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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. PHYSICAL REVIEW LETTERS 2021; 127:222501. [PMID: 34889627 DOI: 10.1103/physrevlett.127.222501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [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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Umar A, Simenel C, Ayik S, Godbey K. Equilibration dynamics in nuclear reactions. EPJ WEB OF CONFERENCES 2019. [DOI: 10.1051/epjconf/201922301066] [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 discuss the equilibration dynamics and time–scales for various quantities that are connected to the experimentally observable entities. These include the study of mass, isospin, and total kinetic energy (TKE)equilibration time–scales as well as the time–scale for fluctuations.
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Attosecond coherent control of free-electron wave functions using semi-infinite light fields. Nat Commun 2018; 9:2694. [PMID: 30002367 PMCID: PMC6043599 DOI: 10.1038/s41467-018-05021-x] [Citation(s) in RCA: 95] [Impact Index Per Article: 15.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2018] [Accepted: 06/11/2018] [Indexed: 12/02/2022] Open
Abstract
Light–electron interaction is the seminal ingredient in free-electron lasers and dynamical investigation of matter. Pushing the coherent control of electrons by light to the attosecond timescale and below would enable unprecedented applications in quantum circuits and exploration of electronic motions and nuclear phenomena. Here we demonstrate attosecond coherent manipulation of a free-electron wave function, and show that it can be pushed down to the zeptosecond regime. We make a relativistic single-electron wavepacket interact in free-space with a semi-infinite light field generated by two light pulses reflected from a mirror and delayed by fractions of the optical cycle. The amplitude and phase of the resulting electron–state coherent oscillations are mapped in energy-momentum space via momentum-resolved ultrafast electron spectroscopy. The experimental results are in full agreement with our analytical theory, which predicts access to the zeptosecond timescale by adopting semi-infinite X-ray pulses. Manipulation of the electron–photon coupling is crucial for quantum circuits and exploration of electronic motions and nuclear phenomena. Here the authors discuss a scheme to coherently control the electron wave function from attosecond to zeptosecond timescales by using semi-infinite light fields.
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Williams E, Sekizawa K, Hinde DJ, Simenel C, Dasgupta M, Carter IP, Cook KJ, Jeung DY, McNeil SD, Palshetkar CS, Rafferty DC, Ramachandran K, Wakhle A. Exploring Zeptosecond Quantum Equilibration Dynamics: From Deep-Inelastic to Fusion-Fission Outcomes in ^{58}Ni+^{60}Ni Reactions. PHYSICAL REVIEW LETTERS 2018; 120:022501. [PMID: 29376683 DOI: 10.1103/physrevlett.120.022501] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2017] [Revised: 10/27/2017] [Indexed: 06/07/2023]
Abstract
Energy dissipative processes play a key role in how quantum many-body systems dynamically evolve toward equilibrium. In closed quantum systems, such processes are attributed to the transfer of energy from collective motion to single-particle degrees of freedom; however, the quantum many-body dynamics of this evolutionary process is poorly understood. To explore energy dissipative phenomena and equilibration dynamics in one such system, an experimental investigation of deep-inelastic and fusion-fission outcomes in the ^{58}Ni+^{60}Ni reaction has been carried out. Experimental outcomes have been compared to theoretical predictions using time dependent Hartree-Fock and time dependent random phase approximation approaches, which, respectively, incorporate one-body energy dissipation and fluctuations. Excellent quantitative agreement has been found between experiment and calculations, indicating that microscopic models incorporating one-body dissipation and fluctuations provide a potential tool for exploring dissipation in low-energy heavy ion collisions.
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Affiliation(s)
- E Williams
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - K Sekizawa
- Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw, Poland
| | - D J Hinde
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - C Simenel
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - M Dasgupta
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - I P Carter
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - K J Cook
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - D Y Jeung
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - S D McNeil
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - C S Palshetkar
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - D C Rafferty
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - K Ramachandran
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
| | - A Wakhle
- Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 2601, Australia
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Ray A, Sikdar AK, Pandit D, Bhattacharyya S, Bhattacharya S, De A, Paul S, Chatterjee A. Direct observation of slow fission from the width of K x-ray line. EPJ WEB OF CONFERENCES 2018. [DOI: 10.1051/epjconf/201819304004] [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
An atomic clock based on the measurement of the intrinsic width of K x-ray lines has been used to obtain evidence of long-lived fission of the highly excited plutonium nuclei produced in the fusion of 4He+238U at E(4He)Lab=60 MeV. The mean fission time of the long-lived fission could be obtained from the increase of the intrinsic width of plutonium K x-ray line using quantum energy-time uncertainty principle. The presence of long-lived fission (mean fission time >1×10-18 s) has been found and the fluorescence yield per fission event shows that most of the fission events are slow (~10-18 s).
