A simpler approach to the geometrical efficiency of a parallel-disk source and detector system

Ruby, Lawrence; Rechen, J.

doi:10.1016/0029-554x(68)90491-6

Cited by 34 publications

(12 citation statements)

References 3 publications

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“…2, where an extended circular target faces a coaxially mounted detector in close geometry, were calculated by means of an integral method [21]. These results agree to better than 4~o with Monte-Carlo calculations [26] (see Table 1). The calculated solid angle for the setup of Fig.…”

Section: Solid Angle Determinationmentioning

confidence: 96%

Destruction of26Al in explosive nucleosynthesis

Trautvetter

Becker

Heinemann

et al. 1986

Z. Physik A - Atomic Nuclei

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The 26Al(n,p)26Mg reaction has been studied using neutron spectra which closely resembled Maxwell-Boltzmann (M.-B.) distributions with thermal energies of kT=40 x l0 6, 31 and 71keV and also for E,= 270-350 keV. These energies correspond to stellar temperatures T9=4.6 x 10 -7, 0.36, 0.82 and 3.1-4.1, where T 9 is in units of 109 K. The partial cross sections for the p0-(pl-)transition are found to equal 26+10(1,850 • 150), 13 • 6 (124 • 17), 16 + 13 (84 _ 14) and 21 • 8 (72 • 15) mb for the above neutron spectra, respectively. The astrophysical reaction rate is determined for the combined Poand p 1-transitions to be NA(av) =(0.324+O.026, 20.5+2.7, 22.6+_4.3 and 38.7• • 106 cm 3 mole-1 s-1. The results are compared with previous investigations and with statistical model calculations.

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Section: Solid Angle Determinationmentioning

confidence: 96%

Destruction of26Al in explosive nucleosynthesis

Trautvetter

Becker

Heinemann

et al. 1986

Z. Physik A - Atomic Nuclei

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“…in the setup of Fig. I b, where a cylindrical 14N target volume faces a coaxially mounted Si detector in close geometry, was determined by a Monte-Carlo calculation [15]. It has been shown for similar close geometries [12] that such calculations are reliable to better than 4%.…”

Section: Target Thickness T and Areal Number Density Ntmentioning

confidence: 99%

The cross section of14N(n, p)14C at stellar energies and its role as a neutron poison forS-process nucleosynthesis

Brehm

Becker

Rolfs

et al. 1988

Z. Physik A - Atomic Nuclei

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The absolute average cross section (o-) of the 14N(n, p) 14C reaction has been measured using neutron spectra that closely resemble Maxwell-Boltzmann distributions with thermal energies of kT = 25.0 and 52.4 keV: (o-) = 0.81 ___ 0.05 and 0.52 4-0.06 mb, respectively. The resulting reaction rates are nearly the same at T9=0.29 and 0.61, and their average, NA (o-v) = (1.3 _+ 0.1) x 105 cm 3 s-1 mol-1, is about a factor of three smaller than the previously adopted values obtained by extrapolation between thermal and higher-energy data. Thus, the 14N(n, p) 14C reaction plays a correspondingly smaller role as a neutron poison for s-process nucleosynthesis.

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“…Ruby's formula, giving the solid angle subtended at a disk source by a coaxial parallel-disk detector [Ruby-Rechen (1968)], is the following:…”

Section: Introductionmentioning

confidence: 99%