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Los Alamos National Laboratory

239Pu – PFNS & PFGS

Patrick Talou

Los Alamos, April 11, 2016

Los Alamos National Laboratory

3/24/16 | 2

Prompt Fission Neutron Multiplicity

•  CIELO file: •  Thermal value + RRR below 650 eV adopted from SG34 •  “untweaked” nu-bar from covariance analysis between 0.1 and 1.2 MeV

0.7

0.75

0.8

Rat

io 23

9 Pu th

erm

al <ν p

> / 25

2 Cf (

sf) <ν p

>

Hop

kins

, 196

3

Mat

her,

1964

Volo

din,

197

2

Bold

eman

, 198

0

Gw

in, 1

984

Stan

dard

s,20

07

Hol

den

and

Zuke

r, 19

88

END

F/B-

VII.1

JEN

DL-

4.0

JEFF

-3.1

WPE

C-S

G34

Los Alamos National Laboratory

3/24/16 | 3

Fluctuations in the Resonance Region

Los Alamos National Laboratory

3/24/16 | 4

“Untweaked” nu-bar in the fast range

Los Alamos National Laboratory

3/24/16 | 5

Prompt Fission Neutron Spectrum •  New evaluation up to 20 MeV, Neudecker •  CIELO file: no changes below 5 MeV for now; adopt

evaluation above 5 MeV? Test w/ LLNL pulsed sphere •  Wait for Chi-Nu data

Los Alamos National Laboratory

3/24/16 | 6

Prompt Fission Gamma Rays

Los Alamos National Laboratory

3/24/16 | 7

CGMF calculations up to 20 MeV

•  Some inconsistencies between neutron and gamma data to revisit

Los Alamos National Laboratory

3/24/16 | 8

Time-dependence of γ-ray multiplicity and energy