153 research outputs found

    Cross section of 36S(n,γ)37S^{36}S(n,\gamma)^{37}S

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    At the Karlsruhe pulsed 3.75 MV Van de Graaff accelerator the 36S(n,γ)37S(5.05min)^{36}S(n,\gamma)^{37}S(5.05 min) cross section was measured by the fast cyclic activation technique via the 3.103 MeV γ\gamma-ray line of the 37^{37}S-decay. Samples of elemental sulfur enriched in 36^{36}S by 5.933 % were irradiated between two gold foils which served as capture standards. The capture cross section was measured at the neutron energies 25, 151, 176, and 218 keV, respectively. The 36S(n,γ)37S^{36}S(n,\gamma)^{37}S-cross section in the thermonuclear and thermal energy range has been calculated using the direct-capture (DC) model combined with the folding procedure used for the determination of the potentials. The non-resonant experimental data for this reaction can be reproduced excellently using this method. The input parameters of the DC-calculation (masses, Q-values, nuclear density distributions, spectroscopic factors, spin-parity assignments and excitation energies of the low-lying states of the residual nucleus) have been taken from the available experimental data.Comment: 8 pages, using revtex.sty plus postscript figures 4 and 5 available as separate files. The uuencoded postscript file with the text and figures 4 and 5 is available at ftp://is1.kph.tuwien.ac.at/pub/ohu/sulfur.uu, figures 1, 2 and 3 are available upon reques

    Measurement of direct neutron capture by neutron-rich sulfur isotopes

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    Thermal neutron capture cross sections for 34^{34}S(n,γ\gamma)35^{35}S and 36^{36}S(n,γ\gamma)37^{37}S have been measured and spectroscopic factors of the final states have been extracted. The calculