nuclear science with a c lyc array · post-docs a.j. mitchell gemma wilson* chris morse* edward...
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Learning with PurposeLearning with Purpose
NuclearSciencewithaC7LYCArray
ParthaChowdhuryUniversityofMassachusettsLowell
WorksupportedbyU.S.DepartmentofEnergy
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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
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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
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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Learning with Purpose
UMassLowellCLYC-ers
UndergraduateMichaelD’Eon*JosephDopfer*
GraduateTristanBrown*EmeryDoucet*NathanD’Olympia*EmilyJacksonPatrickCopp
Post-docsA.J.MitchellGemmaWilson*ChrisMorse*EdwardLamere*
FacultyParthaChowdhury(PI)*KimLister(co-PI)*AndrewRogersPeterBender
*receiveddirectsupportfromNNSAgrant
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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Learning with Purpose
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
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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Learning with Purpose
dualn-g scintillatorCs2LiYCl6 (CLYC):prehistory
g
g resolutionbetterthanNaI
Pu(Be) source
< 5%
gammas
neutrons
Thermalneutronresponsevia6Li(n,a)t,Q=+4.8MeV
DOE-SBIRindustrygrantwith
RMDInc.
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
excellentn-g PSD
Fastneutronresponsevia35Cl(n,p)35S,Q=+615keV
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Learning with Purpose
• 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
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
•~10%neutronpulseheightresolution!!• NolongToFarmneeded• closeplacementallowsincreasedgeometricalefficiency
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56Fe(n,n’)SCANSatLANSCE
•800MeVpulsedprotonsonWspallationtarget•20mflightpathtoscatteringtarget(Fe)•C7LYCdetectors17cmfromtarget• TOFtodetectorprovidesincidentenergy•PulseheightinC7LYCprovidesscatteredenergy
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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56Fe(n,n’)SCANSatLANSCE
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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56Fe(n,n’)SCANSatLANSCE
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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Learning with Purpose
56Fe(n,n’)SCANSatLANSCE
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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)
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Learning with Purpose
ChargecomparisonGeneratestrainingdata
ArtificialNeuralNetworkSupervisedlearning
K-meansClusteringUnsupervisedlearning
Machinelearningalgorithmscapableofseparatingneutronsandgamma-raysinCLYCscintillators intheenergyrangeinvestigated
neutron
gamma
machinelearningn-g discrimination
neutron
gamma
neutron
gamma
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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)
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Learning with Purpose
CLYC– intrinsicactivity3”x3”C7LYC
10-hrs0.4alphas/s
ActinidecontaminantsDifferentmaterialbatchesdifferentNeutronactivationunderstudyEventualneedtospecifyimpuritytolerances
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
R.S.Woolf etal.,Nucl.Inst.Meth.Phys.Res.A(2018)(inpress)
new post-irradiation
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Learning with Purpose
Efficiencyestimates&35Cl(n,p)cross-sections
ENDF/B-VII.0(2006) ENDF/B-VII.1(2011)
1”
MCNPX
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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Learning with Purpose
35Cl(n,p)cross-sections
Proposaltodirectlymeasurethe35Cl(n,p)reactioncrosssectionwiththeLENZarrayofSidetectors(experimentperformedinJanuary2018,underanalysis)
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
12C(n,n’) 12C(n,n’)
TOFenergyMeasuredenergy
TOFenergy
Measureden
ergy
12C(n,n’)datafromfirstLANLexperimentwithC7LYCarray
ResonancesinincidentneutronenergiesmeasuredviaTOFReflectsstructurein35Cl(n,p)cross-sections
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Learning with Purpose
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
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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✦DirectlymeasureC7LYCefficiencyataccelerator✦Mono-energeticneutronsvia7Li(p,n)7Be✦Neutronproductionratevia7Beassay(52-dayhalf-life)✦One7Beperneutron,10%b-decaybranch,479-keVg-ray
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
In-situ lithium target evaporator
LiFonWbacking132µg/cm2
quartzviewer
diagnosticcross
2018 2019
C7LYCefficiencymeasurementsatUML
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Learning with Purpose
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
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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b-delayedneutronsatCARIBU:94Rbà 94Sr
X-ArraySCANS
GammabackgroundinCARIBUhall
PAST
FUTURE
SATURN
A.J.Mitchellatal.,NIM
A763,232(2014)
Testexperimentunsuccessful,toberepeatedinnewlow-backgroundCARIBUhall
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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goingmoreneutron-richatNSCL
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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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%
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
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Learning with Purpose
testexperimentwithLaBr3 array&SEGA
80pnA48CaLISE++ 4p shellof3”x3”C7LYC
Rateestimates(currenttechnology)
SEGA
LaBr3
C7LYC
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
Collaborators:B.Crider,S.Liddick etal.
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fissionneutronspectroscopywithC7LYC
12µCi252Cfsource C7LYC+CHICO+GRETINA
Dt-C7LYC-CHICOC7LYCsingles
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
Collaborator:S.Zhu
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Learning with Purpose
• 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
Chowdhury NNSA-SSAP Symposium Albuquerque Feb 20, 2019
Thankyouforyourattention!