What's new in the Network Generator

• Latest Version (16/06/2023)
  • 90 New experimental reaction rates including 13 new reactions.
  • Includes now the possibility to use the ASTRAL database for neutron-capture reactions.
  • Updated mass models.
  • Redesign of the Website and additional funtionalities to select individual reactions.
• Version 10.0 (10/02/2012)
  • Include new experimental reaction rate database: Iliadis et. al. 2010, Nacre II 2011 (an Update and Extension of the NACRE Compilation of Charged-particle-induced Thermonuclear Reaction Rates for Astrophysics), experimental neutron capture reaction rate from the year 2005 to 2011.
  • Using new TALYS reaction rate instead of MOST reaction rate.
  • For charged particle induced reactions, using coulomb extrapolation when reaction rate data do not exist.
  • The neutron capture rates in TALYS result include specificing isomer state 'm' or ground state 'g'.
  • Some bugs are fixed in the code.
  • beta-decay rates calculated with the HFB-14 mass model are included to replace the results deduced by ETFSI mass model (Tachibana et al. 1990).
  • New Beta-dacay rates from Nishimura S. et.al. (2011), Phys. Rev. Lett 106, 052502 are included.
• Version 6.1 (21/06/2006)
  • A bug has been fixed in the individual reaction editor: reactions incorrectly coded as 1 LI 7 (1 PROT, 1 HE4 ) 1 HE 4 are rewritten as 1 LI 7 (1 PROT, 0 OOOOO) 2 HE 4. The rates generated with the former coding could have been very inaccurate (when derived from the Hauser-Feshbach library!).
• Version 6.0 (01/06/2005)
  • The web interface has been refurbished for the sake of clarity; the network may now be edited directly.
  • Reactions have been added to the network, most notably Descouvemont et al. (2004, Atomic Data Nuclear Data Tables 88, 203) compilation of reactions involved in Big Bang nucleosynthesis. Several other reactions have been added as well.
• Version 5.0 (19/11/2004)
  • NetGen has migrated to a much faster computer
  • The stellar enhancement factor is now computed for all reactions, including neutron capture reactions. The values used are clearly documented.
• Version 4.2.2 (30/04/2003)
  • The table of weak-interaction rates for nuclei in the mass range A=1 and A=17-39 from Oda et al. (1994, Atomic Data and Nuclear Data Tables 56, 231) has been added to the library.
• Version 4.2.1 (07/02/2003)
  • The Fortran routine reading the output file from NetGen and providing reaction rates at any temperature/density within the grid has been updated to handle density-dependent rates (some electronic captures are provided for as many as 11 electron-density values). This routine may be incorporated directly into the user nucleosynthesis program.
• Version 4.2 (11/09/2002)
  • Bug fixed: rates for reverse reactions computed from the Hauser-Feshbach library were wrong if they followed another reverse reaction in the network. Former users: please check this. Sorry for any inconvenience.
• Version 4.1 (20/12/2001)
  • The table of density- and temperature-dependent beta-decay and electron/positon capture rates from Goriely (1999, Astron. Astrophys. 342, 881; Table available in electronic form here), superseding that of Takahashi & Yokoi (1987, Atomic Data Nucl. Data Tables 36, 375), has been added in the library.
• Version 4.0 (20/11/2001)
  • Expert users now have the possibility to upload directly on the NetGen server files containing the temperature grid and the reaction network
  • The table of density- and temperature-dependent beta-decay and electron/positon capture rates from Langanke & Martinez (2000, Nucl. Phys. A 673, 481) has been added in the library.
• Version 3.3 (10/07/2001)
  • A list of all inclusions of new reaction rates to the database will be maintained
  • Bibliographic index 200 forces the use of Bao et al. table of neutron-capture cross sections (Bao et al., 2000, At. Data and Nucl. Data Tables 75, 1), even if more recent estimates are available
  • Choice now possible between lin or log temperature grid
• Version 3.2.1 (03/07/2001)
  • Bug fixed in fortran routine read_netgen_output.f
• Version 3.2.0 (15/12/2000)
  • Reactions may be interactively deleted from the network before computing the reaction rates
  • Duplicate reactions are automatically removed before computing the reaction rates
  • The reaction network is automatically ordered by increasing atomic masses
  • Iliadis et al. table of proton-capture rates on 20 < A < 40 nuclei (2000, ApJS 134, 151) has been included in the database
  • Bao et al. table of radiative neutron capture cross sections (At. Data and Nucl. Data Tables 75, 1) has been included in the database (only the rates based on experimental data have been included). It is now the default choice for radiative neutron-capture cross sections.
  • The new mass table of Goriely, Pearson and Tondeur (At. Data and Nucl. Data Tables, 2000, in press) using a mass formula based on Hartree-Fock + BCS is implemented in the database.
• Version 3.0 (15/11/1999)
  • NACRE rates may be chosen among nominal, low or high values
  • An e-mail warning is sent when the request has been completed. The file containing the reaction rates may be retrieved later on.
• Version 3.0 (14/07/1999)
  • It is now possible to generate automatically a network by giving Zmin and Zmax.
  • The left boundary of the isotopic range is defined by providing an offset (mass units) with respect to either the proton drip line or the proton-rich side of the stability valley, and the right boundary of the network is defined by providing an offset with respect to either the neutron-rich side of the stability valley or to the neutron drip line.
  • The following sets of reactions may be selected:
    • radiative proton captures (p,gamma)
    • (p,n), (p,alpha)
    • radiative neutron captures (n,gamma)
    • (n,p), (n,alpha)
    • radiative alpha captures (alpha,gamma)
    • (alpha,p), (alpha,n)
    • photodisintegrations: (gamma,p), (gamma,n), (gamma, alpha).
  • Beta-decays are automatically included, but spontaneous fission and alpha-fission reactions are not yet included.
  • Beta-decays with delayed proton, neutron or alpha emission have been included on light p-nuclei up to Ca.