NIEL Tables for Electrons and Protons in GaAs

Tabulated values of NIEL in units of MeV cm2/g for electrons in GaAs obtained using the screened relativistic approach (discussed above) are available in Appendix 1 of  [Baur et al. (2014)] (the table is also available in Appendix of [Leroy and Rancoita (2016)]). These data are shown in Figure 1 for Ed =10, 21 and 25 eV.

 

 

Figure 1. NIEL in units of MeV cm2/g for electrons in GaAs as a function of the displacement threshold energy.

 

 

Baur et al. (2014) also determined NIEL for protons in GaAs: the table reporting these results is available in Appendix 1 therein (the table is also available in Appendix of [Leroy and Rancoita (2016)]).. These data are shown in Figure 2 for Ed =10, 21 and 25 eV. For proton energies lower than 200 ,keV, it was used the 4-terms analytical approximation of the ZBL cross section derived by Messenger et al. (2004) and the Thomas--Fermi screening length (Eq. (2.73) at page 95 of [Leroy and Rancoita (2011)] as suggested by ICRUM (1993) for incident protons. Using such a cross section, the so obtained nuclear stopping powers typically agrees with those found in [ICRUM (1993)] within a few percent. For protons, the NIEL contribution resulting from hadronic interactions was estimated by Baur et al. (2014) using the one from Jun et al. (2003) at Ed =10 eV. For displacement threshold energies of 21 and 25 eV, it was linearly reduced with respect to one found at 10 eV by the same amount found for the Coulomb contributions, i.e., by about 7.7 and 9.5%, respectively.

 

Figure 2. NIEL in units of MeV cm2/g for protons in GaAs as a function of the displacement threshold energy.

 

 

References

C. Baur, M. Gervasi, P. Nieminen, S. Pensotti, P.G. Rancoita, M. Tacconi, (2014), NIEL dose dependence for solar cells irradiated with electrons and protons, Proc. of the 14th ICATPP, September 23--27 2013, Villa Olmo, Como, Italy, S. Giani, C. Leroy, L. Price, P.G. Rancoita and R. Ruchti, Editors, World Scientific, Singapore, 698-713; ISBN: 978-981-4603-15-7; http://www.worldscientific.com/doi/pdf/10.1142/9789814603164_0111; http://arxiv.org/abs/1312.0402

 

ICRUM - International Commission on Radiation Units and Measurements - (1993), Stopping Powers and Ranges for Protons and Alpha Particles, ICRU Report 49, Bethesda, MD.

 

I. Jun et al. (2003), IEEE Trans. on Nucl. Sci 50, 1924-1928.

 

C. Leroy and P.G. Rancoita (2011),  Principles of Radiation Interaction in Matter and Detection - 3rd Edition -,World Scientific, Singapore, ISBN-978-981-4360-51-7; http://www.worldscientific.com/worldscibooks/10.1142/8200 .

 

 

 

9167.coverC. Leroy and P.G. Rancoita (2016), Principles of Radiation Interaction in Matter and Detection - 4th Edition -, World Scientific. Singapore, ISBN-978-981-4603-18-8 (printed); ISBN.978-981-4603-19-5 (ebook). http://www.worldscientific.com/worldscibooks/10.1142/9167; it is also partially accessible via google books.

To be noted that, by quoting WSRID20 upon checking out the shopping cart, a 20% discount will be obtained.
It is also available in kindle edition.

 

 

 

S.R. Messenger et al. (2004), IEEE Trans. on Nucl. Sci. 51, 2846-2850.