Detection of 5.5 MeV $\alpha$-particles with a Magnetic Calorimeter
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概要
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We report on the detection of signals from 5.5 MeV $\alpha$-particles with a Au:Er magnetic calorimeter. Since this device shows strong temperature dependence on magnetization, the incident particle energy is measured by a change in the degree of magnetization using a superconducting quantum interference device (SQUID). We fabricated a sensor made of Au doped with ${\sim}0.3$% Er in our laboratory, and irradiated it with 241 Am in a dilution refrigerator. The detected signals showed an average pulse height of 7 mV, corresponding to a 2 pA m2 change in the magnetic moment of the sensor, at a bath temperature of 80 mK under an external magnetic field of 0.1 mT.
- 2004-09-15
著者
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YAMASAKI Noriko
Institute of Space and Astronautical Science
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ISHISAKI Yoshitaka
Department of Physics, Tokyo Metropolitan University
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OSHIMA Tai
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency (JAXA)
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Ohashi Takaya
Department Of Physics Tokyo Metropolitan University
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Ishikawa Teru
Department Of Physics Tokyo Metropolitan University
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Sato Kosuke
Department Of Earth And Space Science Graduate School Of Science Osaka University
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Ohashi Takaya
Department of Physics, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji, Tokyo 192-0397, Japan
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Yamasaki Noriko
Institute of Space and Astronautical Science/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
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Oshima Tai
Institute of Space and Astronautical Science/JAXA, 3-1-1 Yoshinodai, Sagamihara, Kanagawa 229-8510, Japan
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