Unique features of structure in an odd-proton<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>N</mml:mi><mml:mo>≈</mml:mo><mml:mi>Z</mml:mi></mml:mrow></mml:math>nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">As</mml:mi><mml:mprescripts/><mml:none/><mml:mrow><mml:mn>69</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>
TL;DRAbstract
We apply a large-scale shell model to the study of proton-rich odd-mass nuclei with $N\ensuremath{\approx}Z$. Calculations predict unexpected structure in the $^{69}\mathrm{As}$ nucleus for which a detailed experiment was recently performed. In this odd-proton nucleus, one neutron competes with one proton for occupying the high-j intruder orbit ${g}_{9/2}$ in the $9/{2}_{1}^{+}$ state and almost solely occupies the ${g}_{9/2}$ orbit in other low-lying positive-parity states. The $T=0,J=9$ one-proton-one-neutron alignment takes place in the negative-parity states with medium-high spins. A unique coexistence of two lowest bands with positive and negative signs of spectroscopic quadrupole moments is predicted.
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We apply a large-scale shell model to the study of proton-rich odd-mass nuclei with $N\ensuremath{\approx}Z$. Calculations predict unexpected structure in the $^{69}\mathrm{As}$ nucleus for which a detailed experiment was recently performed. In this odd-proton nucleus, one neutron competes with one proton for occupying the high-j intruder orbit ${g}_{9/2}$ in the $9/{2}_{1}^{+}$ state and almost solely occupies the ${g}_{9/2}$ orbit in other low-lying positive-parity states. The $T=0,J=9$ one-proton-one-neutron alignment takes place in the negative-parity states with medium-high spins. A unique coexistence of two lowest bands with positive and negative signs of spectroscopic quadrupole moments is predicted.
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