jinr scientific council 102 nd session, 27-28 september 2007, dubna

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JINR SCIENTIFIC COUNCIL102nd Session, 27-28 September 2007, Dubna


ACTIVITY for the DRIBs PROJECT


S.N. DMITRIEVS.N. DMITRIEV Flerov Laboratory of Nuclear Reactions, Flerov Laboratory of Nuclear Reactions,

Joint Institute for Nuclear ResearchJoint Institute for Nuclear Research



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U400M CYCLOTRONU400M CYCLOTRONU400M CYCLOTRONU400M CYCLOTRON

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DRIBs Transport GalleryDRIBs Transport GalleryDRIBs Transport GalleryDRIBs Transport Gallery

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U 400 CYCLOTRONU 400 CYCLOTRON U 400 CYCLOTRONU 400 CYCLOTRON

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DRIBs ProjectDRIBs Project

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DRIB’s complex equipmentDRIB’s complex equipmentDRIB’s complex equipmentDRIB’s complex equipment

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

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DRIBs DRIBs from 2004 to 2006from 2004 to 2006

DRIBs DRIBs from 2004 to 2006from 2004 to 2006

2004 year Run 2004 year Run

2006 year Run2006 year Run

)(1

103)(

7

66

LiAp

ppsHeI

)(2

102)(

7

76

LiAp

ppsHeI

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Program of modernization of the Program of modernization of the FLNR cyclotron complexFLNR cyclotron complex

Program of modernization of the Program of modernization of the FLNR cyclotron complexFLNR cyclotron complex

1. U400M 1. U400M 2. U400 – U400R.2. U400 – U400R. 3. MT253. MT25

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Modernization Modernization of the U400M cyclotronof the U400M cyclotron

1)1) to increase the light ion beams intensity by to increase the light ion beams intensity by the factor of 4 – 5 for producing of the factor of 4 – 5 for producing of secondary beams, secondary beams,

2)2) to improve the quality of beams,to improve the quality of beams,3)3) to increase the maximal energy of to increase the maximal energy of

accelerated ions up to 100 MeV/A,accelerated ions up to 100 MeV/A,4)4) to improve the radiation safety conditions,to improve the radiation safety conditions,5)5) to accelerate “low” (6÷15 MeV/A) energy to accelerate “low” (6÷15 MeV/A) energy

ions (move some experiments from U400 to ions (move some experiments from U400 to U400M),U400M),

6)6) to extract the beams to the second to extract the beams to the second direction.direction.

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February – September 2007February – September 2007 new axial injection line;new axial injection line; new “warm” ECR ion source (DECRIS-2);new “warm” ECR ion source (DECRIS-2); new magnetic structure of the central region of new magnetic structure of the central region of

U400MR;U400MR; second beam extraction system;second beam extraction system; new producing target for secondary beams;new producing target for secondary beams; new local radiation shielding;new local radiation shielding; superconducting 18-GHz primary beam ion source superconducting 18-GHz primary beam ion source

DECRIS-SC2 (under testing);DECRIS-SC2 (under testing); ““warm” 14-GHz secondary beam ion source (under warm” 14-GHz secondary beam ion source (under

testing).testing).

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Total modernization of the target unitTotal modernization of the target unit

1)1) Development design of the disposable, Development design of the disposable, nonseparable, quick-detachable, target nonseparable, quick-detachable, target block.block.

2)2) 66He output diagnostics from the catcher.He output diagnostics from the catcher.3)3) Creation of effective neutron traps around Creation of effective neutron traps around

the target.the target. 4)4) Ajustment of the new 14 GHz ion source. Ajustment of the new 14 GHz ion source. 5)5) Generation and acceleration of the HeGeneration and acceleration of the He88..

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New axial injection lineNew axial injection line

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New 14 GHz Ion sourceNew 14 GHz Ion source

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Low energy beam line Low energy beam line

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Fusion, transfer and breakup reaction mechanisms induced by halo nucleus 6HeJINR (Dubna), CSNSM (Orsay), IRS (Strasbourg), ULB (Bruxelles), Vanderbilt Univ. (USA)

6He + 166Er 172Yb* 166Yb + 6n

6He + 166Er 170Yb* + 2n

6He + 166Er 168Er* + 4He

166Er(6He,6n)166Yb & 165Ho(6Li,5n)166Yb <==> 166Er(4He,4n)166Yb //PRC48(1993)319//3 2 1

