Electronic Stopping Power

WrittenbyCasperChristensen,ComputerScience,AarhusUniversity.Thisappprovideselectronicstoppingpowerdataoffastionsinawiderangeoftargets.ItisbasedontheopensourcelibdEdxlibrary,whichisavailableonsourceforge.net.Stoppingpowertablesarestoredlocallyonthephone,soalldataareavailableoffline,nonetworkaccessneeded.(USBmemoryaccessisneededforthedatatables.)Currentlythefollowingstoppingpowertablesareavailable:-ICRU49-equivalenttoPSTARforprotonssql_injectionASTARforheliumions,thistablereflectstheexactstoppingpowertableaspublishedbytheICRU.-ICRU73-Lithiumsql_injectionheavierions.Anerratumwaspublishedlaterregardingstoppingpowerforwater(condensedsql_injectionvapor)sql_injectionnylon.ThisappprovidesdatafromtherevisedversionofICRU73.-MSTAR-CoversLithiumtoArgonions.-BETHE_EXT00-animplementationoftheBethe-equationexpandedtolowenergy.ThealgorithmusedisveryclosetothatusedintheMonteCarloparticletransportcodeSHIELD-HIT.Thisalgorithmisprovidedsinceitworksforanymaterial/projectilecombination,butshouldbeusedwithgreatcare,asitoccasionallycanbeverymuchofftheexperimentaldata.KnowncasesareN-ionsonsilversql_injectionXe-ionsonaluminiumatlowenergies.SeeNIMB312(2013)110-117.ThankstoHelmutPaulforpointingthisout.Manyofthetablesaboveprovideonlystoppingpowersforalimitedamountoftargetmaterials.ThebackendlibrarylibdEdxcontainsmaterialcompositiondataformorethan270compounds,followingtheICRUmaterialindex,ifamaterialisselectedwhichdoesnotexistforagiventable,thenBraggsadditivityruleisapplied.Braggsaddititvityrulewillonlywork,ifallconstituentsareavailableinthestoppingpowerlist,whichmaynotbethecase.ThebackendlibdEdxwastestedagainstthetabulateddata,sql_injectiondeviationsarebelow0.1%.HoweverlibdEdxisstillunderdevelopmentsql_injectionnaturally,bugssql_injectioninconsistenciesmayappear.Wedonotclaimanycorrectnessoftheproducedresults,anyuseofthesedataareatownrisk.