LectureNotes30(1)

LectureNotes30(1) - CHEM [email protected] TM Mai/aye Diwali/i7 W37...

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Unformatted text preview: CHEM New @370 TM Mai/aye Diwali/i7 W37 lief mdecm 65 [A 6'9 :29. 9 343 55Fe 8“Kr i198” "T700 (U 607 5 Maj/€04 LAN 160 MM 205 ¢ thc Tl 235 M (“N W 8 12C \Region of very N ”N slable nuclides m cm 1 Fusion Fission Binding energy per nucieon (MeV) 20 40 BO 80 100 120 140 160 180 200 220 240 260 , Mass number (A) 1:: iii 9. all _. The variation in binding energy per nucleon. A plot of the binding energy per nucleon vs. mass number shows rbat nuclear stability is greatest in the region near 55Fe. Lighter nuclei may undergo fusion to become more stable; heavier ones may undergo fission. Notelhe ex— ceptional stability of “He among extremely light nuclei. iii-fin“ Mil/Lorie W) 140 130 120 110- 100 90 \; so _ 3- 2 . s a a) I 2 so 50 40 80 _ Posntron emission end/or electron capture 20 10 D 10 2O 30 40 5t} 60 70 BO Prolons (2} 90 Neutrons (N) 03 (n i eoooooo @@ so. goo e e oooeoe cocoa :59 see on , o, 44. .LV r,.. l m (n on a: c: :9 9. o 3 U) m m .4 o j A plot of number of neutrons vs. number of protons for the stabte nuclides. A, A plot of N vs. 2 for all stable noclldes gives rise to a narrow band that veers above N/Z = 1 shortly beyond Z = 10. The N/Z values for several stable nuclides are given. The most common modes of decay for unstable nuclides in a partiouiar region are shown: nuclides with a high N/Z ratio often undergo [3 decay; those with a low ratio undergo e" capture or positron emis- sion; heavy nuclei beyond the stable band (and a few lighter ones) undergo cl decay. B, The blue box in part A is expanded to show the stable and many of the unstable nuclides in that area. Note the modes of decay: o: decay decreases both N and Z by 2; B decay de— creases N and increases Z by l; positron emission and e‘ capture increase N and decrease Z by 1. TM 24.4 ,4“ MM ,W mix/um meg/g é; Ermim 9F YW Nudt'oéf Mm @E/W an‘l'k W? Z— N mom/z, EMA 5% 69 (9qu Me My ______________‘M @Ma 7 W Tm Ma ' Numhflrj.‘ Nadia!“ (ml/4a NWZWO/ gm TIA-94A Wt. (Mani/p91! EM? . EX/fljgéf @Tfiwwemze EM 959mm W (4 (9C @ Ir: Wuwaframxj (Q)U-J4r3»v (6} WM!) (a) MW [l—osi‘i’YM Mssl'm 69 mm 24 WW! Wr— s {modem ”£321 : ...
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