The Few Body System Laboratory (FBSL) was officially formed in 1986.
Before that there was a group of physicists in the
Elementary Particle Laboratory (former the Nuclear Structure Laboratory headed by
Prof. A.A.Vorobyev). The group was dedicated to design and construction of a high resolution magnetic spectrometer used afterwards in a series of experiments on 1 GeV diffraction proton-nucleus scattering and in high resolution quasi-elastic p,2p and p,pn scattering experiments. In the case of quasi-elastic scattering experiments, the recoil protons and neutrons were detected in coincidence with the magnetic spectrometer using time-of-light technique.
An overall momentum resolution of about 10-3 was needed in these experiments for reliable separation of the elastic scattering and the scattering with excitation of a nucleus (target) under investigation. This requirement was achieved due to original method of reducing energy spread of the proton beam extracted from the synchrocyclotron, and due also to a high performance of the magnetic spectrometer.
The spectrometer was mounted at a movable platform allowing detection of protons scattered forward in the angular range of 5-33 deg. Using this setup the differential cross sections were measured for the elastic proton-nucleus scattering for a series of nuclear targets in a wide atomic number range. The data were analyzed with the help of the Glauber model. Nuclear matter distributions of a high precision were extracted from the data.
(For more detail review see article
Proton diffraction scattering on nuclei and nuclear matter distributions" in PNPI report of
the High Energy Physics Division "Main Scientific Activities 1971-1996").
References
Use of extracted synchrocyclotron beam for the investigation of
proton-nucleus scattering at 1 gev. (In Russian)
S.L. Belostotskii, G.D. Alkhazov, G.M. Amalskii, A.A. Vorobev, Yu.V.Dotsenko
Pisma Zh.Eksp.Teor.Fiz.17,101-102,1973.
Scattering Of 1-Gev Protons On Nuclei.
G.D. Alkhazov, S.L. Belostotsky, A.A Vorobev
Phys.Rept.42, 89-144, 1978.
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