Study of the level structure of 62Ni

doi:10.1016/0375-9474(78)90437-2

Nuclear Physics A

Volume 308, Issues 1–2, 25 September–2 October 1978, Pages 14-26

https://doi.org/10.1016/0375-9474(78)90437-2 Get rights and content

Abstract

The properties of excited states in ₂₈⁶²Ni₃₄ populated by means of the ⁵⁹Co(α, pγ)⁶²Ni reaction were investigated. The Doppler-shift attenuation method was employed to determine the mean lives of 20 levels up to an excitation energy of 4151 keV. A comprehensive level and decay scheme is proposed. Detailed shell-model calculations have been made of the M1 and E2 transition matrix elements for depopulation of states which, when compared with experiment, do not support an interpretation based on an inert ₂₈⁵⁶Ni₂₈ core. This is strongly confirmed by use of this model spectroscopy in the analyses of inelastic proton scattering data to the 2₁⁺ and 3₁⁻ states in ⁶²Ni.

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An update of the B(E2) $↑$ evaluation for even–even Cr, Fe, Ni, and Zn nuclei is presented. It is a continuation of work by Raman et al. on B(E2) $↑$ values and was motivated by a large number of new measurements. It extends the previous evaluation from 20 to 38 nuclei and includes a comprehensive shell-model analysis. Evaluation policies for the analysis of experimental data are discussed. Future plans for a complete B(E2) $↑$ evaluation of even–even nuclei are outlined.
Nuclear Data Sheets for A = 62
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Experimental nuclear spectroscopic data for known nuclides of mass number 62 (Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn, Ga, Ge) have been evaluated and presented together with adopted properties of levels and γ rays. New high-spin data are available for ⁶²Ga, and ⁶²Zn. Results of in-beam γ-ray studies for ⁶²Cu producing high-spin states are in conflict in terms of gamma-ray placements and branching ratios. In the opinion of the evaluators, a detailed study of high-spin structures in ⁶²Cu is needed to obtain a consistent and confident level scheme. Precise studies of superallowed β decay of ⁶²Ga to ⁶²Zn by several groups have extended the decay scheme. No significant new data, since the 2000 NDS for A = 62 (2000Hu18), have been reported for ⁶²Co, ⁶²Ni and ⁶²Cu. No data are yet available for excited states in ⁶²Ti and ⁶²V, and those for ⁶²Cr and 62Ge are scarce. The level lifetime data are available in very few cases. The radioactive decay schemes of ⁶²Ti and ⁶²Ge are unknown, and those for ⁶²V, ⁶²Cr and 92-ms ⁶²Mn are scantily known. The data presented here supersede those in the earlier NDS publications.
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The lifetimes and lifetime limits of 14 states in ⁵⁴Cr up to an excitation energy of 4043 keV have been determined by means of the Doppler-shift attenuation method using the ⁵¹V(α, pγ) reaction. A limited-basis shell-model calculation without use of adjustable parameters has been made of the level spectroscopy and the transition matrix elements for depopulation of these states. These theoretical and experimental findings are compared in detail ; the predicted energy level spectrum is found to be in reasonable accord with experiment, while our calculated and measured level lifetimes are in good agreement with each other.
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^☆: Research supported in part by grants from the Australian Research Grants Committee.

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Nuclear Physics A

Abstract

References (23)

Nucl. Phys.

Nucl. Data Sheets

Nucl. Phys.

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Nucl. Phys.

Nucl. Phys.

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Phys. Rev.

Phys. Rev.

Cited by (6)

An update of the B(E2) evaluation for 0<inf>1</inf><sup>+</sup>→2<inf>1</inf><sup>+</sup> transitions in even-even nuclei near N~Z~28

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Level structure and lifetimes of low excitation states in <sup>54</sup>Cr

Search for shape-coexisting 0+ states in Ni 66 from lifetime measurements

Electric monopole transition strengths in <sup>62</sup>Ni

Status of vibrational structure in Ni62

Study of the level structure of 62Ni☆

Abstract

Nucl. Phys.

Nucl. Data Sheets

Nucl. Phys.

Nucl. Data

Nucl. Phys.

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Phys. Rev.

Phys. Rev.

Study of the level structure of ⁶²Ni☆