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Andreyev AN, Nishio K, Schmidt KH. Nuclear fission: a review of experimental advances and phenomenology. REPORTS ON PROGRESS IN PHYSICS. PHYSICAL SOCIETY (GREAT BRITAIN) 2018; 81:016301. [PMID: 28753131 DOI: 10.1088/1361-6633/aa82eb] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In the last two decades, through technological, experimental and theoretical advances, the situation in experimental fission studies has changed dramatically. With the use of advanced production and detection techniques both much more detailed and precise information can now be obtained for the traditional regions of fission research and, crucially, new regions of nuclei have become routinely accessible for fission studies. This work first of all reviews the recent developments in experimental fission techniques, in particular the resurgence of transfer-induced fission reactions with light and heavy ions, the emerging use of inverse-kinematic approaches, both at Coulomb and relativistic energies, and of fission studies with radioactive beams. The emphasis on the fission-fragment mass and charge distributions will be made in this work, though some of the other fission observables, such as prompt neutron and γ-ray emission will also be reviewed. A particular attention will be given to the low-energy fission in the so far scarcely explored nuclei in the very neutron-deficient lead region. They recently became the focus for several complementary experimental studies, such as β-delayed fission with radioactive beams at ISOLDE(CERN), Coulex-induced fission of relativistic secondary beams at FRS(GSI), and several prompt fusion-fission studies. The synergy of these approaches allows a unique insight in the new region of asymmetric fission around [Formula: see text]Hg, recently discovered at ISOLDE. Recent extensive theoretical efforts in this region will also be outlined. The unprecedented high-quality data for fission fragments, completely identified in Z and A, by means of reactions in inverse kinematics at FRS(GSI) and VAMOS(GANIL) will be also reviewed. These experiments explored an extended range of mercury-to-californium elements, spanning from the neutron-deficient to neutron-rich nuclides, and covering both asymmetric, symmetric and transitional fission regions. Some aspects of heavy-ion induced fusion-fission and quasifission reactions will be also discussed, which reveal their dynamical features, such as the fission time scale. The crucial role of the multi-chance fission, probed by means of multinucleon-transfer induced fission reactions, will be highlighted. The review will conclude with the discussion of the new experimental fission facilities which are presently being brought into operation, along with promising 'next-generation' fission approaches, which might become available within the next decade.
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Affiliation(s)
- A N Andreyev
- Department of Physics, University of York, York, YO10 5DD, United Kingdom. Advanced Science Research Center, Japan Atomic Energy Agency, Tokai, Ibaraki 319-1195, Japan
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Hinde D, Dasgupta M, Jeung D, Mohanto G, Prasad E, Simenel C, Williams E, Carter I, Cook K, Kalkal S, Rafferty D, Simpson E, David H, Düllmann C, Khuyagbaatar J. Quasifission Dynamics in the Formation of Superheavy Elements. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201716300023] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Umar A, Simenel C, Ayik S. Time-dependent mean-field investigations of the quasifission process. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201716300061] [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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Hinde D, Dasgupta M, Jeung D, Mohanto G, Prasad E, Simenel C, Walshe J, Wahkle A, Williams E, Carter I, Cook K, Kalkal S, Rafferty D, Rietz RD, Simpson E, David H, Düllmann C, Khuyagbaatar J. Quasifission in heavy and superheavy element formation reactions. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201613104004] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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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 OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201612303005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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11
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Hinde D, Williams E, Mohanto G, Simenel C, Dasgupta M, Wakhle A, Carter I, Cook K, Jeung D, Luong D, Palshetkar C, Prasad E, Rafferty D, du Rietz R, Simpson E. Systematic study of quasifission characteristics and timescales in heavy element formation reactions. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611708006] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bulgac A, Magierski P, Roche KJ, Stetcu I. Induced Fission of (240)Pu within a Real-Time Microscopic Framework. PHYSICAL REVIEW LETTERS 2016; 116:122504. [PMID: 27058076 DOI: 10.1103/physrevlett.116.122504] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Indexed: 06/05/2023]
Abstract
We describe the fissioning dynamics of ^{240}Pu from a configuration in the proximity of the outer fission barrier to full scission and the formation of the fragments within an implementation of density functional theory extended to superfluid systems and real-time dynamics. The fission fragments emerge with properties similar to those determined experimentally, while the fission dynamics appears to be quite complex, with many excited shape and pairing modes. The evolution is found to be much slower than previously expected, and the ultimate role of the collective inertia is found to be negligible in this fully nonadiabatic treatment of nuclear dynamics, where all collective degrees of freedom (CDOF) are included (unlike adiabatic treatments with a small number of CDOF).
