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Equilateral-triangular shape in 14C.

N Itagaki1, T Otsuka, K Ikeda

  • 1Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan. itagaki@phys.s.u-tokyo.ac.jp

Physical Review Letters
|April 20, 2004
PubMed
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Researchers propose a 14C nuclear structure featuring three alpha clusters in an equilateral triangle, stabilized by neutrons. This model explains observed rotational bands, suggesting alpha crystallization in nuclear matter.

Area of Science:

  • Nuclear Physics
  • Quantum Chemistry
  • Atomic and Molecular Physics

Background:

  • The structure of light nuclei like Carbon-14 (14C) is complex and has been investigated using various nuclear models.
  • Understanding nuclear clustering phenomena is crucial for comprehending nuclear stability and reactions.

Purpose of the Study:

  • To propose a novel molecular-orbit model for the 14C nucleus.
  • To investigate the stabilizing role of excess neutrons on a proposed three-alpha cluster structure in 14C.
  • To explain the experimentally observed rotational bands in 14C.

Main Methods:

  • Application of the molecular-orbit model to describe the 14C nucleus.
  • Analysis of the attractive interactions between excess neutrons and alpha particles.

Related Experiment Videos

  • Theoretical prediction and comparison of rotational bands (K(pi)=0(+) and 3(-)) with experimental data.

    • Main Results:

    • A stable equilateral-triangular configuration of three alpha clusters in 14C is suggested.
    • Attractive neutron-alpha interactions stabilize predicted K(pi)=0(+) and 3(-) rotational bands.
    • The predicted K(pi)=3(-) band aligns with experimentally observed states near the 10Be+alpha threshold.

    Conclusions:

    • The proposed model provides a consistent explanation for the observed rotational bands in 14C.
    • The findings suggest a molecular three-alpha structure in 14C, stabilized by neutrons.
    • This structure represents a form of "alpha crystallization" within a dilute nuclear environment.