Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252

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.

doi:10.1103/PhysRevC.101.034610

Title: Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of ${}^{252}{Cf}$

Journal Article · 17 March 2020 · Physical Review C

DOI: https://doi.org/10.1103/PhysRevC.101.034610 · OSTI ID:1605559

^[1]; Thibeault, A. H. ^[1]; Richards, T. H. ^[2];

^[1];

^[1]; Ramayya, A. V. ^[1]; Luo, Y. X. ^[3]; Rasmussen, J. O. ^[4];

^[5]; Oganessian, Yu. Ts. ^[5]; Zhu, S. J. ^[6]

Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy
Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
Tsinghua Univ., Beijing (China). Dept. of Physics

We reinvestigated the neutron multiplicity yields of Ba-Mo, Ce-Zr, Te-Pd, and Nd-Sr from the spontaneous fission of ²⁵²Cf by (i) using both γ -γ -γ -γ and γ -γ -γ coincidence data, (ii) using up to date level scheme structures, and (iii) crosschecking 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 8–10, 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 ~1.5(4)% and ~1.0(3)%, respectively. These high neutron number evaporation modes can be an indication of hyperdeformation and/or octupole deformation in ^143-145Ba and in ^146,148Ce at scission to give rise to such high neutron multiplicities.

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Research Organization:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE

Grant/Contract Number:: FG05-88ER40407; AC03-76SF00098; FG02-88ER40407

OSTI ID:: 1605559

Alternate ID(s):: OSTI ID: 1605316; OSTI ID: 1809144

Journal Information:: Physical Review C, Vol. 101, Issue 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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References (29)

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Title: Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf 252

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Title: Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of ${}^{252}{Cf}$