1. COMPRES Fifth Annual Meeting Identify and broaden the EAR neutron scattering community in the U.S.Identify and broaden the EAR neutron scattering community in the U.S. Stimulate and promote the use of neutron scattering in the Earth Sciences.Stimulate and promote the use of neutron scattering in the Earth Sciences. Support educational activitiesSupport educational activities Identify needs of the community, including future requirements for instrumentation and sourcesIdentify needs of the community, including future requirements for instrumentation and sources COMPRES Neutron Initiative:

2. COMPRES Fourth Annual Meeting Financial assistance tFinancial assistance to carry out neutron scattering experiments and/or to participate in workshops and conferences on neutron scattering H. Sitepu: design and carry out high- P,T neutron experimentsH. Sitepu: design and carry out high- P,T neutron experiments Build user community by assisting members of community with experimentsBuild user community by assisting members of community with experiments Community informed about upcoming neutron workshops, conferences, deadlines for proposals, etc.Community informed about upcoming neutron workshops, conferences, deadlines for proposals, etc. Education materials available on www.vt.edu/compresEducation materials available on www.vt.edu/compres COMPRES Neutron Initiative: sitepu@vt.edu

3. COMPRES Fourth Annual Meeting “ High-pressure neutron diffraction study of AlOOD” (ISIS) - C. Vanpeteghem, H. Sitepu (VT) and E. Ohtani, S. Asami “Feasibility high pressure study of lithium aluminum deuteride [LiAlD4] and calcite [CaCO3]” using a PE cell on HIPD at LANSCE – H. Sitepu, A. Llobet Megias, and Y. Zhao “Investigation of Mg-Al site disorder in shocked MgAl2O4 spinel using neutron diffraction“ (ISIS) O. Tschauner (UNLV), H. Sitepu (VT), P. Asimow and T.J. Ahrens (Cal Tech). “Quantitative texture analysis of deformed natural quartz vein from the Torridon area of NW Scotland using neutron diffraction” (FRM-II) R.D. Law (VT), H. Sitepu (VT) and Prof. H.-G. Brokmeier (Tech. Univ. Clausthal). “Compressibility of layered molybdite (MoO3) powders determine from neutron diffraction studies at high pressure” (LLB) H. Sitepu (VT) and Dr. I. Goncharenko (LLB). Recent projects:

4. Neutron Initiative in Compres II? Travel support will continue – to be administered by COMPRES Central Form high-pressure neutron “task-force” made up members of the COMPRES community, experienced neutron researchers and representatives from neutron facilities (i) form high-pressure neutron network for exchange of information between high-pressure neutron facilities within the United States (LANSCE, IPNS, HIFR, SNS) and from around the world (ISIS, ILL, J-PARC) (ii) identify community needs and nurture infrastructure development projects and / or grand challenges as (iii) target, where appropriate, additional resources through which to leverage COMPRES funds

5. New projects such as... Temperature measurement using neutron reasonance spectroscopy (synergy with high P-T calibration effort) Software development for on-line / off-line evaluation and processing of data (synergy with CEAD) M. Dove, Y. Le Godec, S.A.T. Redfern, W.G. Marshall, H.J. Stone, M.G. Tucker,

6. High P-T cells for community? Paris-Edinburgh cell Modified P-E cell with belt design (Dobson, 2005) Panoramic cell or ??? 2 0 0 m m

7. MSA Short Course: NEUTRON SCATTERING IN EARTH SCIENCES December 7th and 8th, 2006 http://www.minsocam.org/msa/sc/ http://www.minsocam.org/msa/sc/

9. Temperature measurement by radiography Incoming neutron beam Sample in two sections Thin foil Transmitted neutron beam Detector Wavelength Transmitted intensity Neutron Absorption resonance

10. Effect of temperature Wavelength Transmitted intensity Width of resonance line can be used to calibrate temperature Width of resonance line increases with temperature due to Doppler effect

11. 181 Ta 10.36eV resonance Room temperature 181 Ta 10.36eV resonance 1400°C Doppler Broadening of Absorption Resonances: 181 Ta (early data)

12. Measured neutron resonance lineshape Pulse source function Detected signal: Area density of absorbing nuclei Detector efficiency Instrument resolution function Energy transfer function (the Doppler broadening function) Breit-Wigner lineshape Transmitted signal: Total cross-section:

13. Example resonance absorption specta

14. The resonance lineshape for a stationary nuclei is well described by the single-level Breit-Wigner equation Must account for the thermal motion of the nuclei in the lab frame (energy transfer function) –For a free gas or classical solid assume a Maxwellian distribution of velocities –For weak lattice binding can treat as a free gas replacing T by T eff Doppler Broadening of Absorption Resonances - Theory where For an Einstein solid: