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Calibrationofa FusionExperimenttoInvestigatetheNuclearCaloricCurve
AshleighKeeler
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Background
• Nuclearequationofstate(EoS)importance:• Nucleosynthesis• Heavy-ioncollisions• Supernovaedynamics• Neutronstars
CaloricCurve
A.B. McIntosh et al. Physics Letters B 719 (2013) 337–340
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Introduction
• Tofurtherinvestigatethisresult,fusionreactions(78Kr+12C&86Kr+12C)weremeasured:• Thebeamenergywasvariedintherange15-35MeV/uinordertovarytheexcitationenergy.
Fusion
• Thelightchargedparticles(LCP’s)thatareevaporatedfromthenucleuscarryinformationaboutthetemperature.
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FAUST
• Si-CsI(TI)/PDdetectorarrayFAUST(ForwardArrayUsingSiliconTechnology)
• 68∆E-Etelescopes• Measures LCP’s• 1.6° ≤θ ≤45°
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ChargeSplitting
SchematicofDADL,showingtheequipotentiallinesontheuniformlyresistivesurface,whichallowsthepositiontobe
determinedbychargesplittingPhotographofDADL
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PositionCorrection
RawSum
(F1+F2)
F2– F1
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PositionCorrection
• Parametrizationofthecurvatureofthesebandsasafunctionofthetotalenergywasnecessaryinordertotakefulladvantageoftheresolutionofthesilicondetectors.
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PositionCorrection
F2– F1
CorrectedSum(F1+F2)
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EnergyCalibrationCo
unts
MeV
• Plottingseveralrunsallowedustodeterminethatthelocationoftheseenergypeaksdidnotchangesignificantlywithtime.
228Th
228Th
228Th
Alpha@15
Alpha@15
DegradedAlpha@15
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EnergyCalibration
• Fordetector21front,alinearfitisanaccuraterepresentationofthedatatowithin1.5%
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ParticleIdentification(PID)Ra
wSiSignal(∆E)
RawCsISignal(E)
H
He Li
Be
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ParticleIdentification(PID)
• Aparameterizedformula,basedontheBethe-Blochequation,wasusedtostraightenthePIDlinesmeasuredwiththe∆E-E technique.
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1H2H3H3He4He6He6Li7Li7Be9Be10Be
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Future
• Theparticleidentification(PID)andPIDcutsdescribedinthispresentationarebeingfinalized.• OncethePIDiscompleted,thenextstepistheenergycalibrationoftheCsIdetectors(basedonthesiliconenergycalibrationandthePID).
• PositionCalibration• ThiscalibrationofFAUSTwillallowfurtherstudyoftheasymmetryenergyintheEoStobeinvestigatedviathenuclearcaloriccurve.
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Acknowledgements
IwouldliketothanktheSJYresearchgroup,andthestaffoftheCyclotron.ThisworkwasenabledbygrantsfromtheDepartmentofEnergy(DE-FG02-93ER40773)andthe
RobertA.WelchFoundation(A-1266).
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