) state of antiprotonic helium-3 were observed. The measured frequencies of the individual transitions are 11.12548(08) GHz and 11.15793(13) GHz, with an increased precision of about 43% and 25% respectively compared to our first measurements with antiprotonic helium-3 [S. Friedreich et al., Phys. Lett. B 700 (2011) 1--6]. They are less than 0.5 MHz higher with respect to the most recent theoretical values, still within their estimated errors. Although the experimental uncertainty for the difference of 0.03245(15) GHz between these frequencies is large as compared to that of theory, its measured value also agrees with theoretical calculations. The rates for collisions between antiprotonic helium and helium atoms have been assessed through comparison with simulations, resulting in an elastic collision rate of gamma_e = 3.41 +- 0.62 MHz and an inelastic collision rate of gamma_i = 0.51 +- 0.07 MHz.
Keywords
Cite
@article{arxiv.1303.2831,
title = {Microwave spectroscopic study of the hyperfine structure of antiprotonic helium-3},
author = {Susanne Friedreich and Daniel Barna and Fritz Caspers and Andreas Dax and Ryugo S. Hayano and Masaki Hori and Dezső Horváth and Bertalan Juhász and Takumi Kobayashi and Oswald Massiczek and Anna Sótér and Koichi Todoroki and Eberhard Widmann and Johann Zmeskal},
journal= {arXiv preprint arXiv:1303.2831},
year = {2016}
}
Comments
15 pages, 9 figures. arXiv admin note: substantial text overlap with arXiv:1102.5286