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  • PESAN DAN TANGGAPAN :

    The 2002 Nobel Prize in Physics
    Oleh : Nobel Foundation
    Sabtu, 12 Oktober 2002 (20:27 WIB) dari IP 202.159.21.25

    The 2002 Nobel Prize is being awarded with one half jointly to:

    RAYMOND DAVIS JR., and MASATOSHI KOSHIBA for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos

    and the other half to:

    RICCARDO GIACCONI for pioneering contributions to astrophysics, which have led to the discovery of cosmic X-ray sources


    RE:The 2002 Nobel Prize in Physics
    Oleh : Nobel Foundation
    Sabtu, 12 Oktober 2002 (20:32 WIB) dari IP 202.159.21.25

    Press Release: The 2002 Nobel Prize in Physics

    8 October 2002

    The Royal Swedish Academy of Sciences has decided to award the Nobel Prize in Physics for 2002 with one half jointly to

    Raymond Davis Jr
    Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, USA, and

    Masatoshi Koshiba
    International Center for Elementary Particle Physics, University of Tokyo, Japan

    ?for pioneering contributions to astrophysics, in particular for the detection of cosmic neutrinos?

    and the other half to

    Riccardo Giacconi
    Associated Universities Inc., Washington DC, USA

    ?for pioneering contributions to astrophysics, which have led to the discovery of cosmic X-ray sources?.

    Two New Windows on the Universe

    The Earth lies in the path of a continuous flux of cosmic particles and other types of radiation. This year?s Nobel Laureates in Physics have used these very smallest components of the universe to increase our understanding of the very largest: the Sun, stars, galaxies and supernovae. The new knowledge has changed the way we look upon the universe.

    The mysterious particle called a neutrino was predicted as early as 1930 by Wolfgang Pauli (Nobel Prize in 1945), but it would take 25 years to prove its existence (by Frederick Reines, Nobel Prize in 1995). This is because neutrinos, which are formed in the fusion processes in the Sun and other stars when hydrogen is converted into helium, hardly interact at all with matter and are therefore very difficult to detect. For example, thousands of billions of neutrinos pass through us every second without our noticing them. Raymond Davis Jr constructed a completely new detector, a gigantic tank filled with 600 tonnes of fluid, which was placed in a mine. Over a period of 30 years he succeeded in capturing a total of 2,000 neutrinos from the Sun and was thus able to prove that fusion provided the energy from the Sun. With another gigantic detector, called Kamiokande, a group of researchers led by Masatoshi Koshiba was able to confirm Davis?s results. They were also able, on 23 February 1987, to detect neutrinos from a distant supernova explosion. They captured twelve of the total of 1016 neutrinos (10,000,000,000,000,000) that passed through the detector. The work of Davis and Koshiba has led to unexpected discoveries and a new, intensive field of research, neutrino-astronomy.

    The Sun and all other stars emit electromagnetic radiation at different wavelengths, both visible and invisible light, e.g. X-rays. In order to investigate cosmic X-ray radiation, which is absorbed in Earth?s atmosphere, it is necessary to place instruments in space. Riccardo Giacconi has constructed such instruments. He detected for the first time a source of X-rays outside our solar system and he was the first to prove that the universe contains background radiation of X-ray light. He also detected sources of X-rays that most astronomers now consider to contain black holes. Giacconi constructed the first X-ray telescopes, which have provided us with completely new ? and sharp ? images of the universe. His contributions laid the foundations of X-ray astronomy.

    ---------------------------------

    Raymond Davis Jr, born 1914 (87 years), in Washington, DC, USA (US citizen). PhD in Chemistry 1942 at Yale University, Connecticut, USA. Professor Emeritus at the Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, USA.

    Masatoshi Koshiba, born 1926 (76 years), in Toyohashi , Aichi, Japan (Japanese citizen). PhD 1955 at the University of Rochester, New York, USA. Professor Emeritus at the International Center for Elementary Particle Physics, University of Tokyo, Japan.

    Riccardo Giacconi, born 1931 (71 years), in Genoa, Italy (US citizen). PhD 1954 at the University of Milan. President of Associated Universities, Inc., Washington, DC, USA.


    Prize amount: SEK 10 million. Davis and Koshiba share one half and Giacconi receives the other half.


    Re: The 2002 Nobel Prize in Physics
    Oleh : Jawa Pos
    Sabtu, 3 Januari 2004 (21:15 WIB) dari IP 202.159.34.129

    9 Oktober 2002
    Pionir Astrofisik Raih Nobel


    STOCKHOLM - Setelah Nobel Kedokteran (kesehatan), kemarin giliran diumumkan pemenang hadiah Nobel Fisika. Tiga ilmuwan asal AS dan Jepang --Raymond Davis Jr, Riccardo Giacconi, dan Masatoshi Koshiba-- mendapatkan penghargaan itu karena menjadi pionir dalam memberi kontribusi pada astrofisik.


    Davis, 87, dan Koshiba, 76, berhasil mendeteksi cosmic neutrinos. Sedangkan Giacconi, 71, menemukan sumber kosmik sinar X. Mereka berbagi hadiah. Davis dan Koshiba masing-masing mendapat dua setengah juta kroner (USD 250 ribu atau Rp 2,25 miliar), sedangkan Giacconi mendapat lima juta kroner (USD 500 ribu atau Rp 4,5 miliar).


    "Kebun binatang baru yang fantastik dan bentuk-bentuk aneh sudah ditemukan dan dipelajari. Hari ini jagad raya melihat lebih banyak daripada yang kita percayai 50 tahun lalu. Semua berkat astronomi sinar X," bunyi pernyataan juri. "Peraih Nobel Fisika tahun ini menggunakan komponen jagad raya yang sangat kecil untuk meningkatkan pemahaman mengenai matahari, bintang, galaksi, dan supernova."


    Setelah melakukan penelitian selama lebih dari 30 tahun, Davis membuktikan bahwa energi nuklir matahari bukan berasal dari atom atau fisinya, melainkan dari penyatuan atau fusinya. Dalam risetnya, Davis menggunakan tank raksasa berisi 600 ton cairan, yang diletakkan di bawah tambang guna mendeteksi neutron, partikel yang dilepaskan dalam jumlah triliunan melalui proses perubahan hidrogen menjadi helium pada matahari. Koshiba meneruskannya dengan mengembangkan detektor neutron yang menangkap belasan partikel dari jauh, yang dikenal sebagai supernova.


    Davis adalah profesor University of Pennsylvania, dan Koshiba pensiunan guru besar di International Centre for Elementary Particle Physics di Tokyo. Sedangkan Giacconi adalah presiden Associated Universities Inc. di Washington, DC. (afp/ap/rtr/eia)


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