Abstract
.High-precision mass measurements of stable and beta-decaying nuclides 52-57Cr, 55Mn, 56,59Fe, 59Co, 75, 77-79Ga, and the lanthanide nuclides 140Ce, 140Nd, 160Yb, 168Lu, 178Yb have been performed with the Penning-trap mass spectrometer ISOLTRAP at ISOLDE/CERN. The new data are entered into the Atomic Mass Evaluation and improve the accuracy of masses along the valley of stability, strengthening the so-called backbone. The mass of neutron-deficient 168Lu in its isomeric state has been measured directly. The mass of neutron-rich 178Yb indicates a change of nuclear structure approaching the double harmonic-oscillator shell closure for Z=70 and N=112.
Highlights
The mass reflects all the interactions at work in the nucleus through the nuclear binding energy [1]
The results show that the new masses of the chromium isotopes are systematically smaller than the values in AME2012 by 1–3 keV
The masses of 20 stable and short-lived nuclides have been measured by the Penning-trap mass spectrometer ISOLTRAP with precisions of a few keV
Summary
The mass reflects all the interactions at work in the nucleus through the nuclear binding energy [1]. Masses are important benchmarks for many nuclear models and can be measured either indirectly, via decays and reactions, or directly as mass doublets with respect to a well-known reference. Data from these different methods are combined within the Atomic Mass Evaluation (AME) [2] that employs a least-squares adjustment procedure of all input data and generates a table of atomic masses. Masses are a unique characteristic of the nucleus and form a surface with astonishing regularity (see series of graphs in the AME [2]). Since the AME integrates all available data, it gives important hints as to where potential problems might arise
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