Interaction of 350-keV Polarized Neutrons with Oriented<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ho</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>165</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Nuclei

Wagner, R.; Miller, P. D.; Tamura, T.; Marshak, H.

doi:10.1103/physrev.139.b29

Cited by 55 publications

(15 citation statements)

References 39 publications

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“…2 and 3 were measured in a different nuclear orientation LB 2 /B 2 (max)« -0.25] with negligible uncertainty in the nuclear-orientation parameters. The apparent discrepancy between the present results and the results of Wagner et al 2 at 0.350 MeV is not understood. The application of the permissible 20% scale change to the present data, as discussed above, is not sufficient to resolve the discrepancy.…”

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confidence: 99%

Inversion in the Deformation Effect for Neutron Transmission Through OrientedHo165

et al. 1968

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I.Oi r H FIG. 3. Resistivity versus field at various temperatures for the same conditions as Fig. 1. Below #=0.5 xl0~5, the resistance is only weakly field dependent. evaluated at % -TH.Curves of the resistivity versus T for various H are given in Fig. 2. For sufficiently large H, there are two well-separated peaks; the first one occurs at temperatures above T K , whereas the second (lower temperature) peak is dependent in size and position primarily upon V.The experiments of Monod 11 on copper manganese agree qualitatively with these calculations insofar as they overlap in the temperature range. (The temperature was low enough, and the fields high enough to check the upper peak in Fig. 2.) On the other hand, Daybell and Steyert 12 working with Cr in Cu, observe no peaks, only a low-temperature plateau re-Measurements of the "deformation effect" in the total cross section for fast neutrons incident on oriented Ho 165 have been reported at neutron energies of 8, 15, 0.350, and 14 MeV. 1 " 3 The "deformation effect" is defined by Aa def = a(oriented)-a(unoriented), where o(oriented) and a(unoriented) are the total cross sections for the oriented and unoriented cases, gion.In Fig. 3, we show the resistance as function of H for fixed T.The drop in electrical resistance must be ascribed to four causes: the "freeze out" of the local moment exhibited in Eq. (5); the evaluation of the amplitudes at x = ±H, which for H> Tj£ is outside the resonance region; the change in r from its zero-field value; and the appearance of the new amplitude U. , to be published. respectively. The experiments have shown that Aa^e£ varies in magnitude with neutron energy, but in all measurements the sign of A0j e | has corresponded to the change in the geometrical cross section of the Ho 165 nucleus. A recent calculation, 1 using the coupled-channel formalism in the adiabatic approximation, predicted that Aa^e£ would undergo a sign change INVERSION IN THE DEFORMATION EFFECT FOR NEUTRON TRANSMISSION THROUGH ORIENTED Ho 165 tWe report measurements of the "deformation effect" in the total cross section for neutrons on oriented Ho 165 over the energy range 0.330-5.60 MeV. They are in good qualitative agreement with the prediction of a previous theoretical calculation, and the predicted inversion or sign change in the energy range 3-7 MeV is verified. 502

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Inversion in the Deformation Effect for Neutron Transmission Through OrientedHo165

et al. 1968

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“…It has been frequently used to study "deformation effects" in nuclei with x-ray [12], neutron [32,33], electron [34 -36], and pion [37] probes. At temperatures below 100 mK, the nuclear spin axes of the holmium nuclei are almost completely aligned in the basal planes of the crystal lattice [38), so that a single-crystalline sample can be aligned with the symmetry axis in a plane perpendicular to the beam direction without the use of an external magnetic Beld.…”

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confidence: 99%

Neutron deformation inHo165

et al. 1994

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We report asymmetries in the forward-angle difFerential cross sections for pion single-chargeexchange scattering from oriented and unoriented Ho nuclei. These asymmetries are directly related to the neutron deformation of a nucleus that has a large charge quadrupole moment. The measured asymmetry extrapolated to 0' is -0.020 6 0.024. In the model of Chiang and Johnson, this value implies a quadrupole deformation ratio P2/Pz = 0.84+0.08, indicating that the excess neutrons are less deformed than the protons. This result conSicts with the predictions of the best available Hartree-Fock models based on Skyrme interactions. We also report on asymmetries of the nonresonant continuum and of the giant dipole resonances.Elastic electron-scattering experiments provide the best systematic information on the nuclear shapes in that, to 6rst order, the momentum-transfer dependence of the cross sections is the Fourier transforxn of the charge distribution. Auxiliary information and constraints are also obtained kom inelastic-scattering experiments for which, within the &amework of vibrational or rotational models, the cross sections are proportional to the squares of the Pr, coefBcients. The quadrupole deformation moment Pz 0556-2813/94/50(2)/909

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“…A possible influence of deformation on the interaction can then only be deduced from a comparison of at least two different projectile-target systems with a definite change in projectile or target deformation. By performing experiments using this idea the influence of the spectroscopic deformation of holmium on the total neutron cross section [6,7] and on p-and ~-backscattering [8,9] was demonstrated. Another difficulty is that the contribution of the grazing partial waves to the interaction is most sensitive to the features of the interaction barrier.…”

Section: Introductionmentioning

confidence: 99%

The influence of the spectroscopic deformation of Li-isotopes on their interaction with51V

et al. 1982

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The energy dependence of the total reaction cross section ~r r and its tensor analyzing power T~o was measured for the 7Li-51V interaction in the energy range ELi=10-20MeV using two different experimental methods. Reaction residues were observed directly by their characteristic 7-emission, and the elastic scattering of 7Li from 51V was investigated. Additionally, the elastic scattering of 6Li from 51V was measured at 9.8, 12 and 14 MeV. The tensor analyzing power data can be interpreted as being caused by the spectroscopic mass deformation of the Li-ions. The energy dependence of crr and T~o above the Coulomb barrier can be described in terms of the classical sharp-cutoff model.Nuclear Reactions: 6'7Li+ 51V; ELi= 10-20 MeV, characteristic ?,-radiation of reaction residues, elastic scattering; measured reaction cross section crr and tensor analyzing power T~0; sharp-cutoff model.

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Interaction of 350-keV Polarized Neutrons with OrientedHo165Nuclei

Cited by 55 publications

References 39 publications

Inversion in the Deformation Effect for Neutron Transmission Through OrientedHo165

Inversion in the Deformation Effect for Neutron Transmission Through OrientedHo165

Neutron deformation inHo165

The influence of the spectroscopic deformation of Li-isotopes on their interaction with51V

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