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Nuclear Data Activities at PTB

R. Nolte Physikalisch-Technische Bundesanstalt Braunschweig Fachbereich 6.4. Nuclear Data Activities at PTB. PTB Accelerator Facility. 3.5 MV van-de-Graaf: p, d, a beams CV28 isochronous cyclotron: p (< 19 MeV), d (< 13.5 MeV), a (< 28 MeV)

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Nuclear Data Activities at PTB

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  1. R. Nolte Physikalisch-Technische Bundesanstalt Braunschweig Fachbereich 6.4 Nuclear Data Activities at PTB

  2. PTB Accelerator Facility • 3.5 MV van-de-Graaf: p, d, a beams • CV28 isochronous cyclotron: • p (< 19 MeV), d (< 13.5 MeV), a (< 28 MeV) • ns pulsing systems at both accelerator (Dt = 1.5 ns - 3 ns) • monenerg. neutron beams: • T(d,n), T(p,n), 7Li(p,n) • white neutron beams: • 9Be(p,n), 9Be(d,n)

  3. Reference Instruments • All measurements relative to differential n-p scattering cross section (ENDF/B-V) Reference instruments Recoil Proton Telescopes: 1.2 MeV ≤ En ≤ 200 MeV Recoil Proton Prop. Counter: En 1.2 MeV absolute methods (TCAP) presently not available

  4. TOF spectrometer • PE / Fe collimator fan • flight path: 12 m (35 m) • optimized for 5 MeV - 15 MeV • Neutron sources: • D(d,n) • 15N(p,n) (under dev.) • 9Be(p,n), 9Be(d,n) • .... • available for: • target and detector development • nuclear data work • NE213-Detectors: • M: 1.5”1.5” • D1: 4” 2 ” • D2-5: 10” 2”

  5. Scattering Cross Section D. Schmidt et al. • TOF spectrometer: DE/E 2% • neutron source: D(d,n) (D2 gas target) • (monoenerg. + breakup neutrons) • present energy range: 5 MeV - 15 MeV • measurement capabilities: • elastic and inelastic scattering (DX) • neutron emission spectra (DDX) • present focus: fusion neutronics • future work: • upgrades and extension to lower energies (> 2 MeV) • know-how transfer • …

  6. 28,29,30Si(n,n) and 28,29,30Si(n,n') • Normalization by n-p scattering measurements • Full Monte Carlo simulation • Iterative adjustment of cross sections by comparison of calc. and exp. TOF spectra without breakup correction

  7. Example: Si cross sections D. Schmidt et al.: NDST 2001, Tsukuba

  8. Activation Cross Sections W. Mannhart et al. • Reference reaction: 238U(n,f) • Neutron source: D(d,n) • Correction for activation by breakup neutrons • Energy region: 7 MeV - 15 MeV Measured cross section (as of 2004) 24Mg(n,p)24Na 27Al(n,p)27Mg, 27Al(n,a)24Na 28Si(n,p)28Al, 20Si(n,a)27Mg 46Ti(n,p)46Sc, natTi(n,x)48Sc 51V(n,p)51Ti, 51V(n,a)38Sc 52 Cr(n,p)52V, 52Cr(n,p)52V, 52Cr(n,2n)51Cr 54Fe(n,p)54Mn, 54Fe(n,a)51Cr, 56Fe(n,p)56Mn 59Co(n,p)59Fe, 59Co(n,a)56Mn, 59Co(n,2n)58m+gCo 59Ni(n,p)58Co, 59Ni(n,np)57Co, 58Ni(n,2n)57Ni 63Cu(n,2n)62Cu, 65Cu(n,p)65Ni 64Zn(n,p)64Cu, 64Zn(n,2n)63Zn 93Nb(n,2n)92mNb, 103Rh(n,n')103mRh

  9. Example: Si activation cross sections W. Mannhart et al.: NDST 2001, Tsukuba

  10. Nuclear data at intermediate energies • R. Nolte et al. • Neutron beam facilities at: • Louvain-la-Neuve (UCL) (33 MeV – 60 MeV) • Cape Town (TLABS) (60 MeV – 200 MeV) • Quasi-monoenergetic beams: 7Li(p,n) • Recent projects: • Fission cross sections: 235,238U, 209Bi, natPb • Production of res. nuclei: together with ZSR Hannover • 232Th(n,5ng) by g-detection: together with IReS Strasbourg

  11. UCL Neutron beam facility • Neutron production: 7Li(p,n) 3 mm, 5 mm natLi targets • Proton energy: 25 MeV - 65 MeV • Proton current: 10 nA - 10mA • External beam pulser: pulse separation 500 ns • Three reference neutron beams: Epeak 33 MeV, 45 MeV, 60 MeV

  12. TLABS neutron beam facility • Neutron production:7Li(p,n), 5 mm target • Proton energy:up to 200 MeV • Proton current: max. 3 mA on Li target • External beam pulser: pulse separation 360 ns • Collimator fan:0°, 4°, 8°, 12°, 16° • Characterized neutron beams:Epeak 66, 100, 150, 200 MeV

  13. Neutron reference beams (UCL and TLABS) • Uncertainty of peak fluence: DF 0/F 0 = 0.025 - 0.03 (UCL)(w/o n-p cross section) = 0.04 - 0.05 (TLABS) • Relative peak fluence: F0 /F= 0.3 - 0.4 • High-energy peaks broadened by time resolution of detectors

  14. 232Th(n,5ng)228Th-Experiment • Experiment UCL 07/04: 7Li(p,n)-Beam: Ep = 32, 36.5, 38, 40, 44, 48.5 MeV fluence:FRPT, 238U-FC spectral fluence:FE/FTOF, unfolding beam profile:F(r)/FTLD, image plate g-spectra+TOF:N(Eg)HPGe

  15. Fission cross sections • Fission cross sections measured with PPFC‘s • Fluence measurement with two RPT‘s (rel. to diff. n-p scattering cross section)

  16. Future prospects at PTB • Running projects: • Pb(n,n‘g) with 15N(p,n) source (En = 2 - 4 MeV) • (PhD thesis E. Pönitz) • Wolf Mannhart and Dankwart Schmidt will retire in Nov. 06: • Scattering cross sections: Knowhow transfer! • Activation cross sections: ??? • Nuclear data activities have to be justified by demonstrating external interest

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