Program - Brookhaven National Laboratory

The knowledge of neutron-induced reaction cross sections and their uncertainties is an important prerequisite
for the optimized choice of structural materials used in nuclear facilities. In this contribution
neutron-induced reactions on Ta-181, an important component of several structural materials, are considered.
Especially, a consistent set of angle-integrated neutron-induced reaction data of Ta-181 and associated
covariance matrices in the energy range from 1 to 150 MeV are presented which have been obtained by
the Full Bayesian Evaluation Technique [1] implemented in GENEUS. This method is based on Bayesian
statistics and relies on a well-determined prior covariance matrix. In particular the presented evaluation
makes use of the recently established prior structural materials library [2]. The measurement details of
available experimental data have been studied in order to establish proper experimental covariance matrices,
which are required for the Bayesian procedure. The results of the Full Bayesian Evaluation Technique
are compared to available evaluated data files of Ta-181 and the differences are discussed. In addition, the
possibility to include angle-differential data is addressed. Work supported by F4E within the FPA-168.
Corresponding author: H. Leeb
[1] H. Leeb, D. Neudecker, Th. Srdinko, Nucl. Data Sheets 109 (2008) 2762. [2] D. Neudecker, St.
Gundacker, H. Leeb, Th. Srdinko, V. Wildpaner, EPJ Web of Conferences, 27 (2012) 00010.
PR 24
Nuclear Decay Data Evaluations at IFIN-HH, Romania
Aurelian Luca, Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), 30
Reactorului St., PO Box MG-6, Magurele, Ilfov county, RO-077125, Romania.
An important IAEA Coordinated Research Project (CRP), F42006 ”Updated decay data library for Actinides”
was implemented during the period 2005-2012. The author participated in the CRP, as a representative
of the Horia Hulubei National Institute of Physics and Nuclear Engineering (IFIN-HH), the
Radionuclide Metrology Laboratory. Decay data for five Actinides nuclei were evaluated by the author,
according to the procedures and rules of the international cooperation Decay Data Evaluation Project
(DDEP): 236 U, 234 Th, 228 Ra, 211 Bi and 211 Po. The most important results obtained, conclusions and some
recommendations of the evaluator are presented. The IFIN-HH involvement in several new international
and national research projects in the field is briefly mentioned; new evaluations and experimental determination
of some nuclear decay data (photon absolute intensity, half-life) for nuclear medicine applications
are foreseen. This work was supported by the IAEA, under the Research Contract RBF no. 13341/2005.
[1] M.A. Kellett, M.-M. Be, V. Chechev, X. Huang, F.G. Kondev, A. Luca, G. Mukherjee, A.L. Nichols,
A. Pearce, Journal of the Korean Physical Society 59 (23), 1455 (2011) [2] A. Luca, Appl.Radiat.Isot. 68,
1591 (2010)
PR 25
Actinide, Activation Product and Fission Product Decay Data for Reactor-Based
Applications
C.J. Dean*, R.J. Perry and A.L. Nichols**, AMEC plc, Kimmeridge House, Dorset Green Technology
Park, Winfrith Newburgh, Dorchester, Dorset, DT2 8ZB, UK.
The UK Activation Product Decay Data Library was first released in September 1977 as UKPADD1, and
the UK Heavy Element and Actinide Decay Data Library followed in December 1981 as UKHEDD1. Modest
improvements have been made to UKHEDD leading up to 2007, while UKPADD has continued to be
developed on an almost yearly basis. The contents of the most recent versions of UKHEDD (UKHEDD2.6,
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