Exploring the fission barrier of U-235
In this work we have revisited the shape isomer in 235U. Re-analyzing data from a previous experiment gave a half-life of T1=2 = (11 +- 3) ms and a cross section for populating the isomer of sigma_iso = (12 +- 1) microbarn. Combining these new results with measured properties of fission fragments from the reaction 234U(n, f) allowed extracting parameters describing the outer fission barrier. The deduced barrier parameters are EB = (5.7 +- 0.6) MeV and hbar-omegaB = (0.5 +-0.1) MeV for the height and curvature, respectively, as well as the energy of the super-deformed ground state EII = (2.4 +- 0.6) MeV. Separate barrier parameters for the standard-1 and standard-2 fission modes have been estimated, too. Finally, the results obtained in this work have been successfully tested for their plausibility.
OBERSTEDT Andreas;
OBERSTEDT Stephan;
2021-09-02
AMER PHYSICAL SOC
JRC124717
2469-9985 (online),
https://journals.aps.org/prc/abstract/10.1103/PhysRevC.104.024611,
https://publications.jrc.ec.europa.eu/repository/handle/JRC124717,
10.1103/PhysRevC.104.024611 (online),
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