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n _TOF activity : 2004 experiments & more

n _TOF activity : 2004 experiments & more. S et in operation of the n_TOF TAC C apture measurements F ission measurements S ummary of 2002, 2003 & 2004 activity P erspectives for future (prelim. draft). alberto.mengoni@cern.ch. n _TOF T AC for (n, g ) measurements.

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n _TOF activity : 2004 experiments & more

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  1. n_TOF activity:2004 experiments & more • Set in operation of the n_TOF TAC • Capture measurements • Fission measurements • Summary of 2002, 2003 & 2004 activity • Perspectives for future (prelim. draft) alberto.mengoni@cern.ch

  2. n_TOF TAC for (n,g) measurements • High detection efficiency: ≈100% • (to be compared with 5% of C6D6 or 0.1% of Moxon-Rae) • Good energy resolution • (direct background suppression mechanisms • based on combined multiplicity and energy • deposition analysis) • 40 BaF2 crystals • 12 pentagons & 28 hexagons • 15 cm crystal thickness • Carbon-fibre 10B-enriched capsules • Full Monte Carlo simulations • all EM cascades • capture events for BG determination n The n_TOF Collaboration

  3. n_TOF TAC for (n,g) measurements • Structure mounted in April-04 • 4pgeometry: end of May-04 • 1.5 month commissioning • Au(n,g) & other standards First measurement with a radioactive sample started in August 2004 237Np(n,g) sample www.cern.ch/n_TOF The n_TOF Collaboration

  4. n_TOF TAC for (n,g) measurements • The n_TOF DAQ • A specific pulse shape analysis routine exists for every detector: Silicon Flux Monitor, C6D6 detectors, PPACs, etc. • For the BaF2 signals: • The TOF is determined by means of a simulated Constant Fraction Discrimination • Both the fast (t=0.7ns) and slow (t=620ns) scintillation components are fitted to a Maxwellian and an exponential (with a fixed t=620ns) shape, respectively • Excellent a/g discrimination • Pileups occurring 300 ns after the first signal are recognised and analysed after performing the necessary baseline correction High data transfer rate: ~ 2 TB/day The n_TOF Collaboration

  5. BaF2 module performances www.cern.ch/n_TOF The n_TOF Collaboration

  6. Neutron Beam C12H20O4(6Li)2 Neutron Absorber 10B loaded Carbon-fibre capsules n_TOF TAC for (n,g) measurements www.cern.ch/n_TOF The n_TOF Collaboration

  7. n_TOF TAC for (n,g) measurements C12H20O4(6Li)2 Neutron Absorber www.cern.ch/n_TOF The n_TOF Collaboration

  8. n_TOF TAC for (n,g) measurements C12H20O4(6Li)2 Neutron Absorber www.cern.ch/n_TOF The n_TOF Collaboration

  9. n_TOF TAC for (n,g) measurements www.cern.ch/n_TOF The n_TOF Collaboration

  10. Plan of measurements www.cern.ch/n_TOF The n_TOF Collaboration

  11. n_TOF TAC for (n,g) measurements All samples sandwiched between thin Al layers (Al total mass < 75 mg) Encapsulated in a 0.35 mm thick Ti canning (Ti total mass ~ 400 mg) Neutron beam Sealing according to ISO2919 (required by CERN-SC/RP) PCB frames 237Np sample Kapton The n_TOF Collaboration

  12. 2004 TAC raw data: 237Np(n,g) www.cern.ch/n_TOF The n_TOF Collaboration

  13. 2004 TAC raw data: 237Np(n,g) www.cern.ch/n_TOF The n_TOF Collaboration

  14. 2004 TAC raw data: 240Pu(n,g) www.cern.ch/n_TOF The n_TOF Collaboration

  15. 2004 TAC raw data: 240Pu(n,g) www.cern.ch/n_TOF The n_TOF Collaboration

  16. 2004 TAC raw data: 243Am(n,g) 1% of statistics www.cern.ch/n_TOF The n_TOF Collaboration

  17. 2003 setup 2004 Fission measurements PPACs chamber FIC-0 chamber Run is going on with FIC-0 & FIC-1 ~ 2.5 x 1018 p • 234,236U, 237Np • 233U, 241,243Am, 245Cm • Calibration measurements with: • 235U, 238U www.cern.ch/n_TOF

  18. n_TOF 2004 campaign summary

  19. Why we do all this? www.cern.ch/n_TOF alberto.mengoni@cern.ch

  20. Objectives of the activity at n_TOF • Measurements of neutron cross sections relevant for Nuclear Waste Transmutation and related Nuclear Technologies (*) • Cross sections relevant for Nuclear Astrophysics • Neutrons as probes for fundamental Nuclear Physics (*) contract with the EC (FP5) ending December 2004 n_TOF-ND-ADS The n_TOF Collaboration

  21. ½ of the elements above Fe are produced by the s-process The astrophysical sites of the s-process are: He burning in intermidiate/massive stars Low-mass AGB’s There exists a direct correlation between the neutron capture cross section and the abundance ((n,g) · N = const.) The neutron capture cross sections are key ingredients for s-process nucleosynthesis n_TOF-0X:(n,g) x-sections The canonical s-process neutrons alberto.mengoni@cern.ch www.cern.ch/n_TOF

