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NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
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Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.
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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Shape Coexistence at Zero Spin in ^{64}Ni Driven by the Monopole Tensor Interaction.

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Area of Science:

  • Nuclear Physics
  • Atomic and Molecular Physics

Background:

  • The low-spin structure of the semimagic ^{64}Ni nucleus is crucial for understanding nuclear shell evolution.
  • Previous studies have provided limited information on the excited states below 4.5 MeV.

Purpose of the Study:

  • To experimentally identify and characterize new low-spin excited states in ^{64}Ni.
  • To investigate the coexistence of nuclear shapes and the influence of shell effects.

Main Methods:

  • Combining data from four distinct experiments.
  • Spectroscopic analysis to establish properties of excited states.
  • Application of the Monte Carlo shell model for theoretical interpretation.

Main Results:

  • Several new 0^{+} and 2^{+} excited states were identified below 4.5 MeV.
  • A prolate 0^{+} excited state was observed at 3463 keV, with a collective 2^{+} state 286 keV above it.
  • The Monte Carlo shell model successfully reproduced the experimental findings, revealing complex coexisting shapes.

Conclusions:

  • The ^{64}Ni nucleus exhibits a surprisingly complex landscape of coexisting shapes.
  • The evolution of the prolate minimum across the N=40 subshell gap is significantly influenced by monopole interactions.
  • This study provides the first observation of a collective 2^{+} state associated with a prolate minimum in Ni isotopes.