1
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Yang ZH, Ye YL, Zhou B, Baba H, Chen RJ, Ge YC, Hu BS, Hua H, Jiang DX, Kimura M, Li C, Li KA, Li JG, Li QT, Li XQ, Li ZH, Lou JL, Nishimura M, Otsu H, Pang DY, Pu WL, Qiao R, Sakaguchi S, Sakurai H, Satou Y, Togano Y, Tshoo K, Wang H, Wang S, Wei K, Xiao J, Xu FR, Yang XF, Yoneda K, You HB, Zheng T. Observation of the Exotic 0_{2}^{+} Cluster State in ^{8}He. PHYSICAL REVIEW LETTERS 2023; 131:242501. [PMID: 38181133 DOI: 10.1103/physrevlett.131.242501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 09/05/2023] [Accepted: 11/01/2023] [Indexed: 01/07/2024]
Abstract
We report here the first observation of the 0_{2}^{+} state of ^{8}He, which has been predicted to feature the condensatelike α+^{2}n+^{2}n cluster structure. We show that this state is characterized by a spin parity of 0^{+}, a large isoscalar monopole transition strength, and the emission of a strongly correlated neutron pair, in line with theoretical predictions. Our finding is further supported by the state-of-the-art microscopic α+4n model calculations. The present results may lead to new insights into clustering in neutron-rich nuclear systems and the pair correlation and condensation in quantum many-body systems under strong interactions.
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Affiliation(s)
- Z H Yang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y L Ye
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - B Zhou
- Key Laboratory of Nuclear Physics and Ion-beam Application (MOE), Institute of Modern Physics, Fudan University, Shanghai 200433, China
- Shanghai Research Center for Theoretical Nuclear Physics, NSFC and Fudan University, Shanghai 200438, China
- Department of Physics, Hokkaido University, 060-0810 Sapporo, Japan
| | - H Baba
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - R J Chen
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - Y C Ge
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - B S Hu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - H Hua
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - D X Jiang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - M Kimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Hokkaido University, 060-0810 Sapporo, Japan
- Nuclear Reaction Data Centre, Hokkaido University, 060-0810 Sapporo, Japan
| | - C Li
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K A Li
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - J G Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Q T Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - X Q Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Z H Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - J L Lou
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - M Nishimura
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H Otsu
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - D Y Pang
- School of Physics and Beijing Key Laboratory of Advanced Nuclear Materials and Physics, Beihang University, Beijing 100191, China
| | - W L Pu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - R Qiao
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - S Sakaguchi
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Kyushu University, 819-0395 Fukuoka, Japan
| | - H Sakurai
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Y Satou
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 34000, Republic of Korea
| | - Y Togano
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Tshoo
- Rare Isotope Science Project, Institute for Basic Science, Daejeon 34000, Republic of Korea
| | - H Wang
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
- Department of Physics, Tokyo Institute of Technology, 2-12-1 Oh-Okayama, Meguro, Tokyo 152-8551, Japan
| | - S Wang
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - K Wei
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - J Xiao
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - F R Xu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - X F Yang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - K Yoneda
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - H B You
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - T Zheng
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
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2
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Chen J, Ye Y, Ma K, Han J, Wang D, Lin C, Jia H, Yang L, Li G, Yang L, Hu Z, Tan Z, Wei K, Pu W, Chen Y, Lou J, Yang X, Li Q, Yang Z, Luo T, Huang D, Zhong S, Li Z, Xu J. New evidence of the Hoyle-like structure in 16O. Sci Bull (Beijing) 2023:S2095-9273(23)00285-2. [PMID: 37193612 DOI: 10.1016/j.scib.2023.04.031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Revised: 04/02/2023] [Accepted: 04/24/2023] [Indexed: 05/18/2023]
Abstract
An experiment of 12C(16O,16O → 4α)12C was performed at a beam energy of 96 MeV. A large number of 4-α events were recorded in coincidence and with full particle identification (PID). This was made possible by employing a series of silicon-strip-based telescopes that provided excellent position and energy resolutions. Four narrow resonances just above the 15.1 MeV state were firmly identified in the α + 12C(7.65 MeV; Hoyle state) decay channel. Combined with the theoretical predictions, these resonant states provide new evidence for the red predicted possible Hoyle-like structure in 16O above the 4-α separation threshold. Some very high-lying 4-α resonant states have also been observed and need to be further investigated.
