论文标题
BA-MO确认的异常中子产量，并从自发裂变$^{252} $ CF中新观察到CE-ZR
Anomalous Neutron Yields Confirmed for Ba-Mo and Newly Observed for Ce-Zr from Spontaneous Fission of $^{252}$Cf
论文作者
论文摘要
我们从$^{252} $ cf的自发裂变中重新研究了BA-MO，CE-ZR，TE-PD和ND-SR的中子多重性产量；通过（i）同时使用$γ$ - $γ$ - $γ$ - $γ$和$γ$ - $γ$ - $γ$ - $γ$重合数据，（ii）使用最新的水平级别的方案结构，以及（iii）在多个同位素中进行类似的能量过渡，我们已经比以前的分析实现了更高的精度。特别注意BA-MO对，我们的结果清楚地证实了BA-MO产量数据具有第二个热裂变模式，其中观察到8、9、10和现在观察到11个中子蒸发通道。这些是11个中子通道的第一个观察结果。在CE-ZR对中首次观察到这些8-11中子通道，但在其他裂变对中未观察到。 BA-MO和CE-ZR对中第二模式的测量强度分别为$ \ sim $ 1.5（4）$ \％$和$ \ sim $ 1.0（3）$ \％$。这些高的中子数蒸发模式可以表明$^{143-145} $ ba中的过度形式和/或八度变形，而在$^{146,148} $ ce中，在分裂时会产生如此高的中子多样性。
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.
