Experiments NEA member countries

Arjan Plompen

Overview

• JEFF

• KAERI summary (Cho)

• Nuclear data weeks

GEDEPEON November 2011

ANDES April 2012

ERINDA

EUFRAT

Collaboration ORNL (Danon)

Summary of the GEDEPEON-JEFF workshop 28-29 November 2011

G. Kessedjian (CNRS Grenoble)

Heavy Mass and Isotopic yield measurements of 233U(nth,f) on the Lohengrin

spectrometer at ILL

• Mass yields > Ionization chamber • Isotopic yields > g spectrometry • Delayed neutron > b – n detector

Kessedjian, ILL experiments

Jurado, FY at GSI (Taieb et al.)

• PFNS & n

• Expts: LANL, BRC

• Coll.: BRC, LANL, IRMM

Experimental investigations on prompt fission neutrons spectra T. Granier, CEA DAM DIF, Bruyères le Châtel, Arpajon, France

12 days beam 1 mg 238U target

X. Ledoux, delayed neutrons 232Th

Fdet(t)

t(s)

1,E-10

1,E-08

1,E-06

1,E-04

0 2 4 6 8 10

Energy (MeV)

Nb

r o

f fi

ssio

ns (

u. a.)

Th sample

Th sample + detector

Prompt fission gammas

J.-M. Laborie, G. Bélier, J. Taieb, CEA, DAM, DIF

First results

in 252Cf spontaneous fission

in 238U fast neutron-induced fission : 1.7 & 15.6 MeV

• Technical development goes on (BGO det. 2 ns

• First work since 70s!

Prompt fission gammas

J.-M. Laborie, G. Bélier, J. Taieb, CEA, DAM, DIF

First results

in 238U fast neutron-induced fission : 1.7 & 15.6 MeV

0,0 0,5 1,0 1,5 2,0 2,5 3,0 3,5 4,0

10-1

100

101

n(15.6 MeV)+238

U

n(1.7 MeV)+238

U

nth+235U (Verbinski et al.)

Num

ber

of

g per

(fis

sio

n.M

eV

)

g-ray energy (MeV)

Prompt fission gammas • Detector development

• LaBr3:Ce, LaCl3:Ce, Ce:Br3

• Efficiency, resolution, background

• 2x4fold pCVF double-E detector

• TOF FF-g to clean up g-spectrum

235U(nth,f) Budapest

TAGS and Pn, Algora, IFIC-Valencia

A method to determine independent isotopic fission yields utilising a Penning trap has been developed Method has been applied to charged particle induced fission: p+238U, p+232Th, d+238U New location of the IGISOL mass separator laboratory allows using intense proton to produce neutrons and use neutron induced fission to produce neutron rich nuclei, lab under reconstruction

TAGS and Pn, Jyväskylä, Penttilä

Practically all is analysed and published EXFOR: to do (T. Ware/Birmingham) Experimental area Class A new target second campaign started 2009-2012 restart 2014

E. Chiaveri n_TOF developments

n_TOF (*) is a spallation neutron source based on 20 GeV/c protons

from the PS of CERN from

thermal to ~1 GeV neutron energy

Overview of the n_TOF spallation target area

n_TOF target pit

Technical gallery (@10 m from pit)

EAR2 (@20 m from pit, above ground)

Exis

tin

g h

ole

To

be b

uil

t

ISR

JEFF-GEDEPEON Workshop

28/29 November 2011

N_TOF fission, Colonna

n_TOF – Phase 1

235U, 238U, 232Th, 233U, 234U, 236U, 237Np, 241,243Am, 245Cm, 209Bi, natPb

n_TOF – Phase 2

240Pu, 242Pu, 232Th, 237Np

• TRAKULA

• Sample prep.

• Detector devel.

• Fission XS meas.

• AMS, Felsenkeller

• Training

Pillon, diamond detectors spectrometer n+C cross sections

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16

1E-8

1E-7

1E-6

1E-5

1E-4

1E-3

Neutron E

nerg

y (M

eV

)

7.5

20.5

16.5

7.33 MeV

7.83 MeV

20.54 MeV

8.3 MeV

13.79 MeV16.3 MeV

16.93 MeV

17.48 MeV

18.96 MeV18.48 MeV

17.99 MeV

Deposited Energy (MeV)

No

rma

lize

d R

esp

on

se

0.00

0.05

0.10

0.15

0.20

0.25

0.30

6 8 10 12 14 16 18 20 22

Neutron energy (MeV)

Cro

ss-s

ecti

on

(b

arn

)

this paper

CENDL-3.1

EAF-2007

1982,G.Dietze+

1976,A.P.Stevens

1980,P.Dimbylow

U-234(n,f) anisotropy Al-adili, Hambsch, Oberstedt, Pomp

Summary of the ANDES-JEFF workshop 23-24 April 2012

238U(n,n’g) A. Bacquias et al. CNRS-IPHC Strasbourg, JRC-IRMM, CEA/DAM BRC, IFIN-HH

Preliminary

23Na(n,n’g) • Upper limit of energy 3.84 MeV

• Total inelastic and level inelastic

• Careful efficiency check gamma-ray detectors

• Final data delivered to CEA, NRG, BNL, JSI

• Report EUR 24871 EN.

• Group cross section < 2.5 %!

