dorsal/arxiv
View SchemaStatistical Theory of Parity Nonconservation in Compound Nuclei
| Authors | S. Tomsovic, Mikkel B. Johnson, A. Hayes, J. D. Bowman |
|---|---|
| Categories | |
| ArXiv ID | nucl-th/9911057 |
| URL | https://arxiv.org/abs/nucl-th/9911057 |
| DOI | 10.1103/PhysRevC.62.054607 |
| Journal | Phys.Rev. C62 (2000) 054607 |
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 A\sim 230 and ^{104,105,106,108} Pd for A\sim 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.
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"abstract": "We present the first application of statistical spectroscopy to study the\nroot-mean-square value of the parity nonconserving (PNC) interaction matrix\nelement M determined experimentally by scattering longitudinally polarized\nneutrons from compound nuclei. Our effective PNC interaction consists of a\nstandard two-body meson-exchange piece and a doorway term to account for\nspin-flip excitations. Strength functions are calculated using realistic\nsingle-particle energies and a residual strong interaction adjusted to fit the\nexperimental density of states for the targets, ^{238} U for A\\sim 230 and\n^{104,105,106,108} Pd for A\\sim 100. Using the standard Desplanques, Donoghue,\nand Holstein estimates of the weak PNC meson-nucleon coupling constants, we\nfind that M is about a factor of 3 smaller than the experimental value for\n^{238} U and about a factor of 1.7 smaller for Pd. The significance of this\nresult for refining the empirical determination of the weak coupling constants\nis discussed.",
"arxiv_id": "nucl-th/9911057",
"authors": [
"S. Tomsovic",
"Mikkel B. Johnson",
"A. Hayes",
"J. D. Bowman"
],
"categories": [
"nucl-th"
],
"doi": "10.1103/PhysRevC.62.054607",
"journal_ref": "Phys.Rev. C62 (2000) 054607",
"title": "Statistical Theory of Parity Nonconservation in Compound Nuclei",
"url": "https://arxiv.org/abs/nucl-th/9911057"
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