Program - Brookhaven National Laboratory

many of the observed levels of 30 P. This contribution presents results of γ-ray study of the 28 Si( 3 He,pγ) 30 P
reaction using high-resolution HPGe detectors for this reaction for the first time.
Corresponding author: Balraj Singh
[1] E. Bravo and G. Martinez-Pinedo, Phys. Rev. C 85,055805(2012)
HD 8 5:45 PM
Experimental Measurement of Absolute Gamma-ray Emission Probabilities for 138 Xe
Xie Feng, Jiang Wen-gang, Li Xue-song, He Xiao-bing,
Northwest Institute of Nuclear Technology
The gamma-ray emission probability is an important factor in the research field of nuclear-reaction products
or radioisotope application. 138 Xe decays by beta-particle emission with a half-life of 14.08 min[1]. 138 Cs is
daughter of 138 Xe, and decays by beta-particle emission with a half-life of 33.41 min[1] . The 138 Xe, with
a short half-life, is radioactive gas nuclide. It was therefore difficult to determine the precise gamma-ray
emission probability by using the routine method. Reference [1] an [2] gave the results of gamma-ray
emission probabilities for 138 Xe, but the uncertainties is relatively large. Recently through preparation
of the homogeneous sources for 138 Xe- 138 Cs [3], we obtained the activity of 138 Xe by using the decay
relationship between 138 Xe and 138 Cs. After the gamma-ray efficiency curve of the HPGe detector was
calibrated using many standard sources and self-absorbed effect was corrected [4], the absolute gamma-ray
full-energy peak efficiency of 138 Xe were determined. Thus, the absolute emission probabilities of three
main gamma-ray for 138 Xe were determined , and the results of 258 ,434keV and 1768keV were 34.91(62)%,
22.18(35)% and 18.79(30)%, respectively. The results of the present work were in poor agreement with
Ref.[1]. Because the data adopted in the evaluation of Ref[1] were almost determined in the 1970’s when
the experiment equipment and measuring technology were behind today, we believe that the results gave
in the present work are more reliable.
[1] FIRESTONE R B., Table of isotopes, 8th Edition, 1998. [2] J.K.Tuli, Selected Update for A=138*,
Nuclear Data Sheets, 74,349, 1995. [3] Z.Y.Chen, F.Xie, Preparation of calibration sources of 88 Kr and
138 Xe for HPGe detector, Journal of Radioanalytical and Nuclear Chemistry, 273: 257-261, 2007. [4] XIE
Feng, The study of self-absorption correction in γ-ray efficiency calibration of fission gas nuclide, Atom
Energy Science and Technology, Vol.44, No.10, 2010.
Session HE Nuclear Power Applications
Tuesday March 5, 2013
Room: Central Park West at 3:30 PM
HE 1 3:30 PM
Improvement of 238 U Inelastic Scattering Cross-Section for an Accurate Calculation of
Large Commercial Reactors
Alain Santamarina, D. Bernard, P. Leconte, J-F. Vidal
CEA
Sensitivity/Uncertainty studies are more and more used in Reactor Physics [1] and Safety-Criticality [2]
[3]. There are currently utilized to assess the calculation uncertainty of design parameters for GEN-3
and GEN-4. However, these S/U studies require realistic variance/covariance matrices associated with
the Nuclear Data evaluation implemented in the ND working library. Therefore, it is recommended to
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