Statistical theory of parity nonconservation in compound nuclei

Journal Article · Wed Nov 01 04:00:00 EST 2000 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.62.054607· OSTI ID:40206085

Tomsovic, S; Johnson, Mikkel B; Hayes, A C; Bowman, J D

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 0{sup -} 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, {sup 238}U for A{approx}230 and {sup 104,105,106,108}Pd for A{approx}100. Using the standard Desplanques-Donoghue-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 {sup 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.

• Sponsoring Organization: (US)
• OSTI ID: 40206085
• Journal Information: Physical Review C, Journal Name: Physical Review C Journal Issue: 5 Vol. 62; ISSN 0556-2813
• Publisher: The American Physical Society
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSON-EXCHANGE MODELS
COMPOUND NUCLEI
COUPLING CONSTANTS
MATRIX ELEMENTS
P INVARIANCE
PARITY
SPIN FLIP
STRENGTH FUNCTIONS
STRONG INTERACTIONS