Examination of the fission time of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>120</mml:mn></mml:mrow></mml:math>nucleus

Sikdar, A. K.; Ray, A.; Chatterjee, A.

doi:10.1103/physrevc.93.041604

Cited by 11 publications

(10 citation statements)

References 19 publications

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“…claimed by the work [477]. However, the recent investigation [300] questioned whether the sensitivity argument can explain this discrepancy.…”

Section: Dissipation and Time Scales In Fissionmentioning

confidence: 94%

“…Particularly strong discrepancies have been reported for the overall fission time derived from atomic technique experiments (e.g. [24,25,26,27]) and from kinematical measurements [18], which are further emphasized in the recent study [300]. Experimental signatures that are sensitive to the dissipation on a specific stage of the fission process, for example pre-saddle effects, are particularly interesting.…”

Section: Nuclear Dissipation From Inverse-kinematics Experimentsmentioning

confidence: 97%

“…[24], where the much longer fission times were deduced. The authors of [18] strongly emphasized this discrepancy and called for further efforts to clarify this issue, which could be very important for the synthesis of new superheavy eleements, see also the recent study [300]. Prompt-fission-neutron multiplicities.…”

Section: 52mentioning

confidence: 99%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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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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“…claimed by the work [477]. However, the recent investigation [300] questioned whether the sensitivity argument can explain this discrepancy.…”

Section: Dissipation and Time Scales In Fissionmentioning

confidence: 94%

Section: Nuclear Dissipation From Inverse-kinematics Experimentsmentioning

confidence: 97%

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Nuclear fission: a review of experimental advances and phenomenology

2017

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“…The different measured fission timescales have been attributed to the sensitivity of the nuclear technique to short timescale and that of atomic technique to long timescale and it was argued that the long fission times could provide information about the viscosity [8] of the nuclear medium and might be used as a probe [4] for studying the long-lived superheavy nuclei. It was recently shown [9] that the observed long fission time for the majority of the fissioning events as obtained by the atomic techniques cannot be reconciled with the short fission time obtained by the nuclear techniques for any plausible fission time distribution. So it is very important to obtain evidence for long fission time by more direct means.…”

Section: Introductionmentioning

confidence: 97%

Direct observation of slow fission from the width of K x-ray line

et al. 2018

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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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“…Sikdar et al [10] have recently pointed out that there is a substantial discrepancy between the fission time scales measured with different "clocks" for the Z=120 system formed in the 64 Ni + 238 U reaction. The discrepancy is most pronounced between fission times obtained with so-called "atomic clocks", notably the crystal blocking technique and compound-nucleus X-ray emission, in relation to those obtained by "nuclear clocks" such as the rotation rate of the di-nuclear system, and the emission rate of evaporation neutrons and Giant Dipole Resonance (GDR) -rays.…”

Section: Introductionmentioning

confidence: 99%

Experimental Measures of Fission Time Scales

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2020

Proceedings of 13th International Conference on Nucleus-Nucleus Collisions

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The nuclear fission process involves a drastic rearrangement of the nuclear matter of the fissioning system as it undergoes dramatic shape changes from a single, compact nucleus to two separated fission fragments. Much research, both theoretical and experimental, has focused on understanding the dynamics of this process using a number of different approaches. Soon after the discovery of fission in 1938-39, Bohr and Wheeler proposed the transition state model in which the fission decay width / lifetime was obtained by the statistical counting of transition states at the fission barrier. Subsequently, Kramers suggested that the friction or viscosity of the nuclear matter can play a substantial role in slowing down the decay rate by large factors. Since then, many theoretical works have addressed this issue, most intensely during recent decades, but consensus on the dynamical description of fission has not yet been reached. In light of this situation, it is important to consider whether experiments can shed some light on the issue. Several different methods have been used to obtain experimental information on the dynamics of fission and the associated time scales for the process. In general, the approach is to compare the fission time to some other process that is believed to be better understood. Although the divergence of results obtained by the different methods has been known for years, these discrepancies have not yet been resolved and they have recently received renewed attention. In this talk, I will review some of the experimental measurements of fission time scales and discuss the discrepancies between the different methods.

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Examination of the fission time of theZ=120nucleus

Cited by 11 publications

References 19 publications

Nuclear fission: a review of experimental advances and phenomenology

Nuclear fission: a review of experimental advances and phenomenology

Direct observation of slow fission from the width of K x-ray line

Experimental Measures of Fission Time Scales

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