| Project/Area Number |
17540241
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Particle/Nuclear/Cosmic ray/Astro physics
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| Research Institution | Niigata University |
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Principal Investigator |
OHYA Susumu Niigata University, Institute of Science and Technology, Professor (90092676)
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| Co-Investigator(Kenkyū-buntansha) |
OHTSUBO Takashi Niigata University, Institute of Science and Technology, Associate Professor (70262425)
IZUNIKAWA Takuji Niigata University, Radio- isotope Center, Associate Professor (60282985)
MUTO Suguru KEK, Neutron Science Laboratory, Assistant Professor (90249904)
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| Project Period (FY) |
2005 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,700,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥300,000)
Fiscal Year 2007: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2006: ¥800,000 (Direct Cost: ¥800,000)
Fiscal Year 2005: ¥1,600,000 (Direct Cost: ¥1,600,000)
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| Keywords | Experimental Nuclear Physics / Nuclear Orientation / Radiation, X-ray, Particle / Internal Magnetic Field / トンネル現象 |
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| Research Abstract |
The aim of this research is to study Coulomb potential effect on the angular distribution of α and β- rays using low-temperature nuclear orientation In order to improve the resolution of Si detectors, we reconstructed the tail pans of a ^3He/^4He dilution refrigerator. The Si detectors installed at 0.7 K shield are connected with the pre-amps which set outside by two short lines. However, it did not make the resolution of the Si detectors better owing to a change of a noise wave level. Therefore, we used the previous method to connect with the pre-amp from the top of the ^3He/^4He dilution refrigerator by about 1m lines.
We investigated the ^<95>ZrNi nuclear orientation with Australian group at Canberra The result of anisotropy of β-ray from ^95ZrNi at 10 mK was small about 2%. We also measured the hyperfine field of ^<59>FeNi using P-ray NMR-ON method at 7 mK The result was -28.33(3) T which is in good agreement with -28. 3(3) T reported previously. Also, the relaxation time was determined as 30(25) s at the external magnet field of 0.1 T We tried to make ^<241>Am α-ray samples. At first, a drop (about 5 kBq) of ^241AmCl_3 on a glass plate was evaporated to dryness. The resolution of the 5.485-MeV α-ray was 33 keV using a Si detector. To diffuse ^<241>Am into Fe, ^<241>AmCl_3 on an iron foil sample was heated at 900 degree for 5 min in an atmosphere of hydrogen. However, there is no change of the spectrum of α-ray before and after the diffusion. It seems to be no diffusion into iron. The resolution of a-ray on iron was 130 keV due to melted iron with HCl. In order to make good samples, we need implantation of ^<241>Am into iron with a mass-separator.
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