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• W1619926894 abstract "We present the first ab initio structure investigation of the loosely bound $^{11}mathrm{Be}$ nucleus, together with a study of the lighter isotope $^{9}mathrm{Be}$. The nuclear structure of these isotopes is particularly interesting because of the appearance of a parity-inverted ground state in $^{11}mathrm{Be}$. Our study is performed in the framework of the ab initio no-core shell model. Results obtained using four different, high-precision two-nucleon interactions, in model spaces up to $9ensuremath{hbar}ensuremath{Omega}$, are shown. For both nuclei, and all potentials, we reach convergence in the level ordering of positive- and negative-parity spectra separately. Concerning their relative position, the positive-parity states are always too high in excitation energy, but a fast drop with respect to the negative-parity spectrum is observed when the model space is increased. This behavior is most dramatic for $^{11}mathrm{Be}$. In the largest model space we were able to reach, the $1/{2}^{+}$ level has dropped down to become either the first or the second excited state, depending on which interaction we use. We also observe a contrasting behavior in the convergence patterns for different two-nucleon potentials and argue that a three-nucleon interaction is needed to explain the parity inversion. Furthermore, large-basis calculations of $^{13}mathrm{C}$ and $^{11}mathrm{B}$ are performed. This allows us to study the systematics of the position of the first unnatural-parity state in the $N=7$ isotone and the $A=11$ isobar. The $^{11}mathrm{B}$ run in the $9ensuremath{hbar}ensuremath{Omega}$ model space involves a matrix with dimension exceeding $1.1ifmmodetimeselsetexttimesfi{}{10}^{9}$, and is our largest calculation so far. We present results on binding energies, excitation spectra, level configurations, radii, electromagnetic observables, and $^{10}mathrm{Be}+n$ overlap functions." @default.
• W1619926894 created "2016-06-24" @default.
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• W1619926894 date "2005-04-26" @default.
• W1619926894 modified "2023-09-25" @default.
• W1619926894 title "Large basis<i>ab initio</i>shell model investigation of<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mmultiscripts><mml:mi mathvariant=normal>Be</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mmultiscripts><mml:mi mathvariant=normal>Be</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>11</mml:mn></mml:mrow></…" @default.
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• W1619926894 doi "https://doi.org/10.1103/physrevc.71.044312" @default.
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