Related Experiment Video
Updated: May 16, 2026

Mapping Absolute DNA Density in Cell Nuclei using Single-molecule Localization Microscopy
Published on: November 11, 2025
Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei
L Gaudefroy1, W Mittig, N A Orr
1GANIL, CEA/DSM-CNRS/IN2P3, BP 55027, F-14076 Caen, France. laurent.gaudefroy@cea.fr
Abstract:
We report on direct time-of-flight based mass measurements of 16 light neutron-rich nuclei. These include the first determination of the masses of the Borromean drip-line nuclei (19)B, (22)C, and (29)F as well as that of (34)Na. In addition, the most precise determinations to date for (23)N and (31)Ne are reported. Coupled with recent interaction cross-section measurements, the present results support the occurrence of a two-neutron halo in (22)C, with a dominant ν2s(1/2)(2) configuration, and a single-neutron halo in (31)Ne with the valence neutron occupying predominantly the 2p(3/2) orbital. Despite a very low two-neutron separation energy the development of a halo in (19)B is hindered by the 1d(5/2)(2) character of the valence neutrons.
Related Concept Videos
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...
High-Resolution Mass Spectrometry (HRMS)
Atomic Mass
Mass Spectrometry: Isotope Effect
Atomic Nuclei: Larmor Precession Frequency
Mass Analyzers: Overview

