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Your search keyword '"D13 Stable and unstable nuclei"' showing total 8 results
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8 results on '"D13 Stable and unstable nuclei"'

1. Hartree–Fock–Bogoliubov theory for odd-mass nuclei with a time-odd constraint and application to deformed halo nuclei

Author

00567547, Kasuya, Haruki, Yoshida, Kenichi, 00567547, Kasuya, Haruki, and Yoshida, Kenichi

Abstract

We show that the lowest-energy solution of the Hartree–Fock–Bogoliubov (HFB) equation has even particle-number parity as long as the time-reversal symmetry is conserved in the HFB Hamiltonian without null eigenvalues. Based on this finding, we give a rigorous foundation for a method for solving the HFB equation to describe the ground state of odd-mass nuclei by employing a time-reversal antisymmetric constraint operator to the Hamiltonian, where one obtains directly the ground state as a self-consistent solution of the cranked-HFB-type equation. Numerical analysis is performed for the neutron-rich Mg isotopes with a reasonable choice for the operator, and it is demonstrated that the anomalous increase in the matter radius of ³⁷Mg is well described when the last neutron occupies a low-angular-momentum orbital in the framework of the nuclear energy density functional method, revealing the deformed halo structure.

Published
2021

2. Complex scaling: Physics of unbound light nuclei and perspective

Author

Myo, Takayuki, 1000020109416, Katō, Kiyoshi, Myo, Takayuki, 1000020109416, and Katō, Kiyoshi

Abstract

The complex scaling method (CSM) is one of the most powerful methods of describing the resonances with complex energy eigenstates based on non-Hermitian quantum mechanics. We present the basic application of CSM to the properties of the unbound phenomena of light nuclei. In particular, we focus on many-body resonant and non-resonant continuum states observed in unstable nuclei. We also investigate the continuum level density (CLD) in the scattering problem in terms of the Green’s function with CSM. We discuss the explicit effects of resonant and non-resonant contributions in CLD and transition strength functions.

Published
2020

3. Hartree-Fock-Bogoliubov theory for odd-mass nuclei with a time-odd constraint and application to deformed halo nuclei

Author

Haruki Kasuya and Kenichi Yoshida

Subjects
D13 Stable and unstable nuclei, Nuclear Theory, Hartree–Fock method, General Physics and Astronomy, FOS: Physical sciences, 01 natural sciences, Nuclear Theory (nucl-th), symbols.namesake, 0103 physical sciences, D11 Models of nuclear structure, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear theory, Nuclear Experiment, Mathematical physics, Physics, 010308 nuclear & particles physics, Numerical analysis, Parity (physics), D10 Nuclear many-body theories, symbols, Halo, Ground state, Hamiltonian (quantum mechanics), D12 General properties of nuclei --- systematics and theoretical analysis
Abstract

We show that the lowest-energy solution of the Hartree-Fock-Bogoliubov (HFB) equation has the even particle-number parity as long as the time-reversal symmetry is conserved in the HFB Hamiltonian without null eigenvalues. Based on this finding, we give a rigorous foundation of a method for solving the HFB equation to describe the ground state of odd-mass nuclei by employing a time-reversal anti-symmetric constraint operator to the Hamiltonian, where one obtains directly the ground state as a self-consistent solution of the cranked-HFB-type equation. Numerical analysis is done for the neutron-rich Mg isotopes with a reasonable choice for the operator, and it is demonstrated that the anomalous increase in the matter radius of $^{37}$Mg is well described when the last neutron occupies a low angular-momentum orbital in the framework of the nuclear energy-density-functional method, revealing the deformed halo structure., Comment: 34 pages, 4 figures, to appear in PTEP

Published
2020
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5. Complex scaling: Physics of unbound light nuclei and perspective

Author

Takayuki Myo and Kiyoshi Katō

Subjects
Physics, Light nucleus, Nuclear Theory, D13 Stable and unstable nuclei, Atomic Physics (physics.atom-ph), 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Perspective (graphical), FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, Physics - Atomic Physics, Nuclear Theory (nucl-th), D10 Nuclear many-body theories, Theoretical physics, 0103 physical sciences, D11 Models of nuclear structure, 010306 general physics, Nuclear theory, Scaling
Abstract

The complex scaling method (CSM) is one of the most powerful methods of describing the resonances with complex energy eigenstates, based on non-Hermitian quantum mechanics. We present the basic application of CSM to the properties of the unbound phenomena of light nuclei. In particular, we focus on many-body resonant and non-resonant continuum states observed in unstable nuclei. We also investigate the continuum level density (CLD) in the scattering problem in terms of the Green's function with CSM. We discuss the explicit effects of resonant and non-resonant contributions in CLD and transition strength functions., 38 pages, 33 figures, to be published in Progress of Theoretical and Experimental Physics

Published
2020

6. Beta-gamma spectroscopy of the neutron-rich 150Ba

Author

Hiroyoshi Sakurai, Shunji Nishimura, Atsuko Odahara, G. Gey, Toshiyuki Sumikama, Hiroyuki Takeda, G. Benzoni, Eiji Ideguchi, D. Kameda, Rin Yokoyama, E. Sahin, Shintaro Go, Chang-Bum Moon, L. Sinclair, P. Doornenbal, M. Tanaka, K. Kobayashi, Zena Patel, Zs. Vajta, Z. H. Li, F. L. Bello Garrote, I. Nishizuka, Giuseppe Lorusso, Y. F. Fang, Hirofumi Watanabe, R. Daido, A. Gottardo, Hiroshi Suzuki, Stephen Rice, H. Schaffner, István Kuti, Jan Taprogge, Masafumi Matsushita, Hiroki Nishibata, G. S. Simpson, Motoki Kobayashi, P. A. Söderström, I. Kojouharov, Nori Aoi, Zhengyu Xu, F. Browne, Naohito Inabe, H. Baba, N. Kurz, Naoki Fukuda, T. Komatsubara, T. Inakura, T. Isobe, Shin'ichiro Michimasa, Ayumi Yagi, Toshiyuki Kubo, Jin Wu, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP ), Université Grenoble Alpes (UGA), Institut Laue-Langevin (ILL), ILL, and Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes (UGA)

