RIKEN Nuclear Physics Seminar
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Lecturer: Prof. Yu. E. Penionzhkevich
	 (Flerov Laboratory of Nuclear Reactions,
          Joint Institute for Nuclear Research,
          Dubna, Russia)

Title:  RADIOACTIVE ION BEAMS IN DUBNA - THE DRIBs PROJECT

Date:    29th Nov. 2001 (Thu.) 14:00 -

Place:  RIKEN Main Bldg. 2F Seminar Room

Abstract:
The Dubna radioactive beam factory (DRIBs) will make use of two
possibilities for producing secondary beams of radioactive nuclei . During
the first phase of the project (Phase I) the possibility for obtaining
radioactive nuclei in fragmentation reactions of stable nuclei, accelerated
by the cyclotron U400M to intermediate energies (~50 MeV/A), will be
realized. The fragmentation products, obtained in a special ion source, will
be converted into single-charged ions, which after transportation to the
second cyclotron (U400) will be accelerated up to energies of ~20-25 MeV/A.
This method will allow obtaining mainly beams of light radioactive nuclei
with Z < 30 with intensities up to 108 pps (e.g. nuclei such as 6He). In
the
second phase of the project (Phase II) it is supposed to produce and
accelerate radioactive neutron-rich nuclei in the mass region 80< A < 140.
This mass region corresponds to the fragments of low-energy fission of heavy
nuclei. For this reason use will be made of the photofission of 238U. When
the mentioned above parameters of the beam and target are realized, one can
get as much as 1011 fission fragments/second. When the efficiency of the ion
source and the transport system amounts to some 20-30 % it is possible to
obtain beams of fission fragments in the region of Kr and Xe with an
intensity of up to 109 s-1. For the isotopes situated at the "tails" of the
fragment mass distribution (for instance, for 77Ni, 78Ni) the expected
yields are 10^5-10^3 s-1.
The physics program using radioactive ion beams in Dubna is also discussed

Host reseacher: H. Sakurai (Univ. of Tokyo/RIKEN)
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        Contact persons of Nuclear Physics Seminar
        Y. Fukuyama, Y. Nishi, and T. Wakui (RI Beam Science Lab.)
        (email) seminar@rarfaxp.riken.go.jp 
	(FAX)   048-462-4689
        (WWW)   http://rarfaxp.riken.go.jp/~seminar/    
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