Isoscalar monopole excitations in ${}^{16}$O: $\alpha$-cluster states at low energy and mean-field-type states at higher energy

T. Yamada, Y. Funaki, T. Myo +5

Isoscalar monopole strength function in ${}^{16}$O up to $E_x\simeq 40$ MeV is discussed. We found that the fine structures at the low energy region up to $E_x\simeq 16$ MeV in t…