Fusion enhancement at near and sub-barrier energies in 19O + 12C

Singh, Varinderjit; Vadas, J.; Steinbach, T.; Wiggins, B.B.; Hudan, S.; deSouza, Romualdo; Lin, Zidu; Horowitz, C. J.; Baby, L. T.; Kuvin, S. A.; Tripathi, Vandana; Wiedenhöver, I.; Umar, A. S.

doi:10.1016/j.physletb.2016.12.017

Cited by 26 publications

(13 citation statements)

References 20 publications

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“…In the same mass region, the reaction 20 O+ 12 C has been measured [138] and compared with DCTDHF calculations [139]. While for this system the calculations underestimate the fusion cross-sections, it is interesting to note that a good agreement is obtained for the 19 O+ 12 C system [140]. A poor agreement is obtained for the 18 O+ 12 C stable system [141].…”

Section: -8mentioning

confidence: 99%

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions

Simenel

Umar

2018

Progress in Particle and Nuclear Physics

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169

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Microscopic methods and tools to describe nuclear dynamics have considerably been improved in the past few years. They are based on the time-dependent Hartree-Fock (TDHF) theory and its extensions to include pairing correlations and quantum fluctuations. The TDHF theory is the lowest level of approximation of a range of methods to solve the quantum many-body problem, showing its universality to describe manyfermion dynamics at the mean-field level. The range of applications of TDHF to describe realistic systems allowing for detailed comparisons with experiment has considerably increased. For instance, TDHF is now commonly used to investigate fusion, multi-nucleon transfer and quasi-fission reactions. Thanks to the inclusion of pairing correlations, it has also recently led to breakthroughs in our description of the saddle to scission evolution, and, in particular, the non-adiabatic effects near scission. Beyond mean-field approaches such as the time-dependent random-phase approximation (TDRPA) and stochastic meanfield methods have reached the point where they can be used for realistic applications. We review recent progresses in both techniques and applications to heavy-ion collision and fission. Introduction: nuclear quantum many-body dynamicsThe quantum many-body problem is vital to many areas of physics. Indeed, the description of complex quantum objects of interacting particles is of interests for many physical systems, from quarks and gluons in a nucleon to macromolecules, such as fullerenes, to Bose-Einstein condensates. Consequently, major developments in the description of quantum many-body systems are often of interest to many different fields. For instance, the BCS theory introduced to describe superconductivity [1] is also widely used in nuclear physics to incorporate the effect of pairing correlations. Similarly, the tools used to study low-energy fusion with multi-channel tunneling [2] are also used to describe dissociative adsorption of molecules on a surface [3].The similarity between dynamical processes in quantum many-body systems, whether their constituents are nucleons, electrons, or atoms, is quite striking. It is possible to make such systems vibrate, rotate, fuse, transfer particles, fission and break up. This is of course true for nuclear systems, where each of these processes can be used to learn about specific aspects of quantum many-body dynamics. For instance, the study of nuclear vibrations tells us how single-particles can produce collective motion, what is its interplay with the underlying shell structure, what are the source of non-linearities leading to anharmonicities, and how collective modes get damped and decay. These concepts and many others can also be studied via heavy-ion collisions:1 In the case of a time-independent Hamiltonian, we haveF H (t) = e iĤt/ F e −iĤt/ . 2 Of course, nucleons are indistinguishable fermions and there is no guarantee that the nucleon which is annihilated is the same as the one which is created. In fact, the question of "which one" is created or a...

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Section: -8mentioning

confidence: 99%

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions

Simenel

Umar

2018

Progress in Particle and Nuclear Physics

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169

103

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“…As nuclei become more neutron-rich their properties are expected to change and new collective modes may emerge. The availability of neutron-rich beams at radioactive beam facilities now allows the systematic exploration of fusion for an isotopic chain of neutron-rich nuclei [2][3][4][5][6]. While the next generation of radioactive beam facilities, such as the Facility for Rare Isotope Beams (FRIB), will provide radioactive beams closer to the neutron drip-line than ever before [7], it also presents experimental challenges.…”

Section: Introductionmentioning

confidence: 99%

MuSIC@Indiana: an effective tool for accurate measurement of fusion with low-intensity radioactive beams

Johnstone,

Kumar,

Hudan

et al. 2021

Preprint

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The design, construction, and characterization of the Multi-Sampling Ionization Chamber, MuSIC@Indiana, are described. This detector provides efficient and accurate measurement of the fusion cross-section at near-barrier energies. The response of the detector to low-intensity beams of 17,18 O, 19 F, 23 Na, 24,26 Mg, 27 Al, and 28 Si at E lab = 50-60 MeV was examined. MuSIC@Indiana was commissioned by measuring the 18 O+ 12 C fusion excitation function for 11 < E cm < 20 MeV using CH 4 gas. A simple, effective analysis cleanly distinguishes proton capture and two-body scattering events from fusion on carbon. With MuSIC@Indiana, measurement of 15 points on the excitation function for a single incident beam energy is achieved. The resulting excitation function is shown to be in good agreement with literature data.

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“…In addition, it would help guiding experimental programs aiming at studying the impact of exotic structures (e.g., neutron-skins and pigmy dipole resonances) and of the continuum on fusion (see Refs. [6][7][8] and contributions from D. Bazin, J. Kolata, R. T. de Souza and G. Colucci for new or recent experimental programs).…”

Section: Introductionmentioning

confidence: 99%

Effect of Pauli repulsion and transfer on fusion

et al. 2017

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Abstract. The e↵ect of the Pauli exclusion principle on the nucleus-nucleus bare potential is studied using a new density-constrained extension of the Frozen-Hartree-Fock (DCFHF) technique. The resulting potentials exhibit a repulsion at short distance. The charge product dependence of this Pauli repulsion is investigated. Dynamical e↵ects are then included in the potential with the density-constrained time-dependent Hartree-Fock (DCTDHF) method. In particular, isovector contributions to this potential are used to investigate the role of transfer on fusion, resulting in a lowering of the inner part of the potential for systems with positive Q-value transfer channels.

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Fusion enhancement at near and sub-barrier energies in 19O + 12C

Cited by 26 publications

References 20 publications

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions

MuSIC@Indiana: an effective tool for accurate measurement of fusion with low-intensity radioactive beams

Effect of Pauli repulsion and transfer on fusion

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