Related Experiment Video
Updated: May 19, 2026

Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
Published on: May 3, 2019
Precision mass measurements beyond 132Sn: anomalous behavior of odd-even staggering of binding energies
J Hakala1, J Dobaczewski, D Gorelov
1Department of Physics, P.O. Box 35 (YFL), FI-40014 University of Jyväskylä, Finland. jani.hakala@phys.jyu.fi
Abstract:
Atomic masses of the neutron-rich isotopes (121-128)Cd, (129,131)In, (130-135)Sn, (131-136)Sb, and (132-140)Te have been measured with high precision (10 ppb) using the Penning-trap mass spectrometer JYFLTRAP. Among these, the masses of four r-process nuclei (135)Sn, (136)Sb, and (139,140)Te were measured for the first time. An empirical neutron pairing gap expressed as the odd-even staggering of isotopic masses shows a strong quenching across N = 82 for Sn, with a Z dependence that is unexplainable by the current theoretical models.
More Related Videos
Related Concept Videos
Nuclear Binding Energy
Nuclear Stability
To hold positively charged protons together in the...
Other Nuclides: 31P, 19F, 15N NMR
While fluorine-19 and phosphorous-31 have high natural abundances (100%) and positive gyromagnetic ratios, nitrogen-15 has a low natural abundance and a negative gyromagnetic ratio. However, nitrogen-15 is still preferred over nitrogen-14 (which has a high...
Mass Spectrometry: Isotope Effect
Atomic Nuclei: Nuclear Spin State Population Distribution
High-Resolution Mass Spectrometry (HRMS)

