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<p>Polarization-analyzed small-angle neutron scattering (PASANS) is an advanced technique that enables selective investigation of magnetic scattering phenomena in magnetic materials and distinguishes coherent scattering obscured by an incoherent background, making it particularly valuable for cutting-edge research. The successful implementation of PASANS in China was achieved for the first time at the newly commissioned very small-angle neutron scattering (VSANS) instrument at the China Spallation Neutron Source (CSNS). This technique employs a combination of a double-V cavity supermirror polarizer and a radio frequency (RF) neutron spin flipper to manipulate the polarization of the incident neutrons. The polarization of scattered neutrons was stably analyzed using a specially designed <i>in&#xa0;situ</i> optical pumping <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(^{3}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>3</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>He neutron spin filter, which covers a spatially symmetric scattering angle range of about 4.8<InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(^{\circ }\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mo>∘</mo> </mmultiscripts> </math></EquationSource> </InlineEquation>. A comprehensive PASANS data reduction method, applicable to pulsed neutron beams, has been established and validated with a silver behenate powder sample, achieving a maximum momentum transfer range of approximately 0.25 Å<InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(^{-1}\)</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mrow> <mo>-</mo> <mn>1</mn> </mrow> </mmultiscripts> </math></EquationSource> </InlineEquation>.</p>

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Polarization-analyzed small-angle neutron scattering with an in situ 3He neutron spin filter at the China Spallation Neutron Source

  • 期刊论文

  • 发表日期：

    2026年6月18日

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  • Long Tian,
  • Han Gao,
  • Tian-Hao Wang,
  • Hai-Yun Teng,
  • Jian Tang,
  • Qing-Bo Zheng,
  • Tai-Sen Zuo,
  • Teng-Fei Cui,
  • Bin Wang,
  • Qin Xu,
  • Yong-Xiang Qiu,
  • Yu-Chen Dong,
  • Yu-Jie Zheng,
  • Ze-Cong Qin,
  • Ze-Hua Han,
  • Jun-Pei Zhang,
  • He Cheng,
  • Xin Tong

摘要

Polarization-analyzed small-angle neutron scattering (PASANS) is an advanced technique that enables selective investigation of magnetic scattering phenomena in magnetic materials and distinguishes coherent scattering obscured by an incoherent background, making it particularly valuable for cutting-edge research. The successful implementation of PASANS in China was achieved for the first time at the newly commissioned very small-angle neutron scattering (VSANS) instrument at the China Spallation Neutron Source (CSNS). This technique employs a combination of a double-V cavity supermirror polarizer and a radio frequency (RF) neutron spin flipper to manipulate the polarization of the incident neutrons. The polarization of scattered neutrons was stably analyzed using a specially designed in situ optical pumping \(^{3}\) 3 He neutron spin filter, which covers a spatially symmetric scattering angle range of about 4.8 \(^{\circ }\) ∘ . A comprehensive PASANS data reduction method, applicable to pulsed neutron beams, has been established and validated with a silver behenate powder sample, achieving a maximum momentum transfer range of approximately 0.25 Å \(^{-1}\) - 1 .