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Affiliation(s)
- Aurel Bulgac
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
| | - Piotr Magierski
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
- Faculty of Physics, Warsaw University of Technology, ulica Koszykowa 75, 00-662 Warsaw, Poland
| | - Kenneth J Roche
- Department of Physics, University of Washington, Seattle, Washington 98195-1560, USA
- Pacific Northwest National Laboratory, Richland, Washington 99352, USA
| | - Ionel Stetcu
- Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
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13
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Umar A, Oberacker V, Simenel C. Quasifission dynamics in TDHF. EPJ WEB OF CONFERENCES 2016. [DOI: 10.1051/epjconf/201611701002] [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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14
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Hinde D, Williams E, du Rietz R, Dasgupta M, Wakhle A, Simenel C, Luong D, Cook K. Mapping quasifission characteristics in heavy element formation reactions. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158600015] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Wakhle A, Simenel C, Hinde D, Dasgupta M, Evers M, Luong D, du Rietz R. Comparing Experimental and Theoretical Quasifission Mass Angle Distributions. EPJ WEB OF CONFERENCES 2015. [DOI: 10.1051/epjconf/20158600061] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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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. PHYSICAL REVIEW LETTERS 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] [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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Hinde D, du Rietz R, Williams E, Simenel C, Lin C, Wakhle A, Cook K, Dasgupta M, Evers M, Luong D. Mass-angle distributions. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146603037] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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20
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Dasgupta M, Luong D, Hinde D, Evers M. Many-body Quantum Reaction Dynamics near the Fusion Barrier. EPJ WEB OF CONFERENCES 2014. [DOI: 10.1051/epjconf/20146601003] [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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Morjean M, Chbihi A, Dasgupta M, Drouart A, Frankland J, Frégeau J, Hinde D, Jacquet D, Nalpas L, Pârlog M, Simenel C, Tassan-Got L, Williams E. Long lifetime components in the decay of excited super-heavy nuclei. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20136302011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Khuyagbaatar J, Hinde D, du Rietz R, Carter IP, Dasgupta M, Düllmann C, Evers M, Wakhle A, Williams E, Yakushev A. Study of fusion reactions forming Cf nuclei. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20136302015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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23
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Simenel C, Dasgupta M, Hinde DJ, Kheifets A, Wakhle A. Probing quantum many-body dynamics in nuclear systems. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20136302001] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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24
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Hinde DJ, Dasgupta M, Carter I, Cook K, Evers M, Luong D, Ramachandran K, Rafferty D, Simenel C, Wakhle A, Williams E. Nuclear Reaction Dynamics Research at the Australian National University. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20136302005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kohley Z. Near-barrier reactions with radioactive ion beams at the ReA3 facility. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20136302003] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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26
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Knyazheva G, Bogachev A, Itkis I, Itkis M, Kozulin E. Mass distributions for quasifission processes in superheavy compositesystems with Z=108-120. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20136302014] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Frégeau MO, Jacquet D, Morjean M, Bonnet E, Chbihi A, Frankland JD, Rivet MF, Tassan-Got L, Dechery F, Drouart A, Nalpas L, Ledoux X, Parlog M, Ciortea C, Dumitriu D, Fluerasu D, Gugiu M, Gramegna F, Kravchuk VL, Marchi T, Fabris D, Corsi A, Barlini S. X-ray fluorescence from the element with atomic number Z=120. PHYSICAL REVIEW LETTERS 2012; 108:122701. [PMID: 22540578 DOI: 10.1103/physrevlett.108.122701] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2011] [Indexed: 05/31/2023]
Abstract
An atomic clock based on x-ray fluorescence yields has been used to estimate the mean characteristic time for fusion followed by fission in reactions 238U + 64Ni at 6.6 MeV/A. Inner shell vacancies are created during the collisions in the electronic structure of the possibly formed Z=120 compound nuclei. The filling of these vacancies accompanied by a x-ray emission with energies characteristic of Z=120 can take place only if the atomic transitions occur before nuclear fission. Therefore, the x-ray yield characteristic of the united atom with 120 protons is strongly related to the fission time and to the vacancy lifetimes. K x rays from the element with Z=120 have been unambiguously identified from a coupled analysis of the involved nuclear reaction mechanisms and of the measured photon spectra. A minimum mean fission time τ(f)=2.5×10(-18) s has been deduced for Z=120 from the measured x-ray multiplicity.
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Affiliation(s)
- M O Frégeau
- GANIL, CEA-DSM and IN2P3-CNRS, B.P. 55027, F-14076 Caen Cedex, France
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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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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29
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Wakhle A, Hinde D, Dasgupta M, du Rietz R, Simenel C, Evers M, Luong D, Rafiei R. Quasifission and Shell Effects in Reactions Forming 266Sg. EPJ WEB OF CONFERENCES 2012. [DOI: 10.1051/epjconf/20123505008] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Aritomo Y, Hinde DJ, Wakhle A, du Rietz R, Dasgupta M, Hagino K, Chiba S, Nishio K. Dynamical approach to fusion-fission process in superheavy mass region. EPJ WEB OF CONFERENCES 2012. [DOI: 10.1051/epjconf/20123505001] [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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