1 / 48

The 1 st Research Coordination Meeting Reference Database for PIGE

The 1 st Research Coordination Meeting Reference Database for PIGE Van de Graaff Lab in Tehran activities. This presentation includes:. Introduction of group Research activities of group PIGE activities in Van de Graaff Lab. Main facility of the laboratory.

kael
Download Presentation

The 1 st Research Coordination Meeting Reference Database for PIGE

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. The 1st Research Coordination Meeting Reference Database for PIGE Van de Graaff Lab in Tehran activities

  2. This presentation includes: Introduction of group Research activities of group PIGE activities in Van de Graaff Lab

  3. Main facility of the laboratory 3 MV Van de Graaff electrostatic accelerator producing energetic beams of H+, D+, He+ up to 3 MeV for IBA analysis techniques

  4. TYPICAL ION BEAMS AND INCIDENT ENERGIES USED IN VARIOUSIBA TECHNIQUES:

  5. Proton Scanning Microscopy Analysis of an Archeological Sample

  6. Ge(Li) -ray detector (for PIGE) VACUUM CHAMBER COLLIMATORS Target Ion beam Faraday cup Annular particle Detector (for RBS) Annular particle detector (for ERDA) Si (Li) x-ray detector (for PIXE) CONVENTIONAL IBA EXPERIMENTAL SETUP:

  7. Experimental facilities Conventional IBA reaction chamber Proton Microprobe

  8. RBS-Channeling system

  9. Research activities of group via publications since 1972 • The number of publications exceeds 150, categorized as follows: • Fundamental Research • Environmental Research • Materials Science • Human Health • Archaeology

  10. Fundamental Research

  11. PIGE activities in VDG labNa, Mg, Al and Si excitation function through (p,p'γ) ، (p,γ) ، (p,α γ) reactions

  12. PIGE activities in VDG labNa, Mg, Al and Si excitation function through (p,p'γ), (p,γ)& (p,α γ) reactions

  13. (p,p'γ) Reaction mechanisms

  14. (p,γ) Reaction mechanisms

  15. (p,αγ) reaction mechanisms

  16. Investigation of 23Na by PIGE

  17. 23Na and 20Ne energy levels

  18. Mg: 24Mg 78.8%, 25Mg 10.01%, 26Mg 11.23Likely nuclear reactions

  19. Investigation of Mg by PIGE

  20. 27Al energy levels

  21. Investigation of Al by PIGE

  22. 28Si Energy levels

  23. 28Si 92.23%, 29Si 4.67%, 30Si 11.23%

  24. Likely nuclear reactions between proton and Si

  25. 29Si Energy levels

  26. Overlap of γ-ray emission by different targets

  27. Q-Values for different (p,γ) reactions

  28. Employed reaction chamber

  29. Experimental setup for PIGE

  30. Si excitation function measurements • Energy range: 1.5-2.6 MeV • Charge: 40 µC • Target: Al, Si, NaCl, Mg • Scattering Angle: 135 degree • Detector: HPGe

  31. Si thick target γ-ray yield at different proton energies Ep=2.0 MeV Ep=2.5 MeV Ep=1.5 MeV

  32. γ-ray yield due to excitation levels of Si isotopes at different proton energies

  33. γ-ray yield excitation functions due to natSi+p reactions

  34. γ-ray yield of a thick target bombarded by a proton beam of energy E0 may be written as: Y(E0) = εabs(Eγ) . Np. Fm. Fi . Nav. A-1 . ∫0E0σ(E) / ε( E) dE • εabs(Eγ) absolute efficiency of the detection system • Eγ emitted energy • Np number of incident protons • fm mass fraction (concentration) • A-1 inverse of the atomic mass of the element • fi abundance of isotope i • Nav Avogadro’s number • σ(E) nuclear reaction cross-section • ε( E) stopping cross-section of the sample in units of energy area per mass.

  35. Calculated excitation yields using published resonance widths at different levels Ep(MeV) Ep (keV) dE/dx yield yield* Isotope concen.Ntotal = C×∫σ(E) × dx/dE 326.80 0.2678 0.2 0.010 369.900 0.2600 4.1 3.781 370.700 0.2600 2.7 2.490 371.000 0.2598 1.8 1.660 415.80 0.2520 0.7 0.033 698.40 0.2098 0.9 0.040 724.000 0.2064 0.2 0.148 724.200 0.2064 0.4 0.397 731.00 0.2055 0.5 0.021 917.00 0.1840 0.5 0.023 1094.60 0.1667 0.2 0.005 1175.40 0.1498 0.3 0.009 1203.40 0.1575 1.1 0.034 1213.10 0.1567 0.1 0.002 1288.80 0.1509 0.2 0.007 1297.70 0.1503 0.9 0.028 1301.00 0.1500 0.7 0.022 1302.00 0.1499 1.5 0.070 1321.90 0.1485 1.6 0.050 1330.70 0.1479 0.2 0.007 1348.10 0.1466 0.1 0.002 1380.200 0.1444 63.0 58.105 1381.000 0.1444 16.0 14.757 1389.70 0.1438 2.5 0.078 1398.20 0.1432 3.1 0.096 1470.00 0.1386 0.6 0.026 1480.50 0.1380 3.4 0.105 1482.00 0.1378 2.3 0.071 1.5 1489.70 0.1374 1.4 0.043 542.876 1505.00 0.1364 4.4 0.205 1506.50 0.1364 0.1 0.002 1509.70 0.1362 2.5 0.078 1515.90 0.1358 0.6 0.019 1.6 1595.10 0.1312 0.3 0.009 545.170 1652.000 0.1282 5200.0 4795.960 1660.20 0.1277 0.6 0.019 1667.20 0.1274 0.6 0.019 1669.000 0.1273 4.6 4.243 1680.000 0.1267 2.8 2.573 1686.00 0.1264 9.1 0.425 1.7 1694.20 0.1260 1.7 0.053 38012.864

  36. Calculated Excitation Function of Si ×104

  37. Other Si excitation functions

  38. γ-ray yield of Al thick target at different proton energies 843 keV 27Al(p,pγ)27Al 1369 kev 27Al(p,αγ)24Mg 1779 keV 27Al(p, γ)28Si 1016 keV 27Al(p,pγ)27Al 1460 kev 40K

  39. Measured Al excitation function

  40. Calculated γ-ray yield excitation function at different energies

  41. γ-ray yield of Na thick target at different proton energies Ep=2.0 MeV Ep=1.5 MeV 440 keV 23Na(p,p'γ)23Na 1633 keV 23Na(p,αγ)20Ne 1369 keV 23Na(p, γ)24Mg 1635 keV 23Na(p,p'γ)23Na Ep=2.5 MeV

  42. Measured excitation function for Na

  43. Calculated Na excitation function

  44. γ-ray yield of Mgthick target at different proton energies Ep=1.5 MeV 585 keV 25Mg(p,p'γ)25Mg 1014 keV 25Mg(p,p'γ)25Mg 974 keV 25Mg(p,p'γ)25Mg 1369 keV 25Mg(p,p'γ)25Mg 390 kev 25Mg(p,p'γ)25Mg 844 keV 25Mg(p,p'γ)25Mg Ep=2.0 MeV Ep=2.5 MeV 1460 keV 40K

  45. Measured excitation function of Mg

  46. Estimated excitation function of Mg

  47. γ-ray spectrum of a typical sample

  48. Thank you very much for your attention

More Related