activity report of the nuclear data group at centro ...centro atomico bariloche argentina wpec sg-42...

ACTIVITY REPORT OF THENUCLEAR DATA GROUP

AT CENTRO ATOMICO BARILOCHE, ARGENTINA

Jose Ignacio Marquez DamianFlorencia CantargiChristian Helman

Jose Rolando Granada

Neutron Physics DepartmentCentro Atomico Bariloche

Argentina

WPEC SG-42 third meetingMay 16th-18th, 2017OECD, Paris, France

J.I. MARQUEZ DAMIAN, F. CANTARGI, C. HELMAN, J.R. GRANADA CAB ACTIVITY REPORT WPEC SG-42 1 / 22

WHO WE ARE: THERMAL SCATTERING NUCLEAR DATA GROUP ATCENTRO ATOMICO BARILOCHE

Rolando Granada Florencia Cantargi Christian Helman Ignacio MarquezScattering theory

and advancedneutron sources

Cold moderatormaterials andneutron filters

Solid state physicsand ab initio

methods

Nuclear reactorapplications andbenchmarking

Past members: Monica Sbaffoni (currently at IAEA), Victor Gillette (currently atUniversity of Sharjah, U.A.E).


WHAT WE DO

LD2

H2O

H2O

D2O

CH2

PMMA

TBP

Dodecane

Mesitylene (l)

LH2

Mesitylene (s)

Mesitylene (s)

Clathrate

Ice

Ice

Ice

Mesitylene (s)

Mesitylene (s)

D2O

SD2

Mesitylene (s)

CH4 (s)

CH4 (l)

Mesi / Toluene

Silicon(monocrystalline)

Silicon(polycrystalline)

Silicon(monocrystalline)

Silicon(polycrystalline)

Sapphire

Bismuth

SiO2

H2O


ACTIVITY REPORT

1. Development of new scattering kernels.

2. Collaboration with NEA - JEFF.

3. Collaboration with CSEWG - ENDF/B.

4. Activities in support of LAHN Project.

5. Other R&D activities and collaborations.


1A) DEVELOPMENT OF NEW SCATTERING KERNELS: LIQUID ETHANE

Liquid ethane has been proposed by Dr. Granada as an interesting replacementfor liquid methane as an intermediate energy “cool” neutron moderator:

Wide temperature range as a liquid (90 - 184 K).Important protonic density (higher than liquid methane).Presence of low energy CH3 rotational modes.

Development continues this year with transmission measurements at Vesubio(ISIS - UK).



1E-3 0.01 0.1 1

1E-6

1E-5

1E-4

(E

)

E (eV)

Water 293KMethane 22KMethane 100K

Thermal

Cold

Cool



80 100 120 140 160 180

6

7

8

9

ls

s

s-MESITYLENE

WATER-RT

METHANE

Pro

ton

Den

sity

(10

22at

/cm

3 )

T (K)http://www.engineeringtoolbox.com/ethane-thermal-properties-d_1761.html

ETHANE

o

os

l


1B) DEVELOPMENT OF NEW SCATTERING KERNELS: LIQUID HYDROGENAND DEUTERIUM

The COLDH subroutine in LEAPR applies the Young-Koppel model for quantumrotators to hydrogen and deuterium.

The subroutine applies a Vineyard correction to the translational motion of themolecule. This is incorrect, and was corrected by Granada and Gillette in 2004.

The current model is an update of the model by Granada and Gillette, using theSkold approximation for the coherent correction and updating the frequencyspectra and structure factors.

New evaluations available for 14 -20 K (ortho/para H2) and 19-23 K (ortho/paraD2).



1×10-4

1×10-2

1×100

1×102

Energy [eV]

1

10

100S

ca

tte

rin

g C

ross S

ectio

n [

b]

CelliGrammerENDF/B-VII (20 K)

New CAB Evaluation (19 K)

Seiffer (- 0.5% ortho H)



1×10-4

1×10-2

1×100

Energy [eV]

10

100

1000S

ca

tte

rin

g C

ross S

ectio

n [

b]

Seiffert (normal H)

New CAB evaluation (19 K)

ENDF/B-VII (20 K)



1×10-5

1×10-4

1×10-3

1×10-2

1×10-1

1×100

1×101

Energy [eV]

10

20S

ca

tte

rin

g C

ross S

ectio

n p

er

D2 m

ole

cu

le [

b]

PSI (low energy)

PSISeiffertNew CAB EvaluationENDF/B-VII evaluation



Code is available as a development branch of NJOYin our repository at Github:

https://github.com/marquezj/NJOY2016/tree/H2D2

Combining the options ncold and nsk, different models can be used:

ncold nsk model

1/2/3/4 0 ENDF/B-VI models1/2/3/4 1 Granada model (2004)1/2/3/4 2 Granada model (2017)

The code also allows to change smin as an input parameter.


https://github.com/marquezj/NJOY2016/tree/H2D2

2) COLLABORATION WITH NEA - JEFF

Collaboration NEA to provide scattering kernels to JEFF:Thermal moderators: light water, heavy water.Cold moderators: light water ice, mesitylene, tolune, methane, liquid hydrogen, liquiddeuterium.Neutron filters: silicon, sapphire.

Nuclear data users from the advanced neutron sources community (many inEurope) will be benefited.

JEFF will become the most complete evaluated data library for neutron scatteringapplications

(see talk by Florencia Cantargi at 15:30)


3) COLLABORATION WITH CSEWG - ENDF/B

Participation in CSEWG in support of ENDF/B, in collaboration with Danila Roubtsovfrom Canadian Nuclear Laboratories:

Continued support for light and heavy water libraries: extrapolation to 650 and800 K (light water) and 650 K (heavy water).

Coordination of TSL section in the ”big paper”.

Collaboration with BNL on QA of TSL libraries: standarization of basic TSLchecks.


4) ACTIVITIES IN SUPPORT OF LAHN PROJECT.

LAHN (Laboratorio Argentino de Haces de Neutrones) is a project for thescientific utilization of neutron beams at the future RA-10 reactor.

RA-10 is a 30 MW experimental reactor being built at Centro Atomico Ezeiza,Argentina.

First concrete poured on May 6th, expected to become critical in 2019.

The Nuclear Data Group is supporting this project by providing shielding andbeam shielding calculations, and helping with education and training.


5) OTHER R&D ACTIVITIES AND COLLABORATIONS

Ab initio calculations: beryllium and uranium dioxide.

Development of LEAPR/NJOY: contributions will be made available online.

Collaboration with CCHEN (Chile): calculation of delayed neutron fraction andeffective delayed neutron fraction.

Collaboration with PSI (Switzerland): transmission experiments in cold water /ice.

Participation in UCANS / ICANS.

IAEA CRP on Advanced Moderators for Intense Cold Neutron Beams in MaterialsResearch.


5) COLLABORATION WITH PSI.

0 2 4 6 8 10Wavelength [A]

0

50

100

150

200

250To

tal c

ross

sec

tion

per H

2O m

olec

ule

[b]

Ice (-2 °C)Liquid Water (6 °C)Supercooled water (-2 °C)Room temp (20 °C)

PRELIMINARYDATA

Comparison of preliminary ice and water transmission data with TSL models. Datawas measured by Pierre Boilat and Muriel Siegwart from PSI at the test beamline of

BER II reactor.


THANKS FOR YOUR TIME.QUESTIONS?

PATAGONIA, ARGENTINA

activity report of the nuclear data group at centro ...centro atomico bariloche argentina wpec sg-42...

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