Abstract
Fission product yields (FPYs) are an important source of information that are used for basic and applied physics. They are essential observables to address questions relevant to nucleosynthesis in the cosmos that created the elements from iron to uranium, for example, in energy generating processes from fission recycling in binary neutron star mergers; resolving the reactor neutrino anomaly; decay heat release in nuclear reactors; and many national security applications. While new applications will require accurate energy-dependent FPY data over a broad set of incident neutron energies, the current evaluated FPY data files contain only three energy points: thermal, fast, and 14-MeV incident energies.Recent measurements using mono-energetic and pulsed neutron beams at the Triangle Universities Nuclear Laboratory (TUNL) tandem accelerator and employing a dual fission ionization chambers setup have produced self-consistent, high-precision data critical for testing fission models for the neutron-induced fission of the major actinide nuclei. This paper will present new campaign just beginning utilizing a RApid Belt-driven Irradiated Target Transfer System (RABITTS) to measure shorter-lived fission products and the time dependence of fission yields, expanding the measurements from cumulative towards independent fission yields.
Highlights
Nuclear fission is a collective phenomenon in which a heavy parent nucleus splits into two daughter nuclei either spontaneously or as a result of induced fission
The distribution of fragment masses following fission is one of the most basic quantities that has been observed since the discovery of fission by Hahn and Strassmann in 1938, and these yields play an important role in many applications such as the estimation of decay heat and delayed neutron emission in nuclear reactors, reactor neutrino studies, radio isotope production for medical applications, development of advanced reactor and transmutation systems, fission in the galactic chemical evolution, national security, among others
We aim to extend our experimental capability of measuring not just the total chain yield Ych(A, Z), i.e. the last or the longest-lived radioactive member of the β-decay chain, but the energy dependency of the cumulative Yc(A, Z) and independent fission yields YI(A, Z) using monoenergetic neutron beams coupled with high-resolution γ-ray spectroscopy
Summary
Nuclear fission is a collective phenomenon in which a heavy parent nucleus splits into two daughter nuclei either spontaneously or as a result of induced fission. Due to the complexity of the fission phenomenon, the mechanism of mass distribution is not simple and has been a challenge for fission theory using microscopic or phenomenological concepts [1]. While new applications will require accurate energy-dependent FPY data over a broad range of incident neutron energies, the current evaluated FPY data files contain only three energy points: thermal, fast (∼2 MeV), and 14-MeV incident energies.
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