NSR Query Results

Output year order : Descending
Format : Normal

NSR database version of April 26, 2024.

Search: Author = S.Ishizawa

Found 7 matches.

Back to query form

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, T_1/2, 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
Citations: PlumX Metrics
Data from this article have been entered in the XUNDL database. For more information, click here.

2021NI08      Phys.Rev. C 104, 044617 (2021)

T.Niwase, M.Wada, P.Schury, P.Brionnet, S.D.Chen, T.Hashimoto, H.Haba, Y.Hirayama, D.S.Hou, S.Iimura, H.Ishiyama, S.Ishizawa, Y.Ito, D.Kaji, S.Kimura, J.Liu, H.Miyatake, J.Y.Moon, K.Morimoto, K.Morita, D.Nagae, M.Rosenbusch, A.Takamine, T.Tanaka, Y.X.Watanabe, H.Wollnik, W.Xian, S.X.Yan

α-decay-correlated mass measurement of ^{206, 207g, m}Ra using an α-TOF detector equipped multireflection time-of-flight mass spectrograph system

ATOMIC MASSES ^206,207,207mRa; measured time-of-flight spectra by α-decay-correlated mass spectroscopy using multireflection time-of-flight mass spectrograph (MRTOF-MS) system, with an α-TOF detector at SHE-Mass-II facility of RIBF-RIKEN; deduced mass excesses, and compared with evaluated data in AME2020. ^207mRa; deduced excitation energy of the isomer, J, π. ^206,207,207mRa isotopes produced in ¹⁵⁹Tb(⁵¹V, X), E=306 MeV, followed by separation of evaporation residues using recoil ion separator GARIS-II at RIKEN.

RADIOACTIVITY ^206,207mRa(α)[from ¹⁵⁹Tb(⁵¹V, X), E=306 MeV at RIBF-RIKEN]; measured Eα, Iα, T_1/2 of decays of ²⁰⁶Ra and ^207mRa, excitation energy of the isomer; deduced α-reduced width, configuration. Systematics of spins, parities, Eα, T_1/2, α-branching ratios, reduced α widths for ^{203,203m,205,205m,207,207m}Ra. ^198,199Po, ^202,203At, ^202,203Rn, ^206,207Fr, ²⁰⁷Ra; observed α spectra from decays.

doi: 10.1103/PhysRevC.104.044617
Citations: PlumX Metrics
Data from this article have been entered in the XUNDL database. For more information, click here.

2021SC14      Phys.Rev. C 104, L021304 (2021)

P.Schury, T.Niwase, M.Wada, P.Brionnet, S.Chen, T.Hashimoto, H.Haba, Y.Hirayama, D.S.Hou, S.Iimura, H.Ishiyama, S.Ishizawa, Y.Ito, D.Kaji, S.Kimura, H.Koura, J.J.Liu, H.Miyatake, J.-Y.Moon, K.Morimoto, K.Morita, D.Nagae, M.Rosenbusch, A.Takamine, Y.X.Watanabe, H.Wollnik, W.Xian, S.X.Yan

First high-precision direct determination of the atomic mass of a superheavy nuclide

ATOMIC MASSES ²⁵⁷Db; measured Eα, time-of flight, distribution of time-of-flight (ToF)-correlated α-decay events using multireflection time-of-flight mass spectrograph (MRTOF-MS) at RIKEN Ring Cyclotron facility; deduced A/q and mass excess for each of the 11 observed correlated events assigned to ²⁵⁷Db. Comparison with AME2016 evaluated data. ²⁵⁷Db isotope produced in ²⁰⁸Pb(⁵¹V, 2n), E=306 MeV reaction, followed by separation of fragments using GARIS-II separator.

doi: 10.1103/PhysRevC.104.L021304
Citations: PlumX Metrics

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
Citations: PlumX Metrics
Data from this article have been entered in the XUNDL database. For more information, click here.

2020TA02      Phys.Rev.Lett. 124, 052502 (2020)

T.Tanaka, K.Morita, K.Morimoto, D.Kaji, H.Haba, R.A.Boll, N.T.Brewer, S.Van Cleve, D.J.Dean, S.Ishizawa, Y.Ito, Y.Komori, K.Nishio, T.Niwase, B.C.Rasco, J.B.Roberto, K.P.Rykaczewski, H.Sakai, D.W.Stracener, K.Hagino

Study of Quasielastic Barrier Distributions as a Step towards the Synthesis of Superheavy Elements with Hot Fusion Reactions

NUCLEAR REACTIONS ²⁴⁸Cm(²²Ne, X), (²⁶Mg, X), ²³⁸U(⁴⁸Ca, X), E(cm)=165.1, 203.7 MeV; measured reaction products; deduced σ. Comparison with available data.

doi: 10.1103/PhysRevLett.124.052502
Citations: PlumX Metrics

2020WA29      Phys.Rev.Lett. 125, 192505 (2020)

P.M.Walker, Y.Hirayama, G.J.Lane, H.Watanabe, G.D.Dracoulis, M.Ahmed, M.Brunet, T.Hashimoto, S.Ishizawa, F.G.Kondev, Y.A.Litvinov, H.Miyatake, J.Y.Moon, M.Mukai, T.Niwase, J.H.Park, Z.Podolyak, M.Rosenbusch, P.Schury, M.Wada, X.Y.Watanabe, W.Y.Liang, F.R.Xu

Properties of ¹⁸⁷Ta Revealed through Isomeric Decay

RADIOACTIVITY ¹⁸⁷Ta(IT) [from W(¹³⁶Xe, X), E=7.2 MeV/nucleon]; measured decay products, Eγ, Iγ, Eβ, Iβ, γ-γ-, β-γ-coin.; deduced level energies, J, π, T_1/2. Comparison with theoretical calculations.

doi: 10.1103/PhysRevLett.125.192505
Citations: PlumX Metrics
Data from this article have been entered in the XUNDL database. For more information, click here.

2018IT04      Phys.Rev.Lett. 120, 152501 (2018)

Y.Ito, P.Schury, M.Wada, F.Arai, H.Haba, Y.Hirayama, S.Ishizawa, D.Kaji, S.Kimura, H.Koura, M.MacCormick, H.Miyatake, J.Y.Moon, K.Morimoto, K.Morita, M.Mukai, I.Murray, T.Niwase, K.Okada, A.Ozawa, M.Rosenbusch, A.Takamine, T.Tanaka, Y.X.Watanabe, H.Wollnik, S.Yamaki

First Direct Mass Measurements of Nuclides around Z=100 with a Multireflection Time-of-Flight Mass Spectrograph

NUCLEAR REACTIONS ²³²Th(¹⁹F, 5n)²⁴⁶Es, E=99.6, 103 MeV;²³⁸U(¹⁸O, 5n)²⁵¹Fm, E=93.9 MeV; ²⁰³Tl(⁴⁸Ca, 2n)²⁴⁹Md, E=215 MeV; ²⁰⁵Tl(⁴⁸Ca, 3n)²⁵⁰Md, E=223 MeV; ²⁰⁵Tl(⁴⁸Ca, 2n)²⁵¹Md, E=215 MeV; ²³⁸U(¹⁹F, 5n)²⁵²md, E=98.6 MeV; ²⁰⁸Pb(⁴⁸Ca, 2n)²⁵⁴No, E=219 MeV; measured reaction products, TOF; deduced mass excesses. Comparison with available data.

ATOMIC MASSES ^253,254Lr, ^257,258Db, ^261,262Bh, ²⁶⁶Mt; analyzed available data; deduced mass excesses.

doi: 10.1103/PhysRevLett.120.152501
Citations: PlumX Metrics