FOREWORD

The XVth Intemational Conference on Neutrino Physics and Astrophysics, held in Granada, Spain, from 7 to 12 June, 1992, was organized by the Institute of Nuclear and High Energy Physics of the University of Zaragoza and sponsored by the Spanish Ministry of Education and Science, the National Committee for Science and Technology (CICYT), and the Andalusian Autonomous Govemment. The Conference Site was the "Manuel de Falla" Auditorium, a concert hall located within the Alhambra gardens, on the hills overlooking the C ~ of Granada. This wonderful and relaxing scenery verily contributed to the smooth development of the tight program of the Conference. The meeting was attended by 260 physicists from 25 countries.

Consolidated during the last twenty years as the main meeting on Neutrino Science, the format of the XVth Session followed a well-established, traditional pattern of invited talks and selected contributions, delivered in plenary sessions only. As is customary, the various fields of Neutrino Science were reviewed; novel, significant results presented and recent progress or future projects reported. Inherited also from previous Sessions, this Conference opened and closed its discourse with general talks outlining the status of the field and summarizing the main results of the Conference. Concerning the topics dealt with, a choice was imposed for obvious reasons of time availability. Some topics are but revisited questions, recurrent in almost all the Neutrino Conferences, as many facets of the neutrino are still to be solved; others have been included according to its relevance or current interest. For such a task, the Chairman has benefited from the invaluable cooperation of the various Committees, which are gratefully acknowledged.

To cover the present and the future of the Neutrino Science, both for neutrinos from accelerator or non-accelerator origin, from the inner or outer space; to review the various properties of the neutrino, the features of their interactions, the achievements or shortcomings of the theoretical descriptions; and to overview the merging field of Cosmology, Astrophysics and Particle Physics from which neutrinos participate, has resulted in a dense program of more than seventy talks. We expect that the contents of this volume, which includes most of the talks delivered at the Conference, will appeal to your interest. There were many remarkable contributions which make the gathering of Granada worthwhile remembering. But it should be said, without hesitation, that the Solar Neutrino Session on Monday afternoon, and in particular the presentation of the first Gallex results, will mark a cornerstone in Neutrino history. The lively discussion which followed, and the participation in it of various historic scientists of Neutrino Physics, will prevail in our memory.

We will also remember the various activities which rounded up such a good time in Granada and in Andalusia, where the events celebrating the Vth Centenary of the Discovery of Amedca were taking place. (The Reception in the 14th-century Hospital Real, which houses the University of Granada; the Concert and Reception in the carmen Palacio de los Cbrdova and its breathtaking view of the Alhambra Palace and Fortress, the visit to the Expo'92 at Seville, the Neo-Moorish site of the Conference Dinner and the peaceful strolls along the old winding streets of Granada.)

We are indebted to the International Neutrino Committee for its confidence, and to its Secretary, Georgy Marx, for having wilfully pursued the celebration of this Conference in Spain. The members of the Advisory and Organizing Committees deserve our gratitude for their advice and cooperation in the preparation of the Conference. Special thanks are due to the staff and members of the Institute of Nuclear and High Energy Physics of the University of Zaragoza for their invaluable help in the organization of Neutrino 92 and in the coordination of the activities in Granada. The Universities of

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Granada, Sevilla and Zaragoza (institutionally and through some of their very cooperative members) are also acknowledged for their assistance, auspices and support. Other institutions to be mentioned for their sponsorship, collaboration or support, besides the National and Autonomous Agencies cited above, are the Municipality of Granada, the Aragonese Autonomous Government (DGA through the CONAI Agency), Anadig Ingenieros (Madrid), Ibercaja (Zaragoza), and the Canada Pavillion at Expo'92 (Seville).

Angel Morales