Experimental Activities in Europe P. Rullhusen IRMM - Institute - PowerPoint PPT Presentation

1 Joint Research Centre (JRC) Experimental Activities in Europe P. Rullhusen IRMM - Institute for Reference Materials and Measurements Geel - Belgium http://irmm.jrc.ec.europa.eu/ http://www.jrc.ec.europa.eu/

P. Rullhusen WPEC JAEA 4-6 June 2008 2 EFNUDAT: network of European Facilities for Nuclear Data Measurements CENBG Bordeaux (coord.) France IPNO Orsay France JRC/IRMM Geel European Commission IKI Budapest Hungary FZK Karlsruhe Germany FZD Rossendorf Germany PTB Braunschweig Germany UU-TSL Uppsala Sweden CEA/DAM Bruyères-le-Châtel France CERN/ n_TOF Geneva Switzerland NPI Ř ež Czech Republic slides borrowed from recent EFNUDAT workshop at FZD

Minor actinides neutron-induced fission cross sections G. Kessedjian 1 , B. Jurado 1 , M. Aiche 1 , G. Barreau 1 , A. Bidaud 1 , S. Czajkowski 1 , D. Dassié 1 , B. Haas 1 , L. Mathieu 1 , B. Osmanov 1 , L. Audouin 2 , N. Capellán 2 , L. Tassan-Got 2 , J. N. Wilson 2 , E. Berthoumieux 3 , F. Gunsing 3 , Ch. Theisen 3 , O. Serot 4 , E. Bauge 5 , I. Ahmad 6 , J.P. Greene 6 , R.V.F. Janssens 6 , F.-J. Hambsch 7 , S. Oberstedt 7 , I. AlMahamid 8 1 CEN Bordeaux Gradignan, France 2 IPN Orsay, France 3 CEA Saclay, France 4 CEA Cadarache, France 5 CEA, Bruyères-le-Châtel, France 6 Argonne National Lab., U.S.A . 7 IRMM, Belgium 8 Laboratory of Inorganic and Nuclear Chemistry, USA

Experimental set-up IRMM(Geel,NUDAME) & AIFIRA (CENBG) Solar cells n p 243 Am Polypropylene Si Telescope (C 3 H 6 )n Neutron detector

Results 243 Am(n,f) 3,0 2,5 2,0 σ (n,f)(b) ♦ (n,f) (b) 1,5 Knitter et al (b) Laptev et al (b) 1,0 B,I,Fursov+ JENDL-3.3 0,5 ENDF/B-VI CENBG 0,0 0,0 2,0 4,0 6,0 8,0 10,0 12,0 En (MeV)

Cm and Am fission cross sections via 3 He-induced Cm and Am fission cross sections via 3 He-induced reactions reactions 3 He 3 He T 1/2 =432a T 1/2 =432a ( 3 He, α ) ( 3 He, α ) T 1/2 =7380a T 1/2 =7380a 242 Am 242 Am 243 Am 243 Am 243 Am 241 Am 241 Am +n +n ( 3 He,t) ( 3 He,t) ( 3 He,d) ( 3 He,d) T 1/2 =162d T 1/2 =162d T 1/2 =29a T 1/2 =29a 244 Cm 244 Cm 242 Cm 242 Cm 243 Cm 243 Cm +n +n +n +n

Experimental set-up at IPN Orsay Experimental set-up at IPN Orsay Fission Fission Detectors Detectors Fission Fragment Fission Fragment 3 He (24 & 30 MeV) 3 He (24 & 30 MeV) 243 Am-target 243 Am-target (x= p,d,t, α ) (x= p,d,t, α ) Δ E Δ E E E Si Telescopes Si Telescopes

Preliminary Results! 243 Am( 3 He, α ) 242 Am 243 Am( 3 He, α ) 242 Am 243 Am( 3 He,t) 243 Cm 243 Am( 3 He,t) 243 Cm 243 Am( 3 He,t) 243 Cm 242 Cm(n,f) 242 Cm(n,f) 242 Cm(n,f) 241 Am(n,f) 241 Am(n,f)

Preliminary Results! Preliminary Results! 243 Cm(n,f) 243 Cm(n,f) 243 Am( 3 He,d) 244 Cm 243 Am( 3 He,d) 244 Cm

