| Project/Area Number |
02044056
|
|---|
| Research Category |
Grant-in-Aid for international Scientific Research
|
| Allocation Type | Single-year Grants |
|---|
| Section | Joint Research |
|---|
| Research Institution | Niigata University |
|---|
Principal Investigator |
OHYA S. Faculty of Science, Niigata University, 理学部, 助教授 (90092676)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
RIKOVSKA Sto オックスフォード大学, クラレドン研究所, 研究員
STONE N. J. Clarendon Laboratory, Oxford University, クラレンドン研究所, 講師
陸路 直 新潟大学, 理学部, 教授 (90004267)
RIKOVSKA-STONE J. Clarendon Laboratory, Oxford University
MUTSURO N. Faculty of Science, Niigata University
|
|---|
| Project Period (FY) |
1990
|
| Project Status |
Completed (Fiscal Year 1990)
|
| Budget Amount *help |
¥2,000,000 (Direct Cost: ¥2,000,000)
Fiscal Year 1990: ¥2,000,000 (Direct Cost: ¥2,000,000)
|
|---|
| Keywords | Low-temperature nuclear orientation / Internal magnetic field / Relaxation time |
|---|
| Research Abstract |
Following experiments for Au nuclear region have done at CERN using ISOLDE and NICOL facilities. For ^<184>Au, the two isomers are found and these half-life are 53 s and 12 s. The spin of the two isomers are proposed to be either 2, 5 or 3, 6. The intention to study Time Resolved Nuclear Orientation of ^<181>Au was rendered impossibly by the highly fragmented decay of this isotope and the overwhelming intensity of radiations from the ^<181>Hg primary implant which has comparable half-life. Accordingly this measurement needs to await the availability of separated gold beams at ISOLDE. To replace the ^<181>Au TR-OLNO study, the systematic measurement of ground state properties of proton rich nuclei below Z=82 implanted at the NICOL facility was extended to the lightest accessible Ir isotopes, ^<183-176>Ir. Measurements were made on the temperature depedence of orientation of the isotope ^<183>Ir, ^<182>Ir, ^<180>Ir, ^<179>Ir (by alpha decay of ^<183>Hg), ^<178>Ir (by alpha decay of ^<182>Hg) and ^<176>Ir (by alpha decay of ^<180>Hg). Large effects were observed and these experiments are now being analyzed.
In Niigata Univ. NMR-ON measurements have been performed for ^<124>INi at low temperature of 8 mK. The magnetic hyperfine splitting frequency was determined to be 165.8 (1) MHz. With the known magnetic moment of ^<124>I, the hyperfine field could be determined as B_<HF>(^<124>INi)=30.08 (8) T. The effective relaxation time was determined to be 3.7 (7) s at 8 mK and with the external magnetic field of 0.2 T.
|
