Assuming isospin T is a good quantum number, the analog states of the low-lying states in Tz = ±(T0+1) nuclei can be found as excited T0+1 states in Tz = ±T0 nuclei. Therefore, if T0 + 1 states are identified in the excited region of Tz = ±T0 nuclei, the structure of unstable nuclei with Tz = ±(T0 + 1) can be deduced. We measured and compared the transition strengths to pairs of excited analog states in inelastic and charge-exchange reactions on the same target nucleus. The T values of these analog states were identified by using the fact that the transition strengths to them are different depending on T. The identification of T = 1/2 and 3/2 nature of analog MI and GT states in the mirror nuclei pair 27Al and 27Si is reported by comparing the transition strengths in high-resolution 27Al(p,p′) and 27Al(3He, t)27Si reactions at 0°. The identified T = 3/2 states are analogous to the low-lying states of 27Mg, which plays an important role in rp-process of nucleosynthesis.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)