flerov laboratory of nuclear reactions keep calm and...
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Keep calm and focus on ACCULINNA
Supervisor: Grzegorz Kaminski Students: Alexi Florica Nicoleta Martin Ansorge Janina Krzysiak Ana Chiriacescu
FLEROV LABORATORY of NUCLEAR
REACTIONS
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Goals
1. ACCULINNA separator 2. Detectors: Si, scintillators (CsI), stilbene crystals 3. Performing calibration of detectors 4. Performing simulation LISE++ program
5. OTPC (Optical Time Projection Chamber)
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ACCULINNA SEPARATOR
• Acculinna is a local separator which provides high quality primary beams or radioactive beams at E~25 MeV/n for physical experiments by fragmentation in flight method.
• Structure of light neutron-rich systems close and beyond the drip-line is the main goal of our investigations.
• We study nuclear reactions under a condition of complete kinematics.Therefore neutron detection is instrumental.
8He&10He: 3H(6He,p)8He & 3H(8He,p)10He reactions
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ACCULINNA-2
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Time of flight (ns) Time of flight (ns)
Δ
E (
MeV
)
Δ
E (
MeV
)
Δ
E1
(M
eV)
Δ
E1
(M
eV)
ΔE2 (MeV) ΔE2 (MeV)
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Detectors of non-charged particles
(a)Stilbene scintilator of 80 mm in diameter and 50
mm thick encapsulated into an aluminium housing
(b)A scheme to a detection module
(c)Stilbene crystals and PMT’s (d)A layout of the neutron detection array in the measurement room
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Detectors with crystals of Si and CsI
CsI crystals detectors
Si crystals detectors
CsI crystals detectors
CsI crystals detectors
Si crystals detectors
CsI crystals detectors
Si crystals detectors
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Energy Calibration
The scintillation amplitude spectra for the stilbene crystal irradiated by γ-rays from 60Co and 137Cs.
The Compton scattering is the dominant interaction of γ-rays with matter, so we used Compton electrons to perform the energy calibration. The Compton edge is determined by using the formula :
Nc = Np + 1,177σ
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PSD-Pulse Shape Discrimination
Fig.1 Typical neutron and γ-ray pulses for stilbene scintillator.
(a) An example of neutron– discrimination plot obtained with a stilbene scintillator;
(b) Data fit is performed by a default ROOT build in procedure using a Gaussian function.
(a) (b)
Fig.2 Division of pulse to slow and fast parts.
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Dependence of PSD for different borders of fast and slow parts of pulse.
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OTPC – Optical Time Projection Chamber
Study of exotic nuclei
Novel approach to kinematical reconstruction of
decay events (delayed-beta decays)
Allows for precise measurement of energy and
angular correlations of decay products
First direct observation of 2p decay (Fe-45)
Downsides: Long dead time
Low energy res (~20%)
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OTPC – Optical Time Projection Chamber
TPC with optical readout
Proportional gaseous
ionization detector
Allows for 3D reconstruction of tracks
Gas mixture optimization:
heavy ions vs low-energy
protons
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Principle of Operation
CCD image
Photomultiplier
signal
Δt
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Set-Up Using Alpha Particles
3650V 3700V
3850V 3800V
3750V
scattering on nucleus
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2p Decay Events of Ni-48
Identification using
standard TOF-ΔE method
CCD
48Ni
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44Cr decay time
Implantation
Decay
Decay time: 42.8 ms Exposition time: 33 ms
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46Fe decay time
Decay time: 14 ms Exposition time: 33 ms
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Detector mounting
Measurement area
Internal parts of the detector
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- - - - - - - -
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α α 10 cm
Drift velocity calculation
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Thank you for your attention!