Alpha energy distribution as a probe for the feeding of ND and SD bands in $^{151,152}$Dy nuclei

The study of the α-particle energy distributions associated with ND and SD states in 151,152Dy has been carried out. The Dy isotopes were produced in the reaction 37Cl +123Sb at 191 MeV via the (α5n) and (α4n) channels, respectively. In 151Dy the α-particle energy distributions associated to ND and SD are very different from each other, both at the low and high energy sides inducing a difference of 3 MeV in the α-particle mean energy. In 152Dy the situation is different; the α-particle spectral shapes are similar and a difference in the α-particle mean energy of only 0.7 MeV is deduced. A description in terms of energy localization of entry states is given.