科技报告详细信息
What Do s- and p-Wave Neutron Average Radiative Widths Reveal | |
Mughabghab, S.F. | |
关键词: CAPTURE; DIPOLES; FERMI GAS; MASS NUMBER; NEUTRON REACTIONS; NEUTRON SEPARATION ENERGY; NEUTRONS; P WAVES; RESONANCE; S WAVES; STRENGTH FUNCTIONS; | |
DOI : 10.2172/1013497 RP-ID : BNL--93861-2010 PID : OSTI ID: 1013497 Others : R&D Project: EST-003-NEFA Others : Other: KB0301041 Others : TRN: US1102669 |
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美国|英语 | |
来源: SciTech Connect | |
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【 摘 要 】
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.【 预 览 】
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