What Do s- and p-Wave Neutron Average Radiative Widths Reveal

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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 ... continued below

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Mughabghab, S.F. April 30, 2010.

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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.

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  • Related Information: The 2010 International Conference on Nuclear Data for Science and Technology ; Jeju Island, Korea; 20100426 through 20100430

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  • Report No.: BNL--93861-2010
  • Grant Number: DE-AC02-98CH10886
  • DOI: 10.2172/1013497 | External Link
  • Office of Scientific & Technical Information Report Number: 1013497
  • Archival Resource Key: ark:/67531/metadc837384

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  • April 30, 2010

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  • May 19, 2016, 3:16 p.m.

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  • July 21, 2016, 7:07 p.m.

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Mughabghab, S.F. What Do s- and p-Wave Neutron Average Radiative Widths Reveal, report, April 30, 2010; United States. (digital.library.unt.edu/ark:/67531/metadc837384/: accessed September 25, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.