Eur. Phys. J. A (2011) 47: 129
https://doi.org/10.1140/epja/i2011-11129-9

Regular Article - Experimental Physics

Precision mass measurements of neutron-rich Y, Nb, Mo, Tc, Ru, Rh, and Pd isotopes

¹ Department of Physics, University of Jyväskylä, Jyväskylä, P.O. B. 35 (YFL), FI-40014, Finland
² CSIC, Instituto de Estructura de la Materia, Serrano 123, E-28006, Madrid, Spain

^* e-mail: jani.j.hakala@jyu.fi

Received: 28 June 2011
Revised: 19 September 2011
Accepted: 29 September 2011
Published online: 25 October 2011

Abstract

Direct mass measurements with typical uncertainties of 1-10keV have been performed for the first time for ten neutron-rich isotopes ^{102, 103}Y , ¹⁰⁸Nb , ¹¹¹Mo , ^{113, 114}Tc , ¹¹⁶Ru , ¹¹⁹Rh , and ^{121, 122}Pd . The obtained mass data compared with the 2003 atomic-mass evaluation shows systematic overestimation of binding energies far from stability. The relationship between two-neutron separation energies, nuclear structure and shape changes has been investigated by comparing the experimental data with a theoretical calculation based on the Hartree-Fock-Bogoliubov approximation using modern energy density functionals.