16. The spin, I of ground state for even-even nucleus is zero. But for odd nuclei, I 0. for example has ground state spin (lo =7/2) and the spins for the first excited states are (9/2) and (11/2). Evaluate the ratio E(11/2)/E(9/2). Hint: use E(I)rot where 1- (lo+), (lo+2). (lo+3), etc, and I is the moment of inertia of the nucleus about an axis through the center perpendicular to the axis of symmetry. 2.22 A) 0.84 (10+1) %3D (lo+1)) B) 2.81 C) 2.22 D) 3.42 E) 1.24
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