Direct mass measurements beyond the proton drip-line

C. Rauth; D. Ackermann; K. Blaum; M. Block; A. Chaudhuri; S. Eliseev; R. Ferrer; D. Habs; F. Herfurth; F. P. Hessberger; S. Hofmann; H. -J. Kluge; G. Maero; A. Martin; G. Marx; M. Mukherjee; J. B. Neumayr; W. R. Plass; W. Quint; S. Rahaman; D. Rodriguez; C. Scheidenberger; L. Schweikhard; P. G. Thirolf; G. Vorobjev; C. Weber; Z. Di

doi:10.1103/physrevlett.100.012501

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Direct mass measurements beyond the proton drip-line

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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.

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C. Rauth, D. Ackermann, K. Blaum, M. Block, A. Chaudhuri, S. Eliseev, R. Ferrer, D. Habs, F. Herfurth, F. P. Hessberger, S. Hofmann, H. -J. Kluge, G. Maero, A. Martin, G. Marx, M. Mukherjee, J. B. Neumayr, W. R. Plass, W. Quint, S. Rahaman, D. Rodriguez, C. Scheidenberger, L. Schweikhard, P. G. Thirolf, G. Vorobjev, C. Weber, Z. Di. 2007-01-22. Direct mass measurements beyond the proton drip-line. https://doi.org/10.1103/physrevlett.100.012501

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