• C. Rouki et al., Nucl. Instrum. Meth. A 672 (2012) 82

En (keV)

Cro

ss s

ecti

on

(b

)

Inelastic versus other data and evaluations

Level cross sections

En (keV)

Cro

ss s

ecti

on

(b

)

Märten/Kopecky IRMM data 1994/1997 8 liq.scint, 8 angles. n-g discrimination n→elastic, g→ inelastic, normalised n→C(n,n)C, g→10B(n,a)

Consistency check EL+INL ≠ TOT !

R-matrix-fit TOT

R-matrix-fit INL

C6D6 Preliminary N_TOF 241Am(n,g), Cano Ott, Gunsing et al.

JEFF-GEDEPEON Workshop

28/29 November 2011

TAC Preliminary

N_TOF 238U(n,g), preliminary Cano Ott, Ware, Gunsing et al.

IRMM 241Am(n,g), nearly final Schillebeeckx, Kopecky, Lampoudis, Gunsing et al.

IRMM 238U(n,g), ongoing Schillebeeckx, Kopecky, Lampoudis, Gunsing et al.

N_TOF 241Am(n,f) N. Colonna et al.

N_TOF 243Am(n,f) N. Colonna et al.

N_TOF 245Cm(n,f) N. Colonna et al.

N_TOF 240,242Pu(n,f) ongoing N. Colonna et al.

IRMM 240,242Pu(n,f) ongoing P. Salvador et al.

242Pu(SF)

240Pu(SF)

IRMM 240,242Pu(n,f) ongoing P. Salvador et al.

242Pu 240Pu

Other experimental results

IRMM Cd RRR S. Kopecky, P. Schillebeeckx

An ENDF-6 compatible evaluation for Cd-isotopes in the RRR • Data

Literature data

Experiments at GELINA

• Spin assignment etc

Experiments at GELINA with natural Cd samples

103

104

105

106

107

10-4

10-3

10-2

10-1

100

101

102

B(t) = Bo + B

g(t) + B

n(t)

Bo

Bg(t)

Bn(t)

Re

sp

on

se

/ (

1/n

s)

Time-of-flight / ns

104

105

106

107

100

101

102

103

104

nat

Cd (0.03 mm)

208

Pb (0.5 mm)

no sample

ambient

Re

sp

on

se

/ (

1/n

s)

Time-of-flight / ns

Transmission

Capture

360 380 400 420 4400.0

0.1

0.2 Exp. ( 2 mm)

This work

JEFF 3.1.3

JENDL 4.0

ENDF/B-VII

Yie

ld

Neutron Energy / eV

1 100.0

0.2

0.4

0.6

Exp. (25 mm)

This work

JEFF 3.1.3

JENDL 4.0

ENDF/B-VII

ENDF/B-VII.1

Tra

nsm

issio

n

Neutron energy / eV

•113Cd Improved resonance parameter from thermal up to 10 keV •Impossible to describe thermal cross section and first resonance

This file puts higher importance on the shape of first resonance (Cd cut-off) than on thermal cross section

•Low abundant isotopes 106,108, 116Cd – quality files adequate •114Cd measurements with enriched sample might give improvement Covariance will be provided by CEA Cadarache

Camarda et al., Phys. Rev. C, Vol. 8 num. 5, 1813-1826 (1973)

• Columbia Univ. Nevis synchrocyclotron

• Measurements on 182W, 184W, 186W enriched samples and natW

• Transmission measurements and Self-indication measurements

Macklin et al., Nucl. Sc. Eng., Vol. 84, 98-119 (1983)

• capture measurements at ORELA

• Measurements on 182W, 184W, 184W, 186W enriched samples

Transmission measurements on natW have been performed at GELINA adjusting the resonance energy and sometimes Gn These preliminary results have shown a lack of reliable resonance parameters for 183W

Tungsten RRR

540 570 600

0.3

0.6

0.9

Tra

nsm

issio

n

Neutron Energy [eV]

Experimental Data

ENDF/B-VII

This work

540 570 600

0.3

0.6

0.9

Tra

nsm

issio

n

Neutron Energy [eV]

Experimental Data

ENDF/B-VII

This work

590 600 610

0.6

0.8

1.0

Tra

nsm

issio

n

Neutron Energy [eV]

Experimental Data

ENDF/B-VII

this work

Tungsten RRR

20 40 60 80 10080

100

120

140 GELINA I

GELINA II

Yamamuro et al.

Kazakov et al.

Macklin et al.

Gwin et al.

Kononov et al.

IAEA

ENDF

(n

,g)

E1

/2/ (b

eV

1/2)

Neutron Energy / keV

Gold URR

0 20000 40000 60000 8000080

100

120

140

160 IAEA eval.

GELINA 12 m

GELINA 30 m

nTOF

(n

,g)

E1/2 )

/ (

barn

eV

1/2)

Neutron Energy / eV

Li(p,n) spectrum at threshold and Au(n,g) semi-MACS Feinberg et al. (IRMM, SOREQ, Hebrew university)

2.06 m gold

degrader

Li(p,n) spectrum at threshold and Au(n,g) semi-MACS Feinberg et al. (IRMM, SOREQ, Hebrew university, accept. PRC)

Ratynski & Käppeler PRC37(1988)595 kT=25: 648(10) mb kT=28: 582( 9) mb

HZDR - nELBE A.R. Junghans et al.

HZDR - nELBE A.R. Junghans et al.

Conclusion

• Considerable amount of ongoing experimental work

• Institutional and national programs

• Supported by national and EC programs (GEDEPEON, TRAKULA, ANDES, ERINDA, EUFRAT)

• KAERI presentation still to come