Cluster structure of 6He studied by means of 6He + p reaction at 25 MeV/n energy

Wolski, R.; Фомичев, А. С.; Родин, А. М.; Sidorchuk, S. I.; Stepantsov, S. V.; Ter‐Akopian, G. M.; Chelnokov, M. L.; Gorshkov, V. A.; Lavrentev, A. Yu.; Oganessian, Yu. Ts.; Roussel‐Chomaz, P.; Mittig, W.; David, I.

doi:10.1016/s0370-2693(99)01079-5

Cited by 55 publications

(5 citation statements)

References 15 publications

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“…However, the extracted SFs can contain uncertainties due to the ambiguities in the optical potentials. To minimize these uncertainties, the phenomenological optical potentials which fit the elastic scattering data at the reaction energies are preferred and in case such data are unavailable, especially for the exotic nuclei, simultaneous measurements of the elastic and transfer cross sections serve as ideal choice [49][50][51]. On the other hand, for the bound states, the two-body potentials such as Woods-Saxon (WS) or Gaussian type are mainly used with their parameters chosen to reproduce the experimental binding energies of the participating clusters, the usual separation energy prescription.…”

Section: Test Of the Peripheralitymentioning

confidence: 99%

Cluster transfer reactions with the combined R-matrix and Lagrange-mesh methods

Shubhchintak

2021

Eur. Phys. J. A

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We have recently applied the R-matrix method to transfer reactions in the distorted wave Born approximation (DWBA) framework. In our approach the wave function in the internal region is expanded in terms of Lagrange basis, which provides a fast and efficient way to compute the matrix elements. This paper is a short review of our work on transfer reactions. I discuss applications of our approach by considering the 16 O(d, n) 17 F and 12 C( 7 Li, t) 16 O reactions, which are specific examples of neutron and α transfer, respectively. In particular, I discuss the role of the remnant terms, post-prior form equivalence, peripherality of the reaction and sensitivity of the transfer cross sections to the bound state wave functions. Effects of the remnant terms and of the supersymmetric bound state potentials on the extracted spectroscopic factors are also discussed.

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Section: Test Of the Peripheralitymentioning

confidence: 99%

Cluster transfer reactions with the combined R-matrix and Lagrange-mesh methods

Shubhchintak

2021

Eur. Phys. J. A

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“…Since the extended neutron distribution is prominent at the nuclear surface and the spin-orbit coupling is, in nature, a surface phenomenon, it is stimulating to see how the extended neutron distributions affect the spin asymmetry, i.e., vector analyzing power in proton elastic scattering.In this Letter, we report new results of vector analyzing power for the p-6 He elastic scattering at 71 MeV/nucleon, measured with a newly developed polarized proton target. The results are compared with microscopic folding model calculations.Although cross sections in proton elastic scattering from 6 He have been extensively measured over a wide range of energies [4][5][6][7][8][9], until recently there had been no measurement of vector analyzing power. Since unstable nuclei are produced as secondary beams, we need a polarized proton target, practically in the solid state, for the spin-asymmetry studies.…”

mentioning

confidence: 99%

“…Although cross sections in proton elastic scattering from 6 He have been extensively measured over a wide range of energies [4][5][6][7][8][9], until recently there had been no measurement of vector analyzing power. Since unstable nuclei are produced as secondary beams, we need a polarized proton target, practically in the solid state, for the spin-asymmetry studies.…”

