The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear forces and many-body physics than excitation energies alone. We report the first lifetime measurement of excited states in $^{21}$O, finding ps. This result together with the deduced level scheme and branching ratio of several γ-ray decays are compared to both phenomenological shell-model and ab initio calculations based on two- and three-nucleon forces derived from chiral effective field theory. We find that the electric quadrupole reduced transition probability of e$^{2}$fm$^{4}$, derived from the lifetime of the state, is smaller than the phenomenological result where standard effective charges are employed, suggesting the need for modifications of the latter in neutron-rich oxygen isotopes. We compare this result to both large-space and valence-space ab initio calculations, and by using multiple input interactions we explore the sensitivity of this observable to underlying details of nuclear forces.
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"value": "The structure of exotic nuclei provides valuable tests for state-of-the-art nuclear theory. In particular electromagnetic transition rates are more sensitive to aspects of nuclear forces and many-body physics than excitation energies alone. We report the first lifetime measurement of excited states in $^{21}$O, finding <math><msub><mrow><mi>\u03c4</mi></mrow><mrow><mn>1</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></mrow></msub><mo>=</mo><msubsup><mrow><mn>420</mn></mrow><mrow><mo>\u2212</mo><mn>32</mn></mrow><mrow><mo>+</mo><mn>35</mn></mrow></msubsup><msubsup><mrow><mtext>(stat)</mtext></mrow><mrow><mo>\u2212</mo><mn>12</mn></mrow><mrow><mo>+</mo><mn>34</mn></mrow></msubsup><mtext>(sys)</mtext></math> ps. This result together with the deduced level scheme and branching ratio of several \u03b3-ray decays are compared to both phenomenological shell-model and ab initio calculations based on two- and three-nucleon forces derived from chiral effective field theory. We find that the electric quadrupole reduced transition probability of <math><mi>B</mi><mo>(</mo><mi>E</mi><mn>2</mn><mo>;</mo><mn>1</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup><mo>\u2192</mo><mn>5</mn><mo>/</mo><msubsup><mrow><mn>2</mn></mrow><mrow><mrow><mi>g</mi><mo>.</mo><mi>s</mi></mrow><mo>.</mo></mrow><mrow><mo>+</mo></mrow></msubsup><mo>)</mo><mo>=</mo><msubsup><mrow><mn>0.71</mn></mrow><mrow><mo>\u2212</mo><mn>0.06</mn><mspace width=\"0.25em\"></mspace><mo>\u2212</mo><mn>0.06</mn></mrow><mrow><mo>+</mo><mn>0.07</mn><mspace width=\"0.25em\"></mspace><mo>+</mo><mn>0.02</mn></mrow></msubsup></math> e$^{2}$fm$^{4}$, derived from the lifetime of the <math><mn>1</mn><mo>/</mo><msup><mrow><mn>2</mn></mrow><mrow><mo>+</mo></mrow></msup></math> state, is smaller than the phenomenological result where standard effective charges are employed, suggesting the need for modifications of the latter in neutron-rich oxygen isotopes. We compare this result to both large-space and valence-space ab initio calculations, and by using multiple input interactions we explore the sensitivity of this observable to underlying details of nuclear forces."
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