Theoretical predictions forα-decay chains ofZ=119isotopes in the region274≤A≤313

Abstract

An extensive study on the \ensuremath{\alpha}-decay half-life for the isotopes of $Z$ = 119 superheavy nuclei in the range 274 \ensuremath{\le} $A$ \ensuremath{\le} 313 is performed within the Coulomb and proximity potential model for deformed nuclei (CPPMDN). We have also evaluated the decay properties by keeping the parents and daughter in spherical nuclear shape (without including the nuclear deformations), within the Coulomb and proximity potential model (CPPM). The half-life calculations are also performed by using the Viola-Seborg semi-empirical (VSS) relation, very frequently used for \ensuremath{\alpha}-decay studies, and it can be seen that our predictions agree well with the computed VSS values. Our intention to understand the mode of decay of the isotopes was fulfilled through the spontaneous fission (SF) half-life calculations and the comparison of the \ensuremath{\alpha} half-lives with the SF half-lives. Thus, our study reveals that those isotopes of $Z$ = 119 with $A$ \ensuremath{\ge} 309 and with $A$ \ensuremath{\le} 275 do not survive fission, and thus, the \ensuremath{\alpha} decay is restricted within the range of 276 \ensuremath{\le} $A$ \ensuremath{\le} 308. Through our study, we have predicted six consistent \ensuremath{\alpha} chains from ${}^{292--295}$119, five consistent \ensuremath{\alpha} chains from ${}^{296}$119, four consistent \ensuremath{\alpha} chains from ${}^{297}$119, and three consistent \ensuremath{\alpha} chains from ${}^{298,299}$119, and we hope these findings will provide a new guide for future experiments. A theoretical study is performed here to understand the mode of decay of the isotopes of $Z$ = 119, which helps to identify the mode of decay of about 40 isotopes within the range of 274 \ensuremath{\le} $A$ \ensuremath{\le} 313.