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1、第30卷增刊Ⅱ高能物理与核物理Vol.30,Supp.Ⅱ2006年12月HIGHENERGYPHYSICSANDNUCLEARPHYSICSDec.,2006¯-DelayedProtonDecaysintheRare-EarthRegionNearDripLine*1)XUShu-WeiLIZhan-KuiXIEYuan-XiangGUOWen-Tao(InstituteofModernPhysics,ChineseAcademyofSciences,Lanzhou730000,China)AbstractThehistoryofexperiment
2、alstudyon¯-delayedprotondecaysintherare-earthregionwassimplyreviewed.Thephysicalresultsofthe¯-delayedprotondecaysobtainedatIMP,Lanzhouoverthelast10yearsweresummarized,mainlyincludingthe¯rstobservationof9new¯-delayedprotonprecursorsalongtheodd-Zprotondriplineandthenewdatafor2wait
3、ing-pointnucleiintherp-process.Theresultswerecomparedanddiscussedwithdi®erentnuclearmodelcalculations.Finally,theperspectiveinnearfuturewasbrie°yintroduced.Keywords¯-delayedprotondecay,rare-earthregion,protondripline,waitingpointnuclei4054;5658;60641HistoricalreviewCa,Fe,NiandZn
4、,wereavailable.Fi-nally,morethan30¯-delayedprotondecaysintherare-earthregionwereobservedforthe¯rsttimeatFirststudyon¯-delayedproton(¯p)decayinLBL(seeFig.1).However,upto1995themaginrare-earthregionwasmadebyBogdanovetalatlineofknown¯-delayedprotonprecursorsintherare-[1]Dubnain1977
5、.Thestudiedisotopes,suchasearthregioncouldnotreachtheodd-Zprotondrip135Sm,133Sm,129Ndand131Nd,wereproducedvia[12]PlineZ=0.743N+11.6predictedbyHofmann.thefusionevaporationreactioninducedbyheavyionLFirstreportedbyLBLfrom1983to199332beamS.AnISOLfacilitynamedBEMS-2withaGFirstreporte
6、dbyGSIin1984LLLusurfaceionizationionsourcewasemployedtoidentifyDFirstreportedbyDubnain1977LLYbStableIsotopesLLTm145theisotopes.In1984the¯-delayeddecaysofDy,LLGLGErLLLHo147147149Dy,ErandErwereobservedforthe¯rsttimeSpeculatedodd-ZLLLLGGDyprotondripline:LLTb[2]58byD.SchardtetalatGS
7、I,whereNibeamandZ=0.743N+11.6LLGd(S.Hofmann)LLEuGSImassseparatorwithaFEBIADionsourcewereLDDSmLLPmusedintheirexperiment.DuringtheperiodfromLDDNdLLLPr1983to1993aremarkbleprogresswasreportedbyLLCeLLLa[3
8、11]NitschkeandWilmarthetalatLBLbecauseofN=626670747882followingtechnicalimprove
9、ments.Thesurfaceioniza-Fig.1.Chartoftherare-ear
