Isomer-tagged differential-plunger measurements in proton-unbound 144Ho
Isomer-tagged differential-plunger measurements in proton-unbound 144Ho
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非质子束缚 144Ho 中异构体标记的差动柱塞测量
DOI:
10.1016/j.physletb.2009.11.042
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发表时间:
2010
影响因子:
4.4
通讯作者:
Mason P
中科院分区:
文献类型:
--
作者:
Mason P
The lifetime of an excited state above a weakly populated isomer in the proton-unbound odd–odd nucleus144Ho has been measured using the recoil distance Doppler shift method. This measurement represents the first differential-plunger lifetime measurement to utilize recoil-isomer tagging. The first excited Iπ=(10+) state above the two-quasiparticle πh11/2⊗νh11/2(8+) isomer was determined to have a lifetime of τ=6(1) ps. Potential energy surface calculations, based on the configuration-constrained blocking method, predict the isomeric state to have γ-soft triaxial-nuclear shape with |γ|≈24°. The lifetime of the (10+) state can be understood from these calculations if there is a degree of rotational alignment in this band, with the K value being lower than the bandhead spin. However, the validity of the K quantum number with large predicted triaxiality and gamma softness requires further theoretical study.
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发表时间:
2003
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