Creation of polarized ultracold neutrons and observation of Ramsey resonance for electric dipole moment measurement期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Creation of polarized ultracold neutrons and observation of Ramsey resonance for electric dipole moment measurement

Authors:	K Matsuta Y Masuda K Hatanaka S C Jeong S Kawasaki R Matsumiya M Mihara Y Watanabe D Nishimura Y Morita K Asahi T Adachi J Martin A Konaka A Miller C Bidinosti T Dawson L Lee C Davis D Ramsay W van Oers E Korkmaz L Buchman

Institution:	1. National University of Science and Technology “MISIS”, 119049, Moscow, Russia 2. Vienna University of Technology, 1040, Wien, Austria 3. Ltd. Research and Production Complex “Magnets and Magnetic Systems”, 127238, Moscow, Russia

Abstract:	Polarized UCNs have been created by selecting only one spin state passing through a magnetized Fe foil. Typical degree of polarization was about 90 %. The polarization relaxation time in the prototype Ramsey cell was $T_1 =1100^{+800}_{-400}(Nd,Pr)-(Tb,Dy,Gd)-(Fe,Co,Al,Cu)-B magnets were heat treated in two different ways and investigated in the temperature range 4.2 to 400 K. After optimal heat treatment intrinsic coercive field _i H _c?= 1640 and 5040 kA/m for room temperature and 10 K was obtained and the temperature coefficient of remanence α?=??0.01 for temperature range 80 to 375 K was found. On basis of magnetic measurements and ⁵⁷Fe Mössbauer spectroscopy, the possible reasons for the increase of _i H _c during multi-step heat treatment are discussed.

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