Abstract
η-mesic nucleus or the quasibound nuclear state of an η-meson in a nucleus is caused by the strong-interaction force alone. The project SCAN2 is aimed at searching and studying the η-meson nuclei production. The experiment is based on two-arms spectrometer using internal target at the Nuclotron. The setup was designed to study products from η-meson nucleus decay in the reaction d + 12C → (A)η + X → π + p + (A – 2) at deuteron energies from 0:5 to 2:5 GeV/nucl. The energy spectrum of secondary protons has been measured. The dependence of the yields of protons and pions on the beam energy has been obtained. This dependence can show us the minimum energy for the S 11 resonance formation. The first prototype of the neutron detector, which will be used in a new modified experimental setup SCAN3 for recording of neutrons from η-nucleus decays in the πn and pn channels, has been tested. The time-offlight method to obtain the neutron spectrum was used. The time resolution and efficiency of the neutron detector have been obtained.
Highlights
The study of the in-medium properties of hadrons has attracted continuous attention and is one of the most interesting topics of nuclear physics
One can see that the minimal energy of the deuteron beam for η-nuclei production is 0.8 GeV/nucl
The experimental setup SCAN2 will be modified to the experimental setup SCAN3
Summary
The study of the in-medium properties of hadrons has attracted continuous attention and is one of the most interesting topics of nuclear physics. The existence of an η-meson nuclei was postulated in 1986 by Liu and Haider and since a search for such states was conducted in many experiments [1]. In nuclear reactions the η-meson interacts with recoiling nucleon and in the low momentum region the interaction is dominated by the broad nucleon S 11(1535) resonance, which is very close to the η production threshold (49 MeV above the ηN threshold). The decay of this state through the S 11(1535) resonance would lead to a pπ - pair emitted in opposite directions.
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