Outlook. Motivation How to overcome experimental difficulties for Actinides σ(n,γ) ( 3 He,pγ) as a surrogate :
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1 M. iche G. Boutoux B. urado G. Barreau N. Capella I. Compais S. Czajkowski D. Dassie B. Haas L. Mathieu. Bauge 2.M. Daugas 2 T. Faul 2 L. Gaudefroy 2 V. Meot 2 P. Morel 2 N. Pillet 2 O. Roig 2. Taieb 2 O. Serot 3 F. Gusig 4 L. Tassa-Got 5.T. Burke 6 ad X. Derkx 7. CNBG Chemi du Solarium B.P Gradiga Frace 2 C DPT/SPN F-9297 rpajo Frace 3 C-Cadarache DN/DR/SPRC/LPh 308 Sait Paul lez Durace Frace 4 C Saclay DSM/IRFU/SPhN 99 Gif-sur-Yvette cedex Frace 5 Istitut de Physique Nucléaire 5 rue Georges Clemeceau 9406 ORSY Frace 6 LLN US Departmet of ergy Livermore Califoria 9455 US. 7 GNIL Bld Heri Becquerel B.P CN Cedex 05 Frace 8 Horia Hulubei NIPN P. O. Box MG Bucharest-Magurele Romaia CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009
2 Outlook Motivatio How to overcome experimetal difficulties for ctiides σ 3 Hep as a surrogate : Summary Pa measuremet - 75 Lu measuremet CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 2
3 Cross sectio measuremets of short-lived uclei are they importat? Reactor desigs & waste maagemet Trasmutatio of Mior ctiides produced i U/Pu cycle I trasmutatio the itetio is to covert the Ms ito fissio products. Nuclear data eeds for Thorium/Uraium fuel cycle iovative fuel cycle for GN IV reactors Uder eutro flux the heavy uclei primarily udergo σ σf Productio of heavier uclei fissio products CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 3
4 245 Cm Spotaeus fissio 8500 y α decay 244 Cm β - decay 242mCm 63 d 243 Cm 29. y 8.y 244mm capture 242 m 243 m y 0 h Z 24 m 432 y 4.96 h 24 Pu 242mPu y 243 Pu 4.96 h N 239 Pu y 240 Pu y 239 Np 2.35 d 238 U y 4.35 y Mior ctiides Waste i a 239 U U/Pu spet fuel 23.4 m Huge radio toxicities: strog eutro ad alpha emitters e. g bq/µg for 242 Cm 242 Cm σ Difficult to produce ad hadle mior actiides targets T /2 63 d CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may
5 Motivatio How to overcome experimetal difficulties for ctiides σ 3 Hep as a surrogate : Summary Pa measuremet - 75 Lu measuremet CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 5
6 CNRS/IN2P3/CNBG M. ïche CNR*09 Bordeaux 5-8 october 2009 Neutro-iduced reactio alterative solutio exists : trasfer reactios + b Y + a Surrogate reactio Measured 6 a + X H.C. Britt et al. Los lamos 970!! Y X gs b + X* B * P * α σ σ σ P P CN CN wig-weisskopf limit : + + α σ σ CN P P P are quite similar i eutro-iduced ad surrogate reactio α P P + α + CN P σ + Microscopic optical model calculatio BIII TLYS t N X σ φ + X* + X* CNRS/IN2P3/CNBG M. ïche FNUDT Paris may
7 Motivatio How to overcome experimetal difficulties for ctiides σ 3 Hep as a surrogate : Summary 234 Pa measuremet - 75 Lu measuremet CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 7
8 capture cross sectio measuremet -rays decay scheme * c P c N N p p ε i N p- I ±?? ε c ε X ε c Ge detectors m m ε if ε << c i ε i ε i i i 00 % C 6 D 6 detectors ε Suppose R i 2 d respose fuctio t o a give i ε i k i ε c k i ε c d W d R i d m i k i i ad 2 d R i d k * ε i fficiecy ε determied with MCNP simulatios ad validated with a set of -calibratio ad uclear reactios. 2 % 0 CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris MeV c october may
9 σ bars Pa 234 Pa Petit et al. edf 6.8 jedl 3.3 os résultats 232 Th 3 Hepf 234 Pa Ufortuately there is o eutro-iduced data for compariso. 0 Validatio of the Trasfer réactio with existig data Neutro ergie ergy eutro [MeV] MeV 236 U 3 Hep 238 Np 237 Np 236 U 3 He α 235 U 234 U 238 U 3 He t 238 Np 237 Np 238 U 3 He α 237 U 236 U Difficult to produce evaporated actiides targets Validatio of the surrogate method for capture reactios i the rare earth uclei S. Boyer et al. Nucl. Phys CNRS/IN2P3/CNBG N. Wilso et al Nucl. Istr. ad Meth M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 9
10 Motivatio How to overcome experimetal difficulties for ctiides σ 3 Hep as a surrogate : Pa measuremet - 75 Summary 75 Lu measuremet CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 0
11 Theoretical studies 74 Yb 3 Hep 76 Lu as a surrogate reactio 75 Lu 76 Lu Calculatios -solid lie extracted from TLYS code -dotted lie extracted from FRSCO DWB code α + are quite similar i eutro-iduced ad surrogate reactio + P α P Spi distributio of the compoud ucleus 76 Lu for : 00 kev MeV ad 2 MeV CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009
12 New set-up Tadem-Orsay/ 24 MeV / 5e/ Feb 6 Ge 4 C 6 D 6 Scitillators 3 He 2 - θ x6 strips 4 He + 73 Yb 3 He 74 Yb + 3 He Large : 50x50 mm² 3 H + 74 Lu 2 H + 75 Lu H + 76 Lu CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 2
13 C 6 D 6 i coicidece with - P c N N p p ε Normalized to 74 Yb 3 Hep * S 629 MeV 75 Lu* 76 Lu* CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 3
14 Ge i coicidece with - 74 Yb 3 Hep * S 629 MeV 75 Lu* 76 Lu* Ig a m m a f c t * k e V 7 5 L u 7 0 k e V 7 6 L u k e V 7 6 L u Ig S629 MeV * 0 k e V / c a a l CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 4
15 76 Lu 2.9 kev 75 Lu 3.7 kev CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 5
16 α + are they quite similar i eutro-iduced ad surrogate reactio ISOMRIC RTIO Talys Calculatio 8 + : 425 kev t /2 ~ 2 s + : 95 kev t /2 ~ 35 s 3 - : 658 kev t /2 ~ 6.3 s CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 6
17 Summary ad perspectives lterative ad powerful techique to measure σ of short-lived uclei 75 Lu 76 Lu scheduled for C/BIII 4MV Va De graaff facility Proto beam pulse 2 s ad perspectives Ti/T.5 x.5 LaBr3 3% at 660 kev Resol time ~ 200ps 75 Lu 76 Lu ToF: 7.3 MeV - C/BIII 4MV Va Degraaff facility 236 U 3 Hep 238 Np 237 Np 236 U 3 He α 235 U 234 U 238 U 3 He t 238 Np 237 Np 238 U 3 He α 237 U 236 U If oe of these targets is available! CNRS/IN2P3/CNBG M. ïche CNR*09 FNUDT Bordeaux Paris october may2009 7
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