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3 results on '"C. J. Griffin"'

1. Isomer spectroscopy of neutron-rich 168Tb103

Author

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

Subjects
Radiation, Spectrometer, 010308 nuclear & particles physics, Chemistry, Fission, Nuclear Theory, chemistry.chemical_element, Germanium, 01 natural sciences, Semiconductor detector, Nuclear physics, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleon, Spectroscopy
Abstract

In-flight fission of a 345 MeV per nucleon 238U primary beam on a 2 mm thick 9Be target has been used to produce and study the decays of a range of neutron-rich nuclei centred around the doubly mid-shell nucleus 170Dy at the RIBF Facility, RIKEN, Japan. The produced secondary fragments of interest were identified eventby- event using the BigRIPS separator. The fragments were implanted into the WAS3ABI position sensitive silicon active stopper which allowed pixelated correlations between implants and their subsequent β-decay. Discrete γ-ray transitions emitted following decays from either metastable states or excited states populated following beta decay were identified using the 84 coaxial high-purity germanium (HPGe) detectors of the EURICA spectrometer, which was complemented by 18 additional cerium-doped lanthanum bromide (LaBr3)

Published
2017

2. 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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3. 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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