THEME03-2-1040-2001/2009

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03-2-1040-2001/2009

Priority:

Status:

In-progress

Nucleus and Particle Interactions at Intermediate Energies

Leader:

D.A. Mzhavia

Scientific Programme:
Investigation of processes of strong, weak and electromagnetic interaction of elementary particles and light nuclei at intermediate energies with the aim of determining symmetries and dynamics of the interactions. Development and construction of setups for experiments at accelerators (JINR phasotron, PSI meson factory, COSY proton synchrotron) for obtaining new information and testing the present theoretical views in the topics. Development of projects for new experiments and experimental methods for intermediate-energy physics.

Expected main results in 2008:

Upgrade of PEN detector at PSI for a measurement of the ⁺ e ⁺ decay branching ratio. Manufacture of drift chambers for positron tracking in the MEG detector.
Measurement with polarized beams and subsequent analysis of data on the processes d p (pp)_s n and p p (pp)_s ⁰ at ANKE. Preparations of the experiment at COSY for testing of the method, suggested in PAX, to polarized a beam and the first stage of development of the trigger concept for PAX.
The Deuterium High Pressure Target (DHPT) and its gas handling system will be created together with the support system for the passive shielding of gamma-spectrometer (25 MeV) and its thermostatic system. In the composed installation we will study the parameters of the background suppression system on the base of the new trigger-block of the experiment.
Determination of branching ratios for reaction channels of positive and negative pion interactions with the helium nucleus, including the reaction channel, observed for the first time involving the emission of a photon; further processing of previously obtained data (CCD images of reaction events); performing runs at the LNP phasotron. Publication of articles with results.
The data taking on the accelerators of JINR and the meson factory at PSI (Switzerland). Study of the influence of axial pressure and the impurities on the acceptor parameters in the diamond-like superconductors. Investigation of the muon depolarisation rate in the ferrofluid components.

List of projects:
	Project	Leader	Priority (period of realisation)
1.	DUBTO	N.A. Russakovich D.B. Pontecorvo	1 (1998-2009)
2.	CATALYSIS	D.L. Demin	1 (2003-2009)
3.	МЮОН	V.N. Duginov T.N. Mamedov	1 (1997-2009)
4.	MEG-PEN	N.A. Kuchinskiy	1 (2007-2009)
5.	SPRING	A.V. Kulikov	1 (2007-2009)

List of Activities

Activity or Experiment

Leader

Status

MEG-PEN

N.A. Kuchinskiy

Preparation
Production

SPRING

A.V. Kulikov

Data taking

DUBTO

N.A. Russakovich
G. Piragino

Data taking

CATALYSIS

D.L. Demin

Preparation
Data taking

MUON

V.N. Duginov
T.N. Mamedov

Data taking

Collaboration
Country or international organization	City	Institute or Laboratory
Azerbaijan	Baku	IP ANAS
Belarus	Minsk	NC PHEP BSU
		INP BSU
Bulgaria	Sofia	SU
Croatia	Zagreb	RBI
Canada	Vancouver	TRIUMF
Georgia	Tbilisi	IHEPI TSU
Germany	Aachen	RWTH
	Heidelberg	Univ.
	Julich	FZJ
	Cologne	Univ.
	Munster	Univ.
	Rossendorf	FZR IKH
	Stuttgart	MPI-MF
Italy	Frascatti	INFN LNF
	Rome	Univ. I
	Turin	INFN
Netherlands	Delft	TUDelft
Poland	Otwock-Swierk	SINS
Russia	Alexandrov	VNIISIMS
	Gatchina	PNPI RAS
	Moscow	ITEP
		GPI RAS
		MSU
		SINP MSU
		RRC KI
	Sarov	VNIIEF
	Troitsk	INR RAS
Switzerland	Zurich	Univ.
		ETH
	Villigen	PSI
USA	Charlottesville, VA	UVa
	Pittsburgh, PA	Univ.
	Tucson, AZ	UA

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