Nuclear Instruments and Methods in Physics Research A 467–468 (2001) 715–718 Nuclear resonant scattering beamline at SPring-8 Y. Yoda a, *, M. Yabashi a , K. Izumi b , X.W. Zhang c , S. Kishimoto c , S. Kitao d , M. Seto d , T. Mitsui e , T. Harami e , Y. Imai f , S. Kikuta a a Japan Synchrotron Radiation Research Institute (JASRI), SPring-8, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5198, Japan b Fundamental Research Laboratory, NEC, 34 Miyukigaoka, Tsukuba-shi, Ibaraki 305-0841, Japan c Photon Factory, High Energy Accelerator Research Organization, 1-1 Oho, Tsukuba-shi, Ibaraki 305-0801, Japan d Research Reactor Institute, Kyoto University, Kumatori, Sennan-gun, Osaka 590-0494, Japan e JAERI, SPring-8, 1-1-1 Kouto, Mikazuki-cho, Sayo-gun, Hyogo 679-5148, Japan f Department of Applied Physics, School of Engineering, University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan Abstract A nuclear resonant scattering beamline, BL09XU at SPring-8 has been constructed for the development of new experimental methods using nuclear resonant scattering and the study of materials science using nuclear coherent scattering and nuclear inelastic scattering. An in-vacuum linear undulator installed in the storage ring can produce intense X-rays up to 80 keV. More than 30 kinds of nuclear levels exist in this energy range. The general layout, the properties and the present status of the beamline are reported. # 2001 Elsevier Science B.V. All rights reserved. PACS: 07.85.Qe Keywords: Synchrotron radiation; SPring-8; Beamline; Nuclear resonant scattering; Nuclear forward scattering; Monochromator 1. Introduction Nuclear resonant scattering (NRS) using Syn- chrotron Radiation (SR) has remarkable features such as an ultra-narrow bandwidth, a small divergence, a small beam size and polarization. The effective X-ray flux for NRS increased remarkably by the utilization of the undulator source [1], which is eight years after the first observation using the bending magnet source [2]. The fields of applications using NRS have been spreading continuously [3]; in particular, nuclear inelastic scattering offers a unique technique for the vibrational states study [4]. Dedicated beam- lines for NRS were constructed at third generation large SR facilities [5,6]. The commissioning of the NRS beamline, BL09XU at SPring-8 began in July, 1997 and public use started in Octorber, 1997. 2. Beamline layout BL09XU is a standard X-ray beamline at SPring-8 [7,8] with a 32mm period in-vacuum linear undulator [9] and a rotated inclined Si double-crystal monochromator [10]. The beamline *Corresponding author. Tel.: +81-791-58-0802; fax: +81- 791-58-0830. E-mail address: yoda@spring8.or.jp (Y. Yoda). 0168-9002/01/$-see front matter # 2001 Elsevier Science B.V. All rights reserved. PII:S0168-9002(01)00474-0