# Alpha decay of nuclei interesting for synthesis of $Z=119, 120$ isotopes

## TL;DR

This paper calculates alpha decay half-lives for super-heavy nuclei relevant to synthesizing elements 119 and 120, comparing models and predicting decay modes to guide experimental detection.

## Contribution

It evaluates four different models for alpha decay half-lives and predicts possible cluster radioactivity in super-heavy nuclei, aiding experimental efforts.

## Key findings

- AKRA, ASAF, UNIV, semFIS models provide decay half-life estimates.
- Predicted branching ratios suggest detectable cluster radioactivity.
- Comparison with experimental and theoretical masses enhances prediction accuracy.

## Abstract

Four groups (even-even, even-odd, odd-even and odd-odd) of heavy and super-heavy nuclei are of interest for the synthesis of the isotopes with $Z=119, 120$. We report calculations of $\alpha$~decay half-lives using four models: AKRA (Akrawy); ASAF (Analytical Super-Asymmetric Fission); UNIV (Universal Formula), and semFIS (Semi-empirical formula based on Fission Theory). We compare the experimental $Q_\alpha$ values either with AME16 atomic mass evaluation (whenever available) and with the theoretical model WS4, able to give masses of not yet measured nuclides. For $^{92,94}$Sr cluster radioactivity of $^{300,302}$120 we predict a branching ratio relative to $\alpha$~decay of -0.10 and 0.49, respectively, meaning that it is worth trying to detect such kind of decay modes in competition with $\alpha$~decay.