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Ogloblin, A. A.; Khoa, Dao T.; Kondō, Y.; Glukhov, Yu.A.; Demyanova, A. S.; Rozhkov, Mikhail; Satchler, G.R.; Goncharov, S. A.

doi:10.1103/physrevc.57.1797

Cited by 50 publications

(82 citation statements)

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“…In contrast to the 16 O + 16 O system, the Airy structure of the nuclear rainbow for the asymmetric 16 O + 12 C system, for which refraction is very strong, is clearly observed in experimental angular distributions without being obscured by symmetrization. For this system, a global potential that reproduces the energy evolution of the Airy minimum in the angular distributions over a wide range of incident energies at E L = 62 ∼1503 MeV [13][14][15][16][17] • ). It has been impossible to model a first-order Airy minimum A1 at this large angle with the established global potential [19].…”

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confidence: 99%

Evidence for a secondary bow in Newton's zero-order nuclear rainbow

Ohkubo

Hirabayashi

2014

Phys. Rev. C

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Rainbows are generally considered to be caused by static refraction and reflection. A primary and a secondary rainbow appear due to refraction and internal reflection in a raindrop as explained by Newton. The quantum nuclear rainbow, which is generated by refraction in the nucleus droplet, only has a "primary" rainbow. Here we show for the first time evidence for the existence of a secondary nuclear rainbow generated dynamically by coupling to an excited state without internal reflection. This has been demonstrated for experimental 16 Newton, who explained the mechanism of the rainbow by refraction and reflection [1][2][3], believed in the existence of the zero-order rainbow without internal reflection in a droplet. Newton's zero-order rainbow [4] was realized in quantum systems when Goldberg et al.[5] observed a nuclear rainbow in high-energy α-particle scattering. The quantum nuclear rainbow is generated by the nuclear potential, which acts as a Luneburg lens [6], where refraction is the only active mechanism and a "primary" rainbow can only exist because there are no higher-order terms like in Nussenzveig's expansion for the meteorological rainbow [7]. We report here evidence for the unexpected existence of a secondary bow in the nuclear rainbow.The nuclear rainbow is very important in determining the interaction potential family up to the internal region without discrete ambiguity [5] and has been studied extensively [8,9]. The nuclear rainbow is also powerful for studies of nuclear cluster structure in the bound and unbound energy regions. In fact, the global nuclear potential, which describes nuclear rainbow scattering for typical α + 16 O, α + 40 Ca, and 16 O + 16 O systems, can reproduce scattering over a wide range of incident energies and cluster structures of 20 Ne, 44 Ti, and 32 S in the bound and unbound energy regions, respectively, in a unified way [10][11][12]. In contrast to the 16 O + 16 O system, the Airy structure of the nuclear rainbow for the asymmetric 16 O + 12 C system, for which refraction is very strong, is clearly observed in experimental angular distributions without being obscured by symmetrization. For this system, a global potential that reproduces the energy evolution of the Airy minimum in the angular distributions over a wide range of incident energies at E L = 62 ∼1503 MeV [13][14][15][16][17] • ). It has been impossible to model a first-order Airy minimum A1 at this large angle with the established global potential [19]. Thus, the reason why the global potential fails to reproduce the Airy minimum of the nuclear rainbow at E L = 281 MeV has been a mystery and raised a serious question of the common belief that nuclear rainbow scattering can determine the potential uniquely.The purpose of this paper is to present for the first time evidence for the existence of a secondary nuclear rainbow in the 16 O + 12 C scattering generated dynamically by a quantum effect without internal reflections of classical concept, which is completely different from the Newton's meteorological se...

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Evidence for a secondary bow in Newton's zero-order nuclear rainbow

Ohkubo

Hirabayashi

2014

Phys. Rev. C

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“…The uniquely determined interaction potential made it possible to study the cluster structure of the compound system above and below the threshold energy by unifying unbound and bound states as typically shown for the α+ 16 O and α+ 40 Ca systems [4]. The nuclear rainbow has also been observed for typical heavy ion systems such as 16 O+ 16 O, 16 O+ 12 C and 12 C+ 12 C, for which the higher order Airy structure has been clearly observed [3,[5][6][7][8][9][10]. The interaction potential uniquely determined for the most typical 16 O+ 16 O system made it possible to understand the superdeformed 16 …”

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confidence: 99%

Refractive effects and Airy structure in inelasticO16+C12rainbow scattering

et al. 2014

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Inelastic16 O + 12 C rainbow scattering to the 2 + (4.44 MeV) state of 12 C was measured at the incident energies, EL = 170, 181, 200, 260 and 281 MeV. A systematic analysis of the experimental angular distributions was performed using the coupled channels method with an extended double folding potential derived from realistic wave functions for 12 C and 16 O calculated with a microscopic α cluster model and a finite-range density-dependent nucleon-nucleon force. The coupled channels analysis of the measured inelastic scattering data shows consistently some Airy-like structure in the inelastic scattering cross sections for the first 2 + state of 12 C, which is somewhat obscured and still not clearly visible in the measured data. The Airy minimum was identified from the analysis and the systematic energy evolution of the Airy structure was studied. The Airy minimum in inelastic scattering is found to be shifted backward compared with that in elastic scattering.

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“…Nuclear rainbows have been widely observed in elastic α particle scattering and heavy-ion scattering under incomplete absorption, which excludes a large class of potential ambiguities of the nucleus-nucleus interaction potential [7][8][9]. The potential that describes rainbow scattering has been powerful in the study of the cluster structure of nuclei such as α cluster structure in 44 [7,[12][13][14][15][16][17][18][19].…”

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confidence: 99%

Existence of inelastic supernumerary nuclear rainbow in O16+C12 scattering

2017

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The existence of a supernumerary nuclear rainbow in inelastic scattering is reported. This is done by studying inelastic 16 O scattering from 12 C, exciting the 2 + (4.44 MeV) state of 12 C and elastic scattering at the incident energies in the range 124 to 200 MeV, using the coupled channels method. An extended double folding potential is used. This is derived from realistic wave functions for 12 C and 16 O calculated with a microscopic α cluster model and a finite-range density-dependent nucleon-nucleon force. Excitations to the 2 + (4.44 MeV), 3 − (9.64 MeV) and 4 + (14.08 MeV) states of 12 C, and the 3 − (6.13 MeV) and 2 + (6.92 MeV) states of 16 O are included in the coupled channels calculations. The emergence of the supernumerary bow is understood by the properties of both the Luneburg-lens-like potential in the internal region and diffuse attraction in the outer region. The existence of a supernumerary rainbow for inelastic scattering in addition to the existence of a dynamically created secondary rainbow and a dynamically refracted primary rainbow for elastic scattering, which are not observed in meteorological rainbows, further deepens the understanding of nuclear rainbows.

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Pronounced Airy structure in elastic16O+12Cscattering at

Cited by 50 publications

References 23 publications

Evidence for a secondary bow in Newton's zero-order nuclear rainbow

Evidence for a secondary bow in Newton's zero-order nuclear rainbow

Refractive effects and Airy structure in inelasticO16+C12rainbow scattering

Existence of inelastic supernumerary nuclear rainbow in O16+C12 scattering

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