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First Observation of the Four-Proton Unbound Nucleus
Jin, Y; Niu, C Y; Brown, K W; Li, Z H; Hua, H; Anthony, A K; Barney, J; Charity, R J; Crosby, J; Dell'Aquila, D; Elson, J M; Estee, J; Ghazali, M; Jhang, G; Li, J G; Lynch, W G; Michel, N; Sobotka, L G; Sweany, S; Teh, F C E; Thomas, A; Tsang, C Y; Tsang, M B; Wang, S M; Wu, H Y; Yuan, C X; Zhu, K.
Afiliación
  • Jin Y; School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
  • Niu CY; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Brown KW; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Li ZH; Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
  • Hua H; School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
  • Anthony AK; School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
  • Barney J; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Charity RJ; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  • Crosby J; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Dell'Aquila D; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  • Elson JM; Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA.
  • Estee J; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Ghazali M; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  • Jhang G; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Li JG; Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA.
  • Lynch WG; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Michel N; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  • Sobotka LG; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Sweany S; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  • Teh FCE; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Thomas A; School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
  • Tsang CY; Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
  • Tsang MB; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
  • Wang SM; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA.
  • Wu HY; Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA.
  • Yuan CX; Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.
  • Zhu K; School of Nuclear Science and Technology, University of Chinese Academy of Sciences, Beijing 100049, China.
Phys Rev Lett ; 127(26): 262502, 2021 Dec 24.
Article en En | MEDLINE | ID: mdl-35029460
ABSTRACT
^{18}Mg was observed, for the first time, by the invariant-mass reconstruction of ^{14}O+4p events. The ground-state decay energy and width are E_{T}=4.865(34) MeV and Γ=115(100) keV, respectively. The observed momentum correlations between the five particles are consistent with two sequential steps of prompt 2p decay passing through the ground state of ^{16}Ne. The invariant-mass spectrum also provides evidence for an excited state at an excitation energy of 1.84(14) MeV, which is likely the first excited 2^{+} state. As this energy exceeds that for the 2^{+} state in ^{20}Mg, this observation provides an argument for the demise of the N=8 shell closure in nuclei far from stability. However, in open systems this classical argument for shell strength is compromised by Thomas-Ehrman shifts.
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Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2021 Tipo del documento: Article País de afiliación: China
Texto completo
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Banco de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2021 Tipo del documento: Article País de afiliación: China