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Mirror-symmetry violation in bound nuclear ground states.
Hoff, D E M; Rogers, A M; Wang, S M; Bender, P C; Brandenburg, K; Childers, K; Clark, J A; Dombos, A C; Doucet, E R; Jin, S; Lewis, R; Liddick, S N; Lister, C J; Meisel, Z; Morse, C; Nazarewicz, W; Schatz, H; Schmidt, K; Soltesz, D; Subedi, S K; Waniganeththi, S.
Afiliação
  • Hoff DEM; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA, USA. dan@demhoff.com.
  • Rogers AM; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA, USA. Andrew_Rogers@uml.edu.
  • Wang SM; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • Bender PC; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA, USA.
  • Brandenburg K; Department of Physics and Astronomy, Ohio University, Athens, OH, USA.
  • Childers K; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • Clark JA; Department of Chemistry, Michigan State University, East Lansing, MI, USA.
  • Dombos AC; Physics Division, Argonne National Laboratory, Argonne, IL, USA.
  • Doucet ER; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • Jin S; Department of Physics and Astronomy, Michigan State University, East Lansing, MI, USA.
  • Lewis R; JINA-CEE, Michigan State University, East Lansing, MI, USA.
  • Liddick SN; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA, USA.
  • Lister CJ; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • Meisel Z; JINA-CEE, Michigan State University, East Lansing, MI, USA.
  • Morse C; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • Nazarewicz W; Department of Chemistry, Michigan State University, East Lansing, MI, USA.
  • Schatz H; National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, MI, USA.
  • Schmidt K; Department of Chemistry, Michigan State University, East Lansing, MI, USA.
  • Soltesz D; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA, USA.
  • Subedi SK; Department of Physics and Astronomy, Ohio University, Athens, OH, USA.
  • Waniganeththi S; Department of Physics and Applied Physics, University of Massachusetts Lowell, Lowell, MA, USA.
Nature ; 580(7801): 52-55, 2020 04.
Article em En | MEDLINE | ID: mdl-32238942
ABSTRACT
Conservation laws are deeply related to any symmetry present in a physical system1,2. Analogously to electrons in atoms exhibiting spin symmetries3, it is possible to consider neutrons and protons in the atomic nucleus as projections of a single fermion with an isobaric spin (isospin) of t = 1/2 (ref. 4). Every nuclear state is thus characterized by a total isobaric spin T and a projection Tz-two quantities that are largely conserved in nuclear reactions and decays5,6. A mirror symmetry emerges from this isobaric-spin formalism nuclei with exchanged numbers of neutrons and protons, known as mirror nuclei, should have an identical set of states7, including their ground state, labelled by their total angular momentum J and parity π. Here we report evidence of mirror-symmetry violation in bound nuclear ground states within the mirror partners strontium-73 and bromine-73. We find that a J π = 5/2- spin assignment is needed to explain the proton-emission pattern observed from the T = 3/2 isobaric-analogue state in rubidium-73, which is identical to the ground state of strontium-73. Therefore the ground state of strontium-73 must differ from its J π = 1/2- mirror bromine-73. This observation offers insights into charge-symmetry-breaking forces acting in atomic nuclei.
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2020 Tipo de documento: Article
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Texto completo: 1 Base de dados: MEDLINE Idioma: En Ano de publicação: 2020 Tipo de documento: Article