In this invited response we answer all comments by Engelen and Hansen. We point out that the superfluid and superconductive properties of H(0) have been published previously. We explain some differences between covalently bonded molecules and the molecules in the ultradense matter H(0) form, and explain some aspects of the energetics of H(0) molecules during Coulomb explosions. We point out that the experimental spectra shown in our

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We here report muon and gamma photon signatures from decay of neutral kaons K0L and K0sto complement the published results of kaon generation from laser-induced baryon annihilation in H(0) (Holmlid and Olafsson, High Energy Density Physics 2021, and Holmlid, International Journal of Hydrogen Energy 2021). One well-known complication in the kaon detection is the oscillation process between the neutral kaons K0L and K0s caused by interaction with matter. Particle energy measurements with plastic scintillators identify one process which generates two muons simultaneously from one mode of decay of . Particle energy measurements with Al converters (without scintillator) in the separated, enclosed charged particle detector identify further modes of decay of K0L and K0s, all producing a few simultaneous high-energy gamma photon peaks in the approximate energy range 20 - 100 MeV. Neutral kaons are observed only when ultradense hydrogen H(0) is deposited in the meson generator. The results presented are mainly from spontaneous reactions in H(0). The experimental setup uses an enclosed PMT with Al foil converter and a multichannel analyzer (MCA) for pulse energy analysis. Using this method the radiation damage from neutral kaons can be investigated. Due to the low cross section of the neutral kaons in interaction with matter there exists no other method to identify them with certainty outside large physics laboratories.

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