2D spectrum displaying the correlation between energies of mom and daughter α decays within the response of 36Ar+176Hf. Credit: Yang Huabin
A analysis staff on the Institute of Modern Physics (IMP) of the Chinese Academy of Sciences (CAS), along with their collaborators, has just lately synthesized a brand new isotope thorium-207, and found an everyday and distinct odd-even staggering (OES) in α-decay energies for nuclei with Z>82 and NPhysical Review C on May 19.
The experiment to provide thorium-207 was carried out on the Heavy Ion Research Facility in Lanzhou (HIRFL), China. The isotope was separated in flight by the gas-filled recoil separator Spectrometer for Heavy Atoms and Nuclear Structure, and recognized on the premise of a correlated α-decay chain. The α decay of thorium-207, measured with an α-particle vitality of 8167(21) keV and a half-life of 9.7(+46.6-4.4) ms, was assigned to originate from floor state. The new isotope thorium-207 is the thirty fourth nuclide synthesized at IMP.
Combining the brand new measurements with present knowledge, the researchers obtained direct proof that there’s a common and distinct OES in α-decay energies for nuclei with Z>82 and N
The OES in α-decay energies. Credit: Yang Huabin
In order to probe the underlying mechanism of the OES in α-decay energies, they carried out the relativistic Hartree-Fock-Bogoliubo and large-scale shell-model calculations. They discovered that the OES originates from each pairing correlations and blocking of specific orbitals by unpaired nucleons.
This research reveals a novel mechanism of odd-even staggering induced by pairing scattering and presents a problem to nuclear-mass fashions.
Scientists report outstanding enhancement of α-particle clustering in uranium isotopes
More info:
H. B. Yang et al, New isotope 207Th and odd-even staggering in α -decay energies for nuclei with Z>82 and NPhysical Review C (2022). DOI: 10.1103/PhysRevC.105.L051302
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Chinese Academy of Sciences
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Researchers uncover new isotope thorium-207 and odd-even staggering in α-decay energies (2022, May 25)
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