The competition between alpha decay and spontaneous fission in odd–even and odd–odd nuclei in the range 99≤Z≤12999≤Z≤129

The predictions on the mode of decay of the odd–even and odd–odd isotopes of heavy and superheavy nuclei with Z=99–129Z=99–129, in the range 228≤A≤336228≤A≤336, have been done within the Coulomb and proximity potential model for deformed nuclei (CPPMDN). A comparison of our calculated alpha half lives with the values computed using other theoretical models shows good agreement with each other. An extensive study on the spontaneous fission half lives of all the isotopes under study has been performed to identify the long-lived isotopes in the mass region. The study reveals that the alpha decay half lives and the mode of decay of the isotopes with Z=109Z=109, 111, 113, 115 and 117, evaluated using our formalisms, agree well with the experimental observations. As our study on the odd–even and odd–odd isotopes of Z=99–129Z=99–129 predicts that, the isotopes 238,240–25499, 244,246–258101, 248,250,252–260,262103, 254,256,258–262,264105, 258,260,262–264,266107, 262,264,266–274109, 266,268–279111, 270–284,286113, 272–289,291115, 274–299117, 276–307119, 281–314121, 287–320,322123, 295–325125, 302–327127 and 309–329129 survive fission and have alpha decay channel as the prominent mode of decay, these nuclei could possibly be synthesized in the laboratory and this could be of great interest to the experimentalists. The behavior of these nuclei against the proton decay has also been studied to identify the probable proton emitters in this region of nuclei.