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• W2014700517 endingPage "249" @default.
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• W2014700517 abstract "Cross sections, analyzing powers and spin-flip probabilities have been measured for inclusive inelastic scattering of 290 MeV protons from $^{54}mathrm{Fe}$ at laboratory angles between 3.1ifmmode^circelsetextdegreefi{} and 20ifmmode^circelsetextdegreefi{}. The momentum transfers vary from small values (qensuremath{sim}0.2 ${mathrm{fm}}^{mathrm{ensuremath{-}}1}$) where individual giant resonances of low multipolarity are observed, to larger values (qensuremath{sim}1.4 ${mathrm{fm}}^{mathrm{ensuremath{-}}1}$) where quasielastic scattering dominates. Complete measurements of spin observables at 20ifmmode^circelsetextdegreefi{} are discussed, which show that present impulse approximation models based on either the Dirac or the Schrodinger equation for the nucleon are not capable of reproducing all the data. At all momentum and energy transfers the measured analyzing powers ${mathit{A}}_{mathit{y}}$ are smaller than predictions from nonrelativistic calculations. Relativistic calculations explain this reduction of ${mathit{A}}_{mathit{y}}$ for data near the quasielastic point (ensuremath{omega}=${mathit{q}}^{2}$/2m) as an effect of the attractive scalar field in the nuclear medium; however, they fail to reproduce the observed slopes [d(${mathit{A}}_{mathit{y}}$)/densuremath{omega} at fixed angle], assuming for the nuclear response a simple Fermi gas model.For the observed range of momentum and energy transfers (ensuremath{omega}ensuremath{le}96 MeV at 20ifmmode^circelsetextdegreefi{}; ensuremath{le}45 MeV at smaller angles) the spin-flip probabilities ${mathit{S}}_{mathit{n}mathit{n}}$ and spin-flip strengths ensuremath{sigma}${mathit{S}}_{mathit{n}mathit{n}}$ appear to be rather insensitive to assumptions about the reaction mechanism and are qualitatively described by a nonrelativistic model of quasielastic scattering, which approximates the nuclear response by that of a semi-infinite slab with random phase approximation (RPA) correlations. Strongly enhanced ${mathit{S}}_{mathit{n}mathit{n}}$ values are observed for ensuremath{omega}>25 MeV and qensuremath{simeq}100 MeV/c in agreement with similar observations for several other nuclei. The slab model gives a reasonable account of cross sections and angular distributions for the $^{54}mathrm{Fe}$(n,p${)}^{54}$Mn reaction at 298 MeV. The inclusion of damping of the response by two-particle--two-hole excitations and of contributions from two-step processes improves the agreement with the (n,p) data. Using the experimental cross sections for (p,p') and (n,p) reactions and the measured spin-flip strengths in (p,p'), we have separated the nuclear response into spin (ensuremath{Delta}S=0, ensuremath{Delta}S=1), isopin (${mathit{T}}_{mathit{f}}$=1,2) and angular momentum (L=0,1,2, . . .) components. The distribution and strengths of the Gamow-Teller, the isovector giant dipole, and the (isoscalar) giant quadrupole resonances have been determined from this analysis and are compared to results from complementary reactions. Relative to quasiparticle RPA calculations the Gamow-Teller quenching factors deduced from the ensuremath{sigma}${mathit{S}}_{mathit{n}mathit{n}}$ data are slightly smaller than those from (p,n) and (n,p) reactions." @default.
• W2014700517 created "2016-06-24" @default.
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• W2014700517 date "1991-01-01" @default.
• W2014700517 modified "2023-10-18" @default.
• W2014700517 title "Nuclear response in the<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>Fe</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>54</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>(<i>p</i>→,<i>p</i>→’) reaction at 290 MeV" @default.
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• W2014700517 doi "https://doi.org/10.1103/physrevc.43.230" @default.
• W2014700517 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/9967064" @default.
• W2014700517 hasPublicationYear "1991" @default.
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