Extracting model-independent nuclear level densities away from stability

Extracting model-independent nuclear level densities away from stability
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从稳定性中提取与模型无关的核水平密度

DOI:
10.1103/physrevc.107.l011602
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发表时间:
2023
期刊:
影响因子:
3.1
通讯作者:
Görgen, A.
Görgen, A.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Mücher, D.;Spyrou, A.;Wiedeking, M.;Guttormsen, M.;Larsen, A. C.;Zeiser, F.;Harris, C.;Richard, A. L.;Smith, M. K.;Görgen, A.

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核能级密度(NLD)是在相对高能量下原子核复杂结构的基本量度。在这里,我们提出了第一个模型独立的测量的绝对部分NLD的短寿命的核。为此,我们适应最近推出的“形状方法”衰变实验,提供的形状的射线强度函数的外来核。在这项工作中,我们表明,形状方法与奥斯陆技术相结合,允许提取的NLD的人口状态,而不需要理论输入。这一发展开辟了道路的提取实验NLD远离稳定的天体物理和其他应用的重大影响。我们基准我们的方法使用数据的stablenucleus,发现与以前的实验结果非常一致。此外,我们给出了新的实验数据,并确定了短寿命核的绝对分能级密度。我们的研究结果表明,在NLD的情况下,增加了五倍,从半显微镜Hartree-Fock Bogoliubov计算推荐的RIPL 3核数据库的推荐值相比。然而,我们的结果与其他半微观水平的密度模型是很好的协议。我们证明了我们的方法对中子俘获率的影响,并表明我们的NLD实验不确定性满足天体物理计算预测过程丰度所需的要求。
The nuclear level density (NLD) is a fundamental measure of the complex structure of atomic nuclei at relatively high energies. Here we present the first model-independent measurement of the absolute partial NLD for a short-lived nucleus. For this purpose we adapt the recently introduced “shape method” for-decay experiments, providing the shape of the-ray strength function for exotic nuclei. In this work, we show that combining the shape method with the-Oslo technique allows for the extraction of the NLD of the populated states without the need for theoretical input. This development opens the way for the extraction of experimental NLDs far from stability with major implications in astrophysical and other applications. We benchmark our approach using data for the stablenucleus, finding excellent agreement with previous experimental results. In addition, we present new experimental data and determine the absolute partial level density for the short-livednucleus. Our results suggest a fivefold increase in the NLD for the case of, compared to the recommended values from semimicroscopic Hartree-Fock Bogoliubov calculations recommended by the RIPL3 nuclear data library. However, our results are in good agreement with other semimicroscopic level density models. We demonstrate the impact of our method on the) neutron capture rate and show that our experimental uncertainties for NLDs fulfill the requirements needed for astrophysical calculations predicting-process abundances.
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