NuDat 2.5 Alejandro Sonzogni National Nuclear Data Center

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Presentation transcript:

NuDat 2.5 Alejandro Sonzogni National Nuclear Data Center Brookhaven National Laboratory

What’s new since last NSDD meeting: NuDat has been updated regularly Migration to MySQL and new web servers in August 2009 More chart coloring schemes were added, 27 now, up from 23 in last meeting Coincidence matrix following decay – solved by software, not by format Improved accessibility, clean up jargon, expanded glossary ENSDF files – without comtrans – can be retrieved from NuDat We have worked to improved atomic radiation following nuclear decay.

When Atomic Radiation matters Example 125I Energy Balance (keV) Gammas 2.37 5 X-Rays 40.2 24 ß minus ß plus Conversion Electrons 6.98 9 Auger electrons 11.0 3 Neutrinos 123.98 5 Sum 184.6 24 Q-effective 185.77 6

EADL Evaluated Atomic Data Library, developed in LLNL by Chen et al. Assembled in ENDF-6 format by Red Cullen. Available from www.nndc.bnl.gov/sigma selecting Atomic Relaxation sub-library in ENDF/B-VII.0 library. For each Z value, it lists: Atomic sub-shells with corresponding binding energy. For each sub-shell, it gives transition energy and probability for X- rays and Auger electrons. For a given transition, it assumes that higher sub-shells are filled. So, corrections are needed if it is not the case. Must know vacancies generated by Electron Capture and Conversion. Assume that vacancies propagate outwards from the K-shell in an isolated atom with EADL corrected probabilities, and vacancies can only be filled by bound electrons (Deterministic & Isolated).

Comparison with Stepanek 2000 and Be 2006 for 125I Radiation Label Energya Intensitya Energyb Intensityb Intensityc Auger KLL 2.36E+04 1.22E-01 2.27E+04 1.25E-01 1.32E-01 Auger KLX 2.76E+04 5.41E-02 2.65E+04 5.59E-02 6.00E-02 Auger KXY 3.16E+04 5.40E-03 3.03E+04 5.99E-03 6.80E-03 CK LLX 3.13E+02 2.48E-01 3.02E+02 2.25E-01 2.72E-01 Auger LMM 3.21E+03 1.20E+00 3.09E+03 1.23E+00 Auger LMX 3.84E+03 3.56E-01 3.68E+03 3.46E-01 3.29E-01 Auger LXY 4.53E+03 2.55E-02 4.29E+03 2.49E-02 2.18E-02 CK MMX 1.18E+02 1.40E+00 1.21E+02 1.35E+00 Auger MXY 4.82E+02 3.20E+00 4.55E+02 3.17E+00 3.07E+00 K-L3 (Ka1) 2.86E+04 7.57E-01 2.75E+04 7.50E-01 7.40E-01 K-L2 (Ka2) 2.83E+04 4.10E-01 2.72E+04 4.01E-01 3.97E-01 K-M3 (Kb1) 3.23E+04 1.33E-01 3.10E+04 2.12E-01 K-N2+K-N3 (Kb2) 3.30E+04 4.25E-02 3.17E+04 4.24E-02 4.60E-02 K-M2 (Kb3) 3.22E+04 7.09E-02 3.09E+04 6.91E-02 K-N4+K-N5 (Kb4) 3.31E+04 3.00E-04 3.18E+04 2.46E-04 K-M4+K-M5 (Kb5) 3.25E+04 1.60E-03 3.12E+04 1.46E-03 a: Stepanek 2000, Table IV, Deterministic b:This work c: Be 2006 K intensities have 10% uncertainties. Higher values for less bound sub-shells

Conclusions on EADL We plan to upgrade the current Radlist available from NuDat using EADL for Z >=20. Highly detailed X-rays and Auger data for decay datasets. For Z < 20 we’ll keep the current scheme. In order to compare two different frameworks to calculate atomic radiation one needs to use the same set of vacancies for all sub-shells. We are saying good bye to old Siegbahn nomenclature, for instance, Ka2 will be replaced by K-L2

User’s feedback: More than 100 e-mails per year. Feedback drives new developments. Very interesting one, from folks in Northrop-Gruman, who use NuDat to understand proton activation when satellites pass through the Van Allen radiation belts. Interactive charts are the most popular product, followed by search/browse of decay data. Decay data usage is huge! Some of the most difficult questions have to do with the ENSDF forma, which will be discussed in my “ENSDF issues” talk. As a preview: Implicit uncertainties, for instance if BR = 1, we assume BR = 1 +- 0 Some old decay datasets should have at least a new Q-value, LOGFT and BRICC run FMTCHK doesn’t warn if S IB > 100

March Retrieval Statistics: Nudat retrievals up by ~50% in the following weeks Japan Earthquake Friday 3/11/2011