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Author Ikegami, H.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ ANGULAR DISTRIBUTION ♦ ANTIMONY 117 ♦ BINDING ENERGY ♦ ELECTRIC MOMENTS ♦ ELECTRONS ♦ ENERGY ♦ ENERGY LEVELS ♦ GAMMA RADIATION ♦ INTERACTIONS ♦ MASS ♦ METALS ♦ MOMENTUM ♦ NUCLEAR MODELS ♦ NUCLEAR STRUCTURE ♦ NUMERICALS ♦ ORBITS ♦ PAIRING ENERGY ♦ PARTICLE MODELS ♦ PROBABILITY THEORY ♦ QUANTUM MECHANICS ♦ QUASI PARTICLES ♦ SHELL MODELS ♦ STATISTICS ♦ TRANSIENTS
Abstract Several examples of the effect of pairing correlations on nuclear gamma- ray transitions are presented. It is shown that even it collective coupling exists, gamma-ray transitions of electric multipole type between low-lying quasiparticle states whose free shell-model orbit energies are symmetrically related to the Fermi energy may be extremely retirded. The factor (U/sub i/U/sub f/-V/sub i/V/sub f/) that arises fro m the pairing correlation is directly estimated from empirical even-odd mass difference data. The agreement of the calculated transition probabilities with experimental results is good. A shell- model calculation taking into account the pairing correlation was also made for transitions of E2 type between d/sub 3/2/ and s/sub 1/2/ orbits in Sn/sup 117/ and Sn/sup 11 8/ and the results are compared with that of the quasiparticle approximation. It is shown that the quasiparticle approximation is more improved by using renormalized wave functions that are obtained by projecting out only the terms having the correct number of particles than by taking into account only the blocking effect except for special cases. (auth)
ISSN 0031899X
Educational Use Research
Learning Resource Type Article
Publisher Date 1964-03-23
Publisher Department Brookhaven National Lab., Upton, N.Y.
Publisher Place United States
Journal Physical Review
Volume Number 133
Technical Publication No. BNL-7446
Organization Brookhaven National Lab., Upton, N.Y.


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