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8 results on '"Toshiyuki Kubo"'

1. K-mixing in the doubly mid-shell nuclide 170Dy and the role of vibrational degeneracy

Author

P. A. Söderström, C. J. Griffin, Philip M Walker, Shunji Nishimura, Ayumi Yagi, István Kuti, Zhengyu Xu, A. Estrade, Gavin Lotay, N. Kurz, P. Lee, S. Lalkovski, S. Terashima, V. H. Phong, P. Doornenbal, F. Browne, Naoki Fukuda, Raymond J. Carroll, Thamer Alharbi, H. L. Liu, Zs. Vajta, Oliver J. Roberts, Zs. Podolyák, C. S. Lee, C. M. Shand, Hidetada Baba, D.S. Ahn, Zs. Dombrádi, Alison Bruce, Shigeru Kubono, K. Y. Chae, S. Kanaya, Furong Xu, J. J. Liu, H. Kanaoka, Zena Patel, C. R. Niţă, I. Nishizuka, Atsuko Odahara, Toshiyuki Sumikama, Hiroyuki Takeda, G. J. Lane, Toshiyuki Kubo, Hiroyoshi Sakurai, E. J. Lee, P. H. Regan, G. X. Zhang, H. Schaffner, Eiji Ideguchi, Naohito Inabe, Hirofumi Watanabe, Tadaaki Isobe, Chang-Bum Moon, Z. Korkulu, Hiroshi Suzuki, I. Kojouharov, J. J. Valiente-Dobón, Jin Wu, G. Lorusso, and F. G. Kondev

Subjects
Mid-shell, Nuclear and High Energy Physics, Shell (structure), chemistry.chemical_element, 01 natural sciences, K isomer, 0103 physical sciences, medicine, Physics::Atomic and Molecular Clusters, Dysprosium, Gamma spectroscopy, ddc:530, Nuclide, 010306 general physics, γ-Ray spectroscopy, Physics, 010308 nuclear & particles physics, Yrast, lcsh:QC1-999, medicine.anatomical_structure, chemistry, Atomic physics, Nucleus, Order of magnitude, Excitation, lcsh:Physics
Abstract

Physics letters / B 762, 404 - 408 (2016). doi:10.1016/j.physletb.2016.09.058, Published by North-Holland Publ., Amsterdam

Published
2016
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2. Decay spectroscopy of 160 Sm: The lightest four-quasiparticle K isomer

Author

Hiroyoshi Sakurai, P. H. Regan, István Kuti, M. Tanaka, Shunji Nishimura, H. Suzuki, Naohiro Inabe, Hiroki Nishibata, Tetsuro Komatsubara, T. Isobe, Toshiyuki Kubo, Rin Yokoyama, Shin'ichiro Michimasa, K. Kobayashi, Toshiyuki Sumikama, Zs. Dombrádi, N. Kurz, D. Kameda, E. Sahin, Ayumi Yagi, Zhengyu Xu, Atsuko Odahara, I. Kojouharov, R. Daido, Z. H. Li, Eiji Ideguchi, F. Browne, Stephen Rice, G. Benzoni, Zs. Podolyák, Jan Taprogge, Hiroyuki Takeda, H. Schaffner, P. Doornenbal, Guillaume Gey, H. L. Liu, Michikazu Kobayashi, Chang-Bum Moon, Hirofumi Watanabe, A. Gottardo, Nori Aoi, Zs. Vajta, Gary Simpson, F. L. Bello Garrote, I. Nishizuka, Shintaro Go, Zena Patel, P. M. Walker, N. Fukuda, L. Sinclair, P. A. Söderström, H. Baba, Y. F. Fang, Furong Xu, Masafumi Matsushita, Jin Wu, G. Lorusso, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fizikai tudományok, State (functional analysis), 7. Clean energy, 01 natural sciences, lcsh:QC1-999, Természettudományok, 0103 physical sciences, Potential energy surface, Quasiparticle, ddc:530, Atomic physics, 010306 general physics, Ground state, Electronic band structure, Spectroscopy, ComputingMilieux_MISCELLANEOUS, lcsh:Physics, Excitation
Abstract

