Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Nuclear Astrophysics Resources of Nuclear Astrophysics Resources of the National Nuclear Data Centerthe National Nuclear Data Center

B. Pritychenko*, M.W. Herman, S.F. Mughabghab, B. Pritychenko*, M.W. Herman, S.F. Mughabghab, P. Oblozinsky, A.A. SonzogniP. Oblozinsky, A.A. Sonzogni

National Nuclear Data Center, Brookhaven National Laboratory, Upton, U.S.A.National Nuclear Data Center, Brookhaven National Laboratory, Upton, U.S.A.*pritychenko@bnl.gov*pritychenko@bnl.gov

  

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

NNDC Web ServicesNNDC Web Services

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

NNDC Computer NetworkNNDC Computer Network

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Nuclear Astrophysics MotivationNuclear Astrophysics Motivation

• NNDC is a leading provider of Nuclear Data Web services

• NNDC produces nuclear data, publications and codes

• Why not to apply NNDC nuclear data resources for nuclear astrophysics ?

• Example of 151

Sm(n,) reaction

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Nuclear Science ReferencesNuclear Science Referenceswww.nndc.bnl.gov/nsrwww.nndc.bnl.gov/nsr

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Q-value CalculatorQ-value Calculatorwww.nndc.bnl.gov/qcalcwww.nndc.bnl.gov/qcalc

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Chart of NuclidesChart of Nuclideswww.nndc.bnl.hov/chartwww.nndc.bnl.hov/chart

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Experimental Nuclear Reaction DataExperimental Nuclear Reaction Data

CSISRS, alias EXFOR data library contains experimental nuclear reaction data for incident neutrons, charged particles, and photons.

It includes more than 15500 experiments andcovers nearly all of neutron-induced reaction experimental data up to the pion threshold.

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Evaluated Nuclear (reaction) Data File Evaluated Nuclear (reaction) Data File (www.nndc.bnl.gov/endf2)(www.nndc.bnl.gov/endf2)

The latest version of the library ENDF/B-VII beta2contains neutron cross sections for 393 isotopes from 10

-5 eV to 20 MeV:

8 nuclear data standards, 20 thermal scattering, 48 proton, 163 photo-nuclear, 3830 decay and 10 charged-particle files.

The final version of ENDF/B-VII library and a new Web applicationwill be released in 2006.

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

ENDF/B-VII beta2ENDF/B-VII beta2

Nuclear astrophysics s-process calculations require Maxwellian average neutron capture cross sections.

Evaluated neutron capture cross sections for the entire ENDF/B-VII beta2 nuclear data library were processed with ENDF utility code INTER for data points

in 10-5 to 20 MeV energy

range.

0)exp(

0)exp()(

2

dEkTEE

dEkTEEE

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

ENDF/B-VII beta2 & ENDF/B-VII beta2 & 151151

Sm(n,Sm(n,))

The calculated Maxwellianaverage capture cross section at 30 keV for 151

Sm(n,) reaction is 3045 mb, which is in excellent agreement with 3031(82) mb and 3100(160) mb measured by Wisshak et al. [6] and Abbondanno et al. [7], respectively.

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Atlas of Neutron Resonances IAtlas of Neutron Resonances I

Atlas of Neutron Resonances reference book (www.nndc.bnl.gov/atlas) represents the neutron data for 98 elements and 486 ground and isomeric states of 476 isotopes (381 isotopes with resonance data).

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Atlas of neutron Resonances IIAtlas of neutron Resonances II

It includes evaluated (n,) cross sections for 186 isotopes at 30 keV.

Data are shown as a function of neutron number N of s-process nuclei. Cross section values plunge near the neutron closed shells at N = 20,28,50,82, and 126.

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Atlas of Neutron Resonances IIIAtlas of Neutron Resonances III

= 3100(160) mb

Data Needs in Nuclear Astrophysics, Basel, June 23-25, 2006

Conclusion & OutlookConclusion & Outlook

• NNDC has been in business for more than 50 years

• NNDC has computer/Web/nuclear data expertise

• NNDC will continue to provide data for nuclear astrophysics community

• NNDC is a cost-free Web platform for nuclear astrophysics applications