Mirror symmetry at far edges of stability: The cases of <math><mmultiscripts><mi mathvariant="normal">C</mi><mprescripts/><none/><mn>8</mn></mmultiscripts></math> and <math><mmultiscripts><mi>He</mi><mprescripts/><none/><mn>8</mn></mmultiscripts></math> - Archive ouverte HAL Access content directly
Journal Articles Phys.Rev.C Year : 2024

Mirror symmetry at far edges of stability: The cases of C8 and He8

D Suzuki
  • Function : Author
T Abe
  • Function : Author
N Kitamura
  • Function : Author
M Niikura
  • Function : Author
H Otsu
  • Function : Author
T.Y Saito
  • Function : Author
H Sakurai
  • Function : Author

Abstract

Missing mass spectroscopy of the unbound C8 nucleus was performed by the one-neutron transfer C9(p,d)C8 reaction at 55 MeV/nucleon. Besides the known ground state, two new resonant states were observed, the first at an excitation energy of 3.40(25) MeV with a width of 3.0(5) MeV, the second at 18.6(5) MeV with a width of 3.9(11) MeV. Spin and parity Jπ=2+ were assigned to the first resonance from the distorted-wave Born approximation analysis of the experimental differential cross section. The excitation energy of the 2+ resonance in C8 supports the persistence of the subshell closure at the semimagic number Z = 6, as is the case for N = 6. The mirror energy difference relative to the 2+ state in He8, ΔEx=0.14(25) MeV, is compatible with zero. Both states represent resonances in the continuum, unbound by about 1.4 and 6.9 MeV, respectively, above the particle thresholds. A simple theoretical model emphasizes the difference in unboundedness to account for a symmetry in mirror energies. This unique system is expected to provide a salient test of theoretical models, which include the treatment of the continuum.
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Dates and versions

hal-04493960 , version 1 (07-03-2024)

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S Koyama, D Suzuki, M Assié, L Lalanne, O Sorlin, et al.. Mirror symmetry at far edges of stability: The cases of C8 and He8. Phys.Rev.C, 2024, 109 (3), pp.L031301. ⟨10.1103/PhysRevC.109.L031301⟩. ⟨hal-04493960⟩
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