5.2.15. Muon production model

Table 5.2.133 igmuppd

Value	Explanation
(D=0)	Options for photon-induced muon-pair production.
=0	This reaction mechanism is not considered.
=1	This reaction mechanism is considered. If you take into account for multiple Coulomb scattering of the generated muons, please set nspred=-2.

Table 5.2.134 gmumul

Value	Explanation
(D=1.0)	Multiplying factor to increase sampling probability of photon-induced muon-pair production.

• For muon pair production caused by positrons \((e^+ e^- \to \mu^+\mu^-)\) , please refer to the [ User Defined Interaction ] section.

• See the reference [1] for more details of muon-pair production by igmuppd.

[1]

Y. Sakaki et al., Implementation of muon pair production in PHITS and verification by comparing with the muon shielding experiment at SLAC, Nucl. Instr. & Meth. A 977, 164323 (2020).