SPACS  Calculation of SPAllation Cross Sections

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Description of the model

The semi-empirical SPACS model calculates cross sections of proton- and neutron-induced spallation residues with a deterministic method. A wide range of system size and bombarding energy is supported including proton- and neutron-induced spallation on light (around C) up to heavy (Pb, Bi) nuclei, over an energy range from around 50 MeV to a few hundred GeV (centre of mass). The restrictions in heavier systems are related to the fact that the code does not consider fission. Also, the lightest residues in spallation are underpredicted, because multifragmentation (that becomes important above center-of mass energies above several GeV) is not considered, and the light particles produced by evaporation (especially isotopes of hydrogen and helium) are not included.

Executables of the SPACS code for Windows[a] and Linux are available. They are easy to use: Just download the ZIP file, extract the files and run SPACS.exe (Windows [a]) or ./SPACS (Linux) in a command window on your computer! The file README.txt contains further information.

[a] Windows is either a registered trademark or a trademark of Microsoft
Corporation in the United States and/or other countries.

[1] "SPACS: A semi-empirical parameterization for isotopic spallation cross sections"
    C. Schmitt, K.-H. Schmidt, A. Kelic-Heil
    Phys. Rev. C 90 (2014) 064605
[2] "Erratum" to ref. [1]:   Phys. Rev. C 94 (2016) 039901
[3] "Complex nuclear-structure phenomena revealed from the nuclide production in 
     fragmentation reactions"
    M. V. Ricciardi, A. V. Ignatyuk, A. Kelic, P. Napolitani, F. Rejmund, K.-H. Schmidt, 
    O. Yordanov
    Nucl. Phys. A 733 (2004) 299
[4] "Even-odd effect in multifragmentation products: the footprints of evaporation"
    M. V. Ricciardi, K.-H. Schmidt, A. Kelic-Heil
    arXiv:1007.0386v1 [nucl-ex] (2010)

Required input of SPACS

Z and A of heavy reaction partner
Light reaction partner (n or p)
Bombarding energy

Quantities available on output of SPACS

Residue cross sections per isotope, as a function of A, and as a function of Z.


SPACS code (FreeBASIC version, release: September 18, 2016)

    Christelle Schmitt,
         GANIL, Boulevard Henri Becquerel, B.P. 5027
         14076 CAEN Cedex 5, France,
    Karl-Heinz Schmidt, 
         Rheinstrasse 4, 64390 Erzhausen, Germany,
    Aleksandra Kelic-Heil,
         GSI, Planckstrasse 1, 64291 Darmstadt, Germany