High-Spin Structure in Neutron-Rich ^108Ru Nucleus

Highspinstatesintheneutron-rich^108Runucleushavebeenstudiedthroughmeasuringpromptγ-raycoincidencesfollowingthespontaneousfissionof^252CfwiththeGammaspheredetectorarray.Theyrastbandhasbeenconfirmed.Theone-phononγ-vibrationalbandandthetwo-quasiparticlebandbasedonthe5^-levelhavebeenextendedupto13^+and15^-,respectively.Inaddition,twolevelsat1644.8keVand1826.5keVexcitationenergiesarenewlyidentifiedandproposedtobethemembersofatwo-phononγ-vibrationalband.Itisshownthatthe^108Runucleushastriaxialdeformationwithparametersβ2～0.29andγ=-22°fromthetotalRouthiansurfacecalculations.Theobservedbandcrossingintheyrastbandisduetothealignmentofapairofh11/2neutronsaccordingtothecrankedshellmodelcalculations.Thepossibleconfigurationforthetwo-quasiparticlebandhasbeendiscussed.

• 作者: 车兴来;朱胜江;J.H.Hamilton;A.V.Ramayya;J.K.Hwang;禹英男;李明亮;郑然成;I.Y.Lee;J.O.Rasmussen;Y.X.Luo;W.C.Ma
• 出处: 《中国物理快报：英文版》 2004年10期
• 关键词: 原子核物理学 高自旋结构 钌原子核 丰中子 Γ射线探测器 双准粒子带
• 分类: [理学][物理]