The decay of a new four-quasiparticle isomeric state in 160Sm has been observed using γ-ray spectroscopy at the RIBF, RIKEN. The four-quasiparticle state is assigned a 2 π ⊗ 2 ν π 5 2 − [ 532 ] , π 5 2 + [ 413 ] , ν 5 2 − [ 523 ] , ν 7 2 + [ 633 ] configuration. The half-life of this ( 11 + ) state is measured to be 1.8(4) μs. The ( 11 + ) isomer decays into a rotational band structure, based on a ( 6 − ) ν 5 2 − [ 523 ] ⊗ ν 7 2 + [ 633 ] bandhead, consistent with the g K − g R values. This decays to a ( 5 − ) two-proton quasiparticle state, which in turn decays to the ground state band. Potential energy surface and blocked-BCS calculations were performed in the deformed midshell region around 160Sm. They reveal a significant influence from β 6 deformation and that 160Sm is the best candidate for the lightest four-quasiparticle K isomer to exist in this region. The relationship between reduced hindrance and isomer excitation energy for E1 transitions from multiquasiparticle states is considered with the new data from 160Sm. The E1 data are found to agree with the existing relationship for E2 transitions.

Published
2016
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3. Identification of a millisecond isomeric state inCd81129via the detection of internal conversion and Compton electrons

Author

Naohiro Inabe, G. D. Kim, N. Fukuda, E. Nacher, M. Niikura, T. Isobe, Pieter Doornenbal, Giuseppe Lorusso, F.G. Kondev, D. Mücher, K. Yoshinaga, Atsuko Odahara, Y.-K. Kim, R. Orlandi, Guillaume Gey, Hiroshi Watanabe, Z. H. Li, D. Kameda, A. Gargano, Jin Wu, K. Moschner, Toshiyuki Sumikama, H. Baba, Zhengyu Xu, H. Schaffner, Hiroyuki Takeda, Jan Taprogge, G. S. Simpson, Toshiyuki Kubo, Ayumi Yagi, A. Covello, S. Ilieva, N. Kurz, A. Wendt, F. Drouet, Hyo Soon Jung, K. Steiger, L. Coraggio, H. Grawe, A. Jungclaus, Roman Gernhäuser, Z Vajta, P. A. Söderström, T. Kröll, A. Gadea, Hiroki Nishibata, I. Kojouharov, S. Nishimura, Frank Browne, G. Benzoni, Younghun Kwon, J.-M. Daugas, Z. Patel, S. Bönig, H. Sakurai, G. J. Lane, Zs. Podolyák, A. Montaner-Pizá, H. Suzuki, F. Naqvi, and K. Y. Chae

Subjects
Physics, Nuclear and High Energy Physics, Millisecond, Fission, Nuclear Theory, Electron, Nuclear isomer, 7. Clean energy, Internal conversion, Excited state, Atomic physics, Nuclear Experiment, Spin (physics), Beam (structure)
Abstract

The decay of an isomeric state in the neutron-rich nucleus 129 Cd has been observed via the detection of internal conversion and Compton electrons providing first experimental information on excited states in this nucleus. The isomer was populated in the projectile fission of a 238 U beam at the Radioactive Isotope Beam Factory at RIKEN. From the measured yields of γ -rays and internal conversion electrons, a multipolarity of E 3 was tentatively assigned to the isomeric transition. A half-life of T 1 / 2 = 3.6 ( 2 ) ms was determined for the new state which was assigned a spin of ( 21 / 2 + ) , based on a comparison to shell model calculations performed using state-of-the-art realistic effective interactions.

