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NSR database version of May 2, 2024.

Search: Author = Y.Shigekawa

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2024SH15      J.Radioanal.Nucl.Chem. 333, 1479 (2024)

Y.Shigekawa, X.Yin, A.Nambu, Y.Wang, H.Haba

Production and chemical separation of ²²⁹Pa toward observation of γ rays of ^229mTh

NUCLEAR REACTIONS ²³²Th(p, X)²²⁹Pa, E=30 MeV; measured reaction products, Eγ, Iγ. ^{228,229,230,232,233}Pa; deduced yields. Comparison with available data, chemical separation. The AVF cyclotron at RIKEN.

doi: 10.1007/s10967-023-09069-y
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2022KA01      Appl.Radiat.Isot. 179, 110006 (2022)

Y.Kasamatsu, M.Nagase, H.Ninomiya, E.Watanabe, Y.Shigekawa, N.Kondo, K.Takamiya, T.Ohtsuki, N.Shiohara, A.Shinohara

Coprecipitation with samarium hydroxide using multitracer produced through neutron-induced fission of ²³⁵U toward chemical study of heavy elements

NUCLEAR REACTIONS U(n, F)²⁴Na/⁹¹Sr/¹⁴⁰Ba/¹⁴⁰La/¹⁴¹Ce/¹⁴³Ce/¹⁵¹Pm/⁹⁵Zr/⁹⁷Zr/¹⁰³Ru/¹³¹I/¹³³I, E thermal; measured reaction products, Eγ, Iγ. ²³⁹Np; deduced coprecipitation yields. The research reactor in Institute for Integrated Radiation and Nuclear Science, Kyoto University (KURNS).

doi: 10.1016/j.apradiso.2021.110006
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2021SH28      Phys.Rev. C 104, 024306 (2021)

Y.Shigekawa, A.Yamaguchi, K.Suzuki, H.Haba, T.Hiraki, H.Kikunaga, T.Masuda, S.Nishimura, N.Sasao, A.Yoshimi, K.Yoshimura

Estimation of radiative half-life of ^229mTh by half-life measurement of other nuclear excited states in ²²⁹Th

RADIOACTIVITY ²³³Th(α)[source chemically purified by anion-exchange chromatography]; measured Eα, Iα, Eγ, Iγ, αγ-coin, half-life of levels in ²²⁹Th by αγ(t) using a passivated implanted planar Si (PIPS) detector for α detection, and LaBr₃(Ce) detector for γ radiation. ²²⁹Th; deduced levels, J, π, B(M1), B(E2). Comparison of transition probabilities with estimates from the Alaga rule for intraband transitions, and with previous experimental level T_1/2. ^229mTh; deduced radiative half-life of the 8.28-eV isomer from B(M1) estimated from Alaga Rule for the interband transitions, and compared with experimental and other theoretical values.

doi: 10.1103/PhysRevC.104.024306
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Data from this article have been entered in the XUNDL database. For more information, click here.

2020HA27      Phys.Rev. C 102, 024625 (2020)

H.Haba, F.Fan, D.Kaji, Y.Kasamatsu, H.Kikunaga, Y.Komori, N.Kondo, H.Kudo, K.Morimoto, K.Morita, M.Murakami, K.Nishio, J.P.Omtvedt, K.Ooe, Z.Qin, D.Sato, N.Sato, T.K.Sato, Y.Shigekawa, A.Shinohara, M.Takeyama, T.Tanaka, A.Toyoshima, K.Tsukada, Y.Wakabayashi, Y.Wang, S.Wulff, S.Yamaki, S.Yano, Y.Yasuda, T.Yokokita

Production of ²⁶⁶Bh in the ²⁴⁸Cm(²³Na, 5n)²⁶⁶Bh reaction and its decay properties

RADIOACTIVITY ^266,267Bh(α)[from ²⁴⁸Cm(²³Na, 5n), (²³Na, 4n), E=125.9, 130.6, 135.3 MeV]; ²⁶²Db(α), (SF)[from ²⁶⁶Bh α decay]; ²⁶³Db(EC), (α), (SF)[from ²⁶⁷Bh α decay]; ²⁶³Rf(SF)[from ²⁶³Db EC decay]; ²⁵⁸Lr(α), (EC)[from ²⁶²Db α decay]; ²⁵⁹Lr(α), (SF)[from ²⁶³Db α decay]; ²⁵⁸No(SF)[from ²⁵⁸Lr(EC); measured Eα, αα-, ααα- and α(SF)-correlations for 32 observed events using rotating wheel apparatus MANON and gas-jet transport system coupled to gas-filled recoil ion separator GARIS at RIKEN; deduced decay times, half-lives, decay branching ratios, production cross sections for ²⁶⁶Bh and ²⁶⁷Bh. Comparison with previous experimental results for half-lives and branching ratios for decay modes.

NUCLEAR REACTIONS ²⁴⁸Cm(²³Na, 5n), (²³Na, 4n), E=125.9, 130.6, 135.3 MeV; measured reaction products, σ(E) at RIKEN. Comparison with HIVAP calculations, and with previous experimental results.

doi: 10.1103/PhysRevC.102.024625
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2676. Data from this article have been entered in the XUNDL database. For more information, click here.

