| Autor: |
Musangu, B. M., Thibeault, A. H., Richards, T. H., Wang, E. H., Hamilton, J. H., Zachary, C. J., Eldridge, J. M., Ramayya, A. V., Luo, Y. X., Rasmussen, J. O., Ter-Akopian, G. M., Oganessian, Yu. Ts., Zhu, S. J. |
| Rok vydání: |
2020 |
| Předmět: |
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| Zdroj: |
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 |
| Druh dokumentu: |
Working Paper |
| DOI: |
10.1103/PhysRevC.101.034610 |
| Popis: |
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. |
| Databáze: |
arXiv |
| Externí odkaz: |
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