Calibration of aFusion Experiment to Investigate the Nuclear … · 2019-07-03 · Introduction...
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Calibration of a Fusion Experiment to Investigate the Nuclear Caloric Curve Ashleigh Keeler
Transcript of Calibration of aFusion Experiment to Investigate the Nuclear … · 2019-07-03 · Introduction...
Calibrationofa FusionExperimenttoInvestigatetheNuclearCaloricCurve
AshleighKeeler
Background
• Nuclearequationofstate(EoS)importance:• Nucleosynthesis• Heavy-ioncollisions• Supernovaedynamics• Neutronstars
CaloricCurve
A.B. McIntosh et al. Physics Letters B 719 (2013) 337–340
Introduction
• Tofurtherinvestigatethisresult,fusionreactions(78Kr+12C&86Kr+12C)weremeasured:• Thebeamenergywasvariedintherange15-35MeV/uinordertovarytheexcitationenergy.
Fusion
• Thelightchargedparticles(LCP’s)thatareevaporatedfromthenucleuscarryinformationaboutthetemperature.
FAUST
• Si-CsI(TI)/PDdetectorarrayFAUST(ForwardArrayUsingSiliconTechnology)
• 68∆E-Etelescopes• Measures LCP’s• 1.6° ≤θ ≤45°
ChargeSplitting
SchematicofDADL,showingtheequipotentiallinesontheuniformlyresistivesurface,whichallowsthepositiontobe
determinedbychargesplittingPhotographofDADL
PositionCorrection
RawSum
(F1+F2)
F2– F1
PositionCorrection
• Parametrizationofthecurvatureofthesebandsasafunctionofthetotalenergywasnecessaryinordertotakefulladvantageoftheresolutionofthesilicondetectors.
PositionCorrection
F2– F1
CorrectedSum(F1+F2)
EnergyCalibrationCo
unts
MeV
• Plottingseveralrunsallowedustodeterminethatthelocationoftheseenergypeaksdidnotchangesignificantlywithtime.
228Th
228Th
228Th
Alpha@15
Alpha@15
DegradedAlpha@15
EnergyCalibration
• Fordetector21front,alinearfitisanaccuraterepresentationofthedatatowithin1.5%
ParticleIdentification(PID)Ra
wSiSignal(∆E)
RawCsISignal(E)
H
He Li
Be
ParticleIdentification(PID)
• Aparameterizedformula,basedontheBethe-Blochequation,wasusedtostraightenthePIDlinesmeasuredwiththe∆E-E technique.
1H2H3H3He4He6He6Li7Li7Be9Be10Be
Future
• Theparticleidentification(PID)andPIDcutsdescribedinthispresentationarebeingfinalized.• OncethePIDiscompleted,thenextstepistheenergycalibrationoftheCsIdetectors(basedonthesiliconenergycalibrationandthePID).
• PositionCalibration• ThiscalibrationofFAUSTwillallowfurtherstudyoftheasymmetryenergyintheEoStobeinvestigatedviathenuclearcaloriccurve.
Acknowledgements
IwouldliketothanktheSJYresearchgroup,andthestaffoftheCyclotron.ThisworkwasenabledbygrantsfromtheDepartmentofEnergy(DE-FG02-93ER40773)andthe
RobertA.WelchFoundation(A-1266).
