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Measurement of neutron cross sections and resonance parameters of ^(169)Tm below 100 eV

Chinese Physics C 2010年第2期34卷 177-181页

作者：王文明李霞赵志祥周祖英于洪伟吴海成魏义祥 T.F. Wang G.N. Kim M.W. Lee K.S. Kim M.H. Cho I.S. Ko W. Namkung China Institute of Atomic Energy Department of Engineering Physics Tsinghua University Department of Physics Kyungpook National University Department of Physics Pohang University of Science and Technology

The neutron total cross-sections of thulium （^169Tm） were measured in the neutron energy region from 0.01 eV to 100 eV by using the time-of-flight method at the Pohang Neutron Facility, which consists of an electron linac, a water-cooled tantalum target with a water moderator, and a 12 m time of flight path, Two thulium plates with different thicknesses were used for the neutron transmission measurement. The background level was determined by using a notch-filter of Co, In, and Cd sheets. The present measurement was compared with the previous ones, and a new set of resonance parameters of ^169Tm isotope was obtained from the transmission rate by using the SAMMY code, with a comparison with the recommended parameters by Mughabghab.

关键词： resonance parameters thulium n-TOF method SAMMY

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Determination of the Earth’s free core nutation parameters by using tidal gravity data

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Acta Seismologica Sinica(English Edition) 2007年第6期20卷 708-711页

作者：刘明波孙和平徐建桥周江存 Institute of Geodesy and Geophysics Chinese Academy of Sciences

The Earth＇s free core nutation （FCN） is a retrograde eigenrnode which is attributed to the interaction between the solid mantle and the liquid core of the rotational elliptical Earth. This mode appears as an eigenmode of nearly diurnal free wobble （NDFW） in a terrestrial reference frame with a period of about one day （XU et al, 2001）. Therefore, the NDFW will lead to an obvious resonance enhancement in the diurnal tidal gravity observations, especially those of the tidal waves with frequencies closed to its eigenfrequency such as P1, K1, ψ1 and Ф1. The FCN resonance parameters can be retrieved accurately by high-precision tidal gravity observations, especially those recorded with the superconducting gravimeters （SG）. The Global Geodynamics Project （GGP） organized by IUGG took it as an important content for determining the FCN resonance parameters by using gravity data. However, the results are affected by many factors such as station location, background noise, the selection of the tide-generating potential tables, ocean tide models, data processing techniques and so on. In our study, the FCN parameters will be retrieved by using the SG observations at Wuhan, and the effects of the choices of various tide-generating potential tables, oceanic models and weight functions on the estimation of the FCN parameters will be discussed in detail,

关键词： superconducting gravimeter free core nutation resonance parameters

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