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1 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section www-nds.iaea.org NUCLEAR.

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Presentation on theme: "1 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section www-nds.iaea.org NUCLEAR."— Presentation transcript:

1 1 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org NUCLEAR DATA EVALUATION NEEDS: Impact of n_TOF measurements on nuclear applications Roberto Capote and Naohiko Otsuka Nuclear Data Section International Atomic Energy Agency

2 2 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org OUTLINE  Nuclear data evaluation in a nutshell  Overview of n_TOF results and their impact  Summary and outlook

3 3 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Nuclear Data Evaluation From D. Neudecker, S. Gundacker, H. Leeb et al., ND2010, Jeju Isl., Korea

4 4 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Definition of (ND) Evaluation A properly weighted combination (usually by GLSQ fit) of selected experimental data (and nuclear reaction modelling results). Bayesian approaches:  “Non-model” GLSQ fit: neutron standards (STD) IAEA STDs: https://www-nds.iaea.org/standards/https://www-nds.iaea.org/standards/  R-matrix (non-model fit) – RR evaluations  Model prior + GLSQ fit Experimental nuclear physicists Theoreticians and reaction modellers Evaluators

5 5 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Neutron standards: Files include additional energy range beyond STD !! ENDF/B-VII.1 almost = STD JEFF-3.2  IAEA STD JENDL-4.0  IAEA STD www-nds.iaea.org/standards/ Nuclear Data Sheets 110 (2009) 3215-3324

6 6 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Evaluated 238 U(n,f) vs. IAEA STD cross section

7 7 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Evaluated 238 U(n,f) vs. IAEA STD cross section raw EXFOR ratio data U8/U5, U5 std

8 8 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Nuclear reaction data evaluation  Resonance energy range (  << D)  Fast neutron range (  >> D stat models) keV for actinide, MeV for Ni, Fe, Cr,…  Unresolved resonance range (in between) (self-shielding)

9 9 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Evaluation – resonance range (RR)  Theoretical predictions not possible yet  Resonance parameters must be obtained from fitting ALL AVAILABLE experimental data  Modern resonance fitting codes produce “best fit” parameters as well as their covariances (e.g. SAMMY, REFIT, CONRAD, etc.)

10 10 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Evaluation – resonance range - example

11 11 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org Depends on resolution function RPs, background, … To be combined with transmission...

12 12 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org n_TOF data in EXFOR & impact on applications

13 13 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org A very optimistic point of view… Data published & at EXFOR extracted from Lederer’s pres.

14 14 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org What do engineers need? I need cross sections … Usually evaluated cross sections from ENDF-B,JEFF,JENDL,… Back to the real world

15 15 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org What n_TOF collaboration usually provided? Here you are … It is all described in my article in the Phys.Rev. C ! Or even worse … Please use my Resonance Parameters Impossible to evaluate data in the RR !!! 

16 16 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org n_TOF Published Fission Data in EXFOR (www-nds.iaea.org/nrdc/n_tof) Target1 st authorReferenceEXFORRP<σ><σ>σ*σ*Y PbnatD. TarrioPRC83(2011)044620231515,8,X-- 209Bi5,8,X-- 233UM. CalvianiPRC80(2009)04460414257XX F. BelloniEPJA47(2011)2231285,X 234UC. ParadelaPRC82(2010)03460123126XX D. KaradimosPRC89(2014)04460623231 236UR. SarmentoPRC84(2011)04461823131XX 237NpC. ParadelaPRC82(2010)03460123126X5,X 241AmF. BelloniEPJA49(2013)2231485,X 243AmF. BelloniEPJA47(2011)160231485,X 245CmM. CalvianiPRC85(2012)03461623168X U5/U8C. ParadelaPRC91(2015)024602in comp.X-- * 5: ratio to 235U(n,f) cross section; 8: ratio to 238U(n,f) cross section

17 17 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org P.M. Milazzo et al, AIP 1265 (2010) 477 How evaluators can improve evaluations with no data? 233 U(n,f)

