HEAVY ION COLLIDER FACILITY NICA AT JINR (DUBNA): STATUS ...
23 July 2010FLNR Dubna Summer Students Practice Flerov Laboratory of Nuclear Reactions, JINR, Dubna...
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Transcript of 23 July 2010FLNR Dubna Summer Students Practice Flerov Laboratory of Nuclear Reactions, JINR, Dubna...
23 July 2010 FLNR Dubna
Summer Summer StudentsStudents Practice PracticeFlerov Laboratory of Flerov Laboratory of NuclearNuclear Reactions, Reactions,
JINR, JINR, DubnaDubna 2010 2010
Studies with radioactive ion beams at fragment separators
23 July 2010 FLNR Dubna
student:Maciej Mikulski (UJ)
and his supervisor:dr Grzegorz Kaminski
23 July 2010 FLNR Dubna
Main goals:
learn how to produce Radioactive Ion Beams (RIBs)
get practical knoweledge about neutron detectors
make friendship with Lise
identify nuclei from experimental data
get familiar with object of experiments at in-flight separator
23 July 2010 FLNR DubnaFLNR Dubna
the Acculinna Group is studying the properities and the structure of lightest nuclei
23 July 2010 FLNR Dubna
cocktail of isotopes
beams: a few teens of MeV-GeV
very short living nuclei > 1 s
beams: keV-GeV
time of life limitation > 0.1 s
pure beams
Two main methods of producing exotic beans:• Isotope Separation On-Line (ISOL)• In Flight
23 July 2010 FLNR Dubna
thin targetprimary beam
E ~ a few teens MeV/A
TOF – Time Of Flight
B - magnetic rigidityB – vector of magnetic field
- radius of particle trajectory
degrader dE – energy losses
start stopdetectors
BB11 < B< B22<< BB33
BB11
BB22
BB33
In-flight example
Measurements on 11B beam @ 32.9AMeV
Measurement method
~0.13% dp/p
11B 33 AMeV
9Be (14 mg/cm2) 27Al (17 mg/cm2) 197Au (9 mg/cm2)
beam
Si 300 m 16x16 stripsSi 1mm 16x16 stripsCsI/PD 4 units
two sytmetrical magnetic sections:
dispersive&achromatica slit instaled in
dispersive focal plane to increase the momentum
resolution
Magnetic field scanning
experimental data
simulations from Lise++
this let us identify nuclei
23 July 2010 FLNR Dubna0.5 1.0 1.5
10-3
10-1
101
103
105
0.5 1.0 1.510-3
10-1
101
103
105
0.5 1.0 1.510-3
10-1
101
103
105
10C
11C
8B
11B +
9Be
LISE
10B
11B12
B
7Be
9Be
10Be
11Be
6Li
R.Y
.
7Li
8Li
9Li
4He
vfrag
/vbeam
6He
8He
2 20(v-v ) /2 rel
dNBe
dv
23 July 2010 FLNR Dubna
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
500
1000
1500
2000
2500
3000
3500
4000
Deep Inelastic component
experiment gaussian
Re
lativ
e Y
ield
s
vfrag
/vbeam
7Li
Direct (breakup) component
0.5 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3
Velocity distributions: DIC & DIRECTcomponents
Each of this components relates to diffrent reaction mechanism.
Measurements on 32S beam @ 50.3AMeV
Measurements on 32S beam @ 50.3AMeV
32S @ 50 AMeV
9Be, 500m
Wedge 9Be, 500m& momentum slit
Plastic scintilator& momentum slit
Beam of isotopes at B close to 26S
detectors
ΔE-ToF identification plots for the cases of separator tuning on 27S (a) and 26S (b)
Measurements on 32S beam @ 50.3AMeV
No events of 26S and 25P !!!
Time of flight (TOF) of 26S too longNot optimal configuration target & wedge thickness – too thick
Measurements on 32S beam @ 50.3AMeVPractice goal: find better configuration of target&wedge for new measurements on 32S beam – a compromise between 26S energy (TOF), target and wedge thickness and data acquisition dead time
wedge 100μm
wedge 200μm
wedge 300μm
wedge 500μm
neutron detectors
23 July 2010 FLNR Dubna
voltage divider
photomultiplier
stilbene cristal
neutron detector
23 July 2010 FLNR Dubna
5H 8He 10He 11Li 14Beneutron multi detector of 64
modules is beeing constructed, now we have 32 stibene crystals
80 x 50 mm3
23 July 2010 FLNR Dubna
each of us mounted a
few modules
special thanks to my always friendly and patient supervisor
23 July 2010 FLNR Dubna
and to hard-working and ready to help organizators of this practise