Charged particle-induced nuclear fission reactions – Progress and prospects

Kailas, S.; Mahata, K.

doi:10.1007/s12043-014-0871-x

Cited by 11 publications

(12 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accurate knowledge of the fission barrier height is vital not only to understand the heavy-ion induced fusion-fission dynamics and predictions concerning super-heavy nuclei, but also other areas, such as stellar nucleosynthesis and nuclear energy applications. The status of charged particle induced fission reactions has been reviewed recently [2] Experimental determination of the fission barrier height in mass A ∼ 200 continues to be a challenging problem. In this mass region, the fission barrier heights are much higher than the neutron separation energies and experimental cross sections around the fission barrier, being extremely low, are often not available.…”

mentioning

confidence: 99%

Fission barrier, damping of shell correction, and neutron emission in the fission ofA∼200

2015

View full text Add to dashboard Cite

Decay of210 Po compound nucleus formed in light and heavy-ion induced fusion reactions has been analyzed simultaneously using a consistent prescription for fission barrier and nuclear level density incorporating shell correction and its damping with excitation energy. Good description of all the excitation functions have been achieved with a fission barrier of 21.9 ± 0.2 MeV. For this barrier height, the predicted statistical pre-fission neutrons in heavy-ion fusion-fission are much smaller than the experimental values, implying the presence of dynamical neutrons due to dissipation even at these low excitation energies (∼ 50 MeV) in the mass region A ∼ 200. When only heavy-ion induced fission excitation functions and the pre-fission neutron multiplicities are included in the fits, the deduced best fit fission barrier depends on the assumed fission delay time during which dynamical neutrons can be emitted. A fission delay of (0.8 ± 0.1 )×10−19 s has been estimated corresponding to the above fission barrier height assuming that the entire excess neutrons over and above the statistical model predictions are due to the dynamics. The present observation has implication on the study of fission time scale/ nuclear viscosity using neutron emission as a probe.The fission process involves most drastic rearrangements in nuclei, where both statistical and dynamical features, governed by the delicate interplay between the macroscopic (liquid drop) aspects and the quantal (shell) effects, are exhibited. One of the key questions in nuclear fission is: what is the maximum energy along the fission path (barrier height) [1]? The fission barrier has contributions from the macroscopic liquid drop part as well as from the microscopic shell effects. Accurate knowledge of the fission barrier height is vital not only to understand the heavy-ion induced fusion-fission dynamics and predictions concerning super-heavy nuclei, but also other areas, such as stellar nucleosynthesis and nuclear energy applications. The status of charged particle induced fission reactions has been reviewed recently [2] Experimental determination of the fission barrier height in mass A ∼ 200 continues to be a challenging problem. In this mass region, the fission barrier heights are much higher than the neutron separation energies and experimental cross sections around the fission barrier, being extremely low, are often not available. Large ground state shell corrections around the Z=82, N=126 brings in additional parameters in the investigation of fission in mass A ∼ 200 region.As shown in Fig. 1, the mass of a nucleus gets lowered from the liquid drop (LD) ground state due to negative shell correction energy (∆ n ). Knowledge of the shell correction at the saddle deformation (∆ f ) for A∼200 is obscure and most of the analyses assume ∆ f = 0. The shell correction reduces with increasing excitation energy and washes out at excitation energy of around 30-40 MeV. * kmahata@barc.gov.in † Raja Ramanna Fellow ‡ INSA Honorary Scientist A clear manifestation of this is...

show abstract

mentioning

confidence: 99%

Fission barrier, damping of shell correction, and neutron emission in the fission ofA∼200

2015

View full text Add to dashboard Cite

show abstract

“…The approach is not fully microcanonical, since the driving force is determined by the derivative of the potential. Because dissipation is explicitly considered by the surface-pluswindow dissipation model, not only fission-fragment mass distributions, but also total kinetic energies are obtained for neutron-induced fission of 233,235 U and 239 Pu from thermal energy to a few MeV, as well as for spontaneous fission of 240 Pu and 252 Cf. Measured pre-neutron mass distributions are considerably well reproduced, while the kinetic energies of the fragments close to symmetry are overestimated.…”

Section: Selected Resultsmentioning

confidence: 99%

“…The easy accessibility of higher excitation energies and the inevitable population of larger angular momenta allow to study other aspects of the fission process. They are described in the recent review by Kailas and Mahata [233]. These are not covered in this work.…”

Section: Former Status Of Knowledgementioning

confidence: 97%

See 1 more Smart Citation

Review on the progress in nuclear fission

Schmidt,

Jurado

2018

Preprint

View full text Add to dashboard Cite

“…Several recent reviews discussed some of the fission aspects, studied in reactions with charged particles and in the traditional regions of fission in transactinide and superheavy nuclei, see e.g. [34,35,36]. The recent one by Heßberger [37] is specifically dedicated to spontaneous fission.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Nuclear fission: a review of experimental advances and phenomenology

2017

View full text Add to dashboard Cite

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.

show abstract

Charged particle-induced nuclear fission reactions – Progress and prospects

Cited by 11 publications

References 92 publications

Fission barrier, damping of shell correction, and neutron emission in the fission ofA∼200

Fission barrier, damping of shell correction, and neutron emission in the fission ofA∼200

Review on the progress in nuclear fission

Nuclear fission: a review of experimental advances and phenomenology

Contact Info

Product

Resources

About