  22. Nuclear waste: TRU (1000 MW LWR) 244Cm 0.6 Kg/yr 241Am: 0.5 Kg/yr 243Am: 2.4 Kg/yr 239Pu: 132 Kg/yr 237Np: 10.1 Kg/yr LLFP 52.2 Kg/yr LLFP alberto.mengoni@cern.ch

  23. Nuclear Data needs for ADS • Subcritical reactor core • Spallation neutrons: high energies • Trasmutation of TRU: exotic fuel C Rubbia (1992) protons Accelerator Accelerator Reactor neutrons Zen-ADS www.cern.ch/n_TOF The n_TOF Collaboration

  24. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments • Measurements of neutron cross sections relevant for Nuclear Waste Transmutation and related Nuclear Technologies • Th/U fuel cycle (capture & fission) • Transmutation of MA (capture & fission) • Transmutation of FP (capture) • Cross sections relevant for Nuclear Astrophysics • s-process: branchings • s-process: presolar grains • Neutrons as probes for fundamental Nuclear Physics • Nuclear level density & n-nucleus interaction The n_TOF Collaboration

  25. Perspectives Facility: • Improvements & upgrades of the facility • Spallation target area: improvement of safety requirements • Use of D2O and/or H2O + B-10 admixture • Construction of a second neutron beam-line (short flight-path) • At approx. 20m from the spallation module at 90º from proton beam line Experimental plan: • Nuclear Astrophysics • Measurements of light & intermediate mass x-sections (stable nuclei) • Measurements of short-lived radioactive isotopes (s-process branchings) • (n,p) and (n,a) x-section measurements • Nuclear Data for ADS & Advanced nuclear technologies • Continuation of the plan for measurements of MA (capture & fission) • Additional quantities in fission process (mass distributions, b-delayed n) • Basic nuclear physics • Capture x-sections of light unstable nuclei (ex: 10Be(n,g)11Be) www.cern.ch/n_TOF

  26. The n_TOF Collaboration 40 Research Institutions 120 researchers www.cern.ch/n_TOF

  27. The End

  28. Appendix alberto.mengoni@cern.ch

  29. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments U Abbondanno et al. - The n_TOF Collaboration Phys. Rev. Lett. 93 (2004), 161103 Very low background in capture cross section measurements on radioactive targets

  30. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments U Abbondanno et al. - The n_TOF Collaboration Phys. Rev. Lett. 93 (2004), 161103 n_TOF MACS-30 = 3100 ± 160 mb <D0> = 1.48 ± 0.04 eV, S0 = (3.87 ± 0.20)×10-4 The n_TOF Collaboration

  31. 152Gd 153Gd 154Gd 155Gd 156Gd 157Gd Gd Eu 151Eu 152Eu 153Eu 154Eu 155Eu 156Eu 150Sm 151Sm 93 a 152Sm 153Sm 154Sm Sm Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments U Abbondanno et al. - The n_TOF Collaboration Phys. Rev. Lett. 93 (2004), 161103 • T8 > 4 using the “classical” s-process model • from AGB modeling: 71% of 152Gd Present main uncertainty: lb(T) of 151Sm The n_TOF Collaboration

  32. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments C Domingo-Pardo, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 207Pb(n,g) Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  33. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments C Domingo-Pardo, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 209Bi(n,g) Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  34. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments F Gunsing, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 232Th(n,g) Low PS duty-cycle favours meaasurements on radiactive samples The n_TOF Collaboration

  35. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments F Gunsing, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 232Th(n,g) Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  36. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  37. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  38. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments C Moreau, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  39. 10 mm Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments 93Zr(n,g): raw data from 2004 measurement Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  40. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments 139La(n,g): preliminary analysis R Terlizzi, et al. (INFN) Very low neutron sensitivity of capture g-ray detection systems & high resolution The n_TOF Collaboration

  41. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments Very low background in capture cross section measurements on radioactive targets

  42. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments M Mosconi, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 Very low background in capture cross section measurements on radioactive targets

  43. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments M Mosconi, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 Very low background in capture cross section measurements on radioactive targets

  44. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments D Cano-Ott, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 n_TOF TAC in operation The n_TOF Collaboration

  45. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments D Cano-Ott, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 n_TOF TAC in operation The n_TOF Collaboration

  46. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments D Cano-Ott, et al. - The n_TOF Collaboration ND2004 Conference, Santa Fe, NM – Sept. 2004 1% of statistics n_TOF TAC in operation The n_TOF Collaboration

  47. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments PPACs & FIC-0 (2003) 234U(n,f) An unprecedent wide energy range can be explored at n_TOF in a single experiment The n_TOF Collaboration

  48. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm PPACs & FIC-0 (2003) n_TOF experiments 234U(n,f) High-resolution data up to high(er) energies The n_TOF Collaboration

  49. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm n_TOF experiments FIC-0 (2003) 235U(n,f) An unprecedent wide energy range can be explored at n_TOF in a single experiment The n_TOF Collaboration

  50. Capture 151Sm 204,206,207,208Pb, 209Bi 232Th 24,25,26Mg 90,91,92,94,96Zr, 93Zr 139La 186,187,188Os 233,234U 237Np,240Pu,243Am Fission 233,234,235,236,238U 232Th 209Bi 237Np 241,243Am, 245Cm FIC-1 (2003) n_TOF experiments 236U(n,f) An unprecedent wide energy range can be explored at n_TOF in a single experiment The n_TOF Collaboration

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