Approaching neutron-rich nuclei toward the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>r</mml:mi></mml:math>-process path in peripheral heavy-ion collisions at 15 MeV/nucleon

Souliotis, G. A.; Veselský, M.; Galanopoulos, S.; Jändel, M.; Kohley, Z.; May, L. W.; Shetty, D. V.; Stein, B. C.; Yennello, S. J.

doi:10.1103/physrevc.84.064607

Cited by 32 publications

(62 citation statements)

References 50 publications

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“…Concerning the choice of energy, our calculations, presented in the appendix, suggest that the energy of 15 MeV/nucleon is a reasonable choice for the efficient production of very neutron-rich isotopes close to the projectile. This conclusion is also in agreement with our pervious experimental [43] and theoretical [44] work. Since our calculations are complete event-by-event simulations, we can also study systematically the velocity distributions, the angular distributions and, the ionic charge state distributions of the projectile fragments.…”

Section: Discussion and Planssupporting

confidence: 93%

Neutron-rich rare isotope production with stable and radioactive beams in the mass range A ∼ 40–60 at beam energy around 15 MeV/nucleon

Papageorgiou¹,

Souliotis²,

Tshoo³

et al. 2018

J. Phys. G: Nucl. Part. Phys.

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We studied the production of neutron-rich nuclides in multinucleon transfer collisions of stable and radioactive beams in the mass range A∼40-60. We first presented our experimental cross section data of projectile fragments from the reaction of 40 Ar(15 MeV/nucleon) with 64 Ni, 58 Ni and 27 Al. We then compared them with calculations based on either the deep-inelastic transfer (DIT) model or the constrained molecular dynamics (CoMD) model, followed by the statistical multifragmentation model (SMM). An overall good agreement of the calculations with the experimental data is obtained. We continued with calculations of the reaction of 40 Ar (15 MeV/nucleon) with 238 U target and then with reactions of 48 Ca (15 MeV/nucleon) with 64 Ni and 238 U targets. In these reactions, neutron-rich rare isotopes with large cross sections are produced. These nuclides, in turn, can be assumed to form radioactive beams and interact with a subsequent target (preferably 238 U), leading to the production of extremely neutron-rich and even new isotopes (e.g. 60 Ca) in this mass range. We conclude that multinucleon transfer reactions with stable or radioactive beams at the energy of around 15 MeV/nucleon offer an effective route to access extremely neutron-rich rare isotopes for nuclear structure or reaction studies.

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Section: Discussion and Planssupporting

confidence: 93%

Neutron-rich rare isotope production with stable and radioactive beams in the mass range A ∼ 40–60 at beam energy around 15 MeV/nucleon

Papageorgiou¹,

Souliotis²,

Tshoo³

et al. 2018

J. Phys. G: Nucl. Part. Phys.

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“…We observed a satisfactory agreement between the data given in Ref. [9,12] and our results obtained within the SMM. As expected, we also demonstrated that neutron-rich sources provide more neutron-rich fragment production in the reactions near Coulomb barriers.…”

Section: Mass and Isotopic Distributions Of Fragmentssupporting

confidence: 89%

Isotopic distribution in projectile fragments above the Coulomb barrier

Kaya¹,

Buyukcizmeci²,

Ogul³

2018

Turk J Phys

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We have studied fragmentation properties of projectiles in peripheral heavy-ion collisions within a statistical ensemble approach. Distributions of projectile fragments are calculated for the reaction systems 86 Kr on 58,64 Ni and are compared to the experimental data for the same reactions at projectile energy of 15 MeV/nucleon. We assume that the projectile nuclei capture many neutrons from the targets as a result of the multinucleon transfer reactions (direct and fast reactions) at the first step of the dynamical stage of the collisions, and then the excited spectators are formed during the preequilibrium process (multistep reactions) long before the statistical equilibrium stage, and the deexcitation processes for the hot sources are simulated within the statistical multifragmentation model. It is seen that predicted results are in satisfactory agreement with experimental data.

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“…These fragmentation-type reactions have been previously shown to be well reproduced by molecular dynamics simulations [46]. At lower energies (15−25 MeV/nucleon), Souliotis et al has shown the CoMD simulation to accurately reproduce the properties of residues produced from binary deep-inelastic transfer reactions [47,48].…”

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confidence: 91%

Exploiting neutron-rich radioactive ion beams to constrain the symmetry energy

et al. 2013

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The Modular Neutron Array (MoNA) and 4 Tm Sweeper magnet were used to measure the free neutrons and heavy charged particles from the radioactive ion beam induced 32 Mg + 9 Be reaction. The fragmentation reaction was simulated with the constrained molecular dynamics model (CoMD), which demonstrated that the N/Z of the heavy fragments and free neutron multiplicities were observables sensitive to the density dependence of the symmetry energy at subsaturation densities. Through comparison of these simulations with the experimental data, constraints on the density dependence of the symmetry energy were extracted. The advantage of radioactive ion beams as a probe of the symmetry energy is demonstrated through examination of CoMD calculations for stable and radioactive-beam-induced reactions. PACS number(s): 21.65. Mn, 25.70.Mn, 21.65.Ef Introduction. The desire to extend our understanding of nuclear matter at densities, temperatures, pressures, and neutron-to-proton ratios (N/Z) away from that of ground-state nuclei has become a driving force in the nuclear science community. In particular, the emergence of radioactive ion beam (RIB) facilities has placed an emphasis on exploring nuclear matter along the isospin degree of freedom. The symmetry energy is the critical component which defines how the properties of nuclear matter, or the nuclear equation of state (EoS), change as a function of isospin. The nuclear EoS can be approximated aswhere the energy per nucleon of infinite nuclear matter, E(ρ, δ), is a function of the density (ρ) and isospin concentration (δ) [1][2][3]. The isospin concentration is the difference in the neutron and proton densities, δ = (ρ n − ρ p )/(ρ n + ρ p ) ≈ (N − Z)/A. The first term of the EoS is isopin independent and thus represents the binding energy of symmetric (N = Z) nuclear matter. The second term of the EoS has a strong dependence on the asymmetry of the nuclear matter and has been historically termed the symmetry energy (however, a more appropriate term is the asymmetry energy). The EoS for symmetric nuclear matter is relatively well constrained around the saturation density (ρ 0 = 0.16 fm −3 ) from isoscalar giant monopole and dipole resonances [4,5] and at higher densities (up to ρ/ρ 0 ∼4.5) from heavy-ion collisions [6,7]. Constraining the form of the density dependence of the symmetry energy [E sym (ρ)] is essential for developing a complete description of asymmetric nuclear matter. For example, the properties of neutron stars are strongly correlated to the * kohley@nscl.msu.edu † Present address: TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada.

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Approaching neutron-rich nuclei toward ther-process path in peripheral heavy-ion collisions at 15 MeV/nucleon

Cited by 32 publications

References 50 publications

Neutron-rich rare isotope production with stable and radioactive beams in the mass range A ∼ 40–60 at beam energy around 15 MeV/nucleon

Neutron-rich rare isotope production with stable and radioactive beams in the mass range A ∼ 40–60 at beam energy around 15 MeV/nucleon

Isotopic distribution in projectile fragments above the Coulomb barrier

Exploiting neutron-rich radioactive ion beams to constrain the symmetry energy

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