THEME03-1-1033-2000/2005

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03-1-1033-2000/2005

Priority:

Status:

Extended

Experiments "Leading Particles"
(Scintillation Magnetic Spectrometer MSU) and SPIN

Leader:

L.I. Sarycheva
A.I. Malakhov
M. Finger

Scientific Programme:
Investigation of leading particles from proton-nucleus interactions at the experimental setup SMS MSU ("Scintillation magnetic spectrometer of Moscow State University") is used to highlight the mechanism of strong interactions, and the spin role in it. In the framework of the programme of the investigation of interactions of polarized protons with nuclei, it is proposed to perform an experimental investigation of single-spin asymmetries of polarized proton scattering on intranuclear nucleons to be compared with analogous characteristics for scattering on free nucleons in the energy range 1-4 GeV. In particular, the analyzing power is measured for p

+ A

p_L + p(n)_R + X and d

+ A

p_L + p(n)_R + X reactions. It permits one to study the spin nuclear structure, anomalous spin phenomena in strong interactions, and is important for the development of nuclear polarimetry. Further research with the setup SMS MSU (for Nuclotron beams only) will be focused on the problem of difference in the production mechanism for leading

-mesons and protons.
Study of spin effects in elastic and inelastic np scattering and in the decay of atomic nuclei (SPIN).

Expected main results in 2004:

Measurement of the quasielastic analyzing power A(,u) of proton-nucleus scattering in the reactions d + A p_L + p + X and d + A p_L + p + n + X at the extracted beam of the Nuclotron and model-theoretical analysis of the obtained data.
Investigation of A-depedence of the analyzing power reduction at A = H, D, Be, C, Cu, Pb.
Obtaining the analyzing power for the reaction np pp ^- and for elastic scattering np np for 270-570 MeV. The development of the methods for dynamic nuclear polarization.

List of Activities

Activity or project

Spokespersons

Status

SMS MSU

A.A. Yershov

Data taking

SPIN

M. Finger

Data analysis

Collaboration
Country or international organization	City	Institute or Laboratory
Czech Republic	Brno	ISI ASCR
	Liberec	TUL
	Prague	CU
		CTU
	Rez	NRI
		NPI ASCR
Germany	Freiburg	Univ.
Russia	Moscow	SINP MSU
Switzerland	Villigen	PSI

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Experiments "Leading Particles" (Scintillation Magnetic Spectrometer MSU) and SPIN

Experiments "Leading Particles"
(Scintillation Magnetic Spectrometer MSU) and SPIN