2019MA63      Nature(London) 573, 238 (2019)

T.Masuda, A.Yoshimi, A.Fujieda, H.Fujimoto, H.Haba, H.Hara, T.Hiraki, H.Kaino, Y.Kasamatsu, S.Kitao, K.Konashi, Y.Miyamoto, K.Okai, S.Okubo, N.Sasao, M.Seto, T.Schumm, Y.Shigekawa, K.Suzuki, S.Stellmer, K.Tamasaku, S.Uetake, M.Watanabe, T.Watanabe, Y.Yasuda, A.Yamaguchi, Y.Yoda, T.Yokokita, M.Yoshimura, K.Yoshimura

X-ray pumping of the ²²⁹Th nuclear clock isomer

RADIOACTIVITY ²²⁹Th(IT); measured decay products, Eγ, Iγ; deduced nuclear resonance scattering curves, active optical pumping into ^229mTh, resonance energy and T_1/2, branching ratios.

doi: 10.1038/s41586-019-1542-3
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Data from this article have been entered in the XUNDL database. For more information, click here.

2019SH38      Phys.Rev. C 100, 044304 (2019)

Y.Shigekawa, Y.Kasamatsu, E.Watanabe, H.Ninomiya, S.Hayami, N.Kondo, Y.Yasuda, H.Haba, A.Shinohara

Observation of internal-conversion electrons emitted from ^229mTh produced by β decay of ²²⁹Ac

RADIOACTIVITY ²²⁹Ac(β^-)[from ²³²Th(p, α), E=20 MeV, followed by chemical separation of ²²⁹Ac and preparation of an electrodeposited source at RCNP, Osaka University]; measured Eγ, ce, I(ce), β(ce)-coin, β(ce)(t). ^229mTh; deduced level, half-life of the 8.28-eV isomer.

doi: 10.1103/PhysRevC.100.044304
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Data from this article have been entered in the XUNDL database. For more information, click here.

2018SH23      Phys.Rev. C 98, 014306 (2018)

Y.Shigekawa, Y.Kasamatsu, Y.Yasuda, M.Kaneko, M.Watanabe, A.Shinohara

Variation of half-life and internal-conversion electron energy spectrum between ^235mU oxide and fluoride

RADIOACTIVITY ^235mU(IT)[from ²³⁹Pu α decay]; measured E(ce), I(ce), and T_1/2 of ^235mU by decay curves for internal conversion (IC) electrons using oxide and fluoride compounds of ^235mU and retarding-field electron analyzer; deduced shorter half-life for ^235mU fluoride as compared to that for ^235mU oxide, and clear difference in the IC electron energy spectra, analyzed through relativistic density functional theory (DFT) calculations of binding energies and molecular orbital states of both the compounds. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.98.014306
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Data from this article have been entered in the XUNDL database. For more information, click here.

2018ST11      Phys.Rev. C 98, 014317 (2018)

S.Stellmer, Y.Shigekawa, V.Rosecker, G.A.Kazakov, Y.Kasamatsu, Y.Yasuda, A.Shinohara, T.Schumm

Toward an energy measurement of the internal conversion electron in the deexcitation of the ²²⁹Th isomer

RADIOACTIVITY ^229mTh(IT)[from ²³³U(α)]; measured Eα, Iα, ce, (ce)α-coin using CANBERRA Passivated Implanted Planar Silicon (PIPS) detector. Numerical simulations by SRIM package for optimizing the stopping layer thickness. Discussed experimental method towards determining excitation energy of first excited isomeric state of ²²⁹Th. Relevance to applications of ^229mTh as a nuclear clock.

doi: 10.1103/PhysRevC.98.014317
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2018YO02      Phys.Rev. C 97, 024607 (2018)

A.Yoshimi, H.Hara, T.Hiraki, Y.Kasamatsu, S.Kitao, Y.Kobayashi, K.Konashi, R.Masuda, T.Masuda, Y.Miyamoto, K.Okai, S.Okubo, R.Ozaki, N.Sasao, O.Sato, M.Seto, T.Schumm, Y.Shigekawa, S.Stellmer, K.Suzuki, S.Uetake, M.Watanabe, A.Yamaguchi, Y.Yasuda, Y.Yoda, K.Yoshimura, M.Yoshimura

Nuclear resonant scattering experiment with fast time response: Photonuclear excitation of ²⁰¹Hg

NUCLEAR REACTIONS ²⁰¹Hg(γ, γ), E=high brilliance synchrotron radiation; measured decay signals, fluorescence energy spectrum, x-rays, half-life of 26.27-keV state of ²⁰¹Hg, nuclear resonant scattering (NRS) technique using BL09XU of SPring-8 of Japan Synchrotron Radiation Research Institute (JASRI). ²⁰¹Hg; deduced level, B(M1), σ(NRS).

doi: 10.1103/PhysRevC.97.024607
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Data from this article have been entered in the XUNDL database. For more information, click here.