$α$ cluster states in $^{44, 46, 52}$Ti

Abstract

α decaying states of 44,46,52 Ti were investigated with angular correlation functions between t and α with the 40,42,48 Ca( 7 Li, tα) 40,42,48 Ca reactions at E = 26.0 MeV. Many α cluster states were newly observed in the 10 -15 MeV excitation energy of 44 Ti and their spin-parities were assigned, in which J π = 7 − state was found at 11.95 MeV as a candidate for the member of the K = 0 − 1 negative parity band. In 46 Ti many α cluster states were also found in the 11 -17 MeV excitation energy with the 42 Ca( 7 Li, tα) 42 Ca reaction, though its strength is weak compared to 44 Ti. No α cluster states were detected for the 48 Ca( 7 Li, tα) 48 Ca reaction, in which the number of coincidence events decaying from 48 Ca was very small.