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<p>of protons and neutrons in an <a href="page.php?w=atomic_nucleus">atomic nucleus</a> are <a href="page.php?w=spherical">spherical</a>, prolate, and oblate spheroidal, where the polar axis is assumed to be the spin axis (or direction of the spin <a href="page.php?w=angular_momentum">angular momentum</a> vector). Deformed nuclear shapes occur as a result of the competition between <a href="page.php?w=Electromagnetic_force">electromagnetic</a> repulsion between protons, <a href="page.php?w=surface_tension">surface tension</a> and <a href="page.php?w=Quantum_mechanics">quantum</a></p><p>
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