mentioning

confidence: 99%

Analyzing power for proton elastic scattering from the neutron-richHe6nucleus

et al. 2010

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Vector analyzing power for the proton-6 He elastic scattering at 71 MeV/nucleon has been measured for the first time, with a newly developed polarized proton solid target working at low magnetic field of 0.09 T. The results are found to be incompatible with a t-matrix folding model prediction. Comparisons of the data with g-matrix folding analyses clearly show that the vector analyzing power is sensitive to the nuclear structure model used in the reaction analysis. The α-core distribution in 6 He is suggested to be a possible key to understand the nuclear structure sensitivity. PACS numbers: 24.70.+s, 29.25.Pj Spin observables in scattering experiments have been rich sources of our understanding of nuclear structure, reaction, and interactions. One of the good examples is spin asymmetry in proton-proton and proton-nucleus (p-A) scatterings which is a direct manifestation of spinorbit coupling in the system. The first spin asymmetry measurements carried out by use of a double scattering method [1,2] clearly demonstrated that the spin-orbit coupling in nuclei is an order of magnitude stronger than that due to the relativistic effect [3]. At present the spin-orbit coupling in p-A scattering is quantitatively established through numerous experiments using polarized proton beams for stable targets.It is interesting to use spin asymmetry measurements to study unstable nuclei. Nuclei locating near the neutron drip line occasionally show distinctive structure such as halos or skins. The neutron rich 6 He nucleus is one of the typical nuclides with an extended neutron distribution. Since the extended neutron distribution is prominent at the nuclear surface and the spin-orbit coupling is, in nature, a surface phenomenon, it is stimulating to see how the extended neutron distributions affect the spin asymmetry, i.e., vector analyzing power in proton elastic scattering.In this Letter, we report new results of vector analyzing power for the p-6 He elastic scattering at 71 MeV/nucleon, measured with a newly developed polarized proton target. The results are compared with microscopic folding model calculations.Although cross sections in proton elastic scattering from 6 He have been extensively measured over a wide range of energies [4][5][6][7][8][9], until recently there had been no measurement of vector analyzing power. Since unstable nuclei are produced as secondary beams, we need a polarized proton target, practically in the solid state, for the spin-asymmetry studies. In addition, the solid polarized proton target should work under a low magnetic field of B ∼ 0.1 T for detection of recoiled protons with magnetic rigidity as low as 0.3 Tm. The traditional dynamical nuclear polarization technique [10], demanding a magnetic field higher than a few Tesla, can not be applied therefore. Although this difficulty might be overcome by applying a "spin frozen" operation, efforts to do so have not been successful so far. An alternative approach to overcome the problem is to develop a polarized target based on a new principle which...

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“…dσ/d𝛀 p+ 4 He 12.04, 17.45 [24], 31.0 [25], 40 [26], 52.3, 64.9 [27], 71.9 [28], 85 [29], and 156 [30] 6 He+p 25.1 [31][32][33], 38.3 [9],40.9 [11],41.6 [10,12], and 71 [13,14,34,35] 8 He+p 15.7 [36], 26.1 [37], 32 [38], 66 [39], and 72 [16,40] 2.THEORETICAL FORMALISM…”

Section: Data Nuclear Reaction Energy (Mev/n) [Ref]mentioning

confidence: 99%

Elastic Scattering of Some Halo Nuclei of Proton at Energies Below 200 MeV/N

Ebrahim,

mokhtar,

Ali

2023

Assiut University Journal of Multidisciplinary Scientific Resea

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A microscopic approach was used to analyse the investigation of the elastic scattering of protons on 4,6,8 He at energies up to 200 MeV/N. The microscopic single folding (SF) and São-Paulo (SP) potentials were used to generate the real part of the optical model potential, and the Woods-Saxon form was used to phenomenologically compute the imaginary part. Three distinct nuclear densities (GG, GO, and G2S) of 4,6,8 He and Gaussian form effective NN interactions were used to determine the SF potential. A renormalization factor 𝑁𝑅 of the folded real potential as well as the imaginary and spin-orbit potentials were among the free parameters used in the investigation, which was carried out using the FRESCO code. In addition, the overall reaction cross-sections 𝜎𝑅 in the three densities (GG, GO, and G2S) and the related real and imaginary volume integrals of interacting nucleon pairs were examined. The differential and reaction cross-section values that were obtained were in fair accord with the experimental data.

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Cluster structure of 6He studied by means of 6He + p reaction at 25 MeV/n energy

Cited by 55 publications

References 15 publications

Cluster transfer reactions with the combined R-matrix and Lagrange-mesh methods

Cluster transfer reactions with the combined R-matrix and Lagrange-mesh methods

Analyzing power for proton elastic scattering from the neutron-richHe6nucleus

Elastic Scattering of Some Halo Nuclei of Proton at Energies Below 200 MeV/N

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