compu&ng the size of the atomic nucleus...
TRANSCRIPT
ImpactObjec,ves§ Determinethesizeoftheatomicnucleuscalcium-48.Forthenucleus
calcium-48,whichconsistsof20protonsand28neutrons,theneutrondistribu>onextendsbeyondtheprotondistribu>onandtherebysetstheactualsizeofthenucleus
§ Ab-ini>ocomputa>onoftheneutronandweak-chargedistribu>onsof48Cabasedonstate-of-the-artop>mizedchiraleffec>veinterac>ons
§ Provideaconstraintontheradiusofaneutronstar
§ Provideacri>calbridgebetweenstate-of-the-artabini,ocalcula>onsandcalcula>onsbasedonnucleardensityfunc>onaltheory(DFT)
§ NeutronradiuswillbemeasuredbytheCREX(Calcium-RadiusEXperiment)atJeffersonLaboratory,andthedipolepolarizabilityispresentlybeinganalyzedbytheDarmstadt-Osakacollabora>on
§ Thesizeoftheatomicnucleus48Caimpactsthesizeofaneutronstar
§ KnowledgeoftheneutronskinofatomicnucleisofarmostlybasedonnuclearDFT
§ Theatomicnucleuscalcium-48providesamee>ngpointforab-ini>ocomputa>onsandcalcula>onsbasedonnuclearDFT
§ Computedthesizeofatomicnucleus48Cafromfirstprinciples
§ Extendedthereachofreliableabini>ocomputa>onstomedium-massnuclei
§ Revealedthattheneutronskinofcalcium-48issignificantlythinnerthanpreviouslythought,whiletherelateddipolepolarizabilityisconsistentwithcalcula>onsbasedonnuclearDFT
§ Foundneutronskintobeindependentoftheemployedchiraleffec>veinterac>onsbetweenthecons>tuentnucleons—protonsandneutrons
Accomplishments
Compu&ngthesizeoftheatomicnucleuscalcium-48
Cap,on:Imageconnectsthefirst-principlescomputa,onofthecalcium-48nucleuswiththeneutronstaratthecenteroftheCrabNebula.Understandingtheneutrondistribu,onofanatomicnucleusallowsresearcherstoconstrainthesizeofaneutronstar.Theseobjectsdifferinsizeby18ordersofmagnitude.Imagecredit:OakRidgeNa,onalLaboratory,U.S.Dept.ofEnergy;conceptualartbyLeJeanHardinandAndySproles
Reference:G.Hagenetal.,NaturePhysics(2015),doi:10.1038/nphys3529Contact:G.Hagen,[email protected]