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JINR SCIENTIFIC COUNCIL 102nd Session, 27-28
September 2007, Dubna
ACTIVITY for the DRIBs PROJECT
S.N. DMITRIEV Flerov Laboratory of Nuclear
Reactions, Joint Institute for Nuclear Research
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U400M CYCLOTRON
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(No Transcript)
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DRIBs Transport Gallery
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U 400 CYCLOTRON
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DRIBs Project
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DRIBs complex equipment

• Power supply for magnet 165 units
• ECR-source - 2
• Vacuum pumps - 49
• Beam current diagnostics 35
• Diagnostic station for RIB 9
• RF systems 9

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DRIBs from 2004 to 2006

• 2004 year Run
• 2006 year Run

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Program of modernization of the FLNR cyclotron
complex

• 1. U400M
• 2. U400 U400R.
• 3. MT25

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Modernization of the U400M cyclotron

• to increase the light ion beams intensity by the
  factor of 4 5 for producing of secondary
  beams,
• to improve the quality of beams,
• to increase the maximal energy of accelerated
  ions up to 100 MeV/A,
• to improve the radiation safety conditions,
• to accelerate low (615 MeV/A) energy ions
  (move some experiments from U400 to U400M),
• to extract the beams to the second direction.

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February September 2007

• new axial injection line
• new warm ECR ion source (DECRIS-2)
• new magnetic structure of the central region of
  U400MR
• second beam extraction system
• new producing target for secondary beams
• new local radiation shielding
• superconducting 18-GHz primary beam ion source
  DECRIS-SC2 (under testing)
• warm 14-GHz secondary beam ion source (under
  testing).

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• Total modernization of the target unit
• Development design of the disposable,
  nonseparable, quick-detachable, target block.
• 6He output diagnostics from the catcher.
• Creation of effective neutron traps around the
  target.
• Ajustment of the new 14 GHz ion source.
• Generation and acceleration of the He8.

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New axial injection line
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New 14 GHz Ion source
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Low energy beam line
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New Catcher
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Fusion, transfer and breakup reaction mechanisms
induced by halo nucleus 6He
JINR (Dubna), CSNSM (Orsay), IRS (Strasbourg),
ULB (Bruxelles), Vanderbilt Univ. (USA)
166Er(6He,6n)166Yb 165Ho(6Li,5n)166Yb ltgt
166Er(4He,4n)166Yb //PRC48(1993)319//
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6He 166Er 172Yb 166Yb 6n
6He 166Er 170Yb 2n
6He 166Er 168Er 4He
DRIBs Nov.-Dec. 07 Chan.2 U400
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Deep sub-barrier fusion of 6He 206Pb
For E lt 20 MeV (2n channel) ? MSP-144 (focal
plane)
SETUP FOR ACTIVATION MEASUREMENTS with MSP-144
dE/dx40keV/mm ?target20mm ?E ?0.4MeV
?E?2.5MeV
astrophysics, nucleosynthesis
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U400 ? U400R

• Beam intensity of masses A 50 and
• energy 6 MeV/n up to 3 ?µa.

1. Ion energy variation on the target with factor 5.

1. Energy spread on the target up to 10-3.

1. Beam emittance on the target 10 p mm mrad.

• Cyclotron average magnetic field level
• from 0,8 up to 1,8 T.

1. New equipment.

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U400 ? U400R
Plan of modernization
? Jobs 2007 2007 2007 2007 2008 2008 2008 2008 2009 2009 2009 2009
? Jobs 1 2 3 4 1 2 3 4 1 2 3 4
1. Drawing
2. Creation and equipment completion
3. Assembling
4. Equipment and beam testing
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MICROTRON

• MT25 generator of primary electron beam for
  DRIBs II phase.
• Main problem old subsystems equipment.
• Modernization of MT25 is connected with DRIBs II
  phase.

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JINR SCIENTIFIC COUNCIL 102nd Session, 27-28
September 2007, Dubna
ACTIVITY for the DRIBs PROJECT
S.N. DMITRIEV Flerov Laboratory of Nuclear
Reactions, Joint Institute for Nuclear Research
THANKS FOR YOUR ATTENTION
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Estimated results and experimental method

• Immediate object proposed for the primary
  experiments is the study of complete fusion and
  breakup reaction of 6He halo nuclei taking place
  in the interactions with medium mass targets at
  the energy range E5-10 MeV/nucleun. The
  experiment is aimed at the following tasks
• 1. In a range of Elab55-62 MeV the cross
  section will be measured for the
  166Er(6He,6n)166Yb reaction. Data on 5n
  evaporation will be also obtained.
• Reaction products resulting from the 6He breakups
  will be observed too.
• 2. Population probabilities will be measured for
  the levels of the ground-state rotational band in
  166Yb. These data will be compared with
  calculations treating both the neutron
  evaporation cascade and the multiple emission of
  g rays at the stage of the nucleus descent along
  the yrast line. The search of a peculiarity in
  the values of orbital momentum allowed for the
  compound nucleus formation should be possible. It
  will interesting to know if there are orbital
  momentum going beyond the typical lcrit values
  peculiar to non-halo nuclei.
• 3. In the case of the breakup reactions
  6He166Ergt170Yb2n and 6He166Ergt168Era
  energy sharing among the breakup cluster (2n or
  a) and recoil nucleus will be estimated from the
  measured yields of the evaporation residues and
  the energy spectra En and Ea.
• 4. Additionally, 6Li165Ho and 6Li166Er
  reactions will be studied at quite similar
  projectile energies 50-57 MeV. In the 1st case
  the same evaporation residue 166Yb populated in
  5n channel will be investigated and in the 2nd
  the products of the 6Li breakup ending with the
  capture of its a cluster by 166Er will be
  studied.
• Beam time estimation 4 weeks per 6He and 1 week
  per 6Li.