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Dwarakanath, M.R.; Winkler, H.

doi:10.1103/physrevc.4.1532

Cited by 61 publications

(56 citation statements)

References 9 publications

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“…The absolute S(E) values of refs. [20] and [21] (as well as those from the present work, section VI) agree -at overlapping energy regimes -within experimental uncertainties, while those of refs. [22] and [23] are lower by about 25%, suggesting a renormalization of their absolute scales.…”

Section: Introductionsupporting

confidence: 45%

“…The data obtained at higher energies (450 kV accelerator in Bochum) with the LUNA setup [5] are also included for completeness. Previous literature data obtained at E = 24.51 to 1080 keV [20,21] are also shown in Fig. 9.…”

Section: Effective Beam Energy and Absolute Cross Sectionmentioning

confidence: 64%

“…1. Astrophysical S(E) factor of the 3 He( 3 He,2p) 4 He reaction as obtained in previous work [20,21] (section II). The solid curve is a polynomial fit to the data and the dotted curve a theoretical calculation [26] with eight E detectors (arranged in two consecutive boxes) as observed with an α-source (E α = 5.5 MeV), which was moved along the beam axis (distance d A measured from the center of the entrance aperture A).…”

Section: Acknowledgementsmentioning

confidence: 99%

“…4 He reaction represents in the exit channel a 3-body-breakup: if the breakup is direct, one should observe a continuous energy distribution of the ejectiles described by phase-space considerations; if the breakup follows a sequential process, the energies of the ejectiles are described by 2-body kinematics. Experiments have shown [19][20][21] that at energies below E = 1 MeV the reaction proceeds predominantly via a direct mechanism and that the angular distributions approach isotropy with decreasing energy. The S(E) energy dependence observed by various groups [19][20][21][22][23] represents a consistent picture (Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Experiments have shown [19][20][21] that at energies below E = 1 MeV the reaction proceeds predominantly via a direct mechanism and that the angular distributions approach isotropy with decreasing energy. The S(E) energy dependence observed by various groups [19][20][21][22][23] represents a consistent picture (Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

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The cross section of 3He(3He,2p)4He measured at solar energies

Junker

Arpesella

Bellotti

et al. 1999

Nuclear Physics B - Proceedings Supplements

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We report on the results of the 3 He( 3 He,2p) 4 He experiment at the underground accelerator facility LUNA (Gran Sasso). For the first time the lowest projectile energies utilized for the cross section measurement correspond to energies below the center of the solar Gamow peak (E 0 =22 keV). The data provide no evidence for the existence of a hypothetical resonance in the energy range investigated. Although no extrapolation is needed anymore (except for energies at the low-energy tail of the Gamow peak), the data must be corrected for the effects of electron screening, clearly observed the first time for the 3 He( 3 He,2p) 4 He reaction. The effects are however larger than expected and not understood, leading presently to the largest uncertainty on the quoted S b (E 0 ) value for bare nuclides (=5.40 MeV b).

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Section: Introductionsupporting

confidence: 45%

Section: Effective Beam Energy and Absolute Cross Sectionmentioning

confidence: 64%

Section: Acknowledgementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

The cross section of 3He(3He,2p)4He measured at solar energies

Junker

Arpesella

Bellotti

et al. 1999

Nuclear Physics B - Proceedings Supplements

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The Modified J-Matrix Approach for Cluster Descriptions of Light Nuclei

Arickx

Broeckhove

Nesterov

et al.

The J-Matrix Method

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Microscopic study of the low-energy3He(3He, 2p)4He and3H(3H, 2n)4He fusion cross sections

Typel

Blüge

Langanke

et al. 1991

Z. Physik A - Hadrons and Nuclei

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We have calculated the 3He(3He, 2p)4Ue and 3H(3H, 2n)eHe reaction cross sections at low energies within the microscopic multichannel resonating group method. For both reactions, we find good agreement with experiment.For the 3H(3H, 2n)4He reaction, our calculated energy dependence reproduces that of each individual low-energy experimental data set, except for a normalization constant. Using this fact, we derive at a low-energy 3H(3H, 2n)4He rate by taking the averaged mean of these fits. 25.10. +s; 25.55.e; 25.55.Ek The 3He(3He, 2p)4He reaction is an important part within the network of hydrogen burning in stars being the dominant source for the production of 4He [1 ]. This reaction as well as its mirror reaction 3H(3H, 2n)4He are believed to have also played a role within the nucleosynthesis in the early epoch of our universe [2,3]. Additionally, the fusion of two tritons via the 3H(3H, 2n)gHe reaction is one of the key nuclear reactions studied in muon-catalyzed fusion [4]. PACS:Various experimental groups have studied the 3He(3He, 2p)4He reaction at low energy [5,6]. As these measurements basically agree with each other, it is generally believed that its reaction cross section at astrophysically important energies is rather well known. However, to derive the cross section at these astrophysically most effective energies (E~20 keV for temperatures at the solar core), one has to extrapolate the measured cross section down in energy [1]. Due to the lack of reliable theoretical guidelines, this extrapolation has been performed simply using a quadratic polynomial [6]. There have been several experimental attempts to measure the low-energy 3H(3H, 2n)4He cross section. However, it has been pointed out [7] that some of these measurements might be subject to large systematic errors. The 3H(3H, 2n)4He data have been parametrized by Hale et al. within an R-matrix formulation [8] which at low energies is dominated by the Los Alamos data [9] having by far the smallest experimental uncertainties.To our knowledge there exists no theoretical study which calculates the absolute cross sections for either of the two reactions at low energies. In this paper we want to report about the first microscopic studies of the lowenergy 3He(3He, 2p)4He and 3H(3H, 2n)4He reactions performed within the framework of the coupled-channel resonating group method (RGM).A rigorous study of the two reactions requires the consideration of a 3-cluster scattering state in the outgoing channel. However, in our approach we will follow Siinkel [10] who viewed the reaction as a two-step process: After formation of the compound nucleus, the system will firstly decay into an e particle and a 2-nucleon cluster. The latter, which is energetically unbound, will then finally decay into two nucleons; this, however, is expected to occur outside the range of the nuclear forces.We will in the following neglect possible D-state admixtures in the cluster wave functions. Then, the two 3He(3H) clusters may be coupled to total spins S = 0 and 1. To fulfill the requir...

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He3(He3

Cited by 61 publications

References 9 publications

The cross section of 3He(3He,2p)4He measured at solar energies

The cross section of 3He(3He,2p)4He measured at solar energies

The Modified J-Matrix Approach for Cluster Descriptions of Light Nuclei

Microscopic study of the low-energy3He(3He, 2p)4He and3H(3H, 2n)4He fusion cross sections

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