2024年3月9日发(作者：)

·42·2017

2-16ExperimentalMeasurementofElasticandBreakupChannels

forthe

11

Be+

208

PbSystematabovetheCoulombBarrier

YangYanyun,WangJiansong,LiuXingquan,DuanFangfang,GaoZhihao,,MaPeng,MaJunbing,

BaiZhen,HuQiang,YuYuechao,YuGongmingandMaWeihu

Ourpreviousexperimentalresultforproton-richnucleus

8

BatabovetheCoulombbarriershowsthatinspiteof

itslowprotonseparationenergy(0.136MeV)thereisnostrongbreakupcouplingeffects

[1]

.Thefactisincontrast

totheobservationofneutron-richnuclei

11

maticstudyforelasticscattering

crosssectionsofneutron-richnucleus

11

Beandtheproton-halonucleus

8

Batlowandhigherenergiesshowsthat

theCoulombrainbowintheelasticscatteringof

11

Beisstillstronglysuppressedathighenergies

[2]

.Inorderto

examinethepredictions,experimentalmeasurementsfor

11

Beelasticscatteringandbreakupfor

11

Be+

208

Pbsystem

at141and209MeVwereperformedattheNationalLaboratoryofHeavyIonResearchoftheInstituteofModern

Physics,Lanzhou,China.

Thesecondarybeamsofradioactiveisotopeswereproducedbythefragmentationofthe

13

C

6+

primarybeam,

separatedbytheirmagneticrigidityusingHeavyIonResearchFacilityofLanzhou(HIRFL)

[3,4]

,ona

9

Betarget.

ThesecondarybeamsweredeliveredbytheRadioactiveIonBeamLineinLanzhou(RIBLL)

[5]

andimpingedon

a

208

PbtargetatRIBLLTerminal.A1500µmthickAlplatelocatedonthesecondfocalplane(F2)ofRIBLL

wrageintensitiesof

11

Be

were1000and1500particlespersecondat141and209MeV,ondarybeamswereidentified

byusingtimeofflightandenergyloss(TOF-∆E)

icalTOF-∆Espectrumforthesecondary

beamsareshowninFig.1.

Fig.1(coloronline)TheToF-∆Espectrumofthesec-

ondarybeamsinthisexperiment.

Fig.2(coloronline)Asketchofanexperimentalsetup.

blesidedSistripdetectors(DSSSDs)

withapositionresolutionof3mmwereusedtoreconstructthepositionandincidentangleoftheincomingbeam

sticandbreakupeventsweredetectedbyanewlydevelopedsilicondetector

arraywithfivesetsof∆elescopes(Tel1,Tel2andTel3)wereusedinthepresent

1consistedofa150µmthickDSSSD(128×128)infrontstackedwith1500µmsquaresilicon

detector(SSD)of100mm×100mminarea,forminga∆2andTel3consistedofa

150µmthickDSSSD(32×32)infrontstackedwith1500µmsquaresilicondetector(SSD)of64mm×64mmin

area,forminga∆candbreakupeventswereselectedinthetwo-dimensionalplot

of∆respondingdataanalysisisinprogressandtheresultswillbepublishedin

thenearfuture.

References

[1]

[2]

[3]

,,,etal.,.C,87(2013)044613.

,,,.C,94(2016)034614.

,，,etal.,.A,488(2002)11.

2017

[4]

[5]

·43·

,,,etal.,.,805(2008)533c.

,,,etal.,.A,503(2003)496.

2-17CharmoniumProductioninUltrarelativisticHeavy

IonCollisions

YuGongmingandWangJiansong

TheNRQCDapproach

[1]

,whichwasintroducedin1995,hasbecomethestandardframeworktostudyheavy

D,theFockstatestructureofheavyquarkoniumstateis

[2]