Fission c k chamber Detectors Sample t o r f o f n l - - PowerPoint PPT Presentation

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Inelastic scattering N NEMEA-6, Krakow, October 2010 filters shielding dep U90Mo10 neutron beam E p l i e collimation c Fission c k chamber Detectors Sample t o r f o f n l Digitizer external trigger i Acqiris

SLIDE 1

‹Nº› NEMEA-6, Krakow, October 2010

Inelastic scattering

depU90Mo10

E l e c t r

l i n a c collimation filters shielding

neutron beam

Fission chamber Sample Detectors Digitizer Acqiris DC440

p i c k

f external trigger signal

Neutron time-of-flight with digital processing

SLIDE 2

‹Nº› NEMEA-6, Krakow, October 2010

Inelastic scattering GAINS @ FP3/200m GELINA

SLIDE 3

‹Nº› NEMEA-6, Krakow, October 2010

Inelastic scattering

) ( 2 ) ( 2

2 1 1 1 i i i

x d d w dx x d d

)) (cos( 4 ) ( 4 ) (

2 2

max

k k k kP

c W d d

) cos(

i i

x

1=110o, 70o 

w1=1.304

2=150o, 30o

 w2=1.696

Exact angle integration 1 L 3

Method is insensitive to finite detector and sample size (Monte Carlo simulations)

SLIDE 4

‹Nº› NEMEA-6, Krakow, October 2010

Inelastic scattering

Neutron fluence monitoring: 235U fission chamber

1000 2000 3000 10 20 30

YA Y

a*(ch)+b

ADC

ffset

plateau C counts channel 15 MeV foreground raw corrected for YA

Revisiting of the fluence measurement

Mass verified by alpha-counting
Study of efficiency
Control measurement at PTB

(intercomparison)

8.4 MeV 15 MeV

SLIDE 5

‹Nº› NEMEA-6, Krakow, October 2010

500 1000 1500 2000 2500 50000 100000 150000

counts Energy (keV)

23Na spectrum

detector 10, 110

440 keV

Data, results

SLIDE 6

‹Nº› NEMEA-6, Krakow, October 2010

Data, results

SLIDE 7

‹Nº› NEMEA-6, Krakow, October 2010

23Na Sample

Metallic sodium sample prepared by André Moens at IRMM

SLIDE 8

‹Nº› NEMEA-6, Krakow, October 2010

Present situation

Flux normalization issue is settled 50 % of the data for Na-23 are analysed Data taking for Zr is ongoing (until end of year) Data taking for Mo is scheduled for January- February 2011