A bargain at twice the price

Thompson, William J.

doi:10.1063/1.4823172

Cited by 63 publications

(91 citation statements)

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“…We reproduce the calculations of Ref. [9], using the code fresco [12], within the same model space for the CDCC calculations, keeping the same optical potentials, and the same single particle parameters for the s-and d-waves, but with our modified interaction for the bound state, p-and f-waves in the continuum. We chose the Pb target as an example and performed the calculations at both 44 MeV/A (Fig.…”

Section: Fig 1: Capture Cross Section Formentioning

confidence: 99%

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Sensitivity of⁸B breakup cross section to projectile structure in CDCC calculations

Summers¹,

Nunes²

2005

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

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Given the Astrophysical interest of7 Be(p, γ) 8 B, there have been several experiments applying the Coulomb dissociation method for extracting the capture rate. Measurements at Michigan State are dominated by E1 contributions but have a small E2 component. On the other hand, a lower energy measurement at Notre Dame has a much stronger E2 contribution. The expectation was that the two measurements would tie down the E2 and thus allow for an accurate extraction of the E1 relevant for the capture process. The aim of this brief report is to show that the E2 factor in breakup reactions does not translate into a scaling of the E2 contribution in the corresponding capture reaction. We show that changes to the 8 B single particle parameters, which are directly related to the E2 component in the capture reaction, do not effect the corresponding breakup reactions, using the present reaction theory.PACS numbers: 24.10. Eq, 25.60.Gc, 25.70.De, 27.20.+n Breakup reactions are one of the best probes to study nuclei on the dripline. The loosely bound nature of the nuclear systems imply that the continuum plays a very important role in the reaction mechanism. In the past few years, the Continuum Discretized Coupled Channel method [1] has been successfully applied to exotic nuclei. This method is fully quantum mechanical and is nonperturbative: it includes the couplings to breakup states to all orders. The projectile is treated as a core + N system which means that one of the main inputs to the model is the Hamiltonian of the projectile generating both bound and scattering states. In order to be able to treat continuum-continuum couplings, the scattering states are bunched into energy bins. Apart from the core + N interaction, the CDCC method also requires the optical potentials for core + target and N + target which are typically well known.One of the first applications of CDCC to dripline nuclei involved the description of the breakup of Be which means that the data contains both breakup (which is also referred to as diffraction) and stripping.However it was shown [6] that stripping only contributes for larger angles. The CDCC calculations performed make predictions for breakup only. Therefore our discussion will focus on the smaller angles only.Another experiment at MSU measured the breakup of 8 B on Au and Pb at 40-80 MeV/A [7,8]. Amongst other observables, detailed momentum distributions for 7 Be were extracted. CDCC calculations for these data were performed in [9]. Starting with the same 7 Be+p interaction as in [2], results show that good agreement with the data for the various angular sets and both targets can only be obtained if the quadrupole excitation couplings are artificially increased by a factor of 1.6.In this brief report we wish to highlight the differences between the quadrupole strength of higher-order reaction theory and the E2 capture strength of the astrophysically relevant inverse reaction. We will examine how the 1.6 factor from Ref. [9] translates into the E2 component of 7 Be(p, γ) 8 B. For this pur...

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Section: Fig 1: Capture Cross Section Formentioning

confidence: 99%

“…We compare it with the previous results, where no artificial increase is imposed. The coupled channel code fresco [12] was used. The resulting energy distributions are presented in Fig.…”

Section: Fig 1: Capture Cross Section Formentioning

confidence: 99%

Sensitivity of⁸B breakup cross section to projectile structure in CDCC calculations

Summers¹,

Nunes²

2005

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

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“…This model has been successfully used in previous CDCC calculations in collisions of 6 Li projectiles [12,13]. The numerical calculations were performed using the computer code FRESCO [14]. In the cluster model, the projectilenucleus interaction is written as…”

Section: Cdcc Calculationsmentioning

confidence: 99%

Nuclear and Coulomb breakup of the weakly bound6Li nucleus with targets in the range fromA=59to 208

et al. 2013

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We have performed CDCC calculations for the 6 Li + 59 Co, 144 Sm and 208 Pb systems, to investigate the dependence of the relative importance of nuclear and Coulomb breakup on the target charge (mass) at near barrier energies. The calculations were in good agreement with the experimental elastic scattering angular distributions for these systems and then, their predictions to the nuclear, Coulomb and total breakup were investigated. Although the relative importance of the nuclear breakup is, as expected, larger for lighter targets, this effect is not very pronounced. We also investigate a scaling of the nuclear breakup with the target mass and we compare the predictions for the integrated total breakup cross sections with experimental fusion cross sections at similar energies.

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“…Resonant states of the projectile are explicitly taken into account, to avoid double counting. In all calculations of the present work, we performed our numerical calculations using the code FRESCO [21].…”

Section: The Cdcc Modelmentioning

confidence: 99%

Theoretical study of the elastic breakup of weakly bound nuclei at near-barrier energies

et al. 2015

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We have performed CDCC calculations for collisions of 7 Li projectiles on 59 Co, 144 Sm and 208 Pb targets at near-barrier energies, to assess the importance of the Coulomb and the nuclear couplings in the breakup of 7 Li, as well as the Coulomb-nuclear interference. We have also investigated scaling laws, expressing the dependence of the cross sections on the charge and the mass of the target. This work is complementary to the one previously reported by us on the breakup of 6 Li. Here we explore the similarities and differences between the results for the two Lithium isotopes. The relevance of the Coulomb dipole strength at low energy for the two-cluster projectile is investigated in details.

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A bargain at twice the price

Cited by 63 publications

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Sensitivity of⁸B breakup cross section to projectile structure in CDCC calculations

Sensitivity of⁸B breakup cross section to projectile structure in CDCC calculations

Nuclear and Coulomb breakup of the weakly bound6Li nucleus with targets in the range fromA=59to 208

Theoretical study of the elastic breakup of weakly bound nuclei at near-barrier energies

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A bargain at twice the price

Cited by 63 publications

References 0 publications

Sensitivity of8B breakup cross section to projectile structure in CDCC calculations

Sensitivity of8B breakup cross section to projectile structure in CDCC calculations

Nuclear and Coulomb breakup of the weakly bound6Li nucleus with targets in the range fromA=59to 208

Theoretical study of the elastic breakup of weakly bound nuclei at near-barrier energies

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Sensitivity of⁸B breakup cross section to projectile structure in CDCC calculations

Sensitivity of⁸B breakup cross section to projectile structure in CDCC calculations