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Summer Students Practice Flerov Laboratory of Nuclear Reactions, JINR, Dubna 2010 PowerPoint PPT Presentation


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Summer Students Practice Flerov Laboratory of Nuclear Reactions, JINR, Dubna 2010. Stud ies with radioactive ion beams at fragment separators. student: Maciej Mikulski (UJ) and his supervisor: dr Grzegorz Kaminski. Main goals:. learn how to produce Radioactive Ion Beams (RIBs).

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Summer Students Practice Flerov Laboratory of Nuclear Reactions, JINR, Dubna 2010

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Summer Students Practice

Flerov Laboratory of Nuclear Reactions,

JINR, Dubna 2010

Studieswithradioactiveionbeamsat fragment separators

FLNR Dubna


student:

Maciej Mikulski (UJ)

and his supervisor:

dr Grzegorz Kaminski

FLNR Dubna


Main goals:

learn how to produce Radioactive Ion Beams (RIBs)

get familiar with object of experiments at in-flight separator

make friendship with Lise

identify nuclei from experimental data

get practical knoweledge about neutron detectors

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the Acculinna Group is studying the properities and the structure of lightest nuclei

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  • Two main methods of producing exotic beans:

  • Isotope Separation On-Line (ISOL)

  • In Flight

pure beams

time of life limitation > 0.1 s

beams: keV-GeV

cocktail of isotopes

very short living nuclei > 1 ms

beams: a few teens of MeV-GeV

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In-flight example

B - magnetic rigidityB – vector of magnetic field  - radius of particle trajectory

E ~ a few teens MeV/A

primary beam

thin target

start

stop

detectors

TOF – Time Of Flight

B1

B3

B2

B1< B2<B3

degrader dE – energy losses

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Measurements on 11B beam @ 32.9AMeV


Measurement method

two sytmetrical magnetic sections: dispersive&achromatic

beam

11B 33 AMeV

Si 300 mm 16x16 strips

Si 1mm 16x16 strips

CsI/PD 4 units

9Be (14 mg/cm2)27Al (17 mg/cm2)197Au (9 mg/cm2)

a slit instaled in dispersive focal plane to increase the momentum resolution

~0.13% dp/p


Magnetic field scanning


simulations from Lise++

experimental data

this let us identify nuclei


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Velocity distributions: DIC & DIRECTcomponents

Each of this components relates to diffrent reaction mechanism.

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Measurements on 32S beam @ 50.3AMeV


Measurements on 32S beam @ 50.3AMeV

32S @ 50 AMeV

detectors

9Be, 500m

Beam of isotopes

at B close to 26S

Plastic scintilator

& momentum slit

Wedge 9Be, 500m

& momentum slit


Measurements on 32S beam @ 50.3AMeV

ΔE-ToF identification plots for the cases of separator tuningon 27S (a) and 26S (b)

No events of 26S and 25P !!!

Time of flight (TOF) of 26S too long

Not optimal configuration target & wedge thickness – too thick


Measurements on 32S beam @ 50.3AMeV

Practice 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


neutron detector

voltage divider

photomultiplier

stilbene cristal

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neutron multi detector of 64 modules is beeing constructed, now we have 32 stibene crystals  80 x 50 mm3

5H 8He 10He11Li 14Be

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each of us mounted a few modules

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special thanks to my always friendly and patient supervisor

and to hard-working and ready to help organizators of thispractise

dr Władysław Chmielowski

dr hab. Roman Zawodny

mgr Grzegorz Kamiński

thankyou for yourattention

FLNR Dubna


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