E. C. Simpson
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View article: Quantitatively relating multinucleon transfer and fusion
Quantitatively relating multinucleon transfer and fusion Open
Above-barrier capture cross-sections for heavy ion-fusion are systematically lower than predictions, with the discrepancy rapidly growing with increasing charge product of the colliding nuclei. It has been proposed that this can be explain…
View article: Universality of shell effects in fusion-fission mass distributions
Universality of shell effects in fusion-fission mass distributions Open
We present the results of a broad, systematic study of heavy-ion induced fission mass distributions for every even-Z compound nucleus (ZCN) from 144Gd to 212Th. We find systematic evidence of shell-driven structure in every fission mass di…
View article: Results of a Geant4 benchmarking study for bio‐medical applications, performed with the G4‐Med system
Results of a Geant4 benchmarking study for bio‐medical applications, performed with the G4‐Med system Open
Background Geant4, a Monte Carlo Simulation Toolkit extensively used in bio‐medical physics, is in continuous evolution to include newest research findings to improve its accuracy and to respond to the evolving needs of a very diverse user…
View article: Sequential fission and the influence of <sup>208</sup>Pb closed shells on the dynamics of superheavy element synthesis reactions
Sequential fission and the influence of <sup>208</sup>Pb closed shells on the dynamics of superheavy element synthesis reactions Open
Measured binary quasifission mass spectra in reactions with actinide nuclides show a large peak in yield near the doubly-magic 208 Pb, generally attributed to enhanced binding energy causing a valley in the potential energy surface, which …
View article: Observation of suppression of heavy-ion fusion by slow quasifission
Observation of suppression of heavy-ion fusion by slow quasifission Open
The formation of superheavy elements (SHEs) by nuclear fusion can be conceptually divided into two steps: capture, and compound nucleus formation. Once captured, the two nuclei may reseparate before fusing to form a compact compound nucleu…
View article: Interplay of breakup and fusion in near-barrier collisions of weakly-bound nuclides
Interplay of breakup and fusion in near-barrier collisions of weakly-bound nuclides Open
Light, weakly-bound nuclides such as 6,7 Li and 9 Be exhibit a diverse range of near-barrier reaction phenomena. Complete fusion is found to be suppressed by up to 35% with respect to barrier-passing model calculations. Their weak binding …
View article: Sequential fission and the influence of 208Pb closed shells on the dynamics of superheavy element synthesis reactions
Sequential fission and the influence of 208Pb closed shells on the dynamics of superheavy element synthesis reactions Open
Measured binary quasifission mass spectra in reactions with actinide nuclides show a large peak in yield near the doubly-magic 208Pb. This has generally been attributed to the enhanced binding energy of 208Pb causing a valley in the potent…
View article: Energy dissipation and suppression of capture cross sections in heavy ion reactions
Energy dissipation and suppression of capture cross sections in heavy ion reactions Open
Background: At energies above the capture barrier, coupled-channels (CC) calculations with a standard nuclear potential diffuseness (0.65 fm) increasingly overestimate experimental capture cross section as the charge product (Z1Z2) of the …
View article: Dealing with contaminants in Coulomb excitation of radioactive beams
Dealing with contaminants in Coulomb excitation of radioactive beams Open
Data analysis of the Coulomb excitation experiment of the exotic 206 Hg nucleus, recently performed at CERN’s HIE-ISOLDE facility, needs to account for the contribution to target excitation due to the strongly-present beam contaminant 130 …
View article: The 3D Nuclide Chart
The 3D Nuclide Chart Open
We present an overview of The 3D Nuclide Chart , a new online nuclide chart designed for producing high quality 3D nuclide chart images for use in publications, presentations, education and outreach. An historical overview of the design of…
View article: <sup>208</sup>Po populated through EC/β<sup>+</sup> decay
<sup>208</sup>Po populated through EC/β<sup>+</sup> decay Open
The structure of 208Po resulting from the EC/β + decay of 208At was studied at
\nCERN’s ISOLDE Decay Station (IDS). The high statistics afforded by the high yield of 208At and the high efficiency HPGe clusters at the IDS allowed for greate…
View article: Nuclear reaction cross sections for hadron therapy
Nuclear reaction cross sections for hadron therapy Open
Treatment planning in hadron therapy uses Monte Carlo techniques that require total nuclear reaction cross sections for a variety of interacting systems and over a wide range of energies. Current empirical models are tuned to reproduce cro…
View article: Improved precision on the experimental E0 decay branching ratio of the Hoyle state
Improved precision on the experimental E0 decay branching ratio of the Hoyle state Open
Stellar carbon synthesis occurs exclusively via the $3α$ process, in which three $α$ particles fuse to form $^{12}$C in the excited Hoyle state, followed by electromagnetic decay to the ground state. The Hoyle state is above the $α$ thresh…
View article: Zeptosecond contact times for element Z=120 synthesis
Zeptosecond contact times for element Z=120 synthesis Open
The synthesis of new superheavy elements beyond oganesson (Z=118) requires fusion reactions with projectile nuclei with proton numbers larger than that of 48Ca (Z=20), which has been successfully employed for the synthesis of elements with…
View article: Report on G4‐Med, a Geant4 benchmarking system for medical physics applications developed by the Geant4 Medical Simulation Benchmarking Group
Report on G4‐Med, a Geant4 benchmarking system for medical physics applications developed by the Geant4 Medical Simulation Benchmarking Group Open
Background Geant4 is a Monte Carlo code extensively used in medical physics for a wide range of applications, such as dosimetry, micro‐ and nanodosimetry, imaging, radiation protection, and nuclear medicine. Geant4 is continuously evolving…
View article: External beam for the Heavy Ion Accelerator Facility
External beam for the Heavy Ion Accelerator Facility Open
Radiotherapy using protons and heavier ions is emerging as an alternative to traditional photon radiotherapy for cancer treatment. Ions have a depth-dose profile that results in high energy deposition at the end of the particle’s path, wit…
View article: Systematic Study of Quasifission in <sup>48</sup>Ca-induced reactions
Systematic Study of Quasifission in <sup>48</sup>Ca-induced reactions Open
The production of superheavy elements through the fusion of two heavy nuclei is severely hindered by the quasifission process, which results in the fission of heavy systems before an equilibrated compound nucleus (CN) can be formed. The he…
View article: Elastic Scattering and Reaction Cross-section of <sup>8</sup>Li on <sup>209</sup>Bi
Elastic Scattering and Reaction Cross-section of <sup>8</sup>Li on <sup>209</sup>Bi Open
Nuclear physics in the 21 st century is driven by a quest to understand the properties of ever more exotic nuclear systems. Unusual structural phenom- ena are observed to arise in light weakly bound nuclei such as 8 Li. 8 Li has a cluster …
View article: Measuring precise fusion cross sections using an 8T superconducting solenoid
Measuring precise fusion cross sections using an 8T superconducting solenoid Open
A novel fusion-evaporation residue separator based on a gas-filled superconducting solenoid has been developed at the Australian National University. Though the transmission efficiency of the solenoid is very high, precision cross sections…