Microwave spectroscopic study of the hyperfine structure of antiprotonic He-3

Friedreich, S. and Barna, Dániel and Caspers, F. and Dax, A. and Hayano, R. S. and Hori, M. and Horváth, Dezső and Juhasz, B. and Kobayashi, T. and Massiczek, O. and Soter, A. and Todoroki, K. and Widmann, E. and Zmeskal, J. (2013) Microwave spectroscopic study of the hyperfine structure of antiprotonic He-3. JOURNAL OF PHYSICS B: ATOMIC MOLECULAR AND OPTICAL PHYSICS, 46 (12). ISSN 0953-4075

Preview

Text 1303.2831v2.pdf Available under License Creative Commons Attribution. Download (1MB) | Preview

Abstract

In this work we describe the latest results for the measurements of the hyperfine structure of antiprotonic 3He. Two out of four measurable super-superhyperfine SSHF transition lines of the (n, L) = (36, 34) state of antiprotonic 3He 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 3He [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 γe = 3.41 ± 0.62 MHz and an inelastic collision rate of γi = 0.51 ± 0.07 MHz.

Actions (login required)

Edit Item