Search for the 3He-eta bound state at COSY-11
W. Krzemien, J. Smyrski, A. Budzanowski, E. Czerwinski, R., Czyzykiewicz, D. Gil, D. Grzonka, L. Jarczyk, B. Kamys, A. Khoukaz, P. Klaja,, P. Moskal, W. Oelert, J. Przerwa, J. Ritman, T. Sefzick, M. Siemaszko, M., Silarski, A. Taeschner, M. Wolke, P. Wuestner, J. Zdebik
TL;DR
This paper reports on the search for a bound state of helium-3 and eta meson by measuring the excitation function near the eta production threshold, observing an enhancement suggestive of eta absorption in helium-3.
Contribution
The study provides experimental evidence for eta meson production and absorption in helium-3, exploring the possibility of a helium-3-eta bound state.
Findings
Observed enhancement above eta production threshold
Indication of eta absorption in helium-3 nucleus
Supports existence of helium-3-eta bound state
Abstract
We have measured excitation function for dp -> ppp_pi- reaction near the eta production threshold. We observe an enhancement of the counting rate above the threshold which can originate from the production of the eta meson in the reaction dp -> 3He eta and its subsequent absorption on neutron in the 3He nucleus leading to creation of the p_pi- pair.
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