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Affiliation(s)
- Jiahao Chen
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Yanlin Ye
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China.
| | - Kai Ma
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Jiaxing Han
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Dongxi Wang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Chengjian Lin
- China Institute of Atomic Energy, Beijing 102413, China; College of Physics and Technology & Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin 541004, China
| | - Huiming Jia
- China Institute of Atomic Energy, Beijing 102413, China
| | - Lei Yang
- China Institute of Atomic Energy, Beijing 102413, China
| | - Gen Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Lisheng Yang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Ziyao Hu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Zhiwei Tan
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Kang Wei
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - WeiLiang Pu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Ying Chen
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Jianling Lou
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Xiaofei Yang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Qite Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Zaihong Yang
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Tianpeng Luo
- China Institute of Atomic Energy, Beijing 102413, China
| | - Dahu Huang
- China Institute of Atomic Energy, Beijing 102413, China; College of Physics and Technology & Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin 541004, China
| | - Shanhao Zhong
- China Institute of Atomic Energy, Beijing 102413, China; College of Physics and Technology & Guangxi Key Laboratory of Nuclear Physics and Technology, Guangxi Normal University, Guilin 541004, China
| | - Zhihuan Li
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
| | - Jinyan Xu
- School of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871, China
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3
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Clustering in nuclear systems: from finite nuclei to neutron stars. Sci Bull (Beijing) 2021; 66:2054-2056. [PMID: 36654261 DOI: 10.1016/j.scib.2021.07.009] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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4
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Funaki Y. Container evolution and dynamics of cluster formation. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201819406002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We introduce the so-called Tohsaki-Horiuchi-Schuck-Röpke (THSR) wave function to describe various nuclear cluster states. Its importance, applicability, and usefulness are extensively discussed in this report. It is demonstrated that the THSR wave function provides a “container” picture for cluster structures and even an evolution of the container, for a couple of typical examples, such as 20Ne, 12C, and 16O nuclei.
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5
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Zhou B, Ren Z. Nonlocalized clustering in nuclei. ADVANCES IN PHYSICS: X 2017. [DOI: 10.1080/23746149.2017.1294033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Affiliation(s)
- Bo Zhou
- Institute for International Collaboration & Faculty of Science, Hokkaido University, Sapporo, Japan
| | - Zhongzhou Ren
- Department of Physics, Nanjing University, Nanjing, China
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6
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Spieker M, Pascu S, Zilges A, Iachello F. Origin of low-lying enhanced E1 strength in rare-Earth nuclei. PHYSICAL REVIEW LETTERS 2015; 114:192504. [PMID: 26024168 DOI: 10.1103/physrevlett.114.192504] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2014] [Indexed: 06/04/2023]
Abstract
The experimental E1 strength distribution below 4 MeV in rare-earth nuclei suggests a local breaking of isospin symmetry. In addition to the octupole states, additional J^{π}=1^{-} states with enhanced E1 strength have been observed in rare-earth nuclei by means of (γ,γ') experiments. By reproducing the experimental results, the spdf interacting boson model calculations provide further evidence for the formation of an α cluster in medium-mass nuclei and might provide a new understanding of the origin of low-lying E1 strength.
