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

Leistenschneider, E.; Dunling, E.; Bollen, G.; Brown, B. A.; Dilling, J.; Hamaker, A.; Holt, J. D.; Jacobs, A.; Kwiatkowski, A. A.; Miyagi, T.; Porter, W. S.; Puentes, D.; Redshaw, M.; Reiter, M. P.; Ringle, R.; Sandler, R.; Sumithrarachchi, C. S.; Valverde, A. A.; Yandow, I. T.

doi:10.1103/physrevlett.126.042501

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

Journal Article · Tue Jan 26 00:00:00 EST 2021 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.126.042501· OSTI ID:1827197

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^[2]; Bollen, G. ^[1]; Brown, B. A. ^[1]; Dilling, J. ^[3];

^[1]; Holt, J. D. ^[4]; Jacobs, A. ^[3]; Kwiatkowski, A. A. ^[5];

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^[3];

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^[1]; Sandler, R. ^[9]; Sumithrarachchi, C. S. ^[1]; Valverde, A. A. ^[10]; Yandow, I. T. ^[1]

Michigan State Univ., East Lansing, MI (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of York (United Kingdom)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); McGill Univ., Montreal, QC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
TRIUMF, Vancouver, BC (Canada)
Central Michigan Univ., Mount Pleasant, MI (United States); Michigan State Univ., East Lansing, MI (United States)
TRIUMF, Vancouver, BC (Canada); Justus-Liebig Univ., Giessen (Germany); Univ. of Edinburgh, Scotland (United Kingdom)
Central Michigan Univ., Mount Pleasant, MI (United States)
Univ. of Manitoba, Winnipeg, MB (Canada)

In this work, 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.

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Research Organization:: Michigan State Univ., East Lansing, MI (United States); Central Michigan Univ., Mount Pleasant, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF); Natural Sciences and Engineering Research Council of Canada (NSERC); German Federal Ministry of Education and Research (BMBF)

Contributing Organization:: The LEBIT Collaboration and the TITAN Collaboration

Grant/Contract Number:: SC0015927; NA0003180

OSTI ID:: 1827197

Alternate ID(s):: OSTI ID: 1830616; OSTI ID: 1985493

Journal Information:: Physical Review Letters, Vol. 126, Issue 4; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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