Astrophysics experiments with radioactive beams at ATLAS

Back, B. B.; Clark, J. A.; Pardo, R. C.; Rehm, K.E.; Savard, G.

doi:10.1063/1.4865588

Cited by 11 publications

(10 citation statements)

References 80 publications

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“…[174]. In particular we would like to mention, because of its peculiarity, the project CARIBU (CAlifornium Rare Isotope Breeder Upgrade) that presently is under development at ANL [175]. Indeed, its originality relies in the fact that no primary accelerator is employed, rather, the short-lived neutron-rich isotopes will be produced by a 1 Ci 252 Cf fission source located in a large gas catcher.…”

Section: B Facilities and Experimental Set-upsmentioning

confidence: 99%

Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Montagnoli

Stefanini

2017

Eur. Phys. J. A

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Recent advances obtained in the field of near and sub-barrier heavy-ion fusion reactions are reviewed. Emphasis is given to the results obtained in the last decade, and focus will be mainly on the experimental work performed concerning the influence of transfer channels on fusion cross sections and the hindrance phenomenon far below the barrier. Indeed, early data of sub-barrier fusion taught us that cross sections may strongly depend on the low-energy collective modes of the colliding nuclei, and, possibly, on couplings to transfer channels. The coupled-channels (CC) model has been quite successful in the interpretation of the experimental evidences. Fusion barrier distributions often yield the fingerprint of the relevant coupled channels. Recent results obtained by using radioactive beams are reported. At deep sub-barrier energies, the slope of the excitation function in a semilogarithmic plot keeps increasing in many cases and standard CC calculations overpredict the cross sections. This was named a hindrance phenomenon, and its physical origin is still a matter of debate. Recent theoretical developments suggest that this effect, at least partially, may be a consequence of the Pauli exclusion principle. The hindrance may have far-reaching consequences in astrophysics where fusion of light systems determines stellar evolution during the carbon and oxygen burning stages, and yields important information for exotic reactions that take place in the inner crust of accreting neutron stars.

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Section: B Facilities and Experimental Set-upsmentioning

confidence: 99%

Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Montagnoli

Stefanini

2017

Eur. Phys. J. A

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“…The resultant cross sections differ significantly from those obtained when the states in the coupled channel calculations are taken to have zero width, and compound-system resonances are better matched to observed values. The advent of radioactive ion beams has allowed exploration of nuclei far from the valley of stability, and has led to an immense experimental effort [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. Theoretical studies of these systems is vital for interpretation of the resultant data.…”

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confidence: 99%

“…(1) (and from those later given) are shown in Figs. 1 and 2; the first presents spectra of 9 Be as an n+ 8 Be cluster and the second a set of total elastic and reaction cross sections in the energy range to just over 5 MeV. 8 Be was treated as a rotor with quadrupole deformation and three states of it, 0 + g.s.…”

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confidence: 99%

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Importance of resonance widths in low-energy scattering of weakly bound light-mass nuclei

et al. 2016

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What effect do particle-emitting resonances have on the scattering cross section? What physical considerations are necessary when modelling these resonances? These questions are important when theoretically describing scattering experiments with radioactive ion beams which investigate the frontiers of the table of nuclides, far from stability. Herein, a novel method is developed that describes resonant nuclear scattering from which centroids and widths in the compound nucleus are obtained when one of the interacting bodies has particle unstable resonances. The method gives cross sections without unphysical behavior that is found if simple Lorentzian forms are used to describe resonant target states. The resultant cross sections differ significantly from those obtained when the states in the coupled channel calculations are taken to have zero width, and compound-system resonances are better matched to observed values.

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“…Starrfield 15 demonstrates that white dwarves in binary systems, the progenitors of novae, are increasing in mass. Ongoing work at the TRIUMF laboratory in Canada is detailed by Davids 16 and upgrades to the ATLAS facility at Argonne described by Rehm et al, 17 while Moon 18 discusses the new laboratory for nuclear physics in Korea. Descouvemont et al 19 explains the use of few-body theoretical models in generating nuclear reaction rates for astrophysics, while Rauscher describes the challenges inherent in determining theoretical rates for elements heavier than iron.…”

Section: The Issuementioning

confidence: 99%

Preface to Special Topic: Stardust: Progress and Problems in Nuclear Astrophysics

Bertolli

Chipps

2014

AIP Advances

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I. THE PROBLEMSir Frederick Hoyle is widely considered to be one of the founders of the field of nuclear astrophysics. Being well acquainted with both nuclear physics and astrophysics, he was one of the first to bridge the gap, and, with others such as Gamow, Eddington, and Fowler, sought to provide answers to the questions of how the elements were generated and what powered stars like the Sun.Hoyle, together with Fowler and the Burbidges, worked out a feasible and robust theory of nucleosynthesis: a process by which all of the naturally-occurring elements could be created. Successive captures of protons, neutrons, and alpha particles, along with subsequent beta, gamma, and particle decays, proved capable of stepping up through the nuclear chart. Even while details of the astrophysical context for nucleosynthesis were still debated, the process was clear, and clearly fell into its own new category: nuclear astrophysics. Hoyle's scenario remains, to this day, the broad picture depicting the evolution of stars and the elements within them.But, somewhat surprisingly, Hoyle's key paper on the development of the theory of stellar nucleosynthesis, which preceded the now-famous B2FH 1 publication by several years, "received relatively little attention at the time, perhaps because it was published in a new astrophysical journal 2 that was relatively unknown to the nuclear physics community". 3 That bears stating once more: the first introduction of Hoyle's nucleosynthesis mechanism went largely unnoticed in nuclear physics because it was published in an astrophysics journal.One can wonder how the history of the field of nuclear astrophysics would have played out differently, had a single journal been available to researchers working in both fields. There are still many important questions in nuclear astrophysics which remain unanswered, potentially because the communication between nuclear physics and astrophysics is still as difficult as in Hoyle's day.

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Astrophysics experiments with radioactive beams at ATLAS

Cited by 11 publications

References 80 publications

Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Importance of resonance widths in low-energy scattering of weakly bound light-mass nuclei

Preface to Special Topic: Stardust: Progress and Problems in Nuclear Astrophysics

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