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NSR database version of May 24, 2024.

Search: Author = Y.Kasamatsu

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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
Citations: PlumX Metrics


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
Citations: PlumX Metrics

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 T1/2, 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 T1/2 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.


2014HA04      Phys.Rev. C 89, 024618 (2014)

H.Haba, M.Huang, D.Kaji, J.Kanaya, Y.Kudou, K.Morimoto, K.Morita, M.Murakami, K.Ozeki, R.Sakai, T.Sumita, Y.Wakabayashi, A.Yoneda, Y.Kasamatsu, Y.Kikutani, Y.Komori, K.Nakamura, A.Shinohara, H.Kikunaga, H.Kudo, K.Nishio, A.Toyoshima, K.Tsukada

Production of 262Db in the 248Cm(19F, 5n)262Db reaction and decay properties of 262Db and 258Lr

NUCLEAR REACTIONS 248Cm(19F, 5n)262Db, E=97.4, 103.1 MeV; measured production σ of 262Db, correlated α-α and α-SF decay chains using rotating wheel apparatus MANON for α and SF spectrometry at RIKEN facility. Comparison with HIVAP model calculations, and with previous experimental and theoretical results. No observation of 263Db and 259Lr correlated chains through possible 248Cm(19F, 4n) reaction channel.

RADIOACTIVITY 262Db(α), (SF)[from 248Cm(19F, 5n), E=97.4, 103.1 MeV]; 258Lr(α), (EC)[from 262Db α decay]; measured Eα, Iα, half-lives, α-α, α-SF correlations, branching ratios for α, SF and EC modes. Comparison with previous experimental results.

doi: 10.1103/PhysRevC.89.024618
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2450. Data from this article have been entered in the XUNDL database. For more information, click here.


2014SE16      Nucl.Data Sheets 119, 197 (2014)

S.Sekimoto, H.Suzuki, H.Yashima, K.Ninomiya, Y.Kasamatsu, T.Shima, N.Takahashi, A.Shinohara, H.Matsumura, M.Hagiwara, K.Nishiizumi, M.W.Caffee, S.Shibata

Measurements of Cross Sections for Neutron-induced Reactions on Chromium and Yttrium Targets at 197 MeV

NUCLEAR REACTIONS Cr, Y(n, x), E=197 MeV; measured reaction products. 42,43K, 46,47Sc, 48Sc, 48V, 48,51Cr deduced σ. Compared with other data and JENDL-HE.

doi: 10.1016/j.nds.2014.08.055
Citations: PlumX Metrics


2013AS02      Phys.Rev. C 87, 014332 (2013)

M.Asai, K.Tsukada, M.Sakama, H.Haba, T.Ichikawa, Y.Ishii, A.Toyoshima, T.Ishii, I.Nishinaka, Y.Nagame, Y.Kasamatsu, M.Shibata, Y.Kojima, H.Hayashi

Ground-state configuration of the N=157 nucleus 259No

RADIOACTIVITY 259No(α)[from 248Cm(18O, 3nα), E=94 MeV]; measured Eα, Iα, Eγ, I(K-x rays), αγ-coin, T1/2 at JAEA facility. 255Fm; deduced levels, J, π, multipolarity, configuration. 259No; deduced ground-state configuration. 255,257,259,261,263,265No; calculated energies of neutron single-particle orbitals, and β2, β4, β6 deformation parameters using macroscopic-microscopic model based on FRLDM and Strutinsky shell correction method. Observed α lines from decays of 211,213,214Po, 211At, 250,254,255,256Fm, 253Es, 257No, 261Rf formed in competing reaction channels.

doi: 10.1103/PhysRevC.87.014332
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Data from this article have been entered in the XUNDL database. For more information, click here.


2013MU08      Phys.Rev. C 88, 024618 (2013)

M.Murakami, S.Goto, H.Murayama, T.Kojima, H.Kudo, D.Kaji, K.Morimoto, H.Haba, Y.Kudou, T.Sumita, R.Sakai, A.Yoneda, K.Morita, Y.Kasamatsu, H.Kikunaga, T.K.Sato

Excitation functions for production of Rf isotopes in the 248Cm + 18O reaction

NUCLEAR REACTIONS 248Cm(18O, xn)260Rf/261Rf/261mRf/262Rf, E=88.2, 90.2, 94.8, 101.3 MeV; measured reaction products, Eα, Iα, production σ(E), half-lives using GARIS separator at RIKEN Heavy-Ion Linear Accelerator facility. Beam on-off method. Comparison with previous experimental data, and with theoretical predictions using HIVAP computer code.

RADIOACTIVITY 260,261,261m,262Rf(α), (SF)[from 248Cm(18O, xn), E=88.2, 90.2, 94.8, 101.3 MeV]; 257No(α)[from 261Rf α decay]; measured Eα, Iα, α-α correlations, SF-events, half-lives; deduced excitation functions.

doi: 10.1103/PhysRevC.88.024618
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2438. Data from this article have been entered in the XUNDL database. For more information, click here.


