Precision Mass Measurements of Neutron-Rich Scandium Isotopes Refine the Evolution of N=32 and N=34 Shell Closures

The LEBIT Collaboration, The TITAN Collaboration

Research output: Contribution to journalArticlepeer-review

Abstract

We report high-precision mass measurements of 50–55Sc isotopes performed at the LEBIT facility at NSCL and at the TITAN facility at TRIUMF. Our results provide a substantial reduction of their uncertainties and indicate significant deviations, up to 0.7 MeV, from the previously recommended mass values for 53–55Sc. The results of this work provide an important update to the description of emerging closed-shell phenomena at neutron numbers N=32 and N=34 above proton-magic Z=20. In particular, they finally enable a complete and precise characterization of the trends in ground state binding energies along the N=32 isotone, confirming that the empirical neutron shell gap energies peak at the doubly magic 52Ca. Moreover, our data, combined with other recent measurements, do not support the existence of a closed neutron shell in 55Sc at N=34. The results were compared to predictions from both ab initio and phenomenological nuclear theories, which all had success describing N=32 neutron shell gap energies but were highly disparate in the description of the N=34 isotone.
Original languageEnglish
Article number042501
Pages (from-to)1-7
Number of pages7
JournalPhysical Review Letters
Volume126
Issue number4
Early online date26 Jan 2021
DOIs
Publication statusPublished - 29 Jan 2021

Keywords

  • nucl-ex

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