Eur. Phys. J. A (2000) 8: 307-329
https://doi.org/10.1007/s100500070085

Accurate masses of unstable rare-earth isotopes by ISOLTRAP

¹ GSI, D-64291, Darmstadt, Germany
² Institut für Physik, Universität Mainz, D-55099, Mainz, Germany
³ CSNSM-IN2P3-CNRS, F-91405, Orsay-Campus, France
⁴ CERN, CH-1211, Geneva, Switzerland
⁵ Instituto de Estructura de la Materia, CSIC, Madrid, Spain
⁶ Foster Radiation Laboratory, McGill University, Montreal, H3A 2B1, Canada
⁷ Institute of Experimental Physics, Warsaw-University, PL-00681, Warsaw, Poland

^* e-mail: dietrich.beck@fys.kuleuven.ac.be

Received: 18 April 2000
Accepted: 5 July 2000
Published online: 15 September 2000

Abstract

Direct mass measurements of neutron-deficient rare-earth isotopes in the vicinity of ¹⁴⁶Gd were performed with the Penning trap mass spectrometer ISOLTRAP at ISOLDE/CERN. This paper reports on the measurement of more than 40 isotopes of the elements praseodymium, neodymium, promethium, samarium, europium, dysprosium and holmium, that have been measured with a typical accuracy of δm ≈ 14 keV. An atomic mass evaluation has been performed taking into account other experimental mass values via a least-squares adjustment. The results of the adjustment are discussed.