ch42-p070 - It has N = 21 neutrons, so it has one neutron...

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70. (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. 42-1) with the magic nucleon numbers (special values of either Z or N ) listed in §42-8. We find that 18 O, 60 Ni, 92 Mo, 144 Sm, and 207 Pb each have a filled shell for either the protons or the neutrons (two of these, 18 O and 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).
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Unformatted text preview: It has N = 21 neutrons, so it has one neutron outside a closed shell for neutrons, and thus qualifies 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 filled 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 05/19/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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