What Do s- and p-Wave Neutron Average Radiative Widths Reveal
A first observation of two resonance-like structures at mass numbers 92 and 112 in the average capture widths of the p-wave neutron resonances relative to the s-wave component is interpreted in terms of a spin-orbit splitting of the 3p single-particle state into P{sub 3/2} and P{sub 1/2} components at the neutron separation energy. A third structure at about A = 124, which is not correlated with the 3p-wave neutron strength function, is possibly due to the Pygmy Dipole Resonance. Five significant results emerge from this investigation: (i) The strength of the spin-orbit potential of the optical-model is determined as 5.7 {+-} 0.5 MeV, (ii) Non-statistical effects dominate the p-wave neutron-capture in the mass region A = 85 - 130, (iii) The background magnitude of the p-wave average capture-width relative to that of the s-wave is determined as 0.50 {+-} 0.05, which is accounted for quantitatively in tenns of the generalized Fermi liquid model of Mughabghab and Dunford, (iv) The p-wave resonances arc partially decoupled from the giant-dipole resonance (GDR), and (v) Gamma-ray transitions, enhanced over the predictions of the GDR, are observed in the {sup 90}Zr - {sup 98}Mo and Sn-Ba regions.
- Research Organization:
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Sponsoring Organization:
- DOE - Nuclear Energy,Science, & Technology
- DOE Contract Number:
- DE-AC02-98CH10886
- OSTI ID:
- 1013497
- Report Number(s):
- BNL-93861-2010; R&D Project: EST-003-NEFA; KB0301041; TRN: US1102669
- Resource Relation:
- Related Information: The 2010 International Conference on Nuclear Data for Science and Technology ; Jeju Island, Korea; 20100426 through 20100430
- Country of Publication:
- United States
- Language:
- English
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