THEME03-1-0983-92/2001

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03-1-0983-92/2001

Priority:
Status:

1
Approved for completion
in 2001

Study of Multiple Production in 4-geometry and Construction of the SPHERE Spectrometer. First-Line Experiments at the Nuclotron

Leaders:

A.M. Baldin
A. Malakhov

Scientific Programme:

Develoment of the SPHERE spectrometer and experiments on cumulative particle production and correlated phenomena. Search for manifestation of quark-gluon degrees of freedom in collisions of relativistic nuclei and phase transitions in nuclei (SPHERE, SLON, FASA) and exotic resonances. Study of nuclear multifragmentation processes and hyper- and

--nuclei production (SLON, FASA, GIBS). The Nuclotron internal target experiments: two-arm EMCalorimeter, deuteron spin structure investigation (SPHERE). Cumulative particle production by tenzor polarized deuterons. Asymptotics in nuclear collisions, nucleon clusters. Development of data base for bubble chambers statistics. Detector development for relativistic heavy-ion experiments at the SPS (NA49), RHIC (PHENIX). Investigation of the ³He spin structure at RIKEN. Creation of some prototypes of front-end electronics for primary processing; some prototypes of a logic processor; interface and network modules to organize a multichannel multiprocessor data acquisition system. Some developments of LHE-oriented architectures to create the data acquisition system are proposed.

Expected main results in 2001:

Publication of the results on studying the tenzor analyzing power A_yy for reaction of deuteron fragmentation into cumulative pions at nonzero angles.
Publication of the results on studying the A_t-dependence of cross-section of the reaction of fragmentation of deuterons into pions in a twice cumulative region.
Investigations of properties of the nuclear multifargmentation induced by relativistic carbon ions as a function of the beam energy. Beam test of the upgraded 4-set-up (FASA-2).
Study of exotic nuclei interactions (He, Li, B neutron deficit isotopes) in emulsion including irradiations of emulsion stacks by newly prepared beams of secondary nuclei and data analysis.
Measurements and data analysis of spin effects of neutral meson production in polarized proton interactions. First experiments using the Nuclotron internal target to search for exotic eta-nucleus and multiquark state production.
Support of operation of the system for measuring the beam intensity at the Nuclotron.
Design of CAMAC module to generate precise intervals of time, range - 110 ns, a step of time changing is 100 ps.
Design of front-end electronics for a multichannel semiconductor detector.
Design of 8-channel charge to a digital converter (11 bins) to work with fast and slow detectors. The duration of gate is 30 ns - 10 s. The range of measured charge is 500 pC.
Prototype target development for the future "Energy-Transmutation" project including thermometry, nuclear track detector, and activation techniques. Measurements of transmutation cross-sections of radioactive isotopes.
Investigation of the deuteron and ³He spin structure using the polarized deuteron beam at the Nuclotron and RIKEN.

List of Activities
	Activity or project	Spokespersons	Status
1.	SPHERE	A. Litvinenko V. Penev	Data taking
2.	SPHERE (intern. target)	A. Litvinenko V. Penev	Preparation
3.	SLON-EMU01	A. Kovalenko P. Zarubin	Data taking
4.	GIBS	J. Lukstins	Data taking
5.	Study of spin effects in relativistic nuclear reactions	L. Zolin A. Litvinenko	Data taking
6.	FASA	V. Karnaukhov	Data taking
7.	DELTA (INR RAS-JINR)	V. Krasnov P. Zarubin	Preparation Data taking
8.	NA49 (TOF)	A. Malakhov G. Melkumov	Data taking
9.	ELECTRONICS	V. Smirnov	Preparation Data taking
10.	LNS	V. Ladygin	Preparation Data taking

Participating Institutes and Organizations

Armenia	YerPhI, YSU (Yerevan)
Azerbaijan	IP (Baku)
Bulgaria	US, INRNE, CC, UCTM (Sofia)
CERN
Czech Republic	NRI (Rz, Charles Univ. (Prague)
D.P.Republic
of Korea	INE (Pyongyang)
Georgia	HEPI TSU, TSU, IP (Tbilisi)
Germany	THD (Darmstadt), Univ. (Siegen, Karlsruhe) PUM (Marburg), FZJ (Julich)
Greece	AUT (Thessaloniki)
Japan	Univ. (Tsukuba), Nagoya Univ. (Nagoya)
JINR	DLNP, LPP, LIT, BLTP, FLNP, DRRR, SOD
Italy	INFN (Turin), Univ. (Catania)
Kazakhstan	PTI, INP (Almaty)
Mongolia	IPT, NUM (Ulaanbaatar)
Poland	WU, EII, FP WUT, IRE WUT, IEP WU (Warsaw) NINP (Cracow), UL (Lodz) MCSU IP (Lublin), SINS (Otwock, Warsaw)
Romania	Univ., INFIN-HH, INOE2000 (Bucharest)
Russia	SRINP MSU, LPI, SSC-ITEP, MEPI SRC-RRC KI, SRC-RINM (Moscow) FESU (Vladivostok), BSTU, KRI (St.Petersburg) PNPI (Gatchina), SRC-IHEP (Protvino) SSR-IPPE (Obninsk), BINP (Novosibirsk) RSR-IEP (Sarov), INR (Troitsk)
Slovak Republic	UPJS (Kosice), IP, CU (Bratislava)
Sweden	Univ. (Lund)
Ukraine	NSC KIPT, KSU, ISC (Kharkov) BITP, INR (Kiev)
USA	BNL (Upton), UI (Iowa City)
Uzbekistan	INP, PTI (Tashkent), SSU (Samarkand)
Vietnam	IP NCST (Hanoi)
Yugoslavia	Univ. (Podgorica)

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Study of Multiple Production in 4-geometry and Construction of the SPHERE Spectrometer. First-Line Experiments at the Nuclotron

Leaders:

Scientific Programme:

List of Activities

Participating Institutes and Organizations