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Title: Bimodal symmetric fission observed in the heaviest elements

Abstract

We measured the mass and kinetic-energy partitioning in the spontaneous fission of /sup 258/Fm, /sup 259/Md, /sup 260/Md, /sup 258/No, and /sup 260/(104). All fissioned with mass distributions that were symmetric. Total-kinetic-energy distributions peaked near either 200 or 235 MeV. Surprisingly, these energy distributions were skewed upward or downward from the peak in each case, except for /sup 260/(104), indicating a composite of two energy distributions. We interpret this as a mixture of liquid-drop-like and fragment-shell directed symmetric fission, although theory had not anticipated this phenomenon.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
OSTI Identifier:
6095263
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Journal Article
Journal Name:
Phys. Rev. Lett.; (United States)
Additional Journal Information:
Journal Volume: 56:4
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; FERMIUM 258; SPONTANEOUS FISSION; MENDELEVIUM 259; MENDELEVIUM 260; NOBELIUM 258; ENERGY SPECTRA; EXPERIMENTAL DATA; HALF-LIFE; LIQUID DROP MODEL; MASS SPECTRA; MEV RANGE 100-1000; SHELL MODELS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; DATA; DECAY; ENERGY RANGE; EVEN-EVEN NUCLEI; FERMIUM ISOTOPES; FISSION; HEAVY NUCLEI; INFORMATION; ISOTOPES; MATHEMATICAL MODELS; MENDELEVIUM ISOTOPES; MEV RANGE; MICROSEC LIVING RADIOISOTOPES; NOBELIUM ISOTOPES; NUCLEAR MODELS; NUCLEAR REACTIONS; NUCLEI; NUMERICAL DATA; ODD-EVEN NUCLEI; ODD-ODD NUCLEI; RADIOISOTOPES; SPECTRA; 652026* - Nuclear Properties & Reactions, A=220 & above, Experimental- Spontaneous & Induced Fission- (-1987)

Citation Formats

Hulet, E K, Wild, J F, Dougan, R J, Lougheed, R W, Landrum, J H, Dougan, A D, Schadel, M, Hahn, R L, Baisden, P A, and Henderson, C M. Bimodal symmetric fission observed in the heaviest elements. United States: N. p., 1986. Web. doi:10.1103/PhysRevLett.56.313.
Hulet, E K, Wild, J F, Dougan, R J, Lougheed, R W, Landrum, J H, Dougan, A D, Schadel, M, Hahn, R L, Baisden, P A, & Henderson, C M. Bimodal symmetric fission observed in the heaviest elements. United States. https://doi.org/10.1103/PhysRevLett.56.313
Hulet, E K, Wild, J F, Dougan, R J, Lougheed, R W, Landrum, J H, Dougan, A D, Schadel, M, Hahn, R L, Baisden, P A, and Henderson, C M. 1986. "Bimodal symmetric fission observed in the heaviest elements". United States. https://doi.org/10.1103/PhysRevLett.56.313.
@article{osti_6095263,
title = {Bimodal symmetric fission observed in the heaviest elements},
author = {Hulet, E K and Wild, J F and Dougan, R J and Lougheed, R W and Landrum, J H and Dougan, A D and Schadel, M and Hahn, R L and Baisden, P A and Henderson, C M},
abstractNote = {We measured the mass and kinetic-energy partitioning in the spontaneous fission of /sup 258/Fm, /sup 259/Md, /sup 260/Md, /sup 258/No, and /sup 260/(104). All fissioned with mass distributions that were symmetric. Total-kinetic-energy distributions peaked near either 200 or 235 MeV. Surprisingly, these energy distributions were skewed upward or downward from the peak in each case, except for /sup 260/(104), indicating a composite of two energy distributions. We interpret this as a mixture of liquid-drop-like and fragment-shell directed symmetric fission, although theory had not anticipated this phenomenon.},
doi = {10.1103/PhysRevLett.56.313},
url = {https://www.osti.gov/biblio/6095263}, journal = {Phys. Rev. Lett.; (United States)},
number = ,
volume = 56:4,
place = {United States},
year = {Mon Jan 27 00:00:00 EST 1986},
month = {Mon Jan 27 00:00:00 EST 1986}
}