In the context of modern scientific research, consider the following statements about ‘IceCube’, a particle detector located at South Pole, which was recently in the news :

1. It is the world’s largest neutrino detector, encompassing a cubic kilometre of ice.

2. It is a powerful telescope to search for dark matter.

3. It is buried deep in the ice.

Which of the statements given above is/are correct?

The correct option is 1, 2 and 3 only.

Let's analyze each statement in detail to understand why all of them are correct:

Statement 1 is correct: IceCube is indeed the world's first and largest gigaton-scale neutrino detector. It is designed to observe high-energy neutrinos, which are nearly massless, neutral subatomic particles that travel almost at the speed of light. The detector is massive, instrumenting a volume of one cubic kilometer of clear Antarctic ice.

Statement 2 is correct: Although its primary objective is to detect cosmic neutrinos, IceCube also functions as a powerful telescope to search for dark matter. It searches for indirect signatures of dark matter, specifically looking for neutrinos that would be produced when hypothetical dark matter particles—such as Weakly Interacting Massive Particles (WIMPs)—annihilate or decay after accumulating in gravitational wells like the Sun, the Earth, or the center of our galaxy.

Statement 3 is correct: The detector is buried deep within the Antarctic ice sheet. Its sensors, known as Digital Optical Modules (DOMs), are suspended on strings deployed at depths ranging from 1,450 meters to 2,450 meters below the surface. This extreme depth is crucial because the thick layer of ice above acts as a natural shield, filtering out background radiation from atmospheric cosmic rays and allowing the detector to identify rare neutrino interactions.

Since all three statements are accurate, the correct option is 1, 2 and 3 only.