Erratum: Systematic behavior of mass distributions in 
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-induced fission at near-barrier energies [Phys. Rev. C 
<b>85</b>
, 014611 (2012)]

Lin, C. J.; Rietz, R. du; Hinde, D. J.; Dasgupta, M.; Thomas, Ralph H.; Brown, Michael L.; Evers, M.; Gasques, L. R.; Rodríguez, Matías

doi:10.1103/physrevc.96.029901

Cited by 9 publications

(18 citation statements)

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“…Here it is well-known that only collisions with the tips of deformed nuclei lead to capture [23], and that fission angular distributions [6], mass distributions [4,15,24] and MAD [5,17] point to the changing nature (shorter sticking time) of quasifission under these circumstances. Extensive microscopic TDHF calculations of the outgoing masses and angles of binary events have shown a good match [17] to the experimental MAD, and thus to sticking times and mass evolution in the reaction 40 Ca+ 238 U.…”

Section: Mass-angle Distributionsmentioning

confidence: 99%

“…To define the smooth trends in quasifission, a large number of MAD measurements have been selected from measurements recently made at the ANU [3][4][5][11][12][13][14][15][16][17]. By investigating empirically those nuclear stucture variables that affect quasifission, the ultimate goal to have a reliable predictive model of quasifission, including all relevant physics, will be a step closer.…”

Section: Mass-angle Distributionsmentioning

confidence: 99%

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Nuclear structure effects in quasifission – understanding the formation of the heaviest elements

et al. 2016

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Abstract. Quasifission is an important process suppressing the fusion of two heavy nuclei in reactions used to create superheavy elements. Quasifission results in rapid separation of the dinuclear system initially formed at contact. Achieving reliable a priori prediction of quasifission probabilities is a very difficult problem. Through measurements with projectiles from C to Ni, the Australian National University's Heavy Ion Accelerator Facility and CUBE spectrometer have been used to map out mass-angle distributions (MAD) -the fission mass-ratio as a function of centre-of-mass angle. These provide information on quasifission dynamics in the least modeldependent way. Average quasifission time-scales have been extracted, and compared with TDHF calculations of the collisions, with good agreement being found. With the baseline information from the survey of experimental MAD, strong influences of the nuclear structure of the projectile and target nuclei can be clearly determined.

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Section: Mass-angle Distributionsmentioning

confidence: 99%

Section: Mass-angle Distributionsmentioning

confidence: 99%

Nuclear structure effects in quasifission – understanding the formation of the heaviest elements

et al. 2016

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“…The story is very different at sub-barrier energies. Here it is wellknown that collisions with the tips of deformed nuclei are those that lead to capture [4], and that fission angular distributions [17], mass distributions [10,13,25] and MAD [11,16] point to the changing nature (shorter sticking time) of quasifission under these circumstances. Microscopic TDHF calculations of quasifission masses and angles give a good match [16] to experimental results in reaction 40 Ca+ 238 U, across the transition from sub-barrier to above-barrier energies (at which all collision orientations contribute).…”

Section: Introductionmentioning

confidence: 99%

“…Quasifission mass-angle distributions (MAD) first measured at GSI in the 1980s [2,5] showed that quasifission timescales could often be shorter than the rotation time of ∼10 −20 s. However, subsequently only a few measurements [6,7] were made until recent years, when an extensive series of experiments (using the Australian National University Heavy Ion Accelerator Facility and CUBE spectrometer) were carried out [3,[8][9][10][11][12][13][14][15][16]. The kinematic coincidence technique used in the measurements [2,3,17] provides direct information on the mass-ratio of the fragments at scission; thus, the data are represented in terms of mass ratio M R , rather than pre-or According to the characteristics of the MAD (minimum mass yield at symmetry, mass-angle correlation with peak yield at symmetry, and no significant mass-angle correlation), they are assigned as type MAD1, MAD2 and MAD3 respectively [3].…”

Section: Introductionmentioning

confidence: 99%

Systematic study of quasifission characteristics and timescales in heavy element formation reactions

