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Unbound states in 17C and p-sd shell-model interactions

Sunji KimJongwon HwangYoshiteru Satou ...+41 Ken-ichiro Yoneda
Dec 2022
摘要
Unbound states in 17C were investigated via one-neutron removal from a 18Cbeam at an energy of 245 MeV/nucleon on a carbon target. The energy spectrum of17C, above the single-neutron decay threshold, was reconstructed usinginvariant mass spectroscopy from the measured momenta of the 16C fragment andneutron, and was found to exhibit resonances at Er=0.52(2), 0.77(2), 1.36(1),1.91(1), 2.22(3) and 3.20(1) MeV. The resonance at Er=0.77(2) MeV [Ex=1.51(3)MeV] was provisionally assigned as the second 5/2+ state. The two resonances atEr=1.91(1) and 3.20(1) MeV [Ex=2.65(2) and 3.94(2) MeV] were identified,through comparison of the energies, cross sections and momentum distributionswith shell-model and eikonal reaction calculations, as p-shell hole states withspin-parities 1/2- and 3/2-, respectively. A detailed comparison was made withthe results obtained using a range of shell-model interactions. The YSOXshell-model Hamiltonian, the cross-shell part of which is based on themonopole-based universal interaction, was found to provide a very gooddescription of the present results and those for the neighbouring odd-A carbonisotopes - in particular for the negative parity cross-shell states.
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