Specific distortion effects in 3H + α and 3He + α systems

Kanada, Hiroyuki; Kaneko, T.; Tang, Y.C.

doi:10.1016/0375-9474(82)90584-x

Cited by 58 publications

(18 citation statements)

References 36 publications

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“…By including the (λ 2 = 2, J 2 = 3) excited state we take into account the 6 Li polarization which is connected with rotational excitation. 3 He has no excited states, and so we restricted the calculation to a zero value for the orbital angular momentum only.…”

Section: Parameters Of the Calculationmentioning

confidence: 99%

“…The first, introduced by Tang et al [1][2][3][4][5][6], considers internal monopole excitations to describe the polarization. The second, introduced by the Kiev-Antwerp collaboration [7][8][9][10][11][12][13][14][15], is based on collective monopole and quadrupole polarizations of the compound nucleus.…”

Section: Introductionmentioning

confidence: 99%

“…In the reaction 6 Li(p, 3 He) 4 He one structureless subsystem, the proton, and three cluster subsystems 6 Li, 4 He and 3 He are involved. They are connected with the lowest binary channels 4 He + 3 He and 6 Li + p which define the main properties of the bound and some resonance states of 7 Be.…”

Section: Introductionmentioning

confidence: 99%

“…This system exhibits a well determined set of bound and resonance states, and has been thoroughly studied by many microscopical methods [16][17][18][19][20][21][22][23][24][25]. Moreover, two reactions which are connected to this nucleus, 3 He(α, γ ) 7 Be and 6 Li(p, 3 He) 4 He, are important in astrophysical models [26,27]. The former reaction has been extensively investigated by different microscopic and semi-microscopic methods and is involved in the solar neutrino problem [20,21,23,24,[28][29][30].…”

Section: Introductionmentioning

confidence: 99%

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A microscopic three-cluster model with nuclear polarization applied to the resonances of 7Be and the reaction 6Li(p, 3He)4He

et al. 2009

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A microscopic model for three-cluster configurations in light nuclei is presented. It uses an expansion in terms of Faddeev components for which the dynamic equations are derived. The model is designed to investigate binary channel processes in a compound system. Gaussian and oscillator bases are used to expand the wave function and to represent appropriate boundary conditions. We study the effect of cluster polarization on ground and resonance states of 7 Be, and on the astrophysical S-factor of the reaction 6 Li(p, 3 He) 4 He.

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Section: Parameters Of the Calculationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A microscopic three-cluster model with nuclear polarization applied to the resonances of 7Be and the reaction 6Li(p, 3He)4He

et al. 2009

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“…For a given many-body Hamiltonian the relative part of the two-cluster many-body wave functions is determined by solving the RGM equations [11] imposing appropriate boundary conditions on the relative wave functions. As effective nucleon-nucleon interactions we adopted the Wildermuth-Tang (WT) force [12], a modified version of this force (MWT) [13] as well as the Volkov force V2 [14]. Combined with the microscopic spin-orbit interaction of [12] we expect from the results of [11] (which, however, used a slightly different spin-orbit force) that these forces yield 3H(o~, ~)TLi cross sections which are consistent with the low energy data of [101.…”

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confidence: 99%

On discrepancies within the experimental and theoretical low energy3H(?, ?)7Li cross sections

Altmeyer

Kolbe

Warmann

et al. 1988

Z. Physik A - Atomic Nuclei

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The two presently available measurements of the low-energy 3H(a, ~)TLi reaction differ from each other by roughly 30% in total magnitude as well as in their determination of the branching ratios for the transition into the two final 7Li bound states. Studying the 3H(e, 7)7Li reaction in the framework of the microscopic Resonating Group Method we were able to reproduce both experimental total cross sections using different effective nucleon-nucleon interactions. However, none of the effective forces yields branching ratios compatible with the data measured by the Toronto-M/inster-collaboration. PACS: 25.55. -e; 25.70.Jj; 21.60.GxThe 3H(e, 7)7Li reaction is a main source for the 7Li production during the big bang nucleosynthesis [1]. Measurements of this reaction rate in the energy range E= 150-600 keV performed by Griffith et al.[2] are consistent with the assumption of an energy independent astrophysical S-factor for the 3H(c~, 7)7Li reaction at stellar energies with a value of S(0)=0.064keV-b [3]. This energy-independent S(E)-factor has been adopted in standard hot big bang model studies [4,5].Recently several microscopic calculations of the 3H(e, 7)VLi reaction at low energies (E < 1 MeV) have been performed in the framework of the Resonating Group Method [6][7][8] or on the basis of a microscopic potential model [9]. While these studies reproduced the experimental data of [2], they do not support the assumption of an energy-independent 3H(e, 7)7Li S-factor at low energies. In agreement with each other these calculations predict the S-factor to increase noticeably with decreasing energy resulting in S(0)~0.10keV.b [6][7][8][9]. Consequently the microscopic studies recommend a higher thermally averaged 3H(c~, 7)7Li reaction rate at astrophysically important temperatures T< 109K than the rate given by Fowler et al. [-3] resulting in a production of 7Li during the big bang which is noticeably higher than currently believed.Motivated by the theoretical predictions a Mfinster-Toronto collaboration [10] has very recently measured the 3H(~, y)VLi cross sections in the energy range E = 80-500 keV. In fact the new experimental data show the predicted increase of the S-factor towards E =0, however, they exceed the data of [-2] by roughly 30% and are also noticeably larger than the microscopically calculated cross sections [6][7][8][9]. An extrapolation of the new experimental data resulted in S (0) ~ 0.14 + 0.02 keV. b [ 10]. Without knowledge of the data of [10] Kajino investigated the dependence of the microscopically calculated 3H(c~, 7)7Li cross sections and those of its analogue reaction 3He(e, 7)TBe on the effective nucleon-nucleon interaction used in these studies [11]. As a main result he observed that the various calculations predict different energy dependences of the Sfactor in the astrophysically important energy regime. In close relation to the study of Kajino [11] we will show in the following that the experimental data of [10] are compatible with the results of the microscopic calculations if other force...

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Investigation of the Partner—Potentials from Supersymmetric Quantum Mechanics by Bremsstrahlung

Liu¹

1994

Lecture Notes in Physics

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Specific distortion effects in 3H + α and 3He + α systems

Cited by 58 publications

References 36 publications

A microscopic three-cluster model with nuclear polarization applied to the resonances of 7Be and the reaction 6Li(p, 3He)4He

A microscopic three-cluster model with nuclear polarization applied to the resonances of 7Be and the reaction 6Li(p, 3He)4He

On discrepancies within the experimental and theoretical low energy3H(?, ?)7Li cross sections

Investigation of the Partner—Potentials from Supersymmetric Quantum Mechanics by Bremsstrahlung

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