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.

doi:10.1038/s41586-020-2123-1

Title: Mirror-symmetry violation in bound nuclear ground states

Journal Article · Wed Apr 01 00:00:00 EDT 2020 · Nature (London)

DOI:https://doi.org/10.1038/s41586-020-2123-1· OSTI ID:1615744

^[1]; Rogers, A. M. ^[1];

^[2]; Bender, P. C. ^[1]; Brandenburg, K. ^[3]; Childers, K. ^[2]; Clark, J. A. ^[4]; Dombos, A. C. ^[2]; Doucet, E. R. ^[1]; Jin, S. ^[2]; Lewis, R. ^[2]; Liddick, S. N. ^[2]; Lister, C. J. ^[1]; Meisel, Z. ^[3]; Morse, C. ^[5];

^[2]; Schatz, H. ^[2]; Schmidt, K. ^[6]; Soltesz, D. ^[3]; Subedi, S. K. ^[3] more »

Univ. of Massachusetts, Lowell, MA (United States)
Michigan State Univ., East Lansing, MI (United States)
Ohio Univ., Athens, OH (United States)
Argonne National Lab. (ANL), Argonne, IL (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Massachusetts, Lowell, MA (United States)
TU Dresden (Germany); Michigan State Univ., East Lansing, MI (United States)

Conservation laws are deeply related to any symmetry present in a physical system. Analogously to electrons in atoms exhibiting spin symmetries, 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. Every nuclear state is thus characterized by a total isobaric spin T and a projection T_z—two quantities that are largely conserved in nuclear reactions and decays. 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 states, including their ground state, labelled by their total angular momentum J and parity π. In this work, 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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Research Organization:: Michigan State Univ., East Lansing, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); National Science Foundation (NSF)

Grant/Contract Number:: SC0013365; SC0008511; FG02-94ER40848; AC02-06CH11357; SC0018083; FG02-88ER40387; SC0019042; NA0003180; NA0000979; NA0003221; NA0003909; NA0002132; PHY-1-102511; PHY- 14-30152

OSTI ID:: 1615744

Journal Information:: Nature (London), Vol. 580, Issue 7801; ISSN 0028-0836

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 20 works

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