18 18 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org n_TOF Published Capture Data in EXFOR (1/4) (http://www-nds.iaea.org/nrdc/n_tof) http://www-nds.iaea.org/nrdc/n_tof #Target1 st authorReferenceEXFORRPMACS<σ><σ>σY 124MgC. MassimiPRC85(2012)04461523163XX 225MgXX 326MgXX 458NiP. ŽugecPRC89(2014)01460523210XXXX 562NiC. LedererPRC89(2014)02581023195XX 663NiXXX 790ZrG. TaglientePRC77(2008)03580222978XX 8PRC87(2013)01462223194X 991ZrPRC78(2008)04580423044XX 10PRC87(2013)01462223194X 1192ZrPRC81(2010)05580123117XX 12PRC87(2013)01462223194X MACS – astrophysics, Yield (Y) – nuclear energy

19 19 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org n_TOF Published Capture Data in EXFOR (2/4) (http://www-nds.iaea.org/nrdc/n_tof) http://www-nds.iaea.org/nrdc/n_tof #Target1 st authorReferenceEXFORRPMACS<σ><σ>σY 1393ZrG. TaglientePRC87(2013)01462223194XX 1494ZrPRC84(2011)01580122978XX 15PRC87(2013)01462223194X 1696ZrPRC84(2011)05580222978XX 17PRC87(2013)01462223194X 18139LaR. TerlizziPRC75(2007)03580722930XX 19151SmS. MarronePRC73(2006)03460422893XXX 20 186OsM. MosconiPRC82(2010)01580222796XX 21 K. FujiiPRC82(2010)01580423027X 22 187OsM. MosconiPRC82(2010)01580222796XX 23 K. FujiiPRC82(2010)01580423027X 24 139LaR. TerlizziPRC75(2007)03580722930XX MACS – astrophysics, Yield (Y) – nuclear energy

20 20 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org n_TOF Published Capture Data in EXFOR (3/4) (http://www-nds.iaea.org/nrdc/n_tof) http://www-nds.iaea.org/nrdc/n_tof #Target1 st authorReferenceEXFORRPMACS<σ><σ>σY 25188OsM. MosconiPRC82(2010)01580222796XX 26K. FujiiPRC82(2010)01580423027X 27197AuC. MassimiPRC81(2010)04461623067X 28C. LedererPRC83(2011)03460823152XXX 29204PbC. Domingo-PRC75(2007)01580622945XXX 30206PbPRC76(2007)04580522984XX 31207PbPRC74(2006)05580222946XX 32 209BiPRC74(2006)02580722944XX 33 232ThG. AertsPRC73(2006)05461022931X* 34 F. GunsingPRC85(2012)06460123167X 35 237NpC. GuerreroPRC85(2012)04461623069XX 36 241AmK. FravalPRC89(2014)04460923237X MACS – astrophysics, Yield (Y) – nuclear energy

21 21 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org n_TOF Published Capture Data in EXFOR (4/4) (http://www-nds.iaea.org/nrdc/n_tof) http://www-nds.iaea.org/nrdc/n_tof #Target1 st authorReferenceEXFORRPMACS<σ><σ>σY 37243AmE. MendozaPRC90(2014)03460823254*XXXX MACS – astrophysics, Yield (Y) – nuclear energy * in compilation Suggestions:  No need to compile into EXFOR by n_TOF !  No need to centralize submission (data lost?)  First author should submit (as approved by PC): 1) the paper (to the journal) 2) the yield and other data to the IAEA

22 22 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org https://www-nds.iaea.org/exfor/x4send.htm How to submit the data to the IAEA? Complicated??

23 23 n_TOF data-analysis workshop CERN, Geneva, 25-27 February 2015 Roberto Capote, IAEA Nuclear Data Section r.capotenoy@iaea.org www-nds.iaea.org TAKE HOME MESSAGE  Job is not finished till ALL data are submitted Recommendation: submit the yield to the IAEA with the paper to the journal Both for capture and fission experiments:  Capture/Fission yields (= input for SAMMY)  Cross sections (preferably what is measured = ratio to STD) Only exception: (n,f) or (ng) data above the Resonance Range (in this case only cross sections are needed)  n_TOF impact on (n,g) evaluations low  (02/15) Only 232 Th(n,g) capture yield used in IAEA (other) evaluation so far (adopted by..) !!! Situation is improving (2 new sets) but huge backlog needs to be sorted out  n_TOF provided excellent data on U5f/U8f to the IAEA STD group Ratios of other STD cross sections needed – e.g. Au(n,g)/U8(n,g),Li6t/10Ba

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