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Anastasios Lagoyannis Tandem Accelerator Laboratory Institute of Nuclear and Particle Physics

Explore current research projects at the TANDEM Accelerator Laboratory for nuclear and particle physics, including ion beam analysis techniques and differential cross section measurements.

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Anastasios Lagoyannis Tandem Accelerator Laboratory Institute of Nuclear and Particle Physics

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  1. Current and Future projects at the TANDEM accelerator AnastasiosLagoyannis Tandem Accelerator Laboratory Institute of Nuclear and Particle Physics N.C.S.R. “Demokritos”

  2. Tandem Layout γ- calorimetry d-filled gas-cell neutron irradiations Tritiated Ti-target (rotating) μ-PIXE Atomic physics Auger Spectrom. multipurpose scattering chamber 4 HPGe detect. array charged-part. irradiations Charged-particle induced X rays RBS , NRA, ERDA … γ- spectrometry A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  3. n captures M. Arnould and S. Goriely Phys. Rep. 384, 1 (2003) p captures α captures Nuclear Astrophysics HAUSER-FESHBACH THEORY p-process Network of more than 20000 reactions (,n), (,p), (,), n-, p-, -captures, -decays, e-captures • a huge number of cross sections have to be known r := <>max. / <>min. for 14 different sets of nuclear ingredients (OMP, NLD, …) in HF calculations. A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  4. Experimental Methods 15o BGO Mask HPGe (ε =100%) A. Lagoyannis Institute of Nuclear and Particle Physics NCSR “Demokritos”

  5. Angular distribution for γ0,γ1,… primaries ... γ3 γ2 secondaries γ1 γ0 Angular Distribution W()=A0(1+a2P2(cos)+ a4P4(cos)) A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  6. α + 92Μο beam-induced bgd • Solutions (up to now): • Theoretical calculations • Simulation No “real” experimental solution The 4πγ-summing method sum peak BUT =(Y/)*(1/)*(A/NA) =ƒ(E,M) A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  7. pos. a pos. c pos. b Efficiency Calculation in/out ratios: M=1  R = 2 M=2  R = 2 × 2 = 4 M=3  R = 2 × 2 × 2 = 8 M=4  R = 2 × 2 × 2 × 2 = 16 A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  8. BGO Ball • 80 BGO crystals • Thickness = 6.5 cm • ΩBGO~80% • ε ~ 95% @ 1000 keV • εtot~ 70% @ 1000 keV A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  9. Ion Beam Analysis Techniques • Ion Beam Analysis (IBA) is based on the interaction of a high-energy charged particle with the electrons and the nuclei of the material atoms. • This interaction can lead to the emission of particles or radiation the energy of which is characteristic of the elements that constitute the sample material. A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  10. Differential Cross Section Measurement Differential cross sections for EBS - RBS natMg(d,d0) natMg Ed,lab = 1660 – 1990 keV Angles = 90o to 170o Motor driven goniometer Great angular accuracy (0.01 deg.) Up to 4 targets Water cooling available N. Patronis et al, Nucl. Instr. and Meth. B 337 (2014), 97. A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  11. Differential Cross Section Measurement 10B(p,p’γ)10B • Electronically controlled turntable • Initial angles: 0o – 55o – 90o ‐ 165o • 4 HPGe detectors (1 – 80%, 3 – 100%) placed between 25 and 30 cm from target • Air cooled target A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  12. Benchmarking • Acquisition of thick target spectra to different beam energies and angles • Different thick target matrices (channeling - stopping power effects) • Simulation of the spectra with the existing cross sections • Theoretical calculations R - matrix (if possible) V. Paneta et al, Nucl. Instr. and Meth. B 318 (2014), 1 A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  13. NRA Example Plasma Facing Components on JET/Tokamak • Study of the erosion, deposition, materials migration and fuel retention in fusion plasma devices. • Understanding the mechanisms • predict the lifetime of wall components & assess • the amount of fuel retained in the machine • Depth profiling of D, Be, C, N, O • NRA with a deuteron at Ed= 1.7 MeV. A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  14. Elastic Recoil Detection Analysis Suitable for the detection of light elements (Z<17) on heavy substrates Used for H, D, He depth profiling Heavy ions are used as the ion beam Detection of the light nuclei at forward angles In simple ERDA experiments necessary to use filters in front of the detector in order to stop the heavy beam ions A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  15. Time Of Flight ERDA A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

  16. Micro beam Ancient spoon found in Mykines, Greece Au Ca O Si • Beam spot is reduced to μm • micro-structural elemental analysis • Elemental mapping capability • Small samples analysis • Low beam currents • time consuming Zn Cu Ag Mo

  17. External Beam Setup A. Lagoyannis I.N.P.P. Meeting Wednesday 15/11/17

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