Alpha-decay from the 3.5 eV isomer of 229Th.
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Accession number;02A0151803
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| Title;Alpha-decay from the 3.5 eV isomer of 229Th. |
| Author;
MITSUGASHIRA T
(The Oarai-branch, Inst. Mat. Res., Tohoku Univ., Japan)
HARA M
(The Oarai-branch, Inst. Mat. Res., Tohoku Univ., Japan)
OHTSUKI T
(The Labo. Nucl. Sci., Grad. School Sci., Tohoku Univ., Japan)
YUKI H
(The Labo. Nucl. Sci., Grad. School Sci., Tohoku Univ., Japan)
TAKAMIYA K
(Res. Reactor Inst., Kyoto Univ., Japan)
KASAMATSU Y
(Grad. School Sci., Osaka Univ., Japan)
SHINOHARA A
(Grad. School Sci., Osaka Univ., Japan)
KIKUNAGA H
(Grad. School National Sci. Technol., Kanazawa Univ., Japan)
NAKANISHI T
(Fac. Sci., Kanazawa Univ., Japan)
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Journal Title;Abstracts of Papers. Symposium on Radiochemistry
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Journal Code:F0139B
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ISSN:1345-2762
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VOL.45th;NO.;PAGE.25(2001)
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| Figure&Table&Reference;FIG.1 |
| Pub. Country;Japan |
| Language;English |
| Abstract;The main decay mode from 3.5 eV isomer of 229This a direct .GAMMA.-transition. The observation of 3.5 eV transition is quite difficult. Thus, we selected novel radiochemical approach to search the minor alpha-decay from 229mTh producing it by Bremsstrahlung irradiation. The selected reactions are 230Th(.GAMMA.,n) 229mTh and 232Th(.GAMMA.,p2n) 229Ac229mTh. The Bremsstrahlung irradiation was carried out using the electron linear accelerator of Tohoku Univ.. After the irradiation, the mixture of 230Th, 229mTh, and 228Th was isolated and the spectrum was traced. We observed the production of new emitter with its half-life of about 15 hours between the alpha-peaks of 230Th and 228Th. The energy of the decaying component is consistent with that expected for 229Th. (author abst.) |
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