Not of dark matter, but something else.  Perhaps neutrinos, perhaps solar axions, perhaps radioactive pollution in the detector.

Dark energy, like dark matter, is unknown to us.

Roughly 5 percent of the Universe is normal matter, like stars, black holes,  planets, and us.

"Large-scale experiments like XENON1T have been designed to directly detect dark matter, by searching for signs of dark matter 'hitting' ordinary matter, but dark energy is even more elusive.".

Because the accelerated expansion of the Universe is only detectable on very large scales, and gravity works on local scales, any dark matter model that suggests a fifth force would also need to adequately explain why that force isn't obvious in our astronomical neighborhood.

"Our chameleon screening shuts down the production of dark energy particles in very dense objects, avoiding the problems faced by solar axions," Vagnozzi said.

Their results showed that dark energy particles from a strongly magnetic region of the Sun called the tachocline – between the radiative interior and the outer convective zone – could have produced the signal observed in the XENON1T data.

"It was really surprising that this excess could in principle have been caused by dark energy rather than dark matter," Vagnozzi said