THE EFFECT OF ANGULAR MOMENTUM OF THE COMPOUND NUCLEUS ON THE RATIO OF THE ISOMERS Te$sup 119$ AND Te*SUP $sup 119$m PRODUCED IN LOW-ENERGY BOMBARDMENTS (thesis)
Technical Report
·
OSTI ID:4646221
The effect of angular momentum on compound nucleus reactions was investigated by measuring the formation cross-section ratios of a pair of isomers produced through compound nuclei--- xn reactions. Five different projectiles were used to produce the compound nucleus Te/sup 122*/, which yielded the isomers of Te/sup 119/ through a 3n reaction. The projectiles ranged in size from He/sup 3/ to O/sup 18/. The same isomers were also produced through 2n and Sn reactions by bombardment of the appropriate tin isotopes with He/sup 3/ and He/sup 4/. A method involving separation of the antimony daughter was devised for determining the isomer ratios. This method was completely independent of any decay scheme. The experimentally determined ratios (upperstate to lower-state isomer) varied from a low of about 0.75 to a high of about 25. The expected increase of ratio with energy and projectile size was verified. An apparent direct interaction of Li/sup 7/ projectiles was observed. Excitation functions were obtained for the reactions proceeding through the Te/sup 122*/ compound nucleus. The expected shift in peak position with projectile site was clearly demonstrated. Compound- nucleus calculations were performed by assuming a rounded nuclear potential approximated by a parabola (Bunthorne). Good agreement was obtained between experimentally determined isomer ratios and predictions based upon the calculated average angular momentum of the compound nucleus. 96 references. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab.; California. Univ., Berkeley
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-17-038094
- OSTI ID:
- 4646221
- Report Number(s):
- UCRL-10850
- Country of Publication:
- United States
- Language:
- English
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