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Resonance state in 7H.

M Caamaño1, D Cortina-Gil, W Mittig

  • 1Department of Particle Physics, Universidade de Santiago de Compostela, E-15782, Santiago de Compostela, Spain. caamano@ganil.fr

Physical Review Letters
|October 13, 2007
PubMed
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Researchers confirmed the existence of the seven hydrogen (7H) nuclear system, a highly neutron-proton unbalanced system, using a one-proton transfer reaction. This discovery provides unambiguous proof of this exotic nuclear state.

Area of Science:

  • Nuclear Physics
  • Exotic Nuclear Systems
  • Nuclear Reactions

Background:

  • Investigating exotic nuclear systems pushes the boundaries of our understanding of nuclear forces.
  • The seven hydrogen (7H) system, with its extreme neutron-to-proton ratio, has been a subject of theoretical interest.
  • Previous experimental evidence for such highly asymmetric systems has been limited.

Purpose of the Study:

  • To experimentally investigate the existence of the seven hydrogen (7H) nuclear system.
  • To characterize the properties of the 7H system, including its resonance energy and width.
  • To confirm the formation of the most neutron-proton unbalanced system observed to date.

Main Methods:

  • Utilized a one-proton transfer reaction employing a helium-8 (8He) beam at 15.4A MeV.

Related Experiment Videos

  • Employed the active-target MAYA detector system for complete reaction kinematics reconstruction.
  • Analyzed experimental data to identify events corresponding to the formation of the 7H system.

    • Main Results:

    • Confirmed the existence of the 7H nuclear system through the identification of seven distinct events.
    • Determined the resonance energy of the 7H system to be 0.57 MeV above the 3H+4n threshold.
    • Measured the resonance width of the 7H system to be 0.09 MeV.

    Conclusions:

    • The study provides unambiguous experimental proof for the existence of the 7H nuclear system.
    • The 7H system represents the most neutron-proton unbalanced nuclear system discovered to date.
    • This finding contributes significantly to the understanding of nuclear stability limits and the behavior of exotic nuclei.