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arXiv 1504.05039nucl-ex
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用PDMATHAAC Y(p,$γ$)$^{90}$ Zr反应的部分截面对$^{90}$ Zr中$γ$射线强度函数的实验约束

Experimental constraints on the $γ$-ray strength function in $^{90}$Zr using partial cross sections of the $^{89}$Y(p,$γ$)$^{90}$Zr reaction

L. Netterdon, A. Endres, S. Goriely, J. Mayer, P. Scholz, M. Spieker, A. Zilges

摘要:

测量了$^{89}$ Y(p,$γ$)$^{90}$ Zr反应的部分截面,研究了中子-幻核$^{90}$ Zr中的$γ$射线强度函数.对于$E_p=3.65$ MeV和$E_p=4.70$ MeV之间的五个质子能量,用在束$γ$射线谱测量了$^{90}$ Zr中七个离散态布居的部分截面.由于这些$γ$射线跃迁主要是$E1$特征,本测量允许访问的低位偶极子强度在$^{90}$锆。根据实验数据,提取了$γ$射线强度函数,并成功地用该函数描述了该反应的总截面和部分截面。相对于先前测量的强度函数的显著差异,从光吸收数据点到与光激发和去激发强度函数相关的Brink-Axel假设的偏差。

英文摘要:

Partial cross sections of the $^{89}$Y(p,$γ$)$^{90}$Zr reaction have been measured to investigate the $γ$-ray strength function in the neutron-magic nucleus $^{90}$Zr. For five proton energies between $E_p=3.65$ MeV and $E_p=4.70$ MeV, partial cross sections for the population of seven discrete states in $^{90}$Zr have been determined by means of in-beam $γ$-ray spectroscopy. Since these $γ$-ray transitions are dominantly of $E1$ character, the present measurement allows an access to the low-lying dipole strength in $^{90}$Zr. A $γ$-ray strength function based on the experimental data could be extracted, which is used to describe the total and partial cross sections of this reaction by Hauser-Feshbach calculations successfully. Significant differences with respect to previously measured strength functions from photoabsorption data point towards deviations from the Brink-Axel hypothesis relating the photo-excitation and de-excitation strength functions.

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