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Direct Determination of Fission-Barrier Heights Using Light-Ion Transfer in Inverse Kinematics.

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Researchers developed a new method to measure nuclear fission data, essential for understanding heavy element origins in astrophysics and improving nuclear energy applications. This technique successfully determined the fission barrier height of Uranium-239.

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Area of Science:

  • Nuclear Physics
  • Nuclear Astrophysics
  • Nuclear Energy Applications

Background:

  • Fission data for nuclei far from beta stability are crucial for understanding the astrophysical r-process, which forms heavy elements.
  • Such data are vital for developing predictive models of nuclear fission and for terrestrial applications in power generation and safeguarding.
  • Experimental data in this area are scarce due to challenges in producing actinide targets.

Purpose of the Study:

  • To demonstrate a novel technique for acquiring fission data for nuclei away from beta stability.
  • To apply this technique to determine the fission barrier height of ^{239}U.
  • To validate the technique by comparing results with existing fission data.

Main Methods:

  • Utilized the solenoidal-spectrometer technique, typically used for nucleon-transfer reactions in inverse kinematics.
  • Adapted the technique for transfer-induced fission studies.
  • Investigated the ^{238}U(d,pf) reaction in inverse kinematics to deduce fission barrier height.

Main Results:

  • Successfully determined the fission barrier height of ^{239}U using the new technique.
  • The obtained fission barrier height is consistent with existing neutron-induced fission data.
  • This consistency validates the efficacy of the solenoidal-spectrometer technique for transfer-induced fission studies.

Conclusions:

  • The demonstrated solenoidal-spectrometer technique provides a viable method for obtaining scarce fission data.
  • This advancement aids in understanding heavy element nucleosynthesis and improving nuclear technologies.
  • The technique's validity is confirmed by its successful application to ^{239}U.