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).