Direct determination of ground-state transition widths of low-lying dipole states in 140Ce with the self-absorption technique

Direct determination of ground-state transition widths of low-lying dipole states in 140Ce with the self-absorption technique
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利用自吸收技术直接测定 140Ce 中低偶极子态的基态跃迁宽度

DOI:
10.1016/j.physletb.2015.04.013
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发表时间:
2015
期刊:
影响因子:
4.4
通讯作者:
--
中科院分区:
物理与天体物理2区
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--
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本文首次应用自吸收技术研究了~(140)Ce低激发态的衰变模式。特别地,基态跃迁宽度Γ 0和到基态的分支比Γ 0 Γ已经在pygmy偶极共振的能量域中被研究。相对自吸收测量允许独立于模型确定Γ 0。不需要对所有衰变通道进行完整的光谱分析,也可以确定基态的分支比。在达姆施塔特超导电子直线加速器S-DALINAC的韧致辐射装置上进行了~(140)Ce的实验。总的来说,自吸收,因此,Γ 0被确定为104个激发态的140 Ce。给出了计算结果,并结合DICEBOX程序进行了讨论。
The technique of self absorption has been applied for the first time to study the decay pattern of low-lying dipole states of 140 Ce. In particular, ground-state transition widths Γ 0 and branching ratios Γ 0 Γ to the ground state have been investigated in the energy domain of the pygmy dipole resonance. Relative self-absorption measurements allow for a model-independent determination of Γ 0. Without the need to perform a full spectroscopy of all decay channels, also the branching ratio to the ground state can be determined. The experiment on 140 Ce was conducted at the bremsstrahlung facility of the superconducting Darmstadt electron linear accelerator S-DALINAC. In total, the self-absorption and, thus, Γ 0 were determined for 104 excited states of 140 Ce. The obtained results are presented and discussed with respect to simulations of γ cascades using the DICEBOX code.
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