Subjects
Physics, D13 Stable and unstable nuclei, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, Radiochemistry, General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, D29 Nuclear decays and radioactivities (including fission), 0103 physical sciences, Physics::Accelerator Physics, D11 Models of nuclear structure, Neutron, Gamma spectroscopy, Nuclear Experiment, 010306 general physics, Beta (finance), D12 General properties of nuclei --- systematics and theoretical analysis
Abstract

International audience; Excited states in the neutron-rich nucleus 150Ba have been observed via β–γ spectroscopy at the Radioactive Isotope Beam Factory, RIKEN Nishina Center. The 150Ba ions were produced by the in-flight fission of a 238U beam with an energy of 345 MeV/nucleon. The E(2+) energy of 150Ba was identified at 100 keV, which is the lowest known in the neutron-rich Ba isotopes. A γ -ray peak was also observed at 597 keV. A mean-field calculation with a fully 3D real space was performed and a static octupole deformation was obtained for the Ba isotopes. Kπ = 0− and 1− excited states with significant octupole collectivity were newly predicted at around or lower than 1 MeV on the ground state of 150Ba by a random-phase approximation calculation. The 597 keV γ ray can be interpreted as a negative-parity state, showing that 150Ba may possess octupole collectivity.

Published
2018
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7. Exclusive quasi-free proton knockout from oxygen isotopes at intermediate energies

Author

Kazuyuki Ogata, Shinsuke Ota, T. Fukunaga, Juzo Zenihiro, C. S. Lee, S. S. Stepanyan, T. Suzuki, Masaki Sasano, Takashi Wakui, Masanori Dozono, Elizabeth Padilla-Rodal, N. Inabe, Hiroshi Tokieda, Motonobu Takaki, Yukie Maeda, Naoki Fukuda, A. Galindo-Uribarri, W. Kim, Kensuke Kusaka, Kazuki Yoshida, Atsushi Tamii, Tomotsugu Wakasa, Rin Yokoyama, Yoshiyuki Yanagisawa, Hiroyuki Takeda, Tetsuo Noro, Satoshi Sakaguchi, Y. Nozawa, T. L. Tang, Koichi Yoshida, Shin'ichiro Michimasa, Didier Beaumel, J. Yasuda, Alexandre Obertelli, Hiroaki Matsubara, Hiroshi Suzuki, Motoki Kobayashi, K. Kisamori, T. Kawahara, Kentaro Yako, Toshiyuki Kubo, Hiroyuki Miya, Takahiro Kawabata, Yuki Kubota, T. Fujii, Shoichiro Kawase, Tomohiro Uesaka, Hideyuki Sakai, Susumu Shimoura, Sanghoon Hwang, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
Physics, D13 Stable and unstable nuclei, 010308 nuclear & particles physics, Nuclear Theory, General Physics and Astronomy, D27 Reactions induced by unstable nuclei, Impulse (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Isotopes of oxygen, 13. Climate action, Ab initio quantum chemistry methods, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment
Abstract

International audience; The dependence of the single-particle strength on the difference between proton and neutron separation energies is studied for oxygen isotopes in a wide range of isospins. The cross sections of the quasi-free (p, 2p) reaction on 14,16,18,22,24O were measured at intermediate energies. The measured cross sections are compared to predictions based on the distorted wave impulse approximation and shell-model psd valence-space spectroscopic factors. The reduction factors, which are the ratio of the experimental cross sections to the theoretical predictions, show no apparent dependence on the proton–neutron separation energy difference. The result is compatible with the result of the (e, e p) reaction on stable targets and with the predictions of recent ab initio calculations.

Published
2018
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8. Modeling the double charge exchange response function for a tetraneutron system

Author

Jaume Carbonell, Emiko Hiyama, Rimantas Lazauskas, Institut Pluridisciplinaire Hubert Curien (IPHC), Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien ( IPHC ), Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA ), Institut de Physique Nucléaire d'Orsay ( IPNO ), and Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS )

Subjects
Physics, Nuclear Theory, D13 Stable and unstable nuclei, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, General Physics and Astronomy, Zero-point energy, FOS: Physical sciences, 01 natural sciences, Nuclear Theory (nucl-th), symbols.namesake, Quantum electrodynamics, 0103 physical sciences, Tetraneutron, symbols, D13, 010306 general physics, Hamiltonian (quantum mechanics), [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th], Charge exchange
Abstract

International audience; This work is an attempt to model the 4n response function of a recent RIKEN experimental study of the double charge exchange 4He( 8He, 8Be) 4n reaction in order to put in evidence an eventual enhancement mechanism of the zero-energy cross section, including a near-threshold resonance. This resonance can indeed be reproduced only by adding to the standard nuclear Hamiltonian an unphysically large T=3/2 attractive 3n-force that destroys the neighboring nuclear chart. No other mechanisms, like cusps or related structures, were found.

Published
2017
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