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Statistical Theory of Parity Nonconservation in Compound Nuclei | | S. Tomsovic
; Mikkel B. Johnson
; A. Hayes
; J. D. Bowman
; | | Date: |
17 Nov 1999 | | Journal: | Phys.Rev. C62 (2000) 054607 | | Subject: | nucl-th | | Affiliation: | Washington State University), Mikkel B. Johnson (LANL), A. Hayes (LANL), J. D. Bowman (LANL | | Abstract: | We present the first application of statistical spectroscopy to study the root-mean-square value of the parity nonconserving (PNC) interaction matrix element M determined experimentally by scattering longitudinally polarized neutrons from compound nuclei. Our effective PNC interaction consists of a standard two-body meson-exchange piece and a doorway term to account for spin-flip excitations. Strength functions are calculated using realistic single-particle energies and a residual strong interaction adjusted to fit the experimental density of states for the targets, ^{238} U for Asim 230 and ^{104,105,106,108} Pd for Asim 100. Using the standard Desplanques, Donoghue, and Holstein estimates of the weak PNC meson-nucleon coupling constants, we find that M is about a factor of 3 smaller than the experimental value for ^{238} U and about a factor of 1.7 smaller for Pd. The significance of this result for refining the empirical determination of the weak coupling constants is discussed. | | Source: | arXiv, nucl-th/9911057 | | Services: | Forum | Review | PDF | Favorites | |
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