Nuclear Science with a C LYC Array · Post-docs A.J. Mitchell Gemma Wilson* Chris Morse* Edward Lamere* Faculty Partha Chowdhury (PI)* Kim Lister (co-PI)* Andrew Rogers Peter Bender

Learning with PurposeLearning with Purpose

NuclearSciencewithaC7LYCArray

ParthaChowdhuryUniversityofMassachusettsLowell

WorksupportedbyU.S.DepartmentofEnergy

Learning with Purpose

NNSA-SSAAGrants

Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019

NNSA-SSAAGrant#DE-NA0001988(2013-2016)AVersatileGammaandFastNeutronSpectrometerC.J.Lister(PI),P.Chowdhury(co-PI)Evaluateanewbrightdualn-g scintillator,Cs2LiYCl6,withexcellentpulseshapediscrimination,investigateitsresponsetofastneutrons,andconstructandcharacterizeaSmallCLYCArrayforNeutronSpectroscopy(SCANS)

NNSA-SSAAGrant#DE-NA0002932(2016-2019)NuclearSciencewithaC7LYCArray(SCANS)P.Chowdhury(PI),C.J.Lister(co-PI)Explorethesciencepotentialofa16-element6Li-depleted(C7LYC)arraythroughtargetedmeasurementsinlowenergynuclearsciencerelevanttoStockpileStewardship


ProgressReport2018

ApplicationsofC7LYCscintillatorsinfastneutronspectroscopy,T.Brown,P.Chowdhury,E.Doucet,E.G.Jackson,C.J.Lister,A.J.Mitchell,C.Morse,A.M.Rogers,G.L.Wilson,N.D’Olympia,M.Devlin,N.Fotiades,J.A.Gomez,S.M.Mosby,R.O.Nelson,Nucl.Inst.Meth.Phys.Res.A(2018) (inpress)https://doi.org/10.1016/j.nima.2018.08.082

Machinelearningn/γdiscriminationinCLYCscintillators,E.Doucet,T.Brown,P.Chowdhury,C.J.Lister,C.Morse,P.C.Bender,A.M.Rogers,Nucl.Inst.Meth.Phys.Res.A(2018) (inpress)https://doi.org/10.1016/j.nima.2018.09.036

Identificationofinternalradioactivecontaminantsinelpasolites(CLYC,CLLB,CLLBC)andotherinorganicscintillators,R.S.Woolf,E.A.Wulf,B.F.Phlips,P.Chowdhury,E.Jackson,Nucl.Inst.Meth.Phys.Res.A(2018)(inpress)https://doi.org/10.1016/j.nima.2018.09.063

• 3refereedpublications• 7invitedtalks• 4 posters• 1 M.S.thesis

NationalLabCollaborationsLANL,NRL,NSCL,ANL



UMassLowellCLYC-ers

UndergraduateMichaelD’Eon*JosephDopfer*

GraduateTristanBrown*EmeryDoucet*NathanD’Olympia*EmilyJacksonPatrickCopp

Post-docsA.J.MitchellGemmaWilson*ChrisMorse*EdwardLamere*

FacultyParthaChowdhury(PI)*KimLister(co-PI)*AndrewRogersPeterBender

*receiveddirectsupportfromNNSAgrant



A.J. MitchellPost-doc(2013-15)Currently research

fellow ANU, Canberra

Emily JacksonPh.D. 2015

Post-doc NRL (2015-17), Currently

Scientist at Andrews AFB

Nathan D’OlympiaPh.D. 2014 Currently

Senior Scientist, Passport Systems

Patrick CoppPhD (2018)

DOE SCGSR scholar (2016)

Currently postdoc at

ANL

Tristan BrownBS (2016)

LANL intern(2016)

MS (2018)UML PhD student

Gemma Wilson

Post-doc(2015-17)Currently

post-doc at LSU/ANL

Emery DoucetBS (2016)

NEUP scholar (2015)

UML PhD student

CLYC-ers:UMLgradstudents/postdocs

EdwardLamere

Post-doc(Mar 2018 - present)

Chris Morse

Post-doc(2015-18)Currently postdoc at LBNL posterpresenter2019



dualn-g scintillatorCs2LiYCl6 (CLYC):prehistory

g

g resolutionbetterthanNaI

Pu(Be) source

< 5%

gammas

neutrons

Thermalneutronresponsevia6Li(n,a)t,Q=+4.8MeV

DOE-SBIRindustrygrantwith

RMDInc.


excellentn-g PSD

Fastneutronresponsevia35Cl(n,p)35S,Q=+615keV


• Eliminate6Li(n,a)thermalpeakvia7Li-enrichedC7LYC• Explorefastneutronspectroscopypotential• A16-elementarrayof1”x1”C7LYC(largestcrystalsavailableatthetime)

SCANS :SmallC7LYCArrayforNeutronSpectrocopy

• NuclearsciencewithSCANS(C7LYC)• Larger(3”x3”)crystal(acquireandcharacterize)• Elastic/inelasticneutronscatteringatLosAlamos• Beta-delayedneutronspectroscopyatCARIBU(ANL)andNSCL

• EfficiencyandlowenergymeasurementsatUML


•~10%neutronpulseheightresolution!!• NolongToFarmneeded• closeplacementallowsincreasedgeometricalefficiency


56Fe(n,n’)SCANSatLANSCE

•800MeVpulsedprotonsonWspallationtarget•20mflightpathtoscatteringtarget(Fe)•C7LYCdetectors17cmfromtarget• TOFtodetectorprovidesincidentenergy•PulseheightinC7LYCprovidesscatteredenergy