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Affiliation(s)
- M Spieker
- Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - S Pascu
- Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
- National Institute for Physics and Nuclear Engineering, R-77125 Bucharest-Magurele, Romania
| | - A Zilges
- Institut für Kernphysik, Universität zu Köln, Zülpicher Straße 77, D-50937 Köln, Germany
| | - F Iachello
- Center for Theoretical Physics, Sloane Physics Laboratory, Yale University, New Haven, Connecticut 06520-8120, USA
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7
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Funaki Y. Alpha condensates and nonlocalized cluster structures. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158800025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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8
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Ito M, Ikeda K. Unified studies of chemical bonding structures and resonant scattering in light neutron-excess systems, 10,12Be. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2014; 77:096301. [PMID: 25222183 DOI: 10.1088/0034-4885/77/9/096301] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The generalized two-center cluster model (GTCM), which can treat covalent, ionic and atomic configurations in general systems with two inert cores plus valence nucleons, is formulated in the basis of the microscopic cluster model. In this model, the covalent configurations constructed by the molecular orbital (MO) method and the atomic (or ionic) configuration obtained by the valence bonding (VB) method can be handled in a consistent manner. The GTCM is applied to the light neutron-rich system (10,12)Be = α + α + Xn (X = 2, 4). The continuous and smooth changes of the neutron orbits from the covalent MO states to the ionic VB states are clearly observed in the adiabatic energy surfaces (AESs), which are the energy curves obtained with a variation of the α-α distance. The energy levels obtained from the AESs nicely reproduce the recent observations over a wide energy region. The individual spectra are characterized in terms of chemical-bonding-like structures, such as the covalent MO or ionic VB structures, according to analysis of their intrinsic wave functions. From the analysis of AESs, the formation of the mysterious 0(2)(+) states in (10,12)Be, which have anomalously small excitation energies in comparison to a naive shell-model prediction, is investigated. A large enhancement in a monopole transition from a ground MO state to an ionic α + (6,8)He VB state is found, which seems to be consistent with a recent observation. In the unbound region, the structure problem, which handles the total system of α + α + Xn (X = 2, 4) as a bound or quasi-bound state, and the reaction problem, induced by the collision of an asymptotic VB state of α + (6,8)He, are combined by the GTCM. The properties of unbound resonant states are discussed in close connection to the reaction mechanism, and some enhancement factors originating from the properties of the intrinsic states are predicted in the reaction observables.
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Affiliation(s)
- Makoto Ito
- Department of Pure and Applied Physics, Kansai University, Yamatecho, 3-3-35, Suita, Japan. Research Center for Nuclear Physics (RCNP), Osaka University, Mihogaoka 10-1, Suita 567-0047, Japan. RIKEN Nishina Center for Accelerator-based Science, RIKEN, Wako,351-0198, Saitama, Japan
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9
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Schuck P, Funaki Y, Horiuchi H, Röpke G, Tohsaki A, Yamada T. Theory for Quartet Condensation in Fermi Systems with Applications to Nuclei and Nuclear Matter. ACTA ACUST UNITED AC 2014. [DOI: 10.1088/1742-6596/529/1/012014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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10
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He WB, Ma YG, Cao XG, Cai XZ, Zhang GQ. Giant dipole resonance as a fingerprint of α clustering configurations in 12C and 16O. PHYSICAL REVIEW LETTERS 2014; 113:032506. [PMID: 25083640 DOI: 10.1103/physrevlett.113.032506] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2014] [Indexed: 06/03/2023]
Abstract
It is studied how the α cluster degrees of freedom, such as α clustering configurations close to the α decay threshold in (12)C and (16)O, including the linear chain, triangle, square, kite, and tetrahedron, affect nuclear collective vibrations with a microscopic dynamical approach, which can describe properties of nuclear ground states well across the nuclide chart and reproduce the standard giant dipole resonance (GDR) of (16)O quite nicely. It is found that the GDR spectrum is highly fragmented into several apparent peaks due to the α structure. The different α cluster configurations in (12)C and (16)O have corresponding characteristic spectra of GDR. The number and centroid energies of peaks in the GDR spectra can be reasonably explained by the geometrical and dynamical symmetries of α clustering configurations. Therefore, the GDR can be regarded as a very effective probe to diagnose the different α cluster configurations in light nuclei.