σ (n, γ ) du 233 Pa σ (n, γ ) du 233 Pa 3 He+ 232 Th → ( 234 Pa)*+p 3 He+ 232 Th → ( 234 Pa)*+p σ γ [b] σ γ [b] 2,5 2,5 2,5 Model Model Petit et al. Petit et al. Petit et al. endf 6.8 endf 6.8 endf 6.8 ) ) ) jendl 3.3 jendl 3.3 jendl 3.3 2,0 2,0 2,0 nos résultats nos résultats nos résultats 1,5 1,5 1,5 1,0 1,0 1,0 0,5 0,5 0,5 0,0 0,0 0,0 0,0 0,0 0,0 0,2 0,2 0,2 0,4 0,4 0,4 0,6 0,6 0,6 0,8 0,8 0,8 1,0 1,0 1,0 E n [MeV] E n [MeV] S. Boyer, PhD Thesis, Université Bordeaux (2004) S. Boyer, PhD Thesis, Université Bordeaux (2004)

ongoing exp. activities 1 P. Rullhusen WPEC JAEA 4-6 June 2008 � Total and Capture cross-sections: � fission: � 197 Au capture � 231 Pa(n,f) � 235 U(n,f), prompt n spectra (with INFN, EFNUDAT, IAEA-CRP) � 209 Bi branching ratio (with IKI, CEA) � 239 Pu(n,f) prompt n multiplicities � 241 Am tot, capt, (n,2n) (with ITU, CEA) � 236 U(n,f), 245 Cm(n,f) (Univ. Gent) � Cd (with IAEA, INFN) � shape isomers � 176,177,178,179 Hf in 235 U, 239 U (with Univ. Örebro) � ternary fission (with INRNE, Univ. Birmingham) � 103 Rh, 133 Cs, 155 Gd (with ORNL) in 244 Cm(s.f.), 250 Cf(s.f.), 251 Cf(n,f) � 55 Mn (with ORNL, IAEA-CRP) (Univ. Gent) � (n, α ) cross sections: � nat,96 Zr, 182,184 W (with INFN, IAEA-CRP) � (n,n’ γ ) , (n,xn γ ): � 10 B(n, α ) 7 Li x-sects. at GELINA � 16 O(n, α ) 13 C � 52 Cr, 206 Pb, Fe, Si � 235 U(n,2n γ ) (Univ. Strasbourg) � Activation: � (n,n): � W, Ta, Zr, Hf � D, Fe � technical developments: � NRCA, NRTA: NEPTUNE, N(d,n), TPC, imaging (ANCIENT CHARM, CHI3) VERDI, GAINS, GENDARC

241 Am(n,2n) 2 P. Rullhusen WPEC JAEA 4-6 June 2008

241 Am σ tot 3 P. Rullhusen WPEC JAEA 4-6 June 2008 On-going analysis : fitting with Dopush option (Doppler : harmonic crystal model, using a Np phonon spectrum)

56 Fe(n,n’ γ ) 4 P. Rullhusen WPEC JAEA 4-6 June 2008 Total inelastic cross section 2 consistency check: JEFF 3.1 IRMM - 2007 gamma production cross section σ (barn) for the strongest transition 1 LAS, USA., 2004 0 ORL, USA, 1991 2 IRMM (4mm sample) 0 4000 8000 12000 16000 IRMM (1mm sample) E n (keV) IRMM (3mm sample) σ (barn) 2 JEFF 3.1 IRMM - 2007 1 σ (barn) 1 0 0 4000 8000 12000 16000 E n (keV) 0 1000 2000 3000 4000 E n (keV)

10 B(n, α ) setup at GELINA 5 P. Rullhusen WPEC JAEA 4-6 June 2008 Measurements up to 3 MeV for branching ratios, angular distributions and cross sections 235 U 235 U 10 B 10 B 10 B 10 B 235 U 235 U Multi-plate IC with two thin B and two 235 U samples, in pairs back to back 16 input signals from the IC Low noise and temperature stabilized environment Data acquisition and analysis still ongoing

16 O(n, α 0 ) 13 C data, status 2007 6 P. Rullhusen WPEC JAEA 4-6 June 2008 IRMM data: PRELIMINARY !!! 16 O(n, α 0 ) 13 C 0.30 Giorginis, Khryachkov, Corcalciuc, Kievets ENDF/B-VI.8 (2001) Neutron source 2007 Neutron source 2006 ENDF/B-VII.0 (2006) 3 He 3 He reaction: T(p,n) reaction: D(d,n) ENDF/B-VII.NEW (2007) 2 0.25 target: TiT, 214 μ g/cm target: gas D, 20 kPa = ENDF/B-VII.0* 1.0 target window: 5 μ m Mo target backing: Ag IRMM ExpData (2006) IRMM ExpData (2007) 0.20 Cross section (b) 0.15 0.10 0.05 0.00 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 Neutron energy (MeV) Fig. 1 High resolution T(p,n) data below 4.4 MeV (red points). Problem: high background-to-signal ratio in the 238 U neutron monitor due to the silver backing of the TiT target. Rough correction estimation for background included. Low resolution D(d,n) data in the range of the 5.05 MeV resonance (black points).