Hinde

Williams

Mohanto

et al. 2016

EPJ Web of Conferences

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Superheavy elements can only be created in the laboratory by the fusion of two massive nuclei. Mass-angle distributions give the most direct information on the characteristics and time scales of quasifission, the major competitor to fusion in these reactions. The systematics of 42 mass-angle distributions provide information on the global characteristics of quasifission. Deviations from the systematics reveal the major role played by the nuclear structure of the two colliding nuclei in determining the reaction outcome, and in hindering or favouring heavy element production.To form very heavy and superheavy elements (SHE), heavy-ion fusion reactions are used. Their cross sections can be significantly suppressed [1] by quasifission [2]. This dynamical non-equilibrium process results when the combined system formed after capture separates into two (fission-like) fragments in times ∼10 −20 s, before a compact compound nucleus is formed. The probability of quasifission (P QF ) can be very large, with the corresponding probability of compound nucleus formation (P CN = 1 -P QF ) being lower than 10 −3 in unfavourable cases. Understanding the competition between quasifission and fusion is thus very important in predicting the best fusion reactions to use to form new isotopes of heavy and super-heavy elements.A key quantity characterizing quasifission is its "sticking time" between capture of the two nuclei inside the entrance channel potential barrier [4] and breakup (scission). Quasifission mass-angle distributions (MAD) first measured at GSI in the 1980s [2,5] showed that quasifission timescales could often be shorter than the rotation time of ∼10 −20 s. However, subsequently only a few measurements [6,7] were made until recent years, when an extensive series of experiments (using the Australian National University Heavy Ion Accelerator Facility and CUBE spectrometer) were carried out [3,[8][9][10][11][12][13][14][15][16]. The kinematic coincidence technique used in the measurements [2,3,17] provides direct information on the mass-ratio of the fragments at scission; thus, the data are represented in terms of mass ratio M R , rather than pre-or According to the characteristics of the MAD (minimum mass yield at symmetry, mass-angle correlation with peak yield at symmetry, and no significant mass-angle correlation), they are assigned as type MAD1, MAD2 and MAD3 respectively [3]. There is a clear correlation between the MAD class and the entrance channel charge product. Other entrance channel characteristics are important in determining the sticking times and MAD characteristics, including neutron richness [14,18], and shell structure including static deformation [11] and magic numbers [14].To improve our quantitative understanding of the role of shell structure in the dynamics of quasifission, we make an analogy with the liquid drop model approach to nuclear masses, in which localized shell effects can be quantified when the underlying smooth (liquid drop) trends are well defined. To define the smooth trends in ...

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“…The existing systematic study shows that the width of mass distribution for the quasi-fission is larger than that for the fusion-fission [22]. Therefore an increased mass width can be used as an indicator for the presence of quasi-fission.…”

Section: Mass Distributionsmentioning

confidence: 99%

Near-barrier Fusion Evaporation and Fission of ²⁸Si+¹⁷⁴Yb and ³²S+¹⁷⁰Er

et al. 2017

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Abstract. Fusion evaporation residues and fission fragments have been measured, respectively, at energies around the Coulomb barrier for the 28 Si+ 174 Yb and 32 S+ 170 Er systems forming the same compound nucleus 202 Po. The excitation function of fusion evaporation, fission as well as capture reactions were deduced. Coupled-channels analyses reveal that couplings to the deformations of targets and the two-phonon states of projectiles contribute much to the enhancement of capture cross sections at sub-barrier energies. The mass and total kinetic energy of fission fragments were deduced by the time-difference method assuming full momentum transfer in a two-body kinematics. The mass-energy and mass-angle distributions were obtained and no obvious quasi-fission components were observed in this bombarding energy range. Further, mass distributions of fission fragments were fitted to extract their widths. Results show that the mass widths decrease monotonically with decreasing energy, but might start to increase when E c.m. /V B < 0.95 for both systems.

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Erratum: Systematic behavior of mass distributions in Ti48 -induced fission at near-barrier energies [Phys. Rev. C 85 , 014611 (2012)]

Cited by 9 publications

References 0 publications

Nuclear structure effects in quasifission – understanding the formation of the heaviest elements

Nuclear structure effects in quasifission – understanding the formation of the heaviest elements

Systematic study of quasifission characteristics and timescales in heavy element formation reactions

Near-barrier Fusion Evaporation and Fission of ²⁸Si+¹⁷⁴Yb and ³²S+¹⁷⁰Er

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Erratum: Systematic behavior of mass distributions in Ti48 -induced fission at near-barrier energies [Phys. Rev. C 85 , 014611 (2012)]

Cited by 9 publications

References 0 publications

Nuclear structure effects in quasifission – understanding the formation of the heaviest elements

Nuclear structure effects in quasifission – understanding the formation of the heaviest elements

Systematic study of quasifission characteristics and timescales in heavy element formation reactions

Near-barrier Fusion Evaporation and Fission of 28Si+174Yb and 32S+170Er

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Product

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Near-barrier Fusion Evaporation and Fission of ²⁸Si+¹⁷⁴Yb and ³²S+¹⁷⁰Er