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Being a superluminous supernova (SLSN), PTF12dam can be explained by a$^{56}$Ni-powered model, a magnetar-powered model or an interaction model. Wepropose that PTF12dam is a pulsational pair instability supernova, where theouter envelope of a progenitor is ejected during the pulsations. Thus, it ispowered by double energy source: radioactive decay of $^{56}$Ni and a radiativeshock in a dense circumstellar medium. To describe multicolor light curves andspectra we use radiation hydrodynamics calculations of STELLA code. We foundthat light curves are well described in the model with 40M$_{\odot}$ ejecta and20-40M$_{\odot}$ circumstellar medium. The ejected $^{56}$Ni mass is about6M$_{\odot}$ which results from explosive nucleosynthesis with large explosionenergy (2-3)$\cdot$10$^{52}$ ergs. In comparison with alternative scenarios ofpair-instability supernova and magnetar-powered supernova, in interaction modelall the observed main photometric characteristics are well reproduced:multicolor light curves, color temperatures, and photospheric velocities.

Pulsational Pair-Instability Model for Superluminous Supernova PTF12dam: Interaction and Radioactive Decay