Published
2014
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4. Interplay of quasiparticle and vibrational excitations: First observation of isomeric states in 168Dy and 169Dy

Author

JJ Liu, P. Lee, Shigeru Kubono, T. Lauritsen, Eunji Lee, J. J. Valiente-Dobón, S. Kanaya, Alison Bruce, H. Baba, S. Zhu, Shunji Nishimura, G. X. Zhang, Thamer Alharbi, Z. Korkulu, Zhengyu Xu, C.J. Chiara, D. Seweryniak, V. H. Phong, Gavin Lotay, C. J. Lister, C. M. Shand, Toshiyuki Kubo, Hirofumi Watanabe, Jin Wu, Y. Shimizu, Kenichi Yoshida, Zs. Vajta, C. S. Lee, I. Nishizuka, C. R. Nita, Atsuko Odahara, Chang-Bum Moon, H. Schaffner, M. P. Carpenter, F. Browne, G. J. Lane, Giuseppe Lorusso, P. M. Walker, Hiroshi Suzuki, I. Kojouharov, P. A. Söderström, D.S. Ahn, Hiroyoshi Sakurai, Eiji Ideguchi, Naohito Inabe, A. Estrade, K. Y. Chae, G.D. Dracoulis, István Kuti, Satoru Terashima, P. H. Regan, S. Lalkovski, Toshiyuki Sumikama, Hiroyuki Takeda, N. Kurz, P. Doornenbal, Zena Patel, Naoki Fukuda, Raymond J. Carroll, Zs. Podolyák, Zs. Dombradi, T. Isobe, Ayumi Yagi, C. J. Griffin, E. A. McCutchan, Oliver J. Roberts, H. Kanaoka, and F. G. Kondev

Subjects
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Fission, 01 natural sciences, lcsh:QC1-999, Isotope separation, law.invention, Nuclear physics, law, 0103 physical sciences, Quasiparticle, Gammasphere, Neutron, 010306 general physics, Ground state, lcsh:Physics, Excitation
Abstract

The neutron-rich dysprosium isotopes ¹⁶⁸Dy₁₀₂ and ¹⁶⁹Dy₁₀₃ have been investigated using the EURICA γ-ray spectrometer, following production via in-flight fission of a high-intensity uranium beam in conjunction with isotope separation through the BigRIPS separator at RIBF in RIKEN Nishina Center. For ¹⁶⁸Dy, a previously unreported isomer with a half-life of 0.57(7) μs has been identified at an excitation energy of 1378 keV, and its presence affirmed independently using γ-γ-γ coincidence data taken with Gammasphere via two-proton transfer from an enriched ¹⁷⁰Er target performed at Argonne National Laboratory. This isomer is assigned Jπ = Kπ = (4⁻) based on the measured transition strengths, decay patterns, and the energy systematics for two-quasiparticle states in N = 102 isotones. The underlying mechanism of two-quasiparticle excitations in the doubly midshell region is discussed in comparison with the deformed QRPA and multi-quasiparticle calculations. In ¹⁶⁹Dy, the B(E2) value for the transition de-exciting the previously unreported Kπ = (1/2⁻) isomeric state at 166 keV to the Kπ = (5/2⁻) ground state is approximately two orders of magnitude larger than the E2 strength for the corresponding isomeric-decay transition in the N = 103 isotone ¹⁷³Yb, suggesting the presence of a significant γ-vibrational admixture with a dominant neutron one-quasiparticle component in the isomeric state.

Published
2019
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5. Discovery and cross-section measurement of neutron-rich isotopes in the element range from neodymium to platinum with the FRS

Author

M. V. Ricciardi, C. Scheidenberger, P. R P Allegro, Helmut Weick, E. Merchan, J. Stadlmann, Yu. A. Litvinov, M. Bunce, J. S. Winfield, F. Naqvi, Ph. Woods, Imrich Szarka, Toshiyuki Kubo, P. Spiller, A. Prochazka, Branislav Sitar, A. Bail, G. Benzoni, R. Janik, R. Knöbel, Satoru Terashima, A. Gottardo, Bao-Hua Sun, Zs. Podolyák, A. Kelic-Heil, S. Pietri, E. Gregor, G. Belier, Hans Geissel, Iris Dillmann, R. Caballero-Folch, B. Riese, P. H. Regan, M. Pomorski, Ivan Mukha, A. Evdokimov, C. Nociforo, J. J. Valiente-Dobón, J. Gerl, J. Taieb, Peter Strmen, M. Winkler, J. Benlliure, J. Kurcewicz, M. Bowry, M. Pfützner, A. Estrade, and F. Farinon

Subjects
Physics, Nuclear and High Energy Physics, Isotope, FOS: Physical sciences, chemistry.chemical_element, Neodymium, Nuclear physics, chemistry, Neutron, Physics::Atomic Physics, Atomic number, Nuclear Experiment (nucl-ex), Nuclear Experiment, Platinum
Abstract

With a new detector setup and the high-resolution performance of the fragment separator FRS at GSI we discovered 57 new isotopes in the atomic number range of 60$\leq Z \leq 78$: \nuc{159-161}{Nb}, \nuc{160-163}{Pm}, \nuc{163-166}Sm, \nuc{167-168}{Eu}, \nuc{167-171}{Gd}, \nuc{169-171}{Tb}, \nuc{171-174}{Dy}, \nuc{173-176}{Ho}, \nuc{176-178}{Er}, \nuc{178-181}{Tm}, \nuc{183-185}{Yb}, \nuc{187-188}{Lu}, \nuc{191}{Hf}, \nuc{193-194}{Ta}, \nuc{196-197}{W}, \nuc{199-200}{Re}, \nuc{201-203}{Os}, \nuc{204-205}{Ir} and \nuc{206-209}{Pt}. The new isotopes have been unambiguously identified in reactions with a $^{238}$U beam impinging on a Be target at 1 GeV/u. The isotopic production cross-section for the new isotopes have been measured and compared with predictions of different model calculations. In general, the ABRABLA and COFRA models agree better than a factor of two with the new data, whereas the semiempirical EPAX model deviates much more. Projectile fragmentation is the dominant reaction creating the new isotopes, whereas fission contributes significantly only up to about the element holmium., 9 pages, 4 figures

Published
2012
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6. Interaction cross sections for Ne isotopes towards the island of inversion and halo structures of 29Ne and 31Ne

Author

I. Hachiuma, Hiroyuki Takeda, Tetsuaki Moriguchi, M. Nagashima, Yoko Ishibashi, Rui-Jiu Chen, Takuji Izumikawa, K. Yoshida, Yu-Gang Ma, H. Suzuki, Y. Yasuda, A. Yoshida, Takashi Ohtsubo, R. Watanabe, Hiroyoshi Sakurai, Masao Ohtake, Toshiyuki Kubo, M. Winkler, Takeshi Suda, Mattias Lantz, Y. Ohkuma, Masamichi Ishihara, Kensuke Kusaka, S. Takeuchi, Toshio Suzuki, Y. Miyashita, Kensaku Matsuta, Y. Shimbara, Yoshiyuki Yanagisawa, A. Ozawa, K. Namihira, Hans Geissel, D. Nagae, Sadao Momota, K. Tanaka, D. Nishimura, Tsuyoshi Ohnishi, Naoki Fukuda, Takayuki Yamaguchi, Deqing Fang, Nori Aoi, K. Yoshinaga, T. Kuboki, K. Ogawa, M. Fukuda, Mototsugu Mihara, M. Takechi, T. Sumikama, H. Ooishi, S. Suzuki, Daisuke Kameda, Naohito Inabe, and Y. Ito

Subjects
Physics, Nuclear and High Energy Physics, Island of inversion, Nuclear Theory, Sigma, Halo nucleus, Nuclear physics, Neutron, Nuclide, Halo, Nuclear drip line, Atomic physics, Nuclear Experiment, Nucleon
Abstract