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Affiliation(s)
- W B He
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and University of the Chinese Academy of Sciences, Beijing 100080, China
| | - Y G Ma
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China and Shanghai Tech University, Shanghai 200031, China
| | - X G Cao
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - X Z Cai
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
| | - G Q Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China
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11
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Yang ZH, Ye YL, Li ZH, Lou JL, Wang JS, Jiang DX, Ge YC, Li QT, Hua H, Li XQ, Xu FR, Pei JC, Qiao R, You HB, Wang H, Tian ZY, Li KA, Sun YL, Liu HN, Chen J, Wu J, Li J, Jiang W, Wen C, Yang B, Yang YY, Ma P, Ma JB, Jin SL, Han JL, Lee J. Observation of enhanced monopole strength and clustering in (12)Be. PHYSICAL REVIEW LETTERS 2014; 112:162501. [PMID: 24815641 DOI: 10.1103/physrevlett.112.162501] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2013] [Indexed: 06/03/2023]
Abstract
In a recent breakup-reaction experiment using a Be12 beam at 29 MeV/nucleon, the 0+ band head of the expected He4+He8 molecular rotation was clearly identified at about 10.3 MeV, from which a large monopole matrix element of 7.0±1.0 fm2 and a large cluster-decay width were determined for the first time. These findings support the picture of strong clustering in Be12, which has been a subject of intense investigations over the past decade. The results were obtained thanks to a specially arranged detection system around zero degrees, which is essential in determining the newly emphasized monopole strengths to signal the cluster formation in a nucleus.
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Affiliation(s)
- Z H Yang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y L Ye
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Z H Li
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J L Lou
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J S Wang
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - D X Jiang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y C Ge
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Q T Li
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - H Hua
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - X Q Li
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - F R Xu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J C Pei
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - R Qiao
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - H B You
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - H Wang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - Z Y Tian
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - K A Li
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y L Sun
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - H N Liu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Chen
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - J Wu
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - J Li
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - W Jiang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - C Wen
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China and RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
| | - B Yang
- State Key Laboratory of Nuclear Physics and Technology, School of Physics, Peking University, Beijing 100871, China
| | - Y Y Yang
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - P Ma
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - J B Ma
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - S L Jin
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - J L Han
- Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
| | - J Lee
- RIKEN Nishina Center, 2-1 Hirosawa, Wako, Saitama 351-0198, Japan
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12
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Suhara T, Funaki Y, Zhou B, Horiuchi H, Tohsaki A. One-dimensional α condensation of α-linear-chain states in ¹²C and ¹⁶O. PHYSICAL REVIEW LETTERS 2014; 112:062501. [PMID: 24580688 DOI: 10.1103/physrevlett.112.062501] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2013] [Indexed: 06/03/2023]
Abstract
We present a new picture that the α-linear-chain structure for 12C and 16O has one-dimensional α condensate character. The wave functions of linear-chain states that are described by superposing a large number of Brink wave functions have extremely large overlaps of nearly 100% with single Tohsaki-Horiuchi-Schuck-Röpke wave functions, which were proposed to describe the α condensed "gaslike" states. Although this new picture is different from the conventional idea of the spatial localization of α clusters, the density distributions are shown to have localized α clusters due to the inter-α Pauli repulsion.
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Affiliation(s)
- T Suhara
- Matsue College of Technology, Matsue 690-8518, Japan
| | - Y Funaki
- Nishina Center for Accelerator-Based Science, The Institute of Physical and Chemical Research (RIKEN), Wako 351-0198, Japan
| | - B Zhou
- Department of Physics, Nanjing University, Nanjing 210093, China
| | - H Horiuchi
- Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan
| | - A Tohsaki
- Research Center for Nuclear Physics (RCNP), Osaka University, Osaka 567-0047, Japan
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13
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Girod M, Schuck P. α-Particle clustering from expanding self-conjugate nuclei within the Hartree-Fock-Bogoliubov approach. PHYSICAL REVIEW LETTERS 2013; 111:132503. [PMID: 24116773 DOI: 10.1103/physrevlett.111.132503] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2013] [Indexed: 06/02/2023]
Abstract
The nuclear equation of state (EOS) is explored with the constrained Hartree-Fock-Bogoliubov approach for self-conjugate nuclei. It is found that beyond a certain low, more or less universal density, those nuclei spontaneously cluster into A/4 α particles with A the nucleon number. The energy at the threshold density increases linearly with the number of α particles as does the experimental threshold energy. Taking off the spurious c.m. energy of each α particle almost gives agreement between theory and experiment. The implications of these results with respect to α clustering and the nuclear EOS at low density are discussed.
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Affiliation(s)
- M Girod
- CEA, DAM, DIF, F-91297 Arpajon Cedex, France
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