Neutron Scattering - JUWEL - Forschungszentrum Jülich

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DNS 9 important and always necessary practical issue in order to obtain a precise separation. Therefore, the following exercise related to the flipping ratio correction is provided, 1. The measured flipping ratio from an ideal isotopic incoherent scatter Ni0.89Cr0.11 is 20, the spin-flip scattering intensity is I�� and the non-spin-flip scattering intensity is I��, how to calculated the corrected intensities for I�� and I�� by taking into account the finite flipping ratio? 4.3 Case studies In the final part, two case studies will be provided for students to maser neutron polarization analysis via the measurements on two real samples. The first one is the separation of nuclear coherent scattering from incoherent scattering in heavy water D2O [11]. The second case study is the measurement of magnetic ordering in the novel superconducting compound via the XYZ-method [9]. The following exercises are provided, 1. How to separate nuclear coherent scattering from spin-incoherent scattering in soft condensed matter? 2. How to obtain the magnetic scattering cross section via the XYZ-method? Which necessary corrections need to be done for a precise separation?
10 Y. Su References [1] W. Schweika, Polarized Neutron Scattering and Polarization Analysis, in Lecture Notes on Laboratory Course Neutron Scattering, Eds. Th. Brückel, G. Heger, D. Richter, G. Roth and R. Zorn (Forschungszentrum Jülich, 2010) [2] J. Schweiza, Polarized Neutron and Polarization Analysis, in Neutron Scattering from Magnetic Materials, Ed. T. Chatterji (Elsevier, Amsterdam, 2006) [3] P.J. Brown, Spherical Neutron Polarimetry, in Neutron Scattering from Magnetic Materials, Ed. T. Chatterji (Elsevier, Amsterdam, 2006) [4] L.P. Regnault, Inelastic Neutron Polarization Analysis, in Neutron Scattering from Magnetic Materials, Ed. T. Chatterji (Elsevier, Amsterdam, 2006) [5] R.M. Moon, T. Riste, W.C. Koehler, Phys. Rev. 181, 920 (1969) [6] O. Schärpf, H. Capellmann, Phys. Stat. Sol. (a) 135, 359 (1993) [7] J.R. Stewart et al., J. Appl. Cryst. 42, 69 (2009) [8] L.J. Chang et al., Phys. Rev. B 82, 172403 (2010) [9] M. Tegel et al., EPL 89, 37006 (2010) [10] Z.D. Fu et al., New Journal of Physics 12, 083044 (2010) [11] L. Temleitner et al., J. Phys.: Condens. Matter 19, 335207 (2007)
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Member of the Helmholtz Association
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Forschungszentrum Jülich GmbH Jül
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�� 1 PUMA
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2 POWDER DIFFRACTOMETER SPODI Conte
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2 M. Meven Contents 1 Introduction
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Page 63 and 64: 18 M. Meven To direct the secondary
Page 65 and 66: 20 M. Meven For a given spectrum
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Page 78 and 79: SPHERES Backscattering spectrometer
Page 80 and 81: SPHERES 3 1 Introduction Neutron ba
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Page 86 and 87: SPHERES 9 neutron is scattered, it
Page 88 and 89: SPHERES 11 The stationary equilibri
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Page 92 and 93: ________________________ DNS Neutro
Page 94 and 95: DNS 3 1 Introduction Polarized neut
Page 96 and 97: DNS 5 Monochromator horizontal- and
Page 98 and 99: DNS 7 3 Preparatory Exercises The p
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Page 130 and 131: KWS-3 3 1 Introduction Ultra small
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Page 136 and 137: KWS-3 9 References [1] Eskilden, M.
Page 138 and 139: ________________________ RESEDA Res
Page 140 and 141: RESEDA 3 1 Introduction Neutrons ar
Page 142 and 143: RESEDA 5 various length values l ac
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