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简介：DigitaldecayspectroscopyofactinideisotopesatthegasfilledseparatorSHANSAlloverthechartofnuclides,theregiontothe“north-east”of208Pb,withZ≥84andN=128~130,hoststheshortest-livedαradioactivities,withhalf-livesintherangeofnanosecondstomicroseconds.Synthesisanddetectionofneutron-deficientisotopesabovethoriuminthisregionarechallengingduetotheirlowproductioncrosssectionsandshorthalf-lives.

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简介：Thephotonpolarizationtensorcarriesthefundamentalinformationofmagnetizedvacuumormedium[1{5].Acompletedescriptionofthevacuumpolarizationtensorisparticularlycomplicatedtoapproach,sincethevacuumphotonpolarizationtensorisexpressedintermsofadoublesummationofinfiniteserieswithrespecttotwoLandaulevelsoccupiedbyvirtualchargedparticles.MostworkswerefocusingonthestrongfiledlimitwithanassumptionofLowestLandauLevel(LLL)[2,6]InRef.[7]weobtainedafulldescriptionofvacuumpolarizationtensorinresponsetoalltheLandaulevelsatanyfieldstrengthofBforthefirsttimebeyondLLLapproximation,andwefoundoutthattheimaginarypartofthephotonpolarizationtensorξΠbecomesnonzeroatthetimelikemomentaregionQ2>4(M2+2neB)atT=0,i.e..,theLLLapproximationisanalyticallysatisfied[3,7].

简介：HIRFL-CSRacceleratorfacilityhasbeenoperatingwith3ionsources,whichareLAPECR1,LECR3andSECRAL.Theseionsourcescanprovidedifferentkindsofionswithdifferentenergy.Forexample,LAPECR1mainlyprovidesH+andHe+witheextractionvoltageabove25keV,LECR3canprovidetheionbeamswithlowtomediumchargestates,includingthemetallicionswithlowmass,suchasC^4+,Ar^11+,B^3+,Mg^7+,etc.,whileSECRALaimstoproduceintenseandhighlychargedionbeams,especiallymetallicones,suchlikeKr^19+,Xe^31+,Ni^19+,Bi^31+,U^33+,andsoon.

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简介：ThespectrumoftheΣ(1193)excitedstates,Σ,withisospinI=1andstrangenessS=??1isoneofthemostimportantissuesinhadronicphysics.TheΣresonancesaremostlyproducedandstudiedinK-inducedreactions.ManyΣresonancesarenowcatalogedbytheParticleDataGroup[1].However,ourknowledgeoftheseresonancesisstillverypoor.Intheenergyregionbelow2GeV,onlyafewofthemarewellestablished,suchastheΣ(1385)ofspin-parityJP=3=2+,Σ(1670)ofJp=3=2??andΣ(1775)ofJp=5=2??.Theothersarenotwellestablishedandsomeofthemareevenoflargeuncertaintiesontheirexistence.Thus,thestudyoftheΣresonancewiththeavailableexperimentaldataisnecessary.

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简介：ＥｘｐｅｒｉｍｅｎｔａｌＭｅａｓｕｒｅｍｅｎｔｓｏｆＮｅｕｔｒｏｎＤｉｓｔｒｉｂｕｔｉｏｎｓｉｎ５０ＭｅＶ／ｕ１８Ｏ＋Ｂｅ，ＣｕａｎｄＡｕＲｅａｃｔｉｏｎｓ￥ＬｉＧｕｉｓｈｅｎｇ；ＺｈａｎｇＴｉａｎｍｅｉ；ＬｉＺｏｎｇｗｅｉａｎｄＳｕＹｏｕｗｕ?..

简介：Muscovitemicasheetswithathicknessof12mwereirradiatedbyswiftheavyionsKrandBifromHeavyIonResearchFacilityinLanzhou(HIRFL).Theuencesrangefrom11010to11012ions/cm2.Theelectronicenergyloss(dE/dx)eincreasesfrom5.9to31.5keV/nm.ThevibrationalmodicationsinirradiatedmicawereinvestigatedbyFourier-transforminfraredspectroscopyandthelatenttrackswereobservedbytransmissionelectronmicroscope(TEM).Theinfraredspectrumshowsthatmotionsfromallatomtypesinthemuscovitemicastructurecouldbefoundinmodesforallvibrations.AsshowninFig.1,theintensityofallvibrationalmodesinmica,includingtheOHstretchmotionat3621cm??1,decreasedwiththeincreasing(dE/dx)e.Thesimilartendencyisfoundinsamplesirradiatedbyswiftheavyionswithincreasingionuence.Itisindicatedthatdefectsandstructuralmodicationsgeneratedduringswiftheavyionirradiation,andmoredefectsareintroducedbyirradiationwithhigherionuence.

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简介：ＲｅｃｏｉｌＲａｎｇｅｓｏｆＮｅａｒ－ｔａｒｇｅｔＰｒｏｄｕｃｔｓｆｒｏｍ５０ＭｅＶ／ｕ１８Ｏ＋１９７Ａｕ￥ＹａｎｇＹｏｎｇｆｅｎｇ；ＺｈａｏＺｈｉｚｈｅｎｇ；ＬｉＺｏｎｇｗｅｉ；ＺｈｕＳｈａｏｆｅｉ；ＣａｔＸｉｃｈｅｎｇ；Ｙａ...

简介：ＡｃｔｉｖａｔｉｏｎＭｅａｓｕｒｅｍｅｎｔｓｏｆＮｅｕｔｒｏｎＤｏｓｅＥｑｕｉｖａｌｅｎｔＲａｔｅｓｉｎ５０ＭｅＶ／ｕ￣（１８）Ｏ－ｉｏｎＴａｒｇｅｔＡｒｅａ￥ＬｉＧｕｉｓｈｅｎｇ；ＺｈａｎｇＴｉａｎｍｅｉ；ＬｉＺｏｎｇｗｅｉａｎｄＳｕＹｏｕｗｕＮｅ...

简介：近代科学进入中国之回顾与前瞻──诺贝尔奖获得者杨振宁博士１９９４年８月１８日在南宁的演讲有机会同大家讨论近代科学进入中国之回顾与前瞻，我很高兴。今天我要谈的是，近代科学如何发源于西方，随后又怎样进入中国的经过。了解这个过程以后，我们就能够对今天中华民...