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

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### Abstract

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 $$\gamma$$-$$\gamma$$-$$\gamma$$-$$\gamma$$ and $$\gamma$$-$$\gamma$$-$$\gamma$$ 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.

### Author and article information

###### Journal
15 July 2020
###### Article
10.1103/PhysRevC.101.034610
2007.07868