First Observation of Unbound O11, the Mirror of the Halo Nucleus Li11

Webb, T. B.; Wang, S. M.; Brown, K. W.; Charity, R. J.; Elson, J. M.; Barney, J.; Cerizza, G.; Chajecki, Z.; Estee, J.; Hoff, D. E. M.; Kuvin, S. A.; Lynch, W. G.; Manfredi, J.; McNeel, D.; Morfouace, P.; Nazarewicz, W.; Pruitt, C. D.; Santamaria, C.; Smith, J.; Sobotka, L. G.; Sweany, S.; Tsang, C. Y.; Tsang, M. B.; Wuosmaa, A. H.; Zhang, Y.; Zhu, K.

doi:10.1103/physrevlett.122.122501

First Observation of Unbound ${}^{11}O$ , the Mirror of the Halo Nucleus ${}^{11}{Li}$

Journal Article · Fri Mar 29 04:00:00 EDT 2019 · Physical Review Letters

DOI:https://doi.org/10.1103/physrevlett.122.122501· OSTI ID:1609529

Webb, T. B. ^[1]; Wang, S. M. ^[2]; Brown, K. W. ^[2]; Charity, R. J. ^[3]; Elson, J. M. ^[3]; Barney, J. ^[2]; Cerizza, G. ^[2]; Chajecki, Z. ^[4]; Estee, J. ^[2]; Hoff, D. E. M. ^[3]; Kuvin, S. A. ^[5]; Lynch, W. G. ^[2]; Manfredi, J. ^[2]; McNeel, D. ^[5]; Morfouace, P. ^[2]; Nazarewicz, W. ^[2]; Pruitt, C. D. ^[3]; Santamaria, C. ^[2]; Smith, J. ^[5]; Sobotka, L. G. ^[3] more »

Washington Univ., St. Louis, MO (United States); DOE/OSTI
Michigan State Univ., East Lansing, MI (United States)
Washington Univ., St. Louis, MO (United States)
Western Michigan Univ., Kalamazoo MI (United States)
Univ. of Connecticut, Storrs, CT (United States)

The structure of the extremely proton-rich nucleus

{{}_{8}^{11}O}_{3}

, the mirror of the two-neutron halo nucleus

{}_{3}^{11}{Li}_{8}

, has been studied experimentally for the first time. Following two-neutron knockout reactions with a

{}_{13}O

beam, the

{}_{11}O

decay products were detected after two-proton emission and used to construct an invariant-mass spectrum. A broad peak of width

~ 3.4 MeV

was determined. Within the Gamow coupled-channel approach, it was concluded that this peak is a multiplet with contributions from the four lowest

{}_{11}O

resonant states:

J^{π} = 3 / 2_{1}^{-}

3 / 2_{2}^{-}

5 / 2_{1}^{+}

, and

5 / 2_{2}^{+}

. The widths and configurations of these states show strong, nonmonotonic dependencies on the depth of the

p

{}_{9}C

potential. This unusual behavior is due to the presence of a broad threshold resonant state in

{}_{10}N

, which is an analog of the virtual state in

{}_{10}{Li}

in the presence of the Coulomb potential. After optimizing the model to the data, only a moderate isospin asymmetry between ground states of

{}_{11}O

and

{}_{11}{Li}

was discovered.

View Accepted Manuscript (DOE)

Research Organization:: Western Michigan Univ., Kalamazoo MI (United States); Washington Univ., St. Louis, MO (United States); Krell Institute, Ames, IA (United States); Texas A & M Univ., Commerce, TX (United States); Michigan State Univ., East Lansing, MI (United States); Univ. of Connecticut, Storrs, CT (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA): National Science Foundation (NSF); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: FG02-04ER41320; FG02-87ER40316; NA0002135; SC0009971; SC0013365; SC0014552; SC0018083

OSTI ID:: 1609529

Alternate ID(s):: OSTI ID: 1504529

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 12 Vol. 122; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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