Direct mass measurements beyond the proton drip-line

Abstract

First on-line mass measurements were performed at the SHIPTRAP Penning trap mass spectrometer. The masses of 18 neutron-deficient isotopes in the terbium-to-thulium region produced in fusion-evaporation reactions were determined with relative uncertainties of about $7\cdot 10^{-8}$, nine of them for the first time. Four nuclides (${}^{144,145}$Ho and ${}^{147,148}$Tm) were found to be proton-unbound. The implication of the results on the location of the proton drip-line is discussed by analyzing the one-proton separation energies.

References in corpus (4)

• Nuclear Ground-State Masses and Deformations
• The endpoint of the rp process on accreting neutron stars
• Systematics of proton emission
• The History of Nuclidic Masses and of their Evaluation

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