THEME02-2-1049-2003/2006

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02-2-1049-2003/2006

Priority:

Status:

Extended

Astrophysical Studies on Space Experiments

Leader:

L.G. Tkatchev

Scientific Programme:
The TUS space experiment has been proposed to address some of the most important astrophysical and particle physics problems. It is aimed to measure energy spectrum, composition and angular distribution of the Ultra High Energy Cosmic Ray (UHECR) at E

10 ¹⁹-10 ²⁰ eV, to study the region beyond of GZK cut off which puts a question about an alternative mechanism of their origin due to decays of supermassive particles predicted by the Grand Unification Theory and survived after the Big Bang. Existence of such particles is beyond the Standard Model of particle physics and is of great interest to the physical community. A study from the orbit is much more effective in a comparison with ground based detectors. The existing world statistics supposed to be increased in 2-3 times during 3 years of the global data taking. The TUS detector will give in first a possibility to study of UHECP neutrino's Extensive Air Showers (EAS) from a space orbit.
The aim of the NUCLEON Project is direct CR measurements in the energy range 10 ¹¹-10 ¹⁵ eV and atomic charge range up to Z

40 in the near-Earth space to resolve mainly the "knee" problem in CR spectrum: change of the energy spectrum slope from E ^2.7 to E ^3.0 at ~ 10 ¹⁵ eV. The CR phenomena in this energy region are investigated in terrestrial experiments by measurements of EAS parameters or in direct measurements with balloon or space experiments. Below ~ 10 ¹⁴ eV the spectrum and composition are known from direct observation with detectors flown on balloons and earth satellites. However, at higher energies the CR flux is smaller and more difficult for direct observation. The common view is that new experiments over wide charge and energy ranges are needed. They will help to test the existing theoretical conceptions and will become a basis for further studies. Space experiments like NUCLEON have a definite preference and attract more attention. The special interest of the JINR is the search for a signal of heavy particle production with M

0.5 TeV, as expected for the lightest and stable SUSY or WIMP particle that is needed for the dark matter understanding.

Expected main results in 2006:

Completion of the Fresnel mirror R&D for the TUS ground prototype. Design and production of a special tool for Fresnel mirror measurements.
Monte Carlo simulation and Letter of Intent preparation of TUS-M project for International Space Stafior.
EAS radiation study at JINR phasotron.
Design, production and tests of the trigger prototype of the NUCLEON detector.
Development of the MC simulation program for the NUCLEON trigger system.
Design, production and tests of the prototype front-end electronic of the trigger system.

List of projects:
	Project	Leader	Priority (period of realisation)
1.	TUS	L.G. Tkatchev	2 (2002-2006)
2.	NUCLEON	L.G. Tkatchev	1 (2005-2008)

List of Activities

Activity or Experiment

Leader

Status

TUS

L.G. Tkatchev

R&D

NUCLEON

L.G. Tkatchev

R&D

Collaboration
Country or international organization	City	Institute or Laboratory
Czech Republic	Prague	IP ASCR
		CU
France	Annecy-le-Vieux	LAPP
JINR	Dubna	LPP
		BLTP
		LIT
		FLNP
Mexico	Puebla	BUAP
Kazakhstan	Almaty	PTI MS-NAS RK
Republic of Korea	Seoul	EWU
Russia	Moscow	SINP MSU
	Korolev	RSC "Energia"
	Dubna	"Raduga"

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Astrophysical Studies on Space Experiments

List of projects: