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Search: Author = M.Oyaizu

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2023NI04      Phys.Rev.Lett. 130, 132502 (2023)

T.Niwase, Y.X.Watanabe, Y.Hirayama, M.Mukai, P.Schury, A.N.Andreyev, T.Hashimoto, S.Iimura, H.Ishiyama, Y.Ito, S.C.Jeong, D.Kaji, S.Kimura, H.Miyatake, K.Morimoto, J.-Y.Moon, M.Oyaizu, M.Rosenbusch, A.Taniguchi, M.Wada

Discovery of New Isotope 241U and Systematic High-Precision Atomic Mass Measurements of Neutron-Rich Pa-Pu Nuclei Produced via Multinucleon Transfer Reactions

NUCLEAR REACTIONS 198Pt(238U, X)235U/236U/237U/238U/239U/240U/241U/242U/235Pa/236Pa/237Pa/239Np/240Np/241Np/239Pu/240Pu/241Pu/242Pu, E=10.75 MeV/nucleon; measured reaction products, TOF. 241U; deduced new isotope production. The KEK Isotope Separation System (KISS) for the nuclear spectroscopy of nuclides produced via MNT reactions, installed at the RIKEN Nishina Center.

ATOMIC MASSES 235,236,237,238,239,240,241,242U, 235,236,237Pa, 239,240,241Np, 239,240,241,242Pu; measured frequencies (the first excitation step laser wavelength), TOF; deduced mass excesses. Comparison with AME2020 evaluation.

doi: 10.1103/PhysRevLett.130.132502
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2022HI07      Phys.Rev. C 106, 034326 (2022)

Y.Hirayama, M.Mukai, Y.X.Watanabe, P.Schury, H.Nakada, J.Y.Moon, T.Hashimoto, S.Iimura, S.C.Jeong, M.Rosenbusch, M.Oyaizu, T.Niwase, M.Tajima, A.Taniguchi, M.Wada, H.Miyatake

In-gas-cell laser resonance ionization spectroscopy of 200, 201Pt

NUCLEAR MOMENTS 198,200,201Pt; measured time-of-flight (TOF) spectra for ions with mass-to-charge-ratios, laser resonance ionization spectra using Multireflection time-of-flight mass spectrograph (MRTOF-MS) at KEK Isotope Separation System (KISS) of RIKEN facility. 200,201Pt; deduced differential mean-square charge radii and isotope shifts relative to those of 198Pt, magnetic dipole and electric quadrupole moments of 201Pt, β2 deformation parameters Comparison with theoretical calculations using symmetry-conserving configuration-mixing (SCCM) with Gogny D1S energy density functionals (SCCM+Gogny D1S), finite-range droplet model (FRDM), and constrained-Hartree-Fock-Bogoliubov (CHFB) theory with five-dimensional collective Hamiltonian (5DCH) based on the Gogny D1 interaction. 201Pt; deduced most likely spin-parity of 5/2-. 198,200,201Pt produced in 198Pt(136Xe, X), E=10.75 MeV/nucleon multi-nucleon transfer reactions.

doi: 10.1103/PhysRevC.106.034326
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2022MU10      Phys.Rev. C 105, 034331 (2022)

M.Mukai, Y.Hirayama, Y.X.Watanabe, H.Watanabe, H.Koura, S.C.Jeong, H.Miyatake, M.Brunet, S.Ishizawa, F.G.Kondev, G.J.Lane, Yu.A.Litvinov, T.Niwase, M.Oyaizu, Zs.Podolyak, M.Rosenbusch, P.Schury, M.Wada, P.M.Walker

Ground-state β-decay spectroscopy of 187Ta

RADIOACTIVITY 187Ta(β-)[from W(136Xe, X), E=7.2 MeV/nucleon]; measured Eγ, Iγ, βγ-coin; deduced Iβ feedings, T1/2, logft, Iγ/β-decay. 187W; deduced Eγ, multipolarities, total conversion coefficients (BrIcc calculations). Comparison to KTUY+gross theory, FRDM+QRPA and RHB+pn-RQRPAKEK calculations. Isotope Separation System (KISS) at RIKEN, an argon-gas-cell-based laser ion source combined with an on-line isotope separator.

doi: 10.1103/PhysRevC.105.034331
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2021AH02      Phys.Rev. C 103, 054312 (2021)

M.Ahmed, Y.X.Watanabe, Y.Hirayama, M.Mukai, J.H.Park, P.Schury, Y.Kakiguchi, A.Ozawa, M.Oyaizu, M.Wada, H.Miyatake

β-γ spectroscopy of the 195Os nucleus

RADIOACTIVITY 195Os(β-)[ionized 195Os using laser system from 198Pt(136Xe, X), E=9.4 MeV/nucleon at the KEK isotope separation system (KISS) at RIKEN RIBF facility]; measured Eβ, Iβ, Eγ, Iγ, x rays, βγ- and γγ-coin, half-life of 195Os decay using a multisegmented proportional gas counter (MSPGC) for β radiation, and four clover HPGe detectors for γ rays. 195Ir; deduced levels, J, π, Iβ feedings, logft. 195Os; deduced spin and parity of the ground state. Systematics of half-lives of 195,196,197,198,199,200,201,202,203,204,205,206Os, and comparison with theoretical predictions.

doi: 10.1103/PhysRevC.103.054312
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2021WA39      Phys.Rev. C 104, 024330 (2021)

Y.X.Watanabe, P.M.Walker, Y.Hirayama, M.Mukai, H.Watanabe, G.J.Lane, M.Ahmed, M.Brunet, T.Hashimoto, S.Ishizawa, S.Kimura, F.G.Kondev, Yu.A.Litvinov, H.Miyatake, J.Y.Moon, T.Niwase, M.Oyaizu, J.H.Park, Zs.Podolyak, M.Rosenbusch, P.Schury, M.Wada

First direct observation of isomeric decay in neutron-rich odd-odd 186Ta

RADIOACTIVITY 186Ta(β-), 186mTa(IT)[from W(136Xe, X), E=7.2 MeV/nucleon, followed by laser ionization and mass separation at the KEK Isotope Separation System (KISS) of RIBF-RIKEN facility]; measured Eγ, Iγ, (particle)γ-coin, half-lives of decays of 186Ta and neutral 186mTa from γ-decay curves. 186Ta; deduced levels, J, π, E3 multipolarity of the 161-keV isomeric transition from a comparison of measured half-life of the neutral isomer with previous measurements of the ionized isomeric state of 186Ta using the Experimental Storage Ring at GSI Darmstadt, no evidence found for the β decay mode of the 186Ta isomer.

doi: 10.1103/PhysRevC.104.024330
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2020CH33      Phys.Rev. C 102, 034309 (2020)

H.Choi, Y.Hirayama, S.Choi, T.Hashimoto, S.C.Jeong, H.Miyatake, J.Y.Moon, M.Mukai, T.Niwase, M.Oyaizu, M.Rosenbusch, P.Schury, A.Taniguchi, Y.X.Watanabe, M.Wada

In-gas-cell laser ionization spectroscopy of 194, 196Os isotopes by using a multireflection time-of-flight mass spectrograph

NUCLEAR MOMENTS 194,196Os; measured laser resonance spectra, time-of-flight spectra using the in-gas-cell laser ionization method and multireflection time-of-flight mass spectrograph (MRTOF-MS); deduced isotope shifts, change in mean-square charge radii and quadrupole deformation parameters. 194,196Os produced in 198Pt(136Xe, X), E=10.75 MeV/nucleon reaction at the KEK Isotope Separation System (KISS). 188,189,190,192,194,196Os; systematics of the change in mean-square charge radii and quadrupole deformation parameters, and their comparison with theoretical calculations.

doi: 10.1103/PhysRevC.102.034309
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2020HI01      Nucl.Instrum.Methods Phys.Res. B463, 425 (2020)

Y.Hirayama, Y.X.Watanabe, M.Mukai, P.Schury, M.Ahmed, H.Ishiyama, S.C.Jeong, Y.Kakiguchi, S.Kimura, J.Y.Moon, M.Oyaizu, J.H.Park, M.Wada, H.Miyatake

Nuclear spectroscopy of r-process nuclei using KEK Isotope Separation System

NUCLEAR REACTIONS 198Pt(136Xe, X)196Os/197Os/198Os/198Pt/199Pt, E=10.75 MeV/nucleon; measured reaction products, Eβ, Iβ, Eγ, Iγ; deduced T1/2 for osmium, HFS spectra for platinum.

doi: 10.1016/j.nimb.2019.04.035
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2020MU16      Phys.Rev. C 102, 054307 (2020)

M.Mukai, Y.Hirayama, Y.X.Watanabe, S.Schiffmann, J.Ekman, M.Godefroid, P.Schury, Y.Kakiguchi, M.Oyaizu, M.Wada, S.C.Jeong, J.Y.Moon, J.H.Park, H.Ishiyama, S.Kimura, H.Ueno, M.Ahmed, A.Ozawa, H.Watanabe, S.Kanaya, H.Miyatake

In-gas-cell laser resonance ionization spectroscopy of 196, 197, 198Ir

NUCLEAR MOMENTS 196,197,198Ir; measured hyperfine structure (HFS) spectra using in-gas-cell laser resonance ionization spectroscopy at the KEK Isotope Separation System at RIBF-RIKEN facility; deduced spins for the ground states, magnetic dipole moments, mean-square charge radii, isotope shifts, β2 deformation parameters. Comparison with theoretical calculations based on the strong coupling model. Comparison with previous experimental results. Systematics of quadrupole moments, magnetic dipole moments, mean-square charge radii and β2 deformation parameters for 189,191,193,196,197,198Ir.

NUCLEAR REACTIONS 198Pt(136Xe, X)196Ir/197Ir/198Ir, E=10.75 MeV/nucleon; measured extraction yields, Eβ, half-lives of the decays of 196Ir, 197Ir and 198Ir. The Ir isotopes produced in multi-nucleon transfer reaction. Comparison with previous experimental half-lives.

doi: 10.1103/PhysRevC.102.054307
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2020WA12      Phys.Rev. C 101, 041305 (2020), Erratum Phys.Rev. C 103, 019902 (2021)

Y.X.Watanabe, M.Ahmed, Y.Hirayama, M.Mukai, J.H.Park, P.Schury, Y.Kakiguchi, S.Kimura, A.Ozawa, M.Oyaizu, M.Wada, H.Miyatake

Deexcitation γ-ray transitions from the long-lived Iπ = 13/2+ metastable state in 195Os

RADIOACTIVITY 195mOs(IT)[from 198Pt(136Xe, X), E=9.4 MeV/nucleon, followed by separation of fragments using KEK Isotope Separation System (KISS) at RIBF-RIKEN facility, and laser excitation of 195Os isomer]; measured Eγ, Iγ, ce, γγ- and (ce)γ-coin, neutral atom T1/2 of the 47-s, (13/2+) isomer from x-ray and γ-ray decay curves using multi-segmented proportional gas counter (MSPGC) for β, x-rays and conversion electrons, and four HPGe clover detectors for γ radiation. 195Os; deduced levels, J, π; discussed multipolarity of the low-energy γ transition from the isomer. Comparison with previous measurement of the 195mOs isomer and half-life of the fully-stripped isomer using the ESR at GSI. Comparison with experimental results for level schemes from the decays of the 13/2+ isomers in 197Pt and 199Hg.

doi: 10.1103/PhysRevC.101.041305
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2018HI07      Phys.Rev. C 98, 014321 (2018), Erratum Phys.Rev. C 106, 069902 (2022)

Y.Hirayama, Y.X.Watanabe, M.Mukai, M.Ahmed, S.C.Jeong, Y.Kakiguchi, S.Kimura, M.Oyaizu, J.H.Park, P.Schury, M.Wada, H.Watanabe, H.Miyatake

β- and γ-decay spectroscopy of 197, 198Os

RADIOACTIVITY 196,197,198Os, 198Ir(β-)[from 198Pt(136Xe, X), E=10.75 MeV/nucleon using KEK Isotope Separation System (KISS) at RIKEN, an argon-gas-cell-based laser ion source combined with an on-line isotope separator]; measured β- radiation using multisegmented proportional gas counter (MSPGC), Eγ, Iγ, γγ- and βγ-coin with particle selection condition of Os and Ir, half-lives of decays of 196,197,198Os and 198Ir. 197,198Ir, 198Pt; deduced levels, Iβ feedings, logft, configurations of parent and daughter states. 197mTl(IT); measured Eγ, Iγ, T1/2; deduced conversion coefficients and compared with previous results. Comparison with previous experimental data. A=195-206, Z=76; comparison of measured β-decay half-lives with theoretical results from DF3, FRDM, and KUTY models.

doi: 10.1103/PhysRevC.98.014321
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2018MU19      Nucl.Instrum.Methods Phys.Res. A884, 1 (2018)

M.Mukai, Y.Hirayama, Y.X.Watanabe, P.Schury, H.S.Jung, M.Ahmed, H.Haba, H.Ishiyama, S.C.Jeong, Y.Kakiguchi, S.Kimura, J.Y.Moon, M.Oyaizu, A.Ozawa, J.H.Park, H.Ueno, M.Wada, H.Miyatake

High-efficiency and low-background multi-segmented proportional gas counter for β-decay spectroscopy

RADIOACTIVITY 198Ir(β-), 199Pt(IT), (β-) [from 198Pt(136Xe, X), E=9.6 MeV/nucleon]; measured decay products, Eγ, Iγ, Eβ, Iβ, β-γ-coin.; deduced T1/2 and uncertainties. Comparison with available data.

doi: 10.1016/j.nima.2017.12.013
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2017HI05      Phys.Rev. C 96, 014307 (2017)

Y.Hirayama, M.Mukai, Y.X.Watanabe, M.Ahmed, S.C.Jeong, H.S.Jung, Y.Kakiguchi, S.Kanaya, S.Kimura, J.Y.Moon, T.Nakatsukasa, M.Oyaizu, J.H.Park, P.Schury, A.Taniguchi, M.Wada, K.Washiyama, H.Watanabe, H.Miyatake

In-gas-cell laser spectroscopy of the magnetic dipole moment of the N ≈ 126 isotope 199Pt

NUCLEAR MOMENTS 199Pt, 199mPt; measured magnetic dipole and electric quadrupole moments, isotope shifts, mean-square charge radii by hyperfine splitting of the 48.792-nm transition using the in-gas-cell laser ionization spectroscopy (IGLIS), and the half-lives of the ground state and the isomer; discussed configurations. 192,196,198Pt; measured mean-square charge radii relative to that of 194Pt by hyperfine structure. Pt isotopes produced in 198Pt(136Xe, X), E=10.75 MeV/nucleon reaction using the on-line KEK Isotope Separation System (KISS) at RIKEN. Comparison with previous experimental results, and with self-consistent Bogoliubov (HFB) model calculations. Systematics of magnetic dipole moments of 5/2- and 13/2+ states in 193,195,197,199Pt and 197,199Hg. Systematics of mean square charge radius and quadrupole deformation in A=178-199 Pt isotopes.

doi: 10.1103/PhysRevC.96.014307
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2016HI09      Nuovo Cim. C 39, 359 (2016)

Y.Hirayama, Y.X.Watanabe, H.Miyatake, P.Schury, M.Wada, M.Oyaizu, Y.Kakiguchi, M.Mukai, S.Kimura, M.Ahmed, S.C.Jeong, J.Y.Moon, J.H.Park

Nuclear spectroscopy of r-process nuclei around N=126 using KISS

RADIOACTIVITY 199Pt, 196Ir(β-); measured decay products; deduced T1/2 and their uncertainties. Laser resonance ionization technique in the gas cell.

doi: 10.1393/ncc/i2016-16359-9
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2004JE13      Nucl.Phys. A746, 293c (2004)

S.C.Jeong, I.Katayama, H.Kawakami, H.Ishiyama, Y.Watanabe, H.Miyatake, E.Tojyo, M.Oyaizu, K.Enomoto, M.Sataka, S.Okayasu, H.Sugai, S.Ichikawa, K.Nishio, Y.Sugiyama, A.Iwase, M.Yahagi, T.Hashimoto, K.Takada, M.Watanabe, M.Tanigaki, T.Shinozuka

8Li and 18F diffusion experiments in solids - an application of accelerated RNB -

doi: 10.1016/j.nuclphysa.2004.09.026
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2002JE08      Nucl.Phys. A701, 461c (2002)

S.C.Jeong, H.Ishiyama, H.Kawakami, H.Miyatake, Y.Ishida, E.Tojyo, M.Oyaizu, S.Mizutani, N.Yoshikawa, M.H.Tanaka, H.Kawashima, Y.Fuchi, M.Wada, I.Katayama, T.Nomura

Target-Ion-Source System for RNB Facility at KEK Tanashi

doi: 10.1016/S0375-9474(01)01627-X
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2002MI25      Nucl.Phys. A701, 62c (2002)

H.Miyatake, S.C.Jeong, H.Ishiyama, Y.Ishida, H.Kawakami, N.Yoshikawa, I.Katayama, M.H.Tanaka, E.Tojyo, M.Oyaizu, S.Arai, S.Tomizawa, K.Niki, Y.Arakaki, M.Okada, Y.Takeda, M.Wada, P.Strasser, S.Kubono, T.Nomura

Present Status of the Radioactive Nuclear Beam Facility at KEK-Tanashi and the E-Arena in the KEK-JAERI Joint Project

doi: 10.1016/S0375-9474(01)01549-4
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1997KU05      Nucl.Phys. A616, 11c (1997)

S.Kubono, T.Nomura, S.Arai, Y.Arakaki, Y.Hashimoto, A.Imanishi, S.C.Jeong, I.Katayama, T.Katayama, H.Kawakami, H.Masuda, T.Miyachi, K.Niki, M.Okada, M.Oyaizu, Y.Shirakabe, P.Strasser, Y.Takeda, J.Tanaka, M.H.Tanaka, E.Tojyo, N.Tokuda, M.Tomizawa, M.Wada, K.Yoshida, M.Yoshizawa, M.Fujioka, S.Kato, T.Shinozuka, H.Wollnik

New ISOL-Based Radioactive Nuclear Beam Facility at INS

doi: 10.1016/S0375-9474(97)00069-9
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1989MI17      Nucl.Phys. A501, 557 (1989)

H.Miyatake, T.Nomura, S.Kubono, J.Tanaka, M.Oyaizu, H.Okawa, N.Ikeda, K.Sueki, H.Kudo, K.Morita, T.Shinozuka

Alpha Decays of 221Pa and 218,219Ac

NUCLEAR REACTIONS 209Bi(16O, xn), (16O, xnα), E=87-102 MeV; measured α decay yields, Eα from residues. Gas-filled recoil separator.

RADIOACTIVITY 221Pa, 218,219Ac [from 205Tl, 209Bi(16O, xnα), E=87-102 MeV]; measured Eα, α-decay yields. 221Pa, 218,219Ac deduced T1/2, Qα. Gas-filled recoil separator.

doi: 10.1016/0375-9474(89)90148-6
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