Elastic Scattering of Fast Neutrons by Tritium and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

Seagrave, J.D.; Cranberg, Lawrence; Simmons, J. E.

doi:10.1103/physrev.119.1981

Cited by 91 publications

(29 citation statements)

References 26 publications

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“…The magnitude and energy dependence of the beam-dependent background observed from targets containing no 3 H are consistent with the known 48 Ti(p, n) [39] and 49 Ti(p, n) [40] cross sections. Using the known Ti areal density, the background present in the measurements using the Cu-backed 3 H target is estimated to be at most 0.2%, and was therefore neglected.…”

Section: Data Analysis and Resultssupporting

confidence: 59%

“…[22][23][24]26], and references therein. The total cross section for 3 He(n, p) 3 H can also be found by subtracting the elastic neutron cross section from the total neutron cross section (see Seagrave, Cranberg, and Simmons [48] and Alfimenkov et al [49]). However, since the (n, p) cross section is a small fraction of the total cross section (for E n > ∼ 50 keV), this subtraction can be subject to rather large uncertainties.…”

Section: Appendix: Previous Datamentioning

confidence: 99%

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Total cross section of the3H(p,n)3Hereaction from th

et al. 1999

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We report new measurements of the total cross section for the 3 H(p, n) 3 He reaction from threshold (Ep = 1.02 MeV) to Ep = 4.5 MeV. The experiment utilized specially prepared Ti-3 H targets, and neutrons were detected using a 4π detector. A weak resonant structure due to an excited state in 4 He is observed which was not seen in previous cross section measurements. A new expression for the 3 He(n, p) 3 H thermonuclear reaction rate for temperatures below 10 GK is presented which will allow for more accurate calculations of the yields of light elements produced by big-bang nucleosynthesis.

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Section: Data Analysis and Resultssupporting

confidence: 59%

Section: Appendix: Previous Datamentioning

confidence: 99%

Total cross section of the3H(p,n)3Hereaction from th

et al. 1999

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“…As can be seen by inspecting the two figures, the three curves almost always perfectly coincide and cannot be distinguished. We have also reported the experimental data for the n-3 H differential cross section [46] and the three p-3 He observables [29][30][31][32][33]35]. We note that the differences between the three calculations, where they can be appreciated, are in any case always smaller than the experimental errors.…”

Section: Lsjjz Amentioning

confidence: 99%

Benchmark calculation ofn-3H andp-3He

et al. 2011

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The n-3 H and p-3 He elastic phase-shifts below the trinucleon disintegration thresholds are calculated by solving the 4-nucleon problem with three different realistic nucleon-nucleon interactions (the I-N3LO model by Entem and Machleidt, the Argonne v18 potential model, and a low-k model derived from the CD-Bonn potential). Three different methods -Alt, Grassberger and Sandhas, Hyperspherical Harmonics, and Faddeev-Yakubovsky -have been used and their respective results are compared. For both n-3 H and p-3 He we observe a rather good agreement between the three different theoretical methods. We also compare the theoretical predictions with the available experimental data, confirming the large underprediction of the p-3 He analyzing power.

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“…This is shown in Figure 1, which plots (~crtot!7t)(p+3H--+n+3He); the experimental points are taken from Jarvis et al (1950), Bransden, Robertson, and Swan (1956), Jarvis (1957), Macklin and Gibbons (1958), and Seagrave, Cranberg, and Simmons (1960).…”

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Deuteron Capture by Deuterons and the Structure of 4He

Delves¹

1962

Aust. J. Phys.

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SummaryThe four-body scattering matrix describing the various scattering states of two protons and two neutrons is analysed to see what information can be gained on the structure of the bound state, 4He. It is found that an estimate can be given of the fraction of time that 'He appears as two deuterons; this estimate is· in turn used to calculate the cross sections for the process d(d, y)'He. The low energy n-3 He singlet elastic scattering parameters appear to be fairly well determined by the data studied.1. INTRODUCTION .A large amount of information concerning the existence and structure of any bound states of a system is in principle contained in the positive energy scattering matrix for the system. This information can be extracted if the energy variation of the scattering matrix can be extrapolated back to the bound state energy; and such a procedure has been used with success to discuss the deuteron (see, e.g. Blatt and Weisskopf 1952) and the triton and 3He (Delves 1960). However, in both cases the scattering matrix is, to a reasonable approximation, diagonal, and the small off-diagonal part of little importance, so that only one channel need be considered; it is of interest to show that the procedure can be carried through also when the off-diagonal terms are not intrinsically small and the coupled channels must be considered simultaneously. Of course extra information is obtained if this be done; in the language of the clustermodel, we obtain an estimate of the relative importance of various clusters in the expansion of the ground state. We carry through the procedure here for 4He; the channels which enter are then the singlet S-state channels for n-3 He, p-3H, and d-d scattering. The first two of these represent the principal clusters in 4He, and we obtain an estimate of the importance of the d-d cluster in the ground state.These results are used to calculate approximately the cross section for deuteron capture by deuterons, using the asymptotic form of the 4He wave function. The accuracy of this procedure is discussed later.The nucleus 4He has three alternative two-particle photo disintegration modes 4He+y--+p+3H-19'708 MeV, --+n+ 3 He-20·472 MeV, --+d+d-23 ·748 MeV,

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Elastic Scattering of Fast Neutrons by Tritium andHe3

Cited by 91 publications

References 26 publications

Total cross section of the3H(p,n)3Hereaction from th

Total cross section of the3H(p,n)3Hereaction from th

Benchmark calculation ofn-3H andp-3He

Deuteron Capture by Deuterons and the Structure of 4He

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