Direct mass measurements of 19B, 22C, 29F, 31Ne, 34Na and other light exotic nuclei

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 $\nu 2s_{1/2}^2$ configuration, and a single-neutron halo in ${}^{31}$Ne with the valence neutron occupying predominantly the 2$p_{3/2}$ orbital. Despite a very low two-neutron separation energy the development of a halo in ${}^{19}$B is hindered by the 1$d_{5/2}^2$ character of the valence neutrons.

arXiv comment5 pages

References in corpus (7)

• Three-body forces and the limit of oxygen isotopes
• Quantum Monte Carlo calculations of A=8 nuclei
• Determination of the structure of ${}^{31}$Ne by full-microscopic framework
• Probing the weakly-bound neutron orbit of ${}^{31}$Ne with total reaction and one-neutron removal cross sections
• Interpretation of Coulomb breakup of 31Ne in terms of deformation
• Ab-initio computation of neutron-rich oxygen isotopes
• Gamow shell-model calculations of drip-line oxygen isotopes

Cited by in corpus (55)

• Current Status of r-Process Nucleosynthesis
• Isotopic chains around oxygen from evolved chiral two- and three-nucleon interactions
• Recent development of complex scaling method for many-body resonances and continua in light nuclei
• Shrunk halo and quenched shell gap at $N=16$ in ${}^{22}$C: Inversion of $sd$ states and deformation effects
• A two-neutron halo is unveiled in ${}^{29}$F
• Chiral three-nucleon forces and the evolution of correlations along the oxygen isotopic chain
• Study of ground state properties of carbon isotopes with deformed relativistic Hartree-Bogoliubov theory in continuum
• Ab initio Gamow in-medium similarity renormalization group with resonance and continuum
• Extending the Southern Shore of the Island of Inversion to ${}^{28}$F
• Search for ${}^{21}$C and constraints on ${}^{22}$C
• Two-neutron halo structure of ${}^{31}$F
• Examination of the ${}^{22}$C radius determination with interaction cross sections
• First observation of 20B and 21B
• Modeling ${}^{19}$B as a ${}^{17}$B-n-n three-body system in the unitary limit
• Time-of-flight mass measurements of neutron-rich chromium isotopes up to N = 40 and implications for the accreted neutron star crust
• Electric dipole response of low-lying excitations in the two-neutron halo nucleus ${}^{29}$F
• Extinction of the N=20 neutron-shell closure for 32Mg examined by direct mass measurements
• Toward precision mass measurements of neutron-rich nuclei relevant to $r$-process nucleosynthesis
• Exploring two-neutron halo formation in the ground-state of ${}^{29}$F within a three-body model
• Description of proton-rich nuclei in the $A\sim 20$ region with the Gamow shell model
• The ${}^{29}$F nucleus as a lighthouse on the coast of the island of inversion
• Recent progress in configuration-interaction shell model
• Coulomb breakup of ${}^{37}$Mg and its ground state structure
• Examining the $N$ = 28 shell closure through high-precision mass measurements of ${}^{46-48}$Ar
• Intermediate energy four-body breakup calculations for 22C
• Density matrix renormalization group description of the island of inversion isotopes ${}^{28-33}$F
• Calculation of the Thomas-Ehrman shift in ${}^{16}$F and ${}^{15}$O(p,p) cross section with the Gamow shell model
• Elastic Coulomb breakup of ${}^{34}$Na
• Three-body structure of ${}^{19}$B: Finite-range effects in two-neutron halo nuclei
• Investigation of spectroscopic factors of deeply-bound nucleons in drip-line nuclei with the Gamow shell model
• Mean-field analysis of ground state and low-lying electric dipole strength in ${}^{22}$C
• Exploring the halo character and dipole response in the dripline nucleus ${}^{31}$F
• Role of quadrupole deformation and continuum effects in the "island of inversion'' nuclei ${}^{28,29,31}$F
• Low-lying dipole strengths for probable $p$-wave one-neutron halos in the medium mass region
• Coulomb breakup of 22C in a four-body model
• One-neutron halo structure of ${}^{29}$Ne
• Core momentum distribution in two-neutron halo nuclei
• Two-neutron correlations in a Borromean ${}^{20}\mathrm{C}+n+n$ system: Sensitivity of unbound subsystems
• Many-body Propagator Theory with Three-Body Interactions: a Path to Exotic Open Shell Isotopes
• Structure and Coulomb dissociation of 23O within the quark-meson coupling model
• Scaling of the ${}^{19}$B two-neutron halo properties close to unitarity
• Structural effects of ${}^{34}$Na in the ${}^{33}$Na(n,$\gamma {)}^{34}$Na radiative capture reaction
• Deformed Halo of ^{29}_{9}F_{20}
• Nuclear Mass Measurements With Radioactive Ion Beams
• Mapping the frontiers of the nuclear mass surface
• Structure of odd-mass Ne, Na, and Mg nuclei
• Structure of 29F in the Rotation-aligned Coupling Scheme of the Particle-Rotor Model
• Properties of Lithium-11 and Carbon-22 at leading order in halo effective field theory
• Novel feature of doubly bubble nuclei in 50$\le$Z(N)$\le$82 region along with magicity and weakly bound structure
• Deformation, halo, and bubble structure: A paradigm shift of exotic phenomena in light to medium mass nuclei
• Scaling limit analysis of Borromean halos
• Resonances of unbound quantum many-body systems of nuclei
• Three-body Description of $2n$-Halo and Unbound $2n$-Systems: ${}^{22}$C and ${}^{26}$O
• A novel theoretical approach for the study of resonances in weakly bound systems
• Scaling with deformation in probable $p$-wave halo ${}^{34}$Na