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Energy values determined from curvature measurements of 75 cloud-chamber tracks of decay particles of cosmic-ray mesotrons at sea level, in a magnetic field of 7250 gauss, are here reported. The observed spectrum extends from 9 Mev to 55 Mev with an apparently continuous distribution of intermediate energy values and a mean energy of 34 Mev. The shape of the spectrum and the value of its upper limit are strong evidence that the mesotron disintegrates into an electron and two neutrinos. It is concluded that the mesotron has half-integral spin. The value of the observed upper limit of the energy spectrum corresponds to a mass value of the mesotron equal to 217±4 electron masses.
This 1939 book provided readers with a concise explanation of contemporary developments in the understanding of cosmic rays.
The Radiation Laboratory in Berkeley, California, was the birthplace of particle accelerators, radioisotopes, and modern big science. This first volume of its history is a saga of physics and finance in the Great Depression, when a new kind of science was born. Here we learn how Ernest Lawrence used local and national technological, economic, and manpower resources to build the cyclotron, which enabled scientists to produce high-voltage particles without high voltages. The cyclotron brought Lawrence forcibly and permanently to the attention of leaders of international physics in Brussels at the Solvay Congress of 1933. Ever since, the Rad Lab has played a prominent part on the world stage. The book tells of the birth of nuclear chemistry and nuclear medicine in the Laboratory, the discoveries of new isotopes and the transuranic elements, the construction of the ultimate cyclotron, Lawrence's Nobel Prize, and the energy, enthusiasm, and enterprise of Laboratory staff. Two more volumes are planned to carry the story through the Second World War, the establishment of the system of national laboratories, and the loss of Berkeley's dominance of high-energy physics.
At the end of the nineteenth century, some physicists believed that the basic principles underlying their subject were already known, and that physics in the future would only consist of filling in the details. They could hardly have been more wrong. The past century has seen the rise of quantum mechanics, relativity, cosmology, particle physics, and solid-state physics, among other fields. These subjects have fundamentally changed our understanding of space, time, and matter. They have also transformed daily life, inspiring a technological revolution that has included the development of radio, television, lasers, nuclear power, and computers. In Quantum Generations, Helge Kragh, one of the world's leading historians of physics, presents a sweeping account of these extraordinary achievements of the past one hundred years. The first comprehensive one-volume history of twentieth-century physics, the book takes us from the discovery of X rays in the mid-1890s to superstring theory in the 1990s. Unlike most previous histories of physics, written either from a scientific perspective or from a social and institutional perspective, Quantum Generations combines both approaches. Kragh writes about pure science with the expertise of a trained physicist, while keeping the content accessible to nonspecialists and paying careful attention to practical uses of science, ranging from compact disks to bombs. As a historian, Kragh skillfully outlines the social and economic contexts that have shaped the field in the twentieth century. He writes, for example, about the impact of the two world wars, the fate of physics under Hitler, Mussolini, and Stalin, the role of military research, the emerging leadership of the United States, and the backlash against science that began in the 1960s. He also shows how the revolutionary discoveries of scientists ranging from Einstein, Planck, and Bohr to Stephen Hawking have been built on the great traditions of earlier centuries. Combining a mastery of detail with a sure sense of the broad contours of historical change, Kragh has written a fitting tribute to the scientists who have played such a decisive role in the making of the modern world.
A distinctive collection of essays, discussions, and personal descriptions of the evolution of particle physics.
1. The world of particle physics 2. Voyage into the atom 3. The structure of the atom 4. The extraterrestrials 5. The cosmic rain 6. The challenge of the big machines 7. The particle explosion 8. Colliders and image chambers 9. From charm to top 10. The 'whys' of particle physics 11. Futureclash 12. Particles at work Table of particles Further reading/acknowledgements Picture credits Index