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The t+n+n system and 5H.

M Meister1, L V Chulkov, H Simon

  • 1Fysiska Institutionen, Chalmers Tekniska Högskolaoch Göteborgs Universitet, S-412 96 Göteborg, Sweden.

Physical Review Letters
|November 13, 2003
PubMed
Summary

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This summary is machine-generated.

Researchers investigated the one-proton knockout from Helium-6, observing a resonance in the resulting Hydrogen-5 nucleus. This study reveals neutrons occupying the p shell, offering new insights into nuclear structure.

Area of Science:

  • Nuclear Physics
  • Exotic Nuclei Research
  • Quantum Mechanics

Background:

  • Understanding the structure of exotic nuclei like Helium-6 is crucial for nuclear physics.
  • The properties of Hydrogen-5, a highly unstable isotope, are not well-established.
  • One-proton knockout reactions are a key method for probing nuclear structure.

Purpose of the Study:

  • To investigate the one-proton knockout channel from Helium-6.
  • To characterize the resonance state of the Hydrogen-5 nucleus.
  • To determine the neutron shell occupancy in the Hydrogen-5 system.

Main Methods:

  • Utilized a 240 MeV/u beam of Helium-6 impinging on a carbon target.
  • Detected triton fragments in coincidence with two neutrons.

Related Experiment Videos

  • Analyzed relative energy spectra, angular correlations, and energy correlations.

    • Main Results:

    • Observed a broad resonance structure peaked at 3 MeV above the triton + 2 neutrons threshold.
    • Identified this structure as primarily a 1/2(+) resonance, consistent with the expected ground state of Hydrogen-5.
    • Angular and energy correlations indicated significant neutron occupancy in the p shell.

    Conclusions:

    • The study provides evidence for the 1/2(+) resonance in Hydrogen-5.
    • The findings suggest that neutrons in Hydrogen-5 largely occupy the p shell.
    • Novel use of angular and energy correlations advanced the study of Hydrogen-5.