p43_074 - N = 21 neutrons so it has one neutron outside a...

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74. (a) We compare both the proton numbers (atomic numbers, which can be found in Appendix F and/or G) and the neutron numbers (see Eq. 43-1) with the magic nucleon numbers (special values of either Z or N ) listed in § 43-8. We ±nd that 18 O, 60 Ni, 92 Mo, 144 Sm, and 207 Pb each have a ±lled shell for either the protons or the neutrons (two of these, 18 Oand 92 Mo, are explicitly discussed in that section). (b) Consider 40 K, which has Z = 19 protons (which is one less than the magic number 20). It has
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Unformatted text preview: N = 21 neutrons, so it has one neutron outside a closed shell for neutrons, and thus quali±es for this list. Others in this list include 91 Zr, 121 Sb, and 143 Nd. (c) Consider 13 C, which has Z = 6 and N = 13 − 6 = 7 neutrons. Since 8 is a magic number, then 13 C has a vacancy in an otherwise ±lled shell for neutrons. Similar arguments lead to inclusion of 40 K, 49 Ti, 205 Tl, and 207 Pb in this list....
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.

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