IUPAP-TIFR Homi Bhabha Medal Medal and Prize 2013 The IUPAP-TIFR Homi Bhabha Medal and Prize has been established by the IUPAP and the Tata Institute of Fundamental Research (TIFR), Mumbai (India) in 2010 to honour Homi Jehangir Bhabha, theoretical cosmic ray physicist well-known for Bhabha-Heitler Cascade theory and relativistic electron scattering. Homi Bhabha founded the TIFR in 1945 and initiated the nuclear energy program in India in 1951 with strong support from the well-known philanthropist and industrialist JRD Tata and the Government of India then led by Prime Minister Jawaharlal Nehru. Homi Bhabha initiated experimental programs for the study of cosmic ray particles and their interactions with instruments either carried aloft to the top of the atmosphere with balloons or placed in laboratories at high altitude or deep underground. The Homi Bhabha Medal and Prize consists of a certificate, a medal, a cheque for US$ 5000 and an invitation to visit the TIFR, Mumbai to give a public lecture and will be awarded biennially at the International Cosmic Ray Conferences (ICRCs), held generally in odd-numbered years. The IUPAP-TIFR Homi Bhabha Medal and Prize will be awarded to an active scientist who has made distinguished contributions in the field of high energy cosmic ray physics and astro-particle physics over an extended academic career. The winner of the prize will be selected by the members of the C4 Commission and a senior member of the cosmic ray group at TIFR nominated by the Director, TIFR. The winner of the 2013 prize will be presented the prize certificate at the ICRC 2013 in Rio de Janeiro, Brazil, in July 2013 and invited to visit the TIFR at a mutually convenient time sometime during the next 2 years to deliver a public lecture. The Director, TIFR will present the Homi Bhabha medal and a cheque for US$ 5000 to the winner on this occasion. The winner will be provided with reasonable travel expenses and local hospitality for the visit to Mumbai and other TIFR laboratories in India. The nominations for the prize to be awarded at the ICRC 2013 in Rio de Janeiro in July 2013 should be sent to Johannes Knapp, Chair of the Cosmic Ray Commission (C4) along with supporting information and letters from two co-sponsors at the following address: Dr. Johannes Knapp School of Physics and Astronomy University of Leeds, Leeds LS2 9JT, UK E-mail: firstname.lastname@example.org Nomination deadline: 28 February 2013 Self nominations will not be considered.