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arXiv 2001.10235nucl-exnucl-th
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$^{249,251}$ Md的在束gamma-ray和电子能谱

In-beam gamma-ray and electron spectroscopy of $^{249,251}$Md

R. Briselet, Ch. Theisen, B. Sulignano, M. Airiau, K. Auranen, D. M. Cox, F. Déchery, A. Drouart, Z. Favier, B. Gall, T. Goigoux, T. Grahn, P. T. Greenlees, K. … 展开作者

R. Briselet, Ch. Theisen, B. Sulignano, M. Airiau, K. Auranen, D. M. Cox, F. Déchery, A. Drouart, Z. Favier, B. Gall, T. Goigoux, T. Grahn, P. T. Greenlees, K. Hauschild, A. Herzan, R. -D. Herzberg, U. Jakobsson, R. Julin, S. Juutinen, J. Konki, M. Leino, A. Lopez-Martens, A. Mistry, P. Nieminen, J. Pakarinen, P. Papadakis, P. Peura, P. Rahkila, E. Rey-Herme, J. Rubert, P. Ruotsalainen, M. Sandzelius, J. Sarén, C. Scholey, J. Sorri, S. Stolze, J. Uusitalo, M. Vandebrouck, A. Ward, M. Zielińska, B. Bally, M. Bender, W. Ryssens

摘要:

用$γ$ -射线和转换电子束能谱研究了奇数- $Z$ $^{251}$ Md核。除了先前观察到的基于$[521]1/2^-$组态的转动带之外,还利用$γ$ - $γ$符合确定了另一种转动结构。使用电子能谱允许的旋转带被观察到在一个更大的旋转频率范围。使用依赖于旋磁因子的跃迁强度,已经推断出该带的$[514]7/2^-$单粒子构型,即,基态能带通过模拟一组未分辨的激发带,很好地再现了占主导地位的电子光谱强度为$\simeq$ 60%的物理背景。此外,作为角动量的函数的强度分布的详细分析提供了用于导出轨道旋磁因子的方法,即用于基态带的$g_K = 0.69^{+0.19}_{-0.16}$。使用$γ$射线束内光谱研究了奇- $Z$ $^{249}$ Md。在两个$^{249,251}$ Md中都发现了由$Δl = Δj = 3$ $[521]3/2^-$和$[633]7/2^+$ Nilsson轨道混合引起的八极相关的证据。一个令人惊讶的相似性的$^{251}$ Md的基态带跃迁能量与那些的$^{255}$ Lr的激发带已被讨论在相同的频带。进行Skyrme-Hartree-Fock-Bogoliubov计算以调查这些带之间的相似性的起源。

英文摘要:

The odd-$Z$ $^{251}$Md nucleus was studied using combined $γ$-ray and conversion-electron in-beam spectroscopy. Besides the previously observed rotational band based on the $[521]1/2^-$ configuration, another rotational structure has been identified using $γ$-$γ$ coincidences. The use of electron spectroscopy allowed the rotational bands to be observed over a larger rotational frequency range. Using the transition intensities that depend on the gyromagnetic factor, a $[514]7/2^-$ single-particle configuration has been inferred for this band, i.e., the ground-state band. A physical background that dominates the electron spectrum with an intensity of $\simeq$ 60% was well reproduced by simulating a set of unresolved excited bands. Moreover, a detailed analysis of the intensity profile as a function of the angular momentum provided a method for deriving the orbital gyromagnetic factor, namely $g_K = 0.69^{+0.19}_{-0.16}$ for the ground-state band. The odd-$Z$ $^{249}$Md was studied using $γ$-ray in-beam spectroscopy. Evidence for octupole correlations resulting from the mixing of the $Δl = Δj = 3$ $[521]3/2^-$ and $[633]7/2^+$ Nilsson orbitals were found in both $^{249,251}$Md. A surprising similarity of the $^{251}$Md ground-state band transition energies with those of the excited band of $^{255}$Lr has been discussed in terms of identical bands. Skyrme-Hartree-Fock-Bogoliubov calculations were performed to investigate the origin of the similarities between these bands.

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