Abstract
\ensuremath{\alpha} groups and \ensuremath{\gamma}-ray transitions have been observed from nuclides produced in the bombardment of $^{40}\mathrm{Ca}$ with $^{127}\mathrm{I}$. Two weak \ensuremath{\alpha} groups were assigned to $^{162,163}\mathrm{Ta}$ based on their measured half-lives and excitation functions. With an unambiguous assignment of these two \ensuremath{\alpha} groups the absolute masses of nuclides in two long \ensuremath{\alpha} chains, for which $^{162,163}\mathrm{Ta}$ form links, can now be deduced with confidence. Absolute masses are thus obtained for some nuclides very far from stability, including ones that are not bound against ground-state proton emission. The simultaneous observation of \ensuremath{\alpha} groups and \ensuremath{\gamma} rays from other nuclides produced in this bombardment also permitted the determination of the upper limits of six new \ensuremath{\alpha} branching ratios.
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