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Advanced theoretical calculations predict rather complex properties of the excitation 0.+ 20.21 MeV α particle state with coupling between three binary cluster configurations.Credit: Nicolas Michel
Alpha particles, also known as helium-4, consist of two protons and two neutrons. Although it is one of the most extensively studied atomic nuclei, the exact nature of its excited states remains unclear.
Recent experimental work on the first excited state (labeled 0) of helium-4+2 The scientists’ study sparks new debate because of major discrepancies between experimental data and theoretical predictions.
To better understand the nature of this state, Professor Nicolas Michel of the Institute of Modern Physics (IMP) of the Chinese Academy of Sciences (CAS) and his collaborators employed a coreless Gamow shell model to structure the resonance structure. researched. 0+2 Helium-4 status. The research content is published in physical review letter It was highlighted as a “Special Feature on Physics” article.
0+2 The helium-4 state is debonded by about 410 keV. This is because he is a single proton emitter, but it has a very short lifetime. 0+2 Resonance has traditionally been viewed as either a breathing mode or as a particle hole excitation of the ground state of helium-4.
Michel and his collaborators have provided a new explanation for 0.+2 Helium-4 status. They predicted a fairly complex structure for 0.+2 Resonance showing strong continuous coupling between different damped channels.
Continuum coupling was found to have a strong influence on the nature of this proton-emitting state, giving the best agreement with experimental data for the monopole shape factor at the experimental energies.
The researchers found that 0+2 This condition should not be seen as a respiratory oscillation or an excitation of particle holes, but, on the contrary, as a broad resonance tuned to a threshold.
For more information:
N. Michel et al., Explanation of proton decay 0+2 resonance of alpha particles, physical review letter (2023). DOI: 10.1103/PhysRevLett.131.242502