16 O(n, α 0 ) 13 C 7 P. Rullhusen WPEC JAEA 4-6 June 2008 comparison to ENDF/B-VII.0 0.32 IRMM data: PRELIMINARY !!! 16 O(n, α 0 ) 13 C Giorginis, Khryachkov, Corcalciuc, Kievets ENDF/B-VI.8 (2001) 0.28 ENDF/B-VII.0 (2006) Neutron source 2006 Neutron source 2008 ENDF/B-VII.NEW (2008) 3 He 3 He reaction: D(d,n) reaction: T(p,n) = ENDF/B-VII.0* 1.171 target: gas D, 20 kPa target: TiT, 1941 μ g/cm 2 IRMM ExpData (2006Jul) 0.24 target window: 5 μ m Mo target backing: Ag IRMM ExpData (2008Apr) Cross Section (b) 0.20 0.16 0.12 0.08 0.04 0.00 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 Neutron Energy (MeV) Low resolution T(p,n) data below 5.2 MeV (red points) Agreement with the low resolution D(d,n) data in the range of the 5.05 MeV resonance (black points) The ENDF/B-VII.0 (magenta) and ENDF/B-VII.0 corrected upwards by 17% (green)

16 O(n, α 0 ) 13 C 8 P. Rullhusen WPEC JAEA 4-6 June 2008 status May 2008 0.24 IRMM data: PRELIMINARY !!! 16 O(n, α 0 ) 13 C Giorginis, Khryachkov, Corcalciuc, Kievets Convolution: ENDF/B-VII.0 with ΔΕ Convolution* 1.171 0.20 IRMM ExpData (2008Apr) Neutron source 2008 0.16 3 He Cross Section (b) reaction: T(p,n) target: TiT, 1941 μ g/cm 2 target backing: Ag 0.12 0.08 0.04 0.00 3.7 3.8 3.9 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9 5.0 5.1 5.2 5.3 5.4 5.5 Neutron Energy (MeV) Low resolution T(p,n) data below 5.2 MeV (red points) Convolution of ENDF/B-VII.0 with the energy resolution function (magenta) Convolution adjusted in height to fit to the IRMM data (green).

235 U(n,f), 239 Pu(n,f) 9 P. Rullhusen WPEC JAEA 4-6 June 2008 prompt neutron emission in resonances Array of 8 DEMON neutron detectors (on loan) Double Frisch grid ionisation chamber Combined digital and analogue signal acquisition Digital signal processing GELINA ToF 10m station Ongoing activity Tests with 252 Cf(SF)

235 U(n,f) 10 P. Rullhusen WPEC JAEA 4-6 June 2008 prompt neutron emission in resonances 8 8000 235U ( nres,f ) 235U(nres,f) 15 μ sec threshold 6 6000 YIELD [%] Counts 4 4000 2 2000 0 0 70 80 90 100 110 120 130 140 150 160 170 0 1000 2000 3000 MASS [amu] TOF [arbitrary]

235 U(n,f) n spectrum 11 P. Rullhusen WPEC JAEA 4-6 June 2008 235 U Spectrum shape - all measurements 1.2 1.1 R(E), <E>=2.002MeV 1.0 Jan08-R90 Jan08-L90 Jan08-R150 0.9 Apr07-R90 Apr07-L120 Apr07-R150 0.8 Jul06-R90 Jul06-L120 ENDF/B-VII 0.7 0 2 4 6 8 10 E, MeV

235 U(n,f) n spectrum 12 P. Rullhusen WPEC JAEA 4-6 June 2008 Three-source model 90-deg 1,6 SCN, α=0.4 1,4 LA(A+1) LA(A) R(E), <E>=2.004MeV 1,2 total 1,0 0,8 0,6 0,4 0,2 0,0 0 2 4 6 8 10 12 E, MeV LA shape is due to inverse x-section dependence in optical model calculation