Unique features of structure in an odd-proton $N \approx Z$ nucleus $^{69}$As

Details Unique features of structure in an odd-proton $N \approx Z$ nucleus $^{69}$As Unique features of structure in an odd-proton $N \approx Z$ nucleus $^{69}$As

2005-11-07

arxiv.org/abs/nucl-th/0511018v1

Phys.Rev. C72 (2005) 064320

Physics

Nuclear Physics

Nuclear Theory

7 pages, 5 figures, accepted for publication in Pyhs. Rev. C

Scientific paper

10.1103/PhysRevC.72.064320

We apply a large-scale shell model to the study of proton-rich odd-mass nuclei with $N \approx Z$. Calculations predict unexpected structure in the $^{69}$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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