2012HA05      Phys.Rev. C 85, 024611 (2012)

H.Haba, D.Kaji, Y.Kudou, K.Morimoto, K.Morita, K.Ozeki, R.Sakai, T.Sumita, A.Yoneda, Y.Kasamatsu, Y.Komori, A.Shinohara, H.Kikunaga, H.Kudo, K.Nishio, K.Ooe, N.Sato, K.Tsukada

Production of 265Sg in the 248Cm(22Ne, 5n)265Sg reaction and decay properties of two isomeric states in 265Sg

NUCLEAR REACTIONS 248Cm(22Ne, 5n)265Sg, E=228.8 MeV; measured evaporation residues, excitation function, production cross sections for isomers, αα, ααα and α(SF) correlations using RIKEN gas-filled recoil-ion separator GARIS. Comparison of cross sections with other 5n evaporation channel reactions, and HIVAP calculations.

RADIOACTIVITY 265,265mSg[from 248Cm(22Ne, 5n), E=228.8 MeV]; 261Rf, 261mRf(α), (SF)[from 265Sg α decay]; measured E(α), E(SF), I(α), T1/2, αα-coin, α(fragment) coin; deduced α and SF decay branching ratios from data for 79 α-α decay chains. 214Po, 252,253,254,255Fm, 257No(α); measured Eα.

doi: 10.1103/PhysRevC.85.024611
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2371.


2012MO25      J.Phys.Soc.Jpn. 81, 103201 (2012)

K.Morita, K.Morimoto, D.Kaji, H.Haba, K.Ozeki, Y.Kudou, T.Sumita, Y.Wakabayashi, A.Yoneda, K.Tanaka, S.Yamaki, R.Sakai, T.Akiyama, S.-i.Goto, H.Hasebe, M.Huang, T.Huang, E.Ideguchi, Y.Kasamatsu, K.Katori, Y.Kariya, H.Kikunaga, H.Koura, H.Kudo, A.Mashiko, K.Mayama, S.-ic.Mitsuoka, T.Moriya, M.Murakami, H.Murayama, S.Namai, A.Ozawa, N.Sato, K.Sueki, M.Takeyama, F.Tokanai, T.Yamaguchi, A.Yoshida

New Result in the Production and Decay of an Isotope, 278113, of the 113th Element

NUCLEAR REACTIONS 209Bi(70Zn, X)278Nh, E=349 MeV; measured reaction products, Eα, Iα. 274Rg, 270Mt, 266Bh, 262Db, 258Lr; deduced T1/2. Comparison with available data.

doi: 10.1143/JPSJ.81.103201
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2388.


2011HA13      Phys.Rev. C 83, 034602 (2011)

H.Haba, D.Kaji, H.Kikunaga, Y.Kudou, K.Morimoto, K.Morita, K.Ozeki, T.Sumita, A.Yoneda, Y.Kasamatsu, Y.Komori, K.Ooe, A.Shinohara

Production and decay properties of the 1.9-s isomeric state in 261Rf

RADIOACTIVITY 261Rf, 261mRf(α), (SF)[from 248Cm(18O, 5n), E=93.1, 95.1 MeV]; measured Eα, Iα, α-α correlations, SF-events, α and SF branching ratios, half-lives, σ of 261Rf g.s. and 261Rf isomer. 257No(α); measured Eα, half-life. 214Po, 254Fm, 255,259Rf; measured Eα.

NUCLEAR REACTIONS 248Cm(18O, 5n)261Rf, E=93.1, 95.1 MeV; measured σ, isomer σ ratio, half-lives.

doi: 10.1103/PhysRevC.83.034602
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2324. Data from this article have been entered in the XUNDL database. For more information, click here.


2011KI45      Radiochim.Acta Supp 1, Proc.in Radiochemistry 113 (2011)

H.Kikunaga, H.Fujisawa, K.Ooe, R.Takayama, A.Shinohara, K.Takamiya, Y.Kasamatsu, Y.Ezaki, H.Haba, T.Nakanishi, T.Mitsugashira, K.Hirose, T.Ohtsuki

Precision measurement of the half-life of 90mNb and 99mTc

RADIOACTIVITY 90Nb(EC), 99Tc(β-); measured decay products, Eγ, Iγ; deduced T1/2 and uncertainties.

doi: 10.1524/rcpr.2011.0020
Citations: PlumX Metrics


2009KI14      Phys.Rev. C 80, 034315 (2009)

H.Kikunaga, Y.Kasamatsu, H.Haba, T.Mitsugashira, M.Hara, K.Takamiya, T.Ohtsuki, A.Yokoyama, T.Nakanishi, A.Shinohara

Half-life estimation of the first excited state of 229Th by using α-particle spectrometry

RADIOACTIVITY 233U(α); measured Eα, Iα. 229mTh; deduced half-life.

doi: 10.1103/PhysRevC.80.034315
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Data from this article have been entered in the XUNDL database. For more information, click here.


