The 1g92 analogue state in 55Co

Martin, D.J.; McLatchie, W.; Robertson, B.C.; Szücs, J.

doi:10.1016/0375-9474(76)90534-0

Cited by 21 publications

(5 citation statements)

References 18 publications

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“…Relevant to this work, strong isospin mixing between the T = 3/2, J π = 3/2 − IAS of 55 Cu and a very close-lying T = 1/2, J π = 3/2 − state was observed in a β-decay experiment leading to 55 Ni [42]. Very similar observations had been made in the 1970s for the IAS of 55 Fe in the mirror nucleus 55 Co [28,29,43]. The recent β-decay data on 55 Ni hint at slightly stronger isospin mixing in 55 Co [42] as compared to the earlier work mentioned above.…”

supporting

confidence: 82%

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55
Spieker
¹
,
Gade
²
,
Weißhaar
³

et al. 2019
Phys. Rev. C
13
0
7
0
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Article:Spieker, M., Gade, A., Weisshaar, D. et al. (15 more authors) (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. 051304.We present a high-resolution in-beam γ -ray spectroscopy study of excited states in the mirror nuclei 55 Co and 55 Ni following one-nucleon knockout from a projectile beam of 56 Ni. 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 E 1 decays from the 1/2 + 1 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 E 1 decay pattern, however, points at stronger mixing between the two lowest 3/2 − states in 55 Co than in its mirror 55 Ni.

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supporting

confidence: 82%

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55
Spieker
¹
,
Gade
²
,
Weißhaar
³

et al. 2019
Phys. Rev. C
13
0
7
0
View full text Add to dashboard Cite

show abstract

“…Relevant for this work, strong isospin mixing between the T = 3/2, J π = 3/2 − IAS of 55 Cu and a very closelying T = 1/2, J π = 3/2 − state was observed in a βdecay experiment leading to 55 Ni [42]. Very similar observations had been made in the 1970s for the IAS of 55 Fe in the mirror nucleus 55 Co [28,29,43]. The recent β-decay data on 55 Ni hint at slightly stronger isospin mixing in 55 Co [42] as compared to the earlier work mentioned above.…”

supporting

confidence: 78%

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

Spieker,

Gade,

Weisshaar

et al. 2019

Preprint

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We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei 55 Co and 55 Ni following one-nucleon knockout from a projectile beam of 56 Ni. 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 1/2 + 1 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 55 Co than in its mirror 55 Ni.

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“…In the energy region of the present experiment the states at 2166 and 2566keV in "CO have been identified as the anti-analogue states corresponding to the ground state analogues of "Fe at 4721 and 4748 keV [ 15,361. In the higher energy region the 8468 and 6068 keV states in "CO have been interpreted as the analogue and anti-analogue of the 3.81 MeV, J" = 912' state in "Fe [8]. Thus the observed energy differences between the analogue and anti-analogue states are 2.2, 2.6, and 2.4MeV, respectively, and the anti-analogue states in " C O are to be expected at energies 2-3 MeV below the analogue states.…”

Section: Q-valuementioning

confidence: 99%

“…"CO is an attractive nucleus because of its structure, which lacks one proton of the doubly closed-shell configuration N = Z = 28. Consequently it has received considerable experimental [1][2][3][4][5][6][7][8][9][10][11][12][13] and theoretical [14][15][16][17] attention in recent years and a substantial amount of information for "CO has been gathered. Nevertheless, our knowledge of the properties of the levels of "CO is limited: for instance, the y-decay properties, spins and parities of many relatively low-lying levels are not known.…”

Section: Introductionmentioning

confidence: 99%

Investigation of⁵⁵Co Levels with the⁵⁴Fe (p, γ)⁵⁵Co Reaction I. Excitation and Decay Properties of Resonances

Hänninen

Din

1980

Phys. Scr.

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The nucleus 55C0 has been studied through the reaction 54Fe(p, Y ) ~~C O . The yield curve has been measured in the proton energy range 0.80-2.37 MeV. The resonance bombarding energies and the corresponding "CO excitation energies of 46 resonances are reported. The Q-value of the reaction has been determined to be 5064.2 f 0.4 keV. The excitation energies of 34 levels below 5.6 MeV, fed by the resonance states, have been deduced. The gamma-decay of 29 resonances and of the 34 excited states below 5.6 MeV have been investigated, including 1 7 resonances and nine excited states for which the branching ratios are reported for the first time. Based on the new branching ratios, the revised resonance strength values of 2.6 t 0.4 and 1.2 t. 0.2 eV are given for the E, = 1722 and 1887 keV standard resonances, respectively. The relative strengths have been determined for 28 resonances. Using the present resonance strengths and branching ratios the transition probabilities of primary transitions from 14 resonance states have been calculated, including two observed analogue to analogue transitions.

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The 1g92 analogue state in 55Co

Cited by 21 publications

References 18 publications

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55
Spieker
¹
,
Gade
²
,
Weißhaar
³

et al. 2019
Phys. Rev. C
13
0
7
0
View full text Add to dashboard Cite

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55
Spieker
¹
,
Gade
²
,
Weißhaar
³

et al. 2019
Phys. Rev. C
13
0
7
0
View full text Add to dashboard Cite

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

Investigation of⁵⁵Co Levels with the⁵⁴Fe (p, γ)⁵⁵Co Reaction I. Excitation and Decay Properties of Resonances

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The 1g92 analogue state in 55Co

Cited by 21 publications

References 18 publications

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55Spieker1, Gade2, Weißhaar3 et al. 2019Phys. Rev. C13070View full textAdd to dashboardCite

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55Spieker1, Gade2, Weißhaar3 et al. 2019Phys. Rev. C13070View full textAdd to dashboardCite

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

Investigation of55Co Levels with the54Fe (p, γ)55Co Reaction I. Excitation and Decay Properties of Resonances

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One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55
Spieker
¹
,
Gade
²
,
Weißhaar
³

et al. 2019
Phys. Rev. C
13
0
7
0
View full text Add to dashboard Cite

One-proton and one-neutron knockout reactions from N=Z=28Ni56 to the A=55
Spieker
¹
,
Gade
²
,
Weißhaar
³

et al. 2019
Phys. Rev. C
13
0
7
0
View full text Add to dashboard Cite

Investigation of⁵⁵Co Levels with the⁵⁴Fe (p, γ)⁵⁵Co Reaction I. Excitation and Decay Properties of Resonances