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Neutrino detector, or also called as neutrino observatory, is a facility to detect the existence of neutrino. Neutrino is any of three electrically neutral elementary particles in the lepton family . There are three kinds of neutrino. According to the Standard Model of particle physics, there are three different kinds of neutrinos: electron neutrinos (which are the ones produced in the sun and the ones detected by the above-mentioned experiments, in particular the chlorine-detector Homestake Mine experiment), muon neutrinos, and tau neutrinos . It is a part of a smallest thing in the world. So, it is normal if people often called neutrino as something mysterious. It also called as “particles from outer space that are almost undetectable” or “one of the most elusive elementary particles travels through space” . But, it “small ghost” is very interesting for many researchers over the world; it is important ‘tools’ to learn about sun. How come? The answer is because of the neutrino formation in space. Researches believe that neutrino is a result of certain types of radioactive decay or nuclear reactions such as those that take place in the sun, in nuclear reactors, or when cosmic rays hit atoms . That’s the key: neutrino is also resulted from the nuclear reaction in the sun. So, it is way to thinking about: if we can detect the result, we can predict the process. For example, if we taste the sweet in our cake, we can predict that some sugar or saccharin is added in the cooking process of our cake. It is how we should think; if neutrino is really made and can be detected, the theory that believed by the researchers that there are some nuclear reactions (in term of fusion reaction) in our sun should be true also. So, many neutrino detectors are built. It is the most possible way to prove the reaction happened in the sun, because it is really impossible to prove it by visiting the sun. Read more
There are many neutrino detectors over the world, with their own special facilities and for special purpose; to detect . For example Super-Kamiokande (Super-K) in the city of Hida, Gifu Prefecture, Japan. The observatory was designed to search for proton decay, study solar and atmospheric neutrinos, and keep watch for supernovas in the Milky Way Galaxy. Super-K is filled with water. A neutrino interaction with the electrons or nuclei of water can produce a charged particle that moves faster than the speed of light in water (although of course slower than the speed of light in vacuum). This creates a cone of light known as Cherenkov radiation, which is the optical equivalent to a sonic boom . So, the main purpose of Super-K is to detect the electron neutrinos. In Homestake Mine in USA, there is also a neutrino detector that not filled with water but filled with cleaning fluid, tetrachloroethylene . In Canada, a neutrino detector is also build named Sudbury Neutrino Observatory (SNO) and it use heavy water.
Now, back to the very basic question; are the detector and the experiment of neutrino, important for humankind? Yeah the answer might be various, depend the people who answer. For the researchers that concern about the out space, the answer is yes; because it can help us to understand more about the out space, to understand how sun and universe formed, and to predict what would be happened in the next time. But, for the others, the answer might be different; they might answer no; because there are still a lot of problem that more important to be solved, for example the hunger, war, oil decreasing, disease, etc. So, what will our country do, is neutrino detector will build in Indonesia in next years? To answer that question, it is better to take a look on the money needed for build that; because until now, the most hampered factors in doing research in Indonesia is money; beside human resources factor.
To build neutrino detector, lot of money is needed; it is something that can not be neglected. Neutrino detector technology is ‘hold’ by UK , so if a country wants to make a neutrino detector it should use UK’s expert and as consequence, the fee is based on their regulation. In 2001, the fee needed to build the neutrino detector is £ 2 – 3 Billion  or equal with 1.5 X 1013 until 3 X 1013 Rupiahs. It is really a huge amount of money in that time, let alone now in 2009. Are we have enough money budgeted for do that? The answer is no, because government not budgeted the ideal amount of money for research (especially for higher education research); the researchers in higher education only get 5 X 107 Rupiahs . But, the money is still not enough although if the government gives the ideal amount. Beside that, there are still a lot of problems in Indonesia, not only common problem (such us hunger, disease, poverty) but also the science development problem. So, it seems that it is more important to developing the science and research field first, before we build the neutrino detector; because the advantages of it is more applicable and wider for Indonesians than the advantages of building neutrino detector. So, we may conclude that it is impossible to build neutrino detector in Indonesia.
 (2003).The American Heritage Desk Dictionary. Houghton Mifflin Company