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Tanaka T, Hinde DJ, Dasgupta M, Williams E, Vo-Phuoc K, Simenel C, Simpson EC, Jeung DY, Carter IP, Cook KJ, Lobanov NR, Luong DH, Palshetkar C, Rafferty DC, Ramachandran K. Mass Equilibration and Fluctuations in the Angular Momentum Dependent Dynamics of Heavy Element Synthesis Reactions. Phys Rev Lett 2021; 127:222501. [PMID: 34889627 DOI: 10.1103/physrevlett.127.222501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/12/2021] [Accepted: 11/10/2021] [Indexed: 06/13/2023]
Abstract
Mass and angle distributions for the ^{52}Cr+^{198}Pt and ^{54}Cr+^{196}Pt reactions (both forming ^{250}No) were measured and subtracted, giving new information on fast quasifission mass evolution, and the first direct determination of the dependence of sticking times on angular momentum. TDHF calculations showed good agreement with average experimental values, but experimental mass distributions unexpectedly extended to symmetric splits while the peak yield remained close to the initial masses. This implies a strong role of fluctuations in mass division early in the collision, giving insights into the transition from fast energy dissipative deep-inelastic collisions to quasifission.
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Affiliation(s)
- T Tanaka
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - D J Hinde
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - M Dasgupta
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - E Williams
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - K Vo-Phuoc
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - C Simenel
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
- Department of Fundamental and Theoretical Physics, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - E C Simpson
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - D Y Jeung
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - I P Carter
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - K J Cook
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - N R Lobanov
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - D H Luong
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - C Palshetkar
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - D C Rafferty
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - K Ramachandran
- Department of Nuclear Physics and Accelerator Applications, Research School of Physics, The Australian National University, Canberra, Australian Capital Territory 2601, Australia
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Hinde DJ, Williams E, Mohanto G, Simenel C, Jeung DY, Dasgupta M, Prasad E, Wakhle A, Vo-Phuoc K, Carter IP, Cook KJ, Luong DH, Palshetkar CS, Rafferty DC, Simpson EC. Nuclear structure effects in quasifission – understanding the formation of the heaviest elements. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612303005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Prasad E, Hinde DJ, Williams E, Dasgupta M, Carter IP, Cook KJ, Jeung DY, Luong DH, McNeil S, Palshetkar CS, Rafferty DC, Simenel C, Wakhle A, Ramachandran K, Khuyagbaatar J, Dullmann CE, Lommel B, Kindler B. Mass-asymmetric fission in the 40ca+ 142Nd reaction. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612303006] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Simpson EC, Cook KJ, Dasgupta M, Kalkal S, Luong DH, Carter IP, Hinde DJ, Williams E. Resonances in transfer-triggered breakup of 7Li in near-barrier collisions. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612303002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Dasgupta M, Simpson EC, Luong DH, Kalkal S, Cook KJ, Carter IP, Hinde DJ, Williams E. Breakup locations: Intertwining effects of nuclear structure and reaction dynamics. EPJ Web of Conferences 2016. [DOI: 10.1051/epjconf/201611708005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rafferty DC, Dasgupta M, Hinde DJ, Simenel C, Simpson EC, Williams E, Carter IP, Cook KJ, Luong DH, McNeil SD, Ramachandran K, Vo-Phuoc K, Wakhle A. Probing cluster structures through sub-barrier transfer reactions. EPJ Web Conf 2016. [DOI: 10.1051/epjconf/201612303004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Carter IP, Dasgupta M, Hinde DJ, Luong DH, Williams E, Ramachandran K, Cook KJ, Muirhead AG, Marshall S, Tunningley T. Recent developments of SOLEROO: Australia’s first high energy radioactive Ion Beam capability. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159100001] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Williams E, Hinde DJ, Dasgupta M, du Rietz R, Carter IP, Evers M, Luong DH, McNeil SD, Rafferty DC, Ramachandran K, Wakhle A. How signatures of quasifission evolve in reactions forming Curium. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20158600063] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Rafferty D, Dasgupta M, Hinde D, Simenel C, Cook KJ, Carter IP, Luong DH, McNeil SD, Ramachandran K, Wakhle A, Williams E. Investigating energy dissipation through nucleon transfer reactions. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/20159100010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wakhle A, Simenel C, Hinde DJ, Dasgupta M, Evers M, Luong DH, du Rietz R, Williams E. Interplay between quantum shells and orientation in quasifission. Phys Rev Lett 2014; 113:182502. [PMID: 25396364 DOI: 10.1103/physrevlett.113.182502] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Indexed: 06/04/2023]
Abstract
The quasifission mechanism hinders fusion in heavy systems through breakup within zeptoseconds into two fragments with partial mass equilibration. Its dependence on the structure of both the collision partners and the final fragments is a key question. Our original approach is to combine an experimental measurement of the fragments' mass-angle correlations in (40)Ca+(238)U with microscopic quantum calculations. We demonstrate an unexpected interplay between the orientation of the prolate deformed (238)U with quantum shell effects in the fragments. In particular, calculations show that only collisions with the tip of (238)U produce quasifission fragments in the magic Z=82 region, while collisions with the side are the only ones that may result in fusion.
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Affiliation(s)
- A Wakhle
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - C Simenel
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - D J Hinde
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - M Dasgupta
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - M Evers
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - D H Luong
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - R du Rietz
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
| | - E Williams
- Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
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Carter IP, Ramachandran K, Dasgupta M, Hinde DJ, Rafiei R, Luong DH, Williams E, Cook KJ, McNeil S, Rafferty DC, Harding AB, Muirhead AG, Tunningley T. An Ion Beam Tracking System based on a Parallel Plate Avalanche Counter. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20136302022] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Simenel C, Wakhle A, Avez B, Hinde DJ, Rietz RD, Dasgupta M, Evers M, Lin CJ, Luong DH. Effects of nuclear structure on quasi-fission. EPJ Web of Conferences 2012. [DOI: 10.1051/epjconf/20123809001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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