| Project/Area Number |
26610063
|
|---|
| Research Category |
Grant-in-Aid for Challenging Exploratory Research
|
| Allocation Type | Multi-year Fund |
|---|
| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
|
|---|
| Research Institution | Yokohama National University |
|---|
Principal Investigator |
KATAYOSE Yusaku 横浜国立大学, 工学(系)研究科(研究院), 准教授 (90323930)
|
|---|
| Project Period (FY) |
2014-04-01 – 2016-03-31
|
| Project Status |
Completed (Fiscal Year 2015)
|
| Budget Amount *help |
¥3,770,000 (Direct Cost: ¥2,900,000、Indirect Cost: ¥870,000)
Fiscal Year 2015: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2014: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
|
|---|
| Keywords | 銀河系外宇宙線 / 空気シャワー / 音響波測定 / 空気シャワー観測 / 音波観測 |
|---|
| Outline of Final Research Achievements |
For the purpose of measuring extragalactic cosmic ray composition in an energy region larger than 10PeV, a new measurement technique using a sound wave was studied.
High-energy cosmic rays collide with the nucleus of the atmosphere and produce air-shower particles. When the air-shower particles that arrived at the water pool lose their energy underwater, an acoustic wave is produced in the water. The thermo-acoustic mechanism of sound generation by air-shower particles was studied by both a Monte-Carlo simulation and a measurement experiment with a YAG laser.There is a possibility of measuring cosmic rays with an energy greater than 100PeV using the acoustic wave detection method. The results also showed that the acoustic pulse has a bipolar waveform that depends on a primary particle. It was found that separation of a proton event and an iron event is possible using the rise time of an air-shower acoustic wave.
|
