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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

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

FLNR Dubna


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

FLNR Dubna

FLNR Dubna


  • Two main structure of lightest nuclei 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

FLNR Dubna


In-flight example structure of lightest nuclei

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

FLNR Dubna


Measurements on structure of lightest nuclei 11B beam @ 32.9AMeV


Measurement method
Measurement method structure of lightest nuclei

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 structure of lightest nuclei


simulations from Lise++ structure of lightest nuclei

experimental data

this let us identify nuclei


FLNR Dubna structure of lightest nuclei


Velocity distributions: DIC & DIRECTcomponents structure of lightest nuclei

Each of this components relates to diffrent reaction mechanism.

FLNR Dubna


Measurements on structure of lightest nuclei 32S beam @ 50.3AMeV


Measurements on structure of lightest nuclei 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 structure of lightest nuclei 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 structure of lightest nuclei 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 structure of lightest nuclei


neutron detector structure of lightest nuclei

voltage divider

photomultiplier

stilbene cristal

FLNR Dubna


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

5H 8He 10He11Li 14Be

FLNR Dubna


each of us mounted a few modules now we have 32 stibene crystals

FLNR Dubna


Special thanks to my always friendly and patient supervisor

special thanks to my always friendly and patient supervisor now we have 32 stibene crystals

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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