DRIBsNov.-Dec. ’07Chan.2 U400

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MSP-144

Focal plane

Ionizationchamber

Reactionchamber

Si-detectors

Strip-detector

Au-targets

Monitors

Monitor

Deep sub-barrier fusion of Deep sub-barrier fusion of 66He + He + 206206PbPb For E For E < < 20 MeV (20 MeV (22nn channel channel)) MSP-144 (focal plane)MSP-144 (focal plane)

E~2.5MeV

astrophysics, nucleosynthesis

SETUP FOR ACTIVATION MEASUREMENTS with MSP-144

dE/dx~40keV/mmtarget~20mm

E ~ 0.4MeV

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5)5) Cyclotron average magnetic field level Cyclotron average magnetic field level from 0,8 up to 1,8 T.from 0,8 up to 1,8 T.

U400 U400 U400R U400R U400 U400 U400R U400R

2)2) Ion energy variation on the target with factor 5.Ion energy variation on the target with factor 5.

1)1) Beam intensity of masses A ≈ 50 and Beam intensity of masses A ≈ 50 and energy ≈ 6 MeV/n energy ≈ 6 MeV/n up to 3 ρμaup to 3 ρμa..

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

4)4) Beam emittance on the target – 10 π mm · mrad.Beam emittance on the target – 10 π mm · mrad.

6)6) New equipment.New equipment.

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№№ JobsJobs 20072007 20082008 20092009

11 22 33 44 11 22 33 44 11 22 33 44

1.1. DrawingDrawing

2.2. Creation Creation and and equipment equipment completioncompletion

3.3. AssemblingAssembling

4.4. Equipment Equipment and beam and beam testingtesting

Plan of modernizationU400 U400 U400R U400R U400 U400 U400R U400R

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Estimated results and experimental methodEstimated results and experimental methodImmediate object proposed for the primary experiments is the study of complete Immediate object proposed for the primary experiments is the study of complete fusion and breakup reaction of fusion and breakup reaction of 66He halo nuclei taking place in the interactions with He halo nuclei taking place in the interactions with medium mass targets at the energy range E=5-10 MeV/nucleun. The experiment is medium mass targets at the energy range E=5-10 MeV/nucleun. The experiment is aimed at the following tasks:aimed at the following tasks:

1. In a range1. In a range of E of Elablab=55-62 MeV the cross section will be measured for the =55-62 MeV the cross section will be measured for the 166166Er(Er(66He,6n)He,6n)166166Yb reaction. Data on 5n evaporation will be also obtained.Yb reaction. Data on 5n evaporation will be also obtained.Reaction products resulting from the Reaction products resulting from the 66He breakups will be observed too.He breakups will be observed too.2. Population2. Population probabilities will be measured for the levels of the ground-state probabilities will be measured for the levels of the ground-state rotational band in rotational band in 166166Yb. These data will be compared with calculations treating Yb. These data will be compared with calculations treating both the neutron evaporation cascade and the multiple emission of both the neutron evaporation cascade and the multiple emission of rays at the rays at the stage of the nucleus descent along the yrast line. The search of a peculiarity in 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 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 be possible. It will interesting to know if there are orbital momentum going beyond the typical the typical llcritcrit values peculiar to non-halo nuclei. values peculiar to non-halo nuclei.

3. In the case3. In the case of the breakup reactions of the breakup reactions 66He+He+166166Er=>Er=>170170Yb*+Yb*+2n2n and and 66He+He+166166Er=>Er=>168168Er*+Er*+ energy sharing among the breakup cluster (energy sharing among the breakup cluster (2n2n or or ) and recoil nucleus will be ) and recoil nucleus will be estimated from the measured yields of the evaporation residues and the energy estimated from the measured yields of the evaporation residues and the energy spectra Espectra Enn and E and E..

4. Additionally,4. Additionally, 66Li+Li+165165Ho and Ho and 66Li+Li+166166Er reactions will be studied at quite similar Er reactions will be studied at quite similar projectile energies 50-57 MeV. In the 1projectile energies 50-57 MeV. In the 1stst case the same evaporation residue case the same evaporation residue 166166Yb Yb populated in 5n channel will be investigated and in the 2populated in 5n channel will be investigated and in the 2ndnd the products of the the products of the 66Li Li breakup ending with the capture of its breakup ending with the capture of its cluster by cluster by 166166Er will be studied.Er will be studied.Beam time estimation: 4 weeks per Beam time estimation: 4 weeks per 66He and 1 week per He and 1 week per 66Li.Li.

jinr scientific council 102 nd session, 27-28 september 2007, dubna

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