The field of negative parity states is of about the same age as the one dealing with the positive parity states. The pioneering papers in this domain appeared already in the beginning of the fifties [ASP53, SAP55] of the last century and were based on high resolution alpha spectroscopy measurements. The states were identified as \(1^{-},\ 3^{-},\ 5^{-}\) through angular correlations and conversion coefficients analysis, as well as by measuring the E1 branching ratio for the first state to \(0^{+}\) and \(2^{+}\) .