Search for α-decay of 229mTh produced from 229Ac β-decay following 232Th(γ, p2n) reaction

H. Kikunaga; Y. Kasamatsu; K. Takamiya; T. Mitsugashira; M. Hara; T. Ohtsuki; H. Yuki; A. Shinohara; S. Shibata; N. Kinoshita; A. Yokoyama; T. Nakanishi

doi:10.1524/ract.2005.93.9-10.507

Search for α-decay of ^229mTh produced from ²²⁹Ac β-decay following ²³²Th(γ, p2n) reaction

H. Kikunaga, Y. Kasamatsu, K. Takamiya, T. Mitsugashira, M. Hara, T. Ohtsuki, H. Yuki, A. Shinohara, S. Shibata, N. Kinoshita, A. Yokoyama, T. Nakanishi

Research Center for Electron Photon Science (ELPH)

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

We produced ²²⁹Th in the nuclear reaction ²³²Th(γ, p2n)²²⁹Ac, followed by disintegration to ^229m,gTh. The ^229mTh α-decay was searched for. Alpha-particle events of energy between 4.93 MeV and 5.05 MeV were observed in the separated thorium sample of β-decay products from an actinium source highly purified from the ²³²Th + γ reaction products. The energies of the α-particles coincide with those expected for ^229mTh.

Original language	English
Pages (from-to)	507-510
Number of pages	4
Journal	Radiochimica Acta
Volume	93
Issue number	9-10
DOIs	https://doi.org/10.1524/ract.2005.93.9-10.507
Publication status	Published - 2005

Keywords

Actinium
Bremsstrahlung irradiation
Chemical treatment
Electron bridge mechanism
Nuclear isomer
Thorium-229

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10.1524/ract.2005.93.9-10.507

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title = "Search for α-decay of 229mTh produced from 229Ac β-decay following 232Th(γ, p2n) reaction",

abstract = "We produced 229Th in the nuclear reaction 232Th(γ, p2n)229Ac, followed by disintegration to 229m,gTh. The 229mTh α-decay was searched for. Alpha-particle events of energy between 4.93 MeV and 5.05 MeV were observed in the separated thorium sample of β-decay products from an actinium source highly purified from the 232Th + γ reaction products. The energies of the α-particles coincide with those expected for 229mTh.",

keywords = "Actinium, Bremsstrahlung irradiation, Chemical treatment, Electron bridge mechanism, Nuclear isomer, Thorium-229",

author = "H. Kikunaga and Y. Kasamatsu and K. Takamiya and T. Mitsugashira and M. Hara and T. Ohtsuki and H. Yuki and A. Shinohara and S. Shibata and N. Kinoshita and A. Yokoyama and T. Nakanishi",

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pages = "507--510",

journal = "Radiochimica Acta",

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T1 - Search for α-decay of 229mTh produced from 229Ac β-decay following 232Th(γ, p2n) reaction

AU - Kikunaga, H.

AU - Kasamatsu, Y.

AU - Takamiya, K.

AU - Mitsugashira, T.

AU - Hara, M.

AU - Ohtsuki, T.

AU - Yuki, H.

AU - Shinohara, A.

AU - Shibata, S.

AU - Kinoshita, N.

AU - Yokoyama, A.

AU - Nakanishi, T.

PY - 2005

Y1 - 2005

N2 - We produced 229Th in the nuclear reaction 232Th(γ, p2n)229Ac, followed by disintegration to 229m,gTh. The 229mTh α-decay was searched for. Alpha-particle events of energy between 4.93 MeV and 5.05 MeV were observed in the separated thorium sample of β-decay products from an actinium source highly purified from the 232Th + γ reaction products. The energies of the α-particles coincide with those expected for 229mTh.

AB - We produced 229Th in the nuclear reaction 232Th(γ, p2n)229Ac, followed by disintegration to 229m,gTh. The 229mTh α-decay was searched for. Alpha-particle events of energy between 4.93 MeV and 5.05 MeV were observed in the separated thorium sample of β-decay products from an actinium source highly purified from the 232Th + γ reaction products. The energies of the α-particles coincide with those expected for 229mTh.

KW - Actinium

KW - Bremsstrahlung irradiation

KW - Chemical treatment

KW - Electron bridge mechanism

KW - Nuclear isomer

KW - Thorium-229

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DO - 10.1524/ract.2005.93.9-10.507

M3 - Article

AN - SCOPUS:27744472629

SN - 0033-8230

VL - 93

SP - 507

EP - 510

JO - Radiochimica Acta

JF - Radiochimica Acta

IS - 9-10

ER -

Search for α-decay of ^229mTh produced from ²²⁹Ac β-decay following ²³²Th(γ, p2n) reaction

Abstract

Keywords

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