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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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Managlia MV, Bruno M, D’Agostino M, Morelli L, Baiocco G, Gulminelli F, Frosin C, Barlini S, Buccola A, Camaiani A, Casini G, Cicerchia M, Cinausero M, Fabris D, Gramegna F, Mantovani G, Marchi T, Ottanelli P, Pasquali G, Piantelli S, Valdré S. Four α-particles as a final state of 16O * Quasi Projectile decay. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201922301036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Four α-particles as a final state of 16O* quasi-projectile decayproduced in peripheral 16O+12C reactions at 130 MeV is thoroughly studied. The differentdecay channels leading to the four α-particles final state are reconstructed by carrying out an event-by-event analysis of α correlations in the population of intermediate 8Be and 12C. Although small, a non negligible contribution due to 8Begs evaporation is found.A comparison between predictions of an accurate Hauser-Feshbach decay code and branching ratios of the different decay channels is performed. Significant deviations are observed, among these the Hoyle state population which is considerably lower than the one predicted according to the statistical model, thus suggesting possible structure effects in the Coulomb barrier and/or in the transmission coefficients.
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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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Ichikawa T, Maruhn JA, Itagaki N, Ohkubo S. Linear chain structure of four-α clusters in 16O. PHYSICAL REVIEW LETTERS 2011; 107:112501. [PMID: 22026658 DOI: 10.1103/physrevlett.107.112501] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2011] [Indexed: 05/31/2023]
Abstract
We investigate the linear chain configurations of four-α clusters in 16O using a Skyrme cranked Hartree-Fock method and discuss the relationship between the stability of such states and angular momentum. We show the existence of a region of angular momentum (13-18ℏ) where the linear chain configuration is stabilized. For the first time we demonstrate that stable exotic states with a large moment of inertia (ℏ2/2Θ∼0.06-0.08 MeV) can exist.
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Affiliation(s)
- T Ichikawa
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
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Curtis N, Murphy AS, Clarke NM, Freer M, Fulton BR, Hall SJ, Leddy MJ, Pople JS, Tungate G, Ward RP, Catford WN, Gyapong GJ, Singer SM, Chappell SP, Fox SP, Jones CD, Watson DL, Rae WD, Simmons PM, Regan PH. Evidence for a highly deformed band in 16O+16O breakup of 32S. PHYSICAL REVIEW. C, NUCLEAR PHYSICS 1996; 53:1804-1810. [PMID: 9971131 DOI: 10.1103/physrevc.53.1804] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
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