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

Abstract

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.

Authors:
ORCiD logo [1];  [1];  [2]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1];  [3];  [4]; ORCiD logo [5];  [5];  [6]
  1. Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy
  2. Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Univ. of Alabama, Tuscaloosa, AL (United States). Dept. of Physics and Astronomy
  3. Vanderbilt Univ., Nashville, TN (United States). Dept. of Physics and Astronomy; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  5. Joint Inst. for Nuclear Research (JINR), Dubna (Russian Federation)
  6. Tsinghua Univ., Beijing (China). Dept. of Physics
Publication Date:
Research Org.:
Vanderbilt Univ., Nashville, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)
OSTI Identifier:
1605559
Alternate Identifier(s):
OSTI ID: 1605316
Grant/Contract Number:  
[FG05-88ER40407; AC03-76SF00098]
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review C
Additional Journal Information:
[ Journal Volume: 101; Journal Issue: 3]; Journal ID: ISSN 2469-9985
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 252-Cf; fission; yields matrix; extra hot fission mode; octupole; hyperderformation

Citation Formats

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., and Zhu, S. J. Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252. United States: N. p., 2020. Web. doi:10.1103/PhysRevC.101.034610.
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. Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252. United States. doi:10.1103/PhysRevC.101.034610.
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., and Zhu, S. J. Tue . "Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252". United States. doi:10.1103/PhysRevC.101.034610.
@article{osti_1605559,
title = {Anomalous neutron yields confirmed for Ba-Mo and newly observed for Ce-Zr from spontaneous fission of Cf252},
author = {Musangu, B. M. and Thibeault, A. H. and Richards, T. H. and Wang, E. H. and Hamilton, J. H. and Zachary, C. J. and Eldridge, J. M. and Ramayya, A. V. and Luo, Y. X. and Rasmussen, J. O. and Ter-Akopian, G. M. and Oganessian, Yu. Ts. and Zhu, S. J.},
abstractNote = {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.},
doi = {10.1103/PhysRevC.101.034610},
journal = {Physical Review C},
number = [3],
volume = [101],
place = {United States},
year = {2020},
month = {3}
}

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