THEME02-0-0941-91/2009

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02-0-0941-91/2009

Priority:

Status:

In-progress

Search for Non-Nucleon Degrees of Freedom and Spin Effects
in Few-Nucleon Systems

Leader:	A.D. Kovalenko
Deputies:	N.M. Piskunov G. Martinska V.P. Ladygin

Scientific Programme:
Study of charge-exchange processes in dp -interactions. The measurements of complete set of the np spin observables at 0 ^o -

_L(np),

_T(np), A_00kk(np), A_00nn(np) and R_dp (the total np cross section differences and spin-correlation parameters), using longitudinal (L) and transverse (T) polarized and unpolarized targets as well as quasi-monochromatic relativistic 1-6 GeV neutron beams.Determination of the forward scattering NN amplitudes over this energy region. Comparison of the obtained data with QCD motivated model calculations. Measurement of analyzing powers for the reaction p + CH₂ at polarized proton momentum 3-6 GeV/c. Design and construction of a large aperture polarimeter ALPOM.
Study of highly excited nuclear matter and collectivity effects in nuclear medium; delta and other nucleonic resonance excitations on protons and nuclei. Works on modernization of Saclay-Argonne-JINR polarized proton target. Theoretical investigation of non-nucleon degrees of freedom in the simplest nuclear systems with contribution of relativistic effects, meson and quark-gluon components of the internal movement. Construction of the new models and mechanisms of the processes for which such effects can be manifested in. Exclusive measurements of the rare processes associated with light mesons production, interactions and decay. The study of the properties of strongly interacting matter utilizing polarization phenomena in hadron-nucleon and lepton-nucleon interactions, and in the decay of polarized radioactive atomic nuclei. Obtaining of experimental data on ³He and tritium spin structure up to internal momentum of 600 MeV/c. Preparation of the setup for studying deuteron-proton elastic scattering and deuteron break-up at the Nuclotron internal target. Data taking at polarized deuteron beam. Preparation of the experiment on investigation d

p reaction with the use of polarized ³He target and polarized deuteron beam of the Nuclotron. Preparation of the setup and data taking on the light neutral mesons production in polarized nucleons interaction.

Expected main results in 2008:

Preparation of perspective program and the project of investigations using light ion polarized beams of the JINR accelerator facility for 2009-2014 taking in to account the NICA project realization.
Current work in accordance with the approved projects and collaborative protocols within the frames of their real financial support, including:
a) physics and methodical research with the STRELA, ALPOM, DELTA-SIGMA, pHe3, LNS, DELTA-2 setups at the extracted and internal Nuclotron beam and analysis of the collected data;
b) works on modernization of the MPT, preparation of the setup to exposition at the Nuclotron;
Participation in the joint scientific programs and experiments, design and test of the new detectors and electronics for the use at COSY (Julich), SPS (CERN), RHIC (BNL), TJL (Newport News), FAIR (GSI) in accordance with the approved collaborative agreements.
Development of theoretical methods to calculate deuteron fragmentation and deuteron elastic scattering on protons and nuclear taking into account relativistic and FSI effects.

List of projects:
	Project	Leader	Priority (period of realisation)
1.	STRELA	V.V. Glagolev N.M. Piskunov	1 (2000-2009)
2.	DELTA-SIGMA	L.N. Strunov V.I. Sharov	1 (2001-2009)
3.	DELTA-2	V.A. Krasnov	1 (2003-2009)
4.	LNS	V.P. Ladygin	1 (2001-2009)
5.	pHe3	A.I. Malakhov V.P. Ladygin	1 (1996-2008)
6.	MPT	E.A. Matyushevsky N.S. Borisov	1 (2001-2008)
7.	ALPOM	N.M. Piskunov E. Tomasi-Gustafsson	2 (2001-2008)

List of Activities

Activity or Experiment

Leader

Status

STRELA

N.M. Piskunov

Data taking

DELTA-SIGMA

V.I. Sharov

Data taking

LNS

V.P. Ladygin

Preparation
Data taking
Data analysis

pHe3

A.I. Malakhov
V.P. Ladygin
T. Uesaka

Preparation

DELTA-2

V.A. Krasnov

Preparation
Data taking

ALPOM

N.M. Piskunov
E. Tomasi-Gustafsson
C.F. Perdrisat

Data taking

Modernization of the polarized
proton target

N.S. Borisov

Preparation
Data taking

Theoretical calculations of polarized processes

V.V. Burov
V.K. Lukyanov

Data analysis

Spin effects in hadron-nucleon and lepton-nucleon interactions

M. Finger

Data analysis

Collaboration
Country or international organization	City	Institute or Laboratory
Bulgaria	Sofia	INRNE BAS
		UCTM
CERN	Geneva
Czech Republic	Prague	CU
		CTU
	Rez	NPI ASCR
France	Saclay	SPhN CEA DAPNIA
Germany	Dresden	TUD
	Bochum	RUB
	Julich	FZJ
Japan	Tokyo	UT
	Hiroshima	Hiroshima Univ.
	Osaka	RCNP
Poland	Otwock-Swierk	SINS
Romania	Bucharest	INCDIE ICPE-CA
Russia	Gatchina	PNPI RAS
	Moscow	LPI RAS
		RRC KI
	Troitsk	INR RAS
Slovak Republic	Kosice	IEP SAS
		PJSU
Slovak Republic	Bratislava	IP SAS
Sweden	Uppsala	UU
Switzerland	Geneva	UniGe
	Villigen	PSI
Ukraine	Kharkov	KFTI NASU
USA	Upton, NY	BNL
	Newport News, VA	JLab
	Norfolk, VA	NSU
	Williamsburg, VA	W&M
Uzbekistan	Tashkent	INP UAS
		Assoc."P.-S." PTI

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Search for Non-Nucleon Degrees of Freedom and Spin Effects in Few-Nucleon Systems

Search for Non-Nucleon Degrees of Freedom and Spin Effects
in Few-Nucleon Systems