Interaction cross sections (sigma(1)) for Me isotopes from the stability line to the vicinity of the neutron drip line have been measured at around 240 MeV/nucleon using BigRIPS at RIBF, RIKEN, The sigma(1) for Ne27-32 in every case exceed the systematic mass-number dependence of sigma(1) for stable nuclei, which can be explained by considering the nuclear deformation. In particular the sigma(1) for Ne-29 and Ne-31 are significantly greater than those of their neighboring nuclides. These enhancements of sigma(1) for Ne-29 and Ne-31 cannot be explained by a single-particle model calculation under the assumption that the valence neutron of Ne-29 (Ne-31) occupies the 0d(3/2) (0f(7/2)) orbital, as expected from the standard spherical shell ordering. The present data suggest an s dominant halo structure of Ne-29 and s- or p-orbital halo in Ne-31. (C) 2011 Elsevier B.V. All rights reserved.

Published
2012
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7. Excitation energy dependence of the giant dipole resonance in hot nuclei

Author

K. Yoshida, H. Hama, K. Ieki, K. Furutaka, Toshiyuki Kubo, M. Kodama, M. Sakurai, J. Kasagi, M. Ishihara, and W. Galster

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Bremsstrahlung, Resonance (particle physics), Spectral line, Coincidence, Dipole, Excited state, Atomic physics, Nuclear Experiment, Excitation
Abstract

High energy γ-rays were measured with a large BaF2 detector in coincidence with fusion residues produced in the 92 Mo+ 40 Ar reactions at E A=21 and 26 MeV . The obtained γ-ray spectra were compared with statistical calculations for γ-ray transitions from highly excited nuclei. Contributions of bremsstrahlung in the early stages of the reaction were subtracted. The evolution of the GDR γ-ray yields and the shape of the γ-ray spectra are well reproduced by calculations in which the width of the GDR increases with the excitation energy.

Published
1990
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8. Long-lived K isomer and enhanced γ vibration in the neutron-rich nucleus 172Dy: Collectivity beyond double midshell

Author

I. Nishizuka, P. A. Söderström, A. Estrade, Eiji Ideguchi, G. J. Lane, Giuseppe Lorusso, J. J. Valiente-Dobón, Jin Wu, J. Liu, F. G. Kondev, Zsolt Podolyak, Naohito Inabe, P. M. Walker, S. Kanaya, I. Kojouharov, Zhengyu Xu, Shigeru Kubono, H. Schaffner, Shunji Nishimura, Gavin Lotay, Kenichi Yoshida, Hiroyoshi Sakurai, Zena Patel, P. Lee, V. H. Phong, Hirofumi Watanabe, Y. Shimizu, C. R. Nita, Chang-Bum Moon, H. Kanaoka, Alison Bruce, Zs. Vajta, Toshiyuki Sumikama, Ayumi Yagi, G. X. Zhang, Hiroshi Suzuki, C. S. Lee, Toshiyuki Kubo, P. H. Regan, Hiroyuki Takeda, Thamer Alharbi, Z. Korkulu, Atsuko Odahara, C. J. Griffin, T. Isobe, F. Browne, D. S. Ahn, István Kuti, Satoru Terashima, C. M. Shand, Oliver J. Roberts, H. Baba, Zsolt Dombrádi, Eunji Lee, Naoki Fukuda, Raymond J. Carroll, S. Lalkovski, K. Y. Chae, P. Doornenbal, and N. Kurz

Subjects
Nuclear and High Energy Physics, Fission, 01 natural sciences, K isomer, 0103 physical sciences, medicine, Neutron, ddc:530, 010306 general physics, Spectroscopy, Physics, 172Dy, 010308 nuclear & particles physics, Decay spectroscopy, Axial symmetry, lcsh:QC1-999, medicine.anatomical_structure, Quasiparticle, Level structure, γ vibration, Atomic physics, Nucleus, lcsh:Physics, Excitation, Beam (structure)
Abstract

Physics letters / B 760, 641 - 646 (2016). doi:10.1016/j.physletb.2016.07.057, Published by North-Holland Publ., Amsterdam

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