Unbound states in were investigated via one-neutron removal from a beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of , above the single-neutron decay threshold, was reconstructed using invariant mass spectroscopy from the measured momenta of the fragment and neutron, and was found to exhibit resonances at =0.52(2), 0.77(2), 1.36(1), 1.91(1), 2.22(3) and 3.20(1) MeV. The resonance at =0.77(2) MeV [=1.51(3) MeV] was provisionally assigned as the second state. The two resonances at =1.91(1) and 3.20(1) MeV [=2.65(2) and 3.94(2) MeV] were identified, through comparison of the energies, cross sections and momentum distributions with shell-model and eikonal reaction calculations, as p-shell hole states with spin-parities and , respectively. A detailed comparison was made with the results obtained using a range of shell-model interactions. The YSOX shell-model Hamiltonian, the cross-shell part of which is based on the monopole-based universal interaction, was found to provide a very good description of the present results and those for the neighbouring odd-A carbon isotopes – in particular for the negative parity cross-shell states.
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"value": "Unbound states in <math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>17</mn></mrow></mmultiscripts></math> were investigated via one-neutron removal from a <math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>18</mn></mrow></mmultiscripts></math> beam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of <math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>17</mn></mrow></mmultiscripts></math>, above the single-neutron decay threshold, was reconstructed using invariant mass spectroscopy from the measured momenta of the <math><mmultiscripts><mrow><mi>C</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>16</mn></mrow></mmultiscripts></math> fragment and neutron, and was found to exhibit resonances at <math><msub><mrow><mi>E</mi></mrow><mrow><mtext>r</mtext></mrow></msub></math>=0.52(2), 0.77(2), 1.36(1), 1.91(1), 2.22(3) and 3.20(1) MeV. The resonance at <math><msub><mrow><mi>E</mi></mrow><mrow><mtext>r</mtext></mrow></msub></math>=0.77(2) MeV [<math><msub><mrow><mi>E</mi></mrow><mrow><mi>x</mi></mrow></msub></math>=1.51(3) MeV] was provisionally assigned as the second <math><mn>5</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></math> state. The two resonances at <math><msub><mrow><mi>E</mi></mrow><mrow><mtext>r</mtext></mrow></msub></math>=1.91(1) and 3.20(1) MeV [<math><msub><mrow><mi>E</mi></mrow><mrow><mi>x</mi></mrow></msub></math>=2.65(2) and 3.94(2) MeV] were identified, through comparison of the energies, cross sections and momentum distributions with shell-model and eikonal reaction calculations, as p-shell hole states with spin-parities <math><mn>1</mn><mo>/</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>\u2212</mo></mrow></msubsup></math> and <math><mn>3</mn><mo>/</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mn>1</mn></mrow><mrow><mo>\u2212</mo></mrow></msubsup></math>, respectively. A detailed comparison was made with the results obtained using a range of shell-model interactions. The YSOX shell-model Hamiltonian, the cross-shell part of which is based on the monopole-based universal interaction, was found to provide a very good description of the present results and those for the neighbouring odd-A carbon isotopes \u2013 in particular for the negative parity cross-shell states."
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