2009MO12      J.Phys.Soc.Jpn. 78, 064201 (2009)

K.Morita, K.Morimoto, D.Kaji, H.Haba, K.Ozeki, Y.Kudou, N.Sato, T.Sumita, A.Yoneda, T.Ichikawa, Y.Fujimori, S.Goto, E.Ideguchi, Y.Kasamatsu, K.Katori, Y.Komori, H.Koura, H.Kudo, K.Ooe, A.Ozawa, F.Tokanai, K.Tsukada, T.Yamaguchi, A.Yoshida

Decay Properties of 266Bh and 262Db Produced in the 248Cm + 23Na Reaction

NUCLEAR REACTIONS 248Cm(23Na, 4n), (23Na, 5n), E=126, 130, 132 MeV; measured yields.

RADIOACTIVITY 266Bh(α); measured Eα, Iα.

doi: 10.1143/JPSJ.78.064201
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Data from this article have been entered in the EXFOR database. For more information, access X4 datasetE2176.


2008TO05      Radiochim.Acta 96, 323 (2008)

A.Toyoshima, Y.Kasamatsu, Y.Kitatsuji, K.Tsukada, H.Haba, A.Shinohara, Y.Nagame

Development of an electrochemistry apparatus for the heaviest elements

doi: 10.1524/ract.2008.1498
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2007NI06      J.Radioanal.Nucl.Chem. 272, 661 (2007)

K.Ninomiya, H.Sugiura, T.Nakatsuka, Y.Kasamatsu, H.Kikunaga, W.Sato, T.Yoshimura, H.Matsumura, K.Takamiya, M.K.Kubo, K.Sueki, A.Yokoyama, Y.Hamajima, T.Miura, K.Nishiyama, A.Shinohara

Study of electronic X-rays emitted from pionic and muonic atoms

ATOMIC PHYSICS Z=30-92; measured the energy shifts of electronic Kα X-rays for light muonic atoms.

doi: 10.1007/s10967-007-0642-y
Citations: PlumX Metrics


2007SA25      J.Radioanal.Nucl.Chem. 272, 665 (2007)

W.Sato, H.Ueno, A.Taniguchi, Y.Itsuki, Y.Kasamatsu, A.Shinohara, K.Asahi, Y.Ohkubo

Time-dependent quadrupole interactions for 140Ce ions implanted in highly oriented pyrolytic graphite

RADIOACTIVITY 140Ce(β-); measured Eγ, Iγ, angular anisotropy for source implanted in highly oriented pyrolytic graphite. Time-differential perturbed angular correlation.

doi: 10.1007/s10967-007-0643-x
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2005KA58      Radiochim.Acta 93, 511 (2005)

Y.Kasamatsu, H.Kikunaga, K.Takamiya, T.Mitsugashira, T.Nakanishi, Y.Ohkubo, T.Ohtsuki, W.Sato, A.Shinohara

Search for the decay of 229mTh by photon detection

RADIOACTIVITY 229mTh(IT) [from 233U(α)]; measured Eγ, Iγ; deduced T1/2 limits for isomer decay.

doi: 10.1524/ract.2005.93.9-10.511
Citations: PlumX Metrics


2005KI25      Radiochim.Acta 93, 507 (2005)

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

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

RADIOACTIVITY 229Th(α) [from 232Th(γ, 2np)]; measured Eα, Iα; deduced possible isomeric state decay.

doi: 10.1524/ract.2005.93.9-10.507
Citations: PlumX Metrics


2003MI02      J.Radioanal.Nucl.Chem. 255, 63 (2003)

T.Mitsugashira, M.Hara, T.Ohtsuki, H.Yuki, K.Takamiya, Y.Kasamatsu, A.Shinohara, H.Kikunaga, T.Nakanishi

Alpha-decay from the 3.5 eV isomer of 229Th

RADIOACTIVITY 229mTh(α) [from 230Th(γ, n)]; measured Eα, T1/2.

doi: 10.1023/A:1022267428310
Citations: PlumX Metrics


2003SA67      J.Nucl.Radiochem.Sci. 4, No 1, 15 (2003)

W.Sato, Y.Kasamatsu, Y.Ohkubo, A.Taniguchi, A.Shinohara

Time-Differential Perturbed Angular Correlation of 140Ce Implanted in Highly Oriented Pyrolytic Graphite


2003YO04      Czech.J.Phys. (Supplement) 53, A411 (2003)

A.Yokoyama, T.Murae, N.Kinoshita, H.Kikunaga, T.Ohki, M.Shigekawa, Y.Kasamatsu, A.Shinohara, S.Shibata, T.Saito

Radioisotope production in target fragmentation with high-energy heavy ions at HIMAC

NUCLEAR REACTIONS 197Au(12C, X), E=180, 290, 400 MeV/nucleon; 197Au(40Ar, X), E=290, 650 MeV/nucleon; measured fragment yields, isotopic production σ. Thick-target thick-catcher method.

doi: 10.1007/s10582-003-0053-4
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