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We study the resonance spectroscopy of the proton-rich nucleus 8C in thealpha+p+p+p+p cluster model. Many-body resonances are treated on the correctboundary condition as the Gamow states using the complex scaling method. Weobtain the ground state of 8C as a five-body resonance for the first time,which has dominantly the sub-closed (p_{3/2})^4 configuration and agrees withthe recent experiment for energy and decay width. We predict the second 0+state with the excitation energy of 5.6 MeV, which corresponds to the $2p2h$state from the ground state. We evaluate the occupation numbers of fourvalence-protons in the 8C states and also the J^\pi distribution of proton-pairnumbers of the two 0+ states of 8C. The ground state involves a large amount ofthe 2+ proton-pair fraction, while the excited 0+_2 state almost consists oftwo of the 0+ proton pairs, which can be understood from the(p_{3/2})^2(p_{1/2})^2 configuration. We also discuss the mirror symmetrybetween 8C and 8He with an alpha+four nucleon picture. It is found that the 0+states retain the mirror symmetry well for the configuration properties of twonuclei.

Five-body resonances of 8C using the complex scaling method