The scattering of He3 by He4

Barnard, Andries; Jones, C.M.; Phillips, G.C.

doi:10.1016/0029-5582(64)90235-4

Cited by 52 publications

(47 citation statements)

References 7 publications

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“…More specifically, the S(0) value varied by approximately 0.5% for channel radii 4.0 < r c < 5.0 fm. Figure 8 shows the result for the elastic scattering data of Barnard et al [20], as was obtained by the simultaneous R-matrix fit. The data set of [19] is also described reasonably well.…”

Section: R-matrix Analysis and Discussionmentioning

confidence: 99%

“…The analysis simultaneously included all the capture data shown in Fig. 7 (123 experimental points) as well as 3 He(α, α) 3 He scattering data from [19,20] (698 experimental points). These particular scattering data sets were chosen because they cover the same 7 Be excitation energy range as the capture data.…”

Section: R-matrix Analysis and Discussionmentioning

confidence: 99%

“…The latter uncertainty estimate was calculated with the MINOS method of MINUIT2 [29]. The final value, S(0) = 0.554 (20) keV b, is lower by only 1% from a recent evaluation of the modern data [11], where S(0) = 0.56(3) keV b, and 4.5% lower from the evaluation by Cyburt & Davids [12], where S(0) = 0.580(43) keV b. To understand the model uncertainty of the reaction better, we compared the shape of the present calculation with the calculations by Kajino et al [13], Descouvemont et al [14] and Neff [15].…”

Section: R-matrix Analysis and Discussionmentioning

confidence: 99%

“…4. The elastic scattering cross section, that is needed for the normalization of the data, was obtained from the R-matrix analysis of elastic scattering literature data [19,20], and is discussed in a following section. The result from this measurement was an angle value of 64.8…”

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

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AstrophysicalSfactor of3He(α,γ)7Be

et al. 2013

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Background:The 3 He(α, γ) 7 Be reaction is important for the neutrino production in the sun's core and the production of 7 Li during big bang nucleosynthesis. The reaction mechanism is characterized by a strong direct capture component and nearby broad unbound resonance levels.Purpose: Recent experiments have opened up a new energy window into the reaction mechanism and it becomes more and more evident that in order to understand the shape of the S-factor, theoretical calculations need to take into account possible resonance contributions from higher energies as well.Method: In the present work, a relatively wide energy window was investigated, Ecm = 300 − 1460 keV, by detecting the prompt γ-rays from the reaction. An extensive R-matrix analysis was performed, utilizing all modern literature capture data, as well as elastic scattering data, which are important in constraining some R-matrix parameters. Results:The new experimental data agree very well with the modern literature data. The final result from the R-matrix fit gives a zero-energy S-factor of S(0) = 0.554(20) keV b. A table with the newly calculated reaction rate is given. Conclusions:The simultaneous R-matrix analysis of the 3 He(α, γ) 7 Be and 3 He(α, α) 3 He channels yielded a reliable fit, consistent with all the included experimental data sets. In order to further constrain the reaction rate within the R-matrix framework, additional high energy capture data, γ-ray angular distributions and the inclusion of other relevant reaction channels are necessary.

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Section: R-matrix Analysis and Discussionmentioning

confidence: 99%

Section: R-matrix Analysis and Discussionmentioning

confidence: 99%

Section: R-matrix Analysis and Discussionmentioning

confidence: 99%

Section: Experimental Set-up and Proceduresmentioning

confidence: 99%

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AstrophysicalSfactor of3He(α,γ)7Be

et al. 2013

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“…[41][42][43], and angular distributions or excitation functions at low energies are reported in Refs. [31,[44][45][46].…”

Section: Introductionmentioning

confidence: 99%

Low-energyHe3(α,α)He3
Mohr¹
2009
Phys. Rev. C
32
4
33
1
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The cross sections of the 3 He(α, α) 3 He and 3 He(α, γ ) 7 Be reactions are studied at low energies using a simple two-body model in combination with a double-folding potential. At very low energies the capture cross section is dominated by direct s-wave capture. However, at energies of several MeV the d-wave contribution increases, and the theoretical capture cross section depends sensitively on the strength of the L = 2 potential. Whereas the description of the L = 2 elastic phase shift requires a relatively weak potential strength, recently measured capture data can be described only with a significantly enhanced L = 2 potential. A simultaneous description of the new experimental capture data and the elastic phase shifts is not possible within this model. Because of the dominating extranuclear capture, this conclusion holds in general for most theoretical models.

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The3He(?,?)7Be reaction and the solar neutrino problem

et al. 1982

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The capture reaction 3He(c~, y)TBe has been investigated in the energy range of E .... = 107 to 1,266 keV. The 4He or 3He beams of up to 300 gA particle current were incident on 3He or 4He gas targets, respectively. The gas target systems were all of the windowless and recirculating type. Excitation functions have been obtained with the use of an extended-static gas target, while the measurements of y-ray angular distributions involved a quasi-point supersonic jet system. The determination of absolute cross sections has been carried out with both types of gas target systems. The 7-ray yields in the 3He(~, 7)7Be reaction were detected using 80 cm 3 Ge(Li) detectors. The data lead to a zero-energy intercept of the astrophysical S(E) factor of S(0)=0.30+0.03 keV-b. This result reduces the calculated solar neutrino rate by a factor of 1.76.Nuclear Reactions: 3He(~, 7)7Be, E ..... = 107 to 1,266 keV; measured o-(E, E~,, 07.); deduced spectroscopic factors and astrophysical S-factor; solar neutrino problem; extended and quasi-point jet gas targets, Ge(Li) detectors.

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The scattering of He3 by He4

Cited by 52 publications

References 7 publications

AstrophysicalSfactor of3He(α,γ)7Be

AstrophysicalSfactor of3He(α,γ)7Be

Low-energyHe3(α,α)He3
Mohr¹
2009
Phys. Rev. C
32
4
33
1
View full text Add to dashboard Cite

The3He(?,?)7Be reaction and the solar neutrino problem

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The scattering of He3 by He4

Cited by 52 publications

References 7 publications

AstrophysicalSfactor of3He(α,γ)7Be

AstrophysicalSfactor of3He(α,γ)7Be

Low-energyHe3(α,α)He3Mohr1 2009Phys. Rev. C324331View full textAdd to dashboardCite

The3He(?,?)7Be reaction and the solar neutrino problem

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Low-energyHe3(α,α)He3
Mohr¹
2009
Phys. Rev. C
32
4
33
1
View full text Add to dashboard Cite