UL UNIVERSIDADE DE LISBOA CENTRO DE FÍSICA NUCLEAR People: Senior Researchers (responsible for...
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Transcript of UL UNIVERSIDADE DE LISBOA CENTRO DE FÍSICA NUCLEAR People: Senior Researchers (responsible for...
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
People:
Senior Researchers (responsible for activity lines):
Eduardo Alves (Head of Lab)
Adelaide Pedro de Jesus
Luís Cerqueira Alves
Miguel Reis
Nuno Barradas
Rui Coelho da Silva
Teresa Pinheiro
Ulrich Wahl
ITN/CFNUL Ion Beam Laboratory
http://cfnul.cii.fc.ul.pt/
http://www.itn.pt/
IAEA Consultant Meeting, Wien 1-2 March 2010
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
IAEA Consultant Meeting, Wien 1-2 March 2010
ITN/CFNUL Ion Beam Laboratory
Van de Graaff 2.5 MV
DanFisik Implanter 210 kV
General Ionex Cockroft-Walton tandetron 3 MV
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Van de Graaff
2.5 MV, 10 A (protons); H, He ions
Lines:
PIXE/Nuclear Reactions
RBS, Chan, ERDA
- probe
PIXE analysis of environmental, biomedical, material science, geological, art,….. samples
Nuclear Reactions for astrophysicsDevelopment of a PIGE methodology
Advanced Materials:Wide bandgap semiconductors and oxides Nuclear fusion reactor materials and mineralogical samples. Multiple quantum wells and quantum dots.
Materials ScienceBiomedicineEnvironmentArchaeometry and ArtMineralogy
IAEA Consultant Meeting, Wien 1-2 March 2010
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
General Ionex Cockroft-Walton tandetron 3MV
NEC Alphatros ion source for He beams Negative ion direct-extraction Duoplasmatron ion
source for H- beams. HICONEX Cs beam multielement negative ion
source
IAEA Consultant Meeting, Wien 1-2 March 2010
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
15 eV resolution (Transition Edge Superconductor -TES) detector
Tandem new lines of activity
Molecular speciation from PIXE spectra
Heavy Ion Elastic Recoil Detection analyses (HIERDA) – A ToF system is under construction to profile light ions using either Cl or I beams.
IAEA Consultant Meeting, Wien 1-2 March 2010
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Two beamlines for AMS:
A) for 14C dating: 2 off-center Faraday cups for parallel current measurement
of 12C3+ and 13C3+, while the 14C3+ detection is by means of an electrostatic
analyzer and a gas proportional counter.
B) Heavy ion ("AUSTRALIS") beamline with HICONEX Cs microbeam (30-300 mm) multielement ("AUSTRALIS") negative ion source. The magnet is able of analyzing 6+ (or higher charge state) ions of all elements up to U at 2.5 MV terminal voltage.Sequential analysis of different isotopes (around +-3% of center mass) in the magnet is possible by means of the "fast bouncing" technique.
UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Tandem new lines of activity
AMS
IAEA Consultant Meeting, Wien 1-2 March 2010
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Tandem new lines of activity
Nuclear Reactions/PIGE
IAEA Consultant Meeting, Wien 1-2 March 2010
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Tandem new lines of activity
Nuclear Reactions/PIGE
IAEA Consultant Meeting, Wien 1-2 March 2010
Beam
X-ray detectorG
amm
a-ra
y de
tect
or
Particle detectors
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
DEPTH
Division of the sample surface in sublayers
YkYkYj
Yj
ERYA CODE
Within each sublayer the stopping power cross sections may be assumed as constant
SAMPLE
PROTON
DEPTH
YmYmYn
Yn YlYl Yi
Yi
Eincident=2380 keV
EincidentE-ΔE
Yield calculated by ERYA
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Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Ei=2380 keVEi=2380 keV
ZOOMZOOM
Excitation function of 25Mg(p,p’)25Mg
Energy (keV)
(E)
arb
itra
ry u
nit
s
Thick targetEbeam=2380 to 0 keV
Thick targetEbeam=2380 to 0 keV
ERYA CODE
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Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
(E)k=5(E)k=5(E)k=6(E)k=6(E)k=4(E)k=4
Energy (keV)
(E)
arb
itra
ry u
nit
s to (E=0)to (E=0)
Number of sublayers is chosen equal to the number of energy steps in the excitation function
Number of sublayers is chosen equal to the number of energy steps in the excitation function
(E)k=3(E)k=3(E)k=2(E)k=2(E)k=1(E)k=1
ERYA CODE
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
The ERYA code - Labview
ERYA CODE
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
Aready accomplished
Li, B, F, Na; Mg, Al for proton energy up to 2.4 MeV
Be for proton energy up to 1.7 MeV
Li, F, Mg for energies up to 4 MeVAnalysis
going on
Work Done
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
Now and near future
The CNO problemGamma-ray spectrum of graphite at 1700 KeV
1
10
100
1000
10000
100000
0 500 1000 1500 2000 2500
Channel Number
Arb
itra
ry U
nit
s
Gamma-ray spectrum of graphite at 3950 keV
1
10
100
1000
10000
100000
0 500 1000 1500 2000 2500
Channel number
Arb
itra
ry U
nit
s
2.36 MeV
12C
2.36 MeV
12C
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
Now and near future
The CNO problem
Near future: Cross Section Measurement of (p, p´) and (p,) reactions on 15N and 18 O
Gamma-ray specrum of AgNO3 at 3950 KeV
1
10
100
1000
10000
100000
0 500 1000 1500 2000 2500 3000
Channel Number
Arb
itra
ry u
nit
s 4.44 MeV
15N
1.98 MeV
18O
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UL UNIVERSIDADE DE LISBOA
CENTRO DE FÍSICA NUCLEAR
Development of a PIGE Methodology
IAEA Consultant Meeting, Wien 1-2 March 2010
The future
Inclusion of profiling in ERYA
Extension of other excitation functions to higher energies – 4 MeV
Coincidence methods to clean up the spectra
Special problems – underground ?