In-beam fission study for Heavy Element Synthesis

Nishio, K.

doi:10.1051/epjconf/20136203001

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…(Color online) FFMDs for the reactions between five spherical projectiles and deformed 238 U target nuclei taken at four excitation energies, shown in each panel. Data are from [120,89,123,375]. The Zp×Zt value for each reaction is shown in brackets.…”

Section: Page 46 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

“…To investigate these phenomena, the JAEA group performed a series of experiments at their setup at the tandem (section 3.1.1) to measure FFMDs in the reactions between spherical 30 Si, 31 P, 34,36 S, 40 Ar, 40,48 Ca projectiles and a deformed 238 U target nucleus, leading to excited superheavy nuclei 268 Sg * , 269 Bh * , 272,274 Hs * , 278 Ds * , 278,286 Cn * [89,120,121,123,375]; the obtained results are summarized in figure 58. For each reaction, the data for four incident energies are 274 Hs plotted as a function of the elongation and mass asymmetry, taken from [120].…”

Section: Fusion-fission and Quasifission Phenomena In Heavy-ion-induc...mentioning

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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Section: Page 46 Of 77 Author Submitted Manuscript -Ropp-100800r2mentioning

confidence: 99%

Section: Fusion-fission and Quasifission Phenomena In Heavy-ion-induc...mentioning

confidence: 99%

Nuclear fission: a review of experimental advances and phenomenology

2017

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“…Projects to measure fission fragment properties for the heaviest elements (Z > 106) are underway at several heavy-ion facilities around the world. The SHE Factory of JINR-Dubna [1], which will produce its first intense beam in 2019, the HIAF+CUBE of ANU-Canberra [2] and the tandem accelerator of the JAEA-Tokai [3] are just few examples. In this context, theoretical calculations are very useful.…”

Section: Introductionmentioning

confidence: 99%

Fission of super-heavy nuclei: Fragment mass distributions and their dependence on excitation energy

Carjan¹,

Ivanyuk²,

Oganessian³

2019

Eurasian j. phys. funct. mater.

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The mass and total kinetic energy distributions of the fission fragments in the fission of eveneven isotopes of superheavy elements from Hs (Z=108) to Og (Z=118) are estimated using a prescission point model. We restrict to nuclei for which spontaneous fission has been experimentally observed. The potential energy surfaces are calculated with Strutinsky's shell correction procedure. The parametrization of the nuclear shapes is based on Cassini ovals. For the just before scission configuration we fix α=0.98, what corresponds to r neck ≈ 2 fm, and take into account another four deformation parameters: α1, α3, α4, α6. The fragment-mass distributions are estimated supposing they are due to thermal fluctuations in the mass asymmetry degree of freedom just before scission. The influence of the excitation energy of the fissioning system on these distributions is studied. The distributions of the total kinetic energy (TKE) of the fragments are also calculated (in the pointcharge approximation). In Hs, Ds and Cn isotopes a transition from symmetric to asymmetric fission is predicted with increasing neutron number N (at N≈168). Super-symmetric fission occurs at N≈160. When the excitation energy increases from 0 to 30 MeV, the peaks (one or two) of the mass distributions become only slightly wider. The first two moments of the TKE distributions are displayed as a function of the mass number A of the fissioning nucleus. A slow decrease of the average energy and a minimum of the width (at N≈162) is found.

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