T.Brown,P.Chowdhury,E.Doucet,E.G.Jackson,C.J.Lister,A.J.Mitchell,C.Morse,A.M.Rogers,G.L.Wilson,N.D’Olympia,M.Devlin,N.Fotiades,J.A.Gomez,S.M.Mosby,R.O.Nelson,Nucl.Inst.Meth.Phys.Res.A(2018)(inpress)


ChargecomparisonGeneratestrainingdata

ArtificialNeuralNetworkSupervisedlearning

K-meansClusteringUnsupervisedlearning

Machinelearningalgorithmscapableofseparatingneutronsandgamma-raysinCLYCscintillators intheenergyrangeinvestigated

neutron

gamma

machinelearningn-g discrimination

neutron

gamma

neutron

gamma


E.Doucet,T.Brown,P.Chowdhury,C.J.Lister,C.Morse,P.C.Bender,A.M.Rogers,Nucl.Inst.Meth.Phys.Res.A(2018)(inpress)


CLYC– intrinsicactivity3”x3”C7LYC

10-hrs0.4alphas/s

ActinidecontaminantsDifferentmaterialbatchesdifferentNeutronactivationunderstudyEventualneedtospecifyimpuritytolerances


R.S.Woolf etal.,Nucl.Inst.Meth.Phys.Res.A(2018)(inpress)

new post-irradiation


Efficiencyestimates&35Cl(n,p)cross-sections

ENDF/B-VII.0(2006) ENDF/B-VII.1(2011)

1”

MCNPX



35Cl(n,p)cross-sections

Proposaltodirectlymeasurethe35Cl(n,p)reactioncrosssectionwiththeLENZarrayofSidetectors(experimentperformedinJanuary2018,underanalysis)


12C(n,n’) 12C(n,n’)

TOFenergyMeasuredenergy

TOFenergy

Measureden

ergy

12C(n,n’)datafromfirstLANLexperimentwithC7LYCarray

ResonancesinincidentneutronenergiesmeasuredviaTOFReflectsstructurein35Cl(n,p)cross-sections


UMassLowellRadiationLaboratory:Facilities

5.5 MV CN singleended Van de Graaff

1 MW research reactor

p,d,Heions;100μADCbeam;sub-nspulsing;mono-energeticpulsedneutrons

via7Li(p,n);fast-neutron

beamlineionmicroprobe;generalpurpose

scatteringchamber

openpool;LEUfuel;3horizontalbeamports;in-coresamplelocation(~1013 n/cm2/s);graphitethermalcolumn(~106 n/cm2/s);digitalneutronradiographyhotcellwithremotemanipulators100kCi60Cosourceforgammairradiation



✦DirectlymeasureC7LYCefficiencyataccelerator✦Mono-energeticneutronsvia7Li(p,n)7Be✦Neutronproductionratevia7Beassay(52-dayhalf-life)✦One7Beperneutron,10%b-decaybranch,479-keVg-ray


In-situ lithium target evaporator

LiFonWbacking132µg/cm2

quartzviewer

diagnosticcross

2018 2019

C7LYCefficiencymeasurementsatUML


C7LYCtests(2018)

7Li(p,n)7Be (g.s)

7Li(p,n)7Be*

Neutronspectrumfrom7Li(p,n)7Be

3”x3”Neutronenergy(keV)

En = 2 MeV

En = 1.5 MeV

En = 1 MeV

En = 0.5 MeV

En = 0.25 MeVStaytunedfor2019results

429keV



b-delayedneutronsatCARIBU:94Rbà 94Sr

X-ArraySCANS

GammabackgroundinCARIBUhall

PAST

FUTURE

SATURN

A.J.Mitchellatal.,NIM

A763,232(2014)

Testexperimentunsuccessful,toberepeatedinnewlow-backgroundCARIBUhall



goingmoreneutron-richatNSCL



b-n%

48%

>95%

5.4% 14% 58% 52%

47%24%37%

12.6%

55% 97%84%38%26%8.5% <33%

>61%59%60%28%17%12.4%

30%

6.2%

28%



testexperimentwithLaBr3 array&SEGA

80pnA48CaLISE++ 4p shellof3”x3”C7LYC

Rateestimates(currenttechnology)

SEGA

LaBr3

C7LYC


Collaborators:B.Crider,S.Liddick etal.


fissionneutronspectroscopywithC7LYC

12µCi252Cfsource C7LYC+CHICO+GRETINA

Dt-C7LYC-CHICOC7LYCsingles


Collaborator:S.Zhu


• LANL(n,n’)proof-of-principleexperimentasuccess• Machinelearningalgorithmscapableofn-g discrimination• Actinidecontaminantsneedtolerancespecifications

• 35Cl(n,p)cross-sectionsunderanalysisatLANL(necessaryforsimulations)

• EfficiencymeasurementsongoingatUMLVandeGraaff• Beta-delayedneutronmeasurementsawaitedatnew

CARIBUhall• NewfissionneutrondatawithGRETINAandCHICO2• Beta-delayedneutrontestsatNSCLtobeanalyzed• C7LYC:auxiliarydetectorcandidateforFRIBdecaystation?

Summary&Outlook


Thankyouforyourattention!

Documents

Nuclear Science with a C LYC Array · Post-docs A.J. Mitchell Gemma Wilson* Chris Morse* Edward Lamere* Faculty Partha Chowdhury (PI)* Kim Lister (co-PI)* Andrew Rogers Peter Bender