One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55

M. Spieker; A. Gade; D. Weisshaar; B. A. Brown; J. A. Tostevin; B. Longfellow; P. Adrich; D. Bazin; M. A. Bentley; J. R. Brown; C. M. Campbell; C. Aa Diget; B. Elman; T. Glasmacher; M. Hill; B. Pritychenko; A. Ratkiewicz; D. Rhodes

doi:10.1103/PhysRevC.99.051304

One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55

M. Spieker, A. Gade, D. Weisshaar, B. A. Brown, J. A. Tostevin, B. Longfellow, P. Adrich, D. Bazin, M. A. Bentley, J. R. Brown, C. M. Campbell, C. Aa Diget, B. Elman, T. Glasmacher, M. Hill, B. Pritychenko, A. Ratkiewicz, D. Rhodes

Physics

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Abstract

We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei Co55 and Ni55 following one-nucleon knockout from a projectile beam of Ni56. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2- states in the A=55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/21+ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in Co55 than in its mirror Ni55.

Original language	English
Article number	051304
Number of pages	7
Journal	Physical Review C
Volume	99
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.99.051304
Publication status	Published - 22 May 2019

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PhysRevC.99.051304
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Spieker, M., Gade, A., Weisshaar, D., Brown, B. A., Tostevin, J. A., Longfellow, B., Adrich, P., Bazin, D., Bentley, M. A., Brown, J. R., Campbell, C. M., Diget, C. A., Elman, B., Glasmacher, T., Hill, M., Pritychenko, B., Ratkiewicz, A., & Rhodes, D. (2019). One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55. Physical Review C, 99(5), Article 051304. https://doi.org/10.1103/PhysRevC.99.051304

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title = "One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55",

abstract = "We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei Co55 and Ni55 following one-nucleon knockout from a projectile beam of Ni56. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2- states in the A=55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/21+ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in Co55 than in its mirror Ni55.",

author = "M. Spieker and A. Gade and D. Weisshaar and Brown, {B. A.} and Tostevin, {J. A.} and B. Longfellow and P. Adrich and D. Bazin and Bentley, {M. A.} and Brown, {J. R.} and Campbell, {C. M.} and Diget, {C. Aa} and B. Elman and T. Glasmacher and M. Hill and B. Pritychenko and A. Ratkiewicz and D. Rhodes",

note = "{\textcopyright}2019 American Physical Society. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details",

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doi = "10.1103/PhysRevC.99.051304",

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Spieker, M, Gade, A, Weisshaar, D, Brown, BA, Tostevin, JA, Longfellow, B, Adrich, P, Bazin, D, Bentley, MA, Brown, JR, Campbell, CM, Diget, CA, Elman, B, Glasmacher, T, Hill, M, Pritychenko, B, Ratkiewicz, A & Rhodes, D 2019, 'One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55', Physical Review C, vol. 99, no. 5, 051304. https://doi.org/10.1103/PhysRevC.99.051304

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T1 - One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55

AU - Spieker, M.

AU - Gade, A.

AU - Weisshaar, D.

AU - Brown, B. A.

AU - Tostevin, J. A.

AU - Longfellow, B.

AU - Adrich, P.

AU - Bazin, D.

AU - Bentley, M. A.

AU - Brown, J. R.

AU - Campbell, C. M.

AU - Diget, C. Aa

AU - Elman, B.

AU - Glasmacher, T.

AU - Hill, M.

AU - Pritychenko, B.

AU - Ratkiewicz, A.

AU - Rhodes, D.

PY - 2019/5/22

Y1 - 2019/5/22

N2 - We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei Co55 and Ni55 following one-nucleon knockout from a projectile beam of Ni56. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2- states in the A=55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/21+ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in Co55 than in its mirror Ni55.

AB - We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei Co55 and Ni55 following one-nucleon knockout from a projectile beam of Ni56. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2- states in the A=55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/21+ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in Co55 than in its mirror Ni55.

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SN - 2469-9985

VL - 99

JO - Physical Review C

JF - Physical Review C

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One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55

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