Estimate the radius of the ⁴⁰Ca nucleus from the data in Figure 6.6 and compare to that expected from the empirical value ≈ 1.4A^1/3 fm, where A is the nuclear mass number. Check the validity of using the first-order Born approximation for these data.

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dolde (mb/sr) 104 10³ 10² 10¹ 10⁰ 10-1 10-2 10-3 لم السسسلاسل 10-4 2 * 1 1 4 6 . Proton elastic scattering 800 MeV Ca x 0.1 42Ca × 0.01 40Ca x 0.001 8 . ا * ا . ا 10 12 14 0c.m. (deg) ا 16 18 20 22 24