Disintegration of Iron-52 and Iron-53

Juliano, Jose O.; Kocher, Claudine; Nainan, T. D.; Mitchell, Allan C. G.

doi:10.1103/physrev.113.602

Cited by 32 publications

(3 citation statements)

References 10 publications

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“…The yields of Co 62 , Co 63 , and Fe 62 should be smaller than the cross sections of the copper and nickel isotopes mentioned above by more than one order of magnitude, for copper, 740±20 mb, is about 40% higher, which seems to be outside the error of the present treatment. The difference could possibly be accounted for by attributing a high cross section to inelastic scattering processes, leaving the target nucleus with so low excitation energy that neutron evaporation is impossible.…”

Section: Total Cross Section For Spallationmentioning

confidence: 85%

Spallation of Copper with 24-Gev Protons

1962

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Section: Total Cross Section For Spallationmentioning

confidence: 85%

Spallation of Copper with 24-Gev Protons

1962

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“…The 52 Mn nucleus, the mirror of 52 Co, has a 2 + isomeric state at 378 keV above the 6 + ground state. This 52 Mn isomer, having a half-life of 21.1(2) min [9,10], decays via two branches, 98.22 (5)% by β + decay to 52 Cr and 1.78 (5)% via an internal transition to the ground state [10,11]. Assuming isospin symmetry, a 2 + isomeric state is also expected in 52 Co at a similar energy.…”

Section: Introductionmentioning

confidence: 90%

Observation of the 2+ isomer in Co52

et al. 2016

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We report the first observation of the 2 + isomer in 52 Co, produced in the β decay of the 0 + , 52 Ni ground state. We have observed three γ-rays at 849, 1910, and 5185 keV characterizing the β deexcitation of the isomer. We have measured a half-life of 102(6) ms for the isomeric state. The Fermi and Gamow-Teller transition strengths for the β decay of 52m Co to 52 Fe have been determined. We also add new information on the β decay of the 6 + , 52 Co ground state, for which we have measured a half-life of 112(3) ms.

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“…A number of high-lying (presumed 1 + ) proton decaying states have been established [25] as well as three states of J π = 0 + , 1 + , 2 + connected by gamma decays [22,25] -left side of Fig. 1(a) [26]) which decays predominately via β-decay [27]. Recently, the beta-decay of the 2 + isomer in 52 Co has been observed [24], with a half life of 102(6) ms.…”

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confidence: 99%

Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

et al. 2016

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One-neutron knockout reactions have been performed on a beam of radioactive 53 Co in a high-spin isomeric state. The analysis is shown to yield highly-selective population of high-spin states in an exotic nucleus with a significant cross section, and hence represents a technique that is applicable to the planned new generation of fragmentation-based radioactive beam facilities. Additionally, the relative cross sections among the excited states can be predicted to a high level of accuracy when reliable shell-model input is available. The work has resulted in a new level scheme, up to the 11 + band-termination state, of the proton-rich nucleus 52 Co (Z = 27, N = 25). This has in turn enabled a study of mirror energy differences in the A = 52 odd-odd mirror nuclei, interpreted in terms of isospin-non-conserving (INC) forces in nuclei. The analysis demonstrates the importance of using a full set of J-dependent INC terms to explain the experimental observations.Isospin symmetry arises from the near identical nature of the strong nuclear interaction regardless of which nucleons are involved (e.g. [1]). Under this assumption, and in the absence of electromagnetic effects, the proton and neutron can be considered as two states of the same particle, the nucleon. Heisenberg [2] assigned an isospin quantum number, t = 1 2 for a nucleon, with projection t z = − 1 2 (+ 1 2 ) for the proton(neutron), respectively. For nuclei, therefore, we expect to find isobaric analogue states (IAS), of a given isospin T , in a set of nuclei with T z (= (N − Z)/2) = −T → +T which. In the absence of isospin-breaking terms (such as the electromagnetic interaction), these IAS would be identical and degenerate. In reality, any isospin-breaking interactions will lift this degeneracy, and hence the differences in behaviour between IAS yields direct information on these interactions. Given that the Coulomb interaction is well understood, this has the potential to shed light on how isospin-breaking effects of nuclear origin manifest in nuclei, which is the long-term goal of this study. Mirror energy differences (MED), defined as M ED α = E * α,T,Tz=−1 − E * α,T,Tz=+1 , where α denotes a state label and E * is excitation energy), can yield important information on two-body interactions of the form V pp − V nn that must be used in conjunction with the Coulomb interaction to provide a good theoretical description -see for example [3][4][5][6][7]. These studies have raised fundamental questions about the influence of isovector interactions in nuclear structure. In this Letter, we present a new high-spin study of the odd-odd nucleus 52 Co (Z = 27), the proton-rich member of the T = 1 mirror pair 52 Co/ 52 Mn, using a novel technique to access high-spin states in this exotic system.

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Disintegration of Iron-52 and Iron-53

Cited by 32 publications

References 10 publications

Spallation of Copper with 24-Gev Protons

Spallation of Copper with 24-Gev Protons

Observation of the 2+ isomer in Co52

Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

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