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arXiv 2007.07868nucl-ex
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$^{252}$ Cf的自发Fission中Ba-Mo和Ce-Zr的异常中子产额

Anomalous Neutron Yields Confirmed for Ba-Mo and Newly Observed for Ce-Zr from Spontaneous Fission of $^{252}$Cf

B. M. Musangu, A. H. Thibeault, T. H. Richards, E. H. Wang, J. H. Hamilton, C. J. Zachary, J. M. Eldridge, A. V. Ramayya, Y. X. Luo, J. O. Rasmussen, G. M. Ter-… 展开作者

B. M. Musangu, A. H. Thibeault, T. H. Richards, E. H. Wang, J. H. Hamilton, C. J. Zachary, J. M. Eldridge, A. V. Ramayya, Y. X. Luo, J. O. Rasmussen, G. M. Ter-Akopian, Yu. Ts. Oganessian, S. J. Zhu

发表信息：
Brooks M. Musangu et al. ''Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of 252Cf''. In: Phys. Rev. C101 (3 Mar. 2020), p. 034610. DOI: 10.1103/PhysRevC.101.034610
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摘要：

我们重新研究了$^{252}$ Cf自发裂变产生的Ba-Mo，Ce-Zr，Te-Pd和Nd-Sr的中子多重数产额;通过（i）使用$γ$-$γ$-$γ$-$γ$和$γ$-$γ$ - $γ$两者的符合数据，（ii）使用最新的能级方案结构，和（iii）交叉检查多个同位素中的类似能量跃迁，我们取得了比以往分析更高的精确度。特别注意的Ba-Mo对，我们的结果清楚地证实，Ba-Mo产额数据有第二个热裂变模式，其中观察到8，9，10，现在11个中子蒸发通道。这是对11个中子通道的首次观测。这8-11个中子通道是在Ce-Zr对中首次观察到的，但在其他裂变对中没有观察到。Ba-Mo和Ce-Zr对的第二模强度分别为$\sim$ 1.5（4）$\%$和$\sim$ 1.0（3）$\%$。这些高中子数蒸发模式可以是$^{143-145}$ Ba和$^{146,148}$ Ce在断裂时的超形变和/或八极形变的指示，以产生如此高的中子多重性。

英文摘要：

We reinvestigated the neutron multiplicity yields of Ba-Mo, Ce-Zr, Te-Pd, and Nd-Sr from the spontaneous fission of $^{252}$Cf; by (i) using both $γ$-$γ$-$γ$-$γ$ and $γ$-$γ$-$γ$ coincidence data, (ii) using up to date level scheme structures, and (iii) cross-checking analogous energy transitions in multiple isotopes, we have achieved higher precision than previous analyses. Particular attention was given to the Ba-Mo pairs where our results clearly confirm that the Ba-Mo yield data have a second hot fission mode where 8, 9, 10, and now 11 neutron evaporation channels are observed. These are the first observations of the 11 neutron channel. These 8-11 neutron channels are observed for the first time in the Ce-Zr pairs, but are not observed in other fission pairs. The measured intensities of the second mode in Ba-Mo and Ce-Zr pairs are $\sim$1.5(4)$\%$ and $\sim$1.0(3)$\%$, respectively. These high neutron number evaporation modes can be an indication of hyperdeformation and/or octupole deformation in $^{143-145}$Ba and in $^{146,148}$Ce at scission to give rise to such high neutron multiplicities.

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