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Nuclear Data Research at LANSCE with Possible Relevance to IFMIF

Robert C. Haight

Los Alamos National Laboratory

IAEA Meeting on Nuclear Data for Advanced Systems – Fusion

October 31 – November 2, 2007

LA-UR-07-7210

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IFMIF has many needs for nuclear data

• IFMIF neutrons– Activation to 50 MeV– Gas production to 50 MeV – e.g. no Molybdenum– Neutron transport in sample environment– Displacements -- e.g. file MT=444

• IFMIF deuterons (and protons??)– Probably lots of data needs: e.g. D+Cu, etc.

• Source reaction – – It is what it is; do we need to know it better

• Imaging of source for beam steering and focusing

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GEANIE (n,x) FIGARO (n,xn+)

N,Z (n,charged particle)

DANCE (n,)

Fission

Nuclear data measurements at LANSCE are made with several instruments

LSDSDouble Frisch-grid fission chamber; also standard fission ion chamber; new detector station for fission and (n,alpha)

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Nuclear data experiments at LANSCE use neutrons at the Lujan Center, Target 2 and Target 4.

Target 490L

15R30R

60R

90R

Target 2

120L

Line B NRAD,Ultra-Cold Neutrons

Proton Radiography

Area A (inactive)

ER-1

Target 1

34

5

867

ER-2

910

11A/B1213

12

1415

16

H+ Source

H- Source

Isotope ProductionFacility (construction)

Drift Tube Linear

Accelerator

Line DSide-Coupled Linear Accelerator

PSR

Lujan Center

15L30L

LSDS

GEANIE

FIGARO

N,Z

DANCE

Proton

Fission;(n,alpha)

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GEANIE (n,x)

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193Ir(n,n')193mIr

0

200

400

600

800

1000

1200

1400

1600

1800

2000

0 2 4 6 8 10 12 14 16 18

En (MeV)

s (m

b)

Crucial Region for Fission Neutrons

Bayhurst 75 - Experiment

GNASH 98 - Evaluation

GEANIE 03 - Experiment+Model

Arthur/Little 79- Evaluation

Hermann 96- Evaluation

New GEANIE data significantly improve the 193Ir(n,n’)193mIr cross section database

GEANIELLNL/LANL

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N,Z double-differential cross sections are studied with “standard” detector telescopes

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We measure hydrogen and helium production cross sections for the Advanced Fuel Cycle Initiative

These data differentiate among evaluations

Contact: Bob Haight

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Helium production data is being measured for several materials for neutron energies up to 100 MeV

Helium productionLANSCE data

0

100

200

300

0 20 40 60 80 100 120

En (MeV)

Cro

ss s

ecti

on

(m

b)

. Chromium

Tantalum

Iron

Molybdenum

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ENDF/B-VII has problems for helium production by neutrons on iron in the 7-13 MeV range

Iron (n,Helium)

0

0.01

0.02

0.03

0.04

0.05

0 2 4 6 8 10 12 14 16 18 20

Neutron Energy (MeV)

Cro

ss S

ecti

on

(b

)

FZK/INPE56Fe

NRG-2003

JENDL-HE56Fe

IEAF-2001

LANSCE data

ENDF/B-VII56Fe

Haight/Kneff + He-accumulation

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Hydrogen production also is being measured

0

200

400

600

800

1000

1200

0 20 40 60 80 100 120

En (MeV)

Cro

ss S

ecti

on

(m

b)

Hydrogen productionLANSCE data Chromium

Tantalum

Iron

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FIGARO (n,xn+)

20 liquid scintillatorneutron detectors

2 gamma-ray detectors

FIGARO – Fast neutron-Induced GAmma-Ray Observer

X

n

13

Gamma-ray detectors near the sample trigger the event for study of neutron emission – needed for neutron transport

FIGARO (n,xn+)

n

x

• 20 Neutron detectors

• En from time of flight ~ 1m

• “Double time-of-flight“ experiment

• Neutron emission in coincidence with gamma rays

sample 22 m from WNR source

58,60Ni(n,n’)

BaF2

HPGe

BaF2

HPGe

A+1Z

AZ + n(target)

E n

2+

4+

0+

(J,E x) n'

Trigger

A+1Z

AZ + n(target)

E n

2+

4+

0+

(J,E x) n'

Trigger

Neutron emission contingent on one specific -transition

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Recapitulate: IFMIF has many needs for nuclear data

• IFMIF neutrons– Activation to 50 MeV – GEANIE relevance– Gas production to 50 MeV – (n,z) – ENDF file incomplete– Neutron transport in sample environment - FIGARO– Displacements -- e.g. file MT=444

• IFMIF deuterons (and protons??)– Probably lots of data needs: e.g. D+Cu, etc.

• Source reaction – – It is what it is; do we need to know it better

• Imaging of source for beam steering and focusing