Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

H L Crawford¹, V Tripathi², J M Allmond³, B P Crider⁴, R Grzywacz⁵, S N Liddick^{6 7}, A Andalib^{6 8}, E Argo^{6 8}, C Benetti², S Bhattacharya², C M Campbell¹, M P Carpenter⁹, J Chan⁵, A Chester⁶, J Christie⁵, B R Clark⁴, I Cox⁵, A A Doetsch^{6 8}, J Dopfer^{6 8}, J G Duarte¹⁰, P Fallon¹, A Frotscher¹, T Gaballah⁴, T J Gray³, J T Harke¹⁰, J Heideman⁵, H Heugen⁵, R Jain^{6 8}, T T King³, N Kitamura⁵, K Kolos¹⁰, F G Kondev⁹, A Laminack³, B Longfellow¹⁰, R S Lubna⁶, S Luitel⁴, M Madurga⁵, R Mahajan⁶, M J Mogannam^{6 7}, C Morse¹¹, S Neupane⁵, A Nowicki⁵, T H Ogunbeku^{4 6}, W-J Ong¹⁰, C Porzio¹, C J Prokop¹², B C Rasco³, E K Ronning^{6 7}, E Rubino⁶, T J Ruland¹³, K P Rykaczewski³, L Schaedig^{6 8}, D Seweryniak⁹, K Siegl⁵, M Singh⁵, S L Tabor², T L Tang², T Wheeler^{6 8}, J A Winger⁴, Z Xu⁵

Affiliations

¹ Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
² Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
³ Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁴ Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA.
⁵ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.
⁶ Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA.
⁷ Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
⁸ Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
⁹ Argonne National Laboratory, Argonne, Illinois 60439, USA.
¹⁰ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
¹¹ Brookhaven National Laboratory, Upton, New York 11973, USA.
¹² Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
¹³ Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

PMID:36461950
DOI: 10.1103/PhysRevLett.129.212501

Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

H L Crawford et al. Phys Rev Lett.2022.

.2022 Nov 18;129(21):212501.

doi: 10.1103/PhysRevLett.129.212501.

Authors

Affiliations

¹ Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA.
² Department of Physics, Florida State University, Tallahassee, Florida 32306, USA.
³ Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
⁴ Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA.
⁵ Department of Physics and Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.
⁶ Facility for Rare Isotope Beams, Michigan State University, East Lansing, Michigan 48824, USA.
⁷ Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
⁸ Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
⁹ Argonne National Laboratory, Argonne, Illinois 60439, USA.
¹⁰ Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
¹¹ Brookhaven National Laboratory, Upton, New York 11973, USA.
¹² Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
¹³ Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA.

PMID:36461950
DOI: 10.1103/PhysRevLett.129.212501

Abstract

New half-lives for exotic isotopes approaching the neutron drip-line in the vicinity of N∼28 for Z=12-15 were measured at the Facility for Rare Isotope Beams (FRIB) with the FRIB decay station initiator. The first experimental results are compared to the latest quasiparticle random phase approximation and shell-model calculations. Overall, the measured half-lives are consistent with the available theoretical descriptions and suggest a well-developed region of deformation below ^{48}Ca in the N=28 isotones. The erosion of the Z=14 subshell closure in Si is experimentally confirmed at N=28, and a reduction in the ^{38}Mg half-life is observed as compared with its isotopic neighbors, which does not seem to be predicted well based on the decay energy and deformation trends. This highlights the need for both additional data in this very exotic region, and for more advanced theoretical efforts.

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Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

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Crossing N=28 Toward the Neutron Drip Line: First Measurement of Half-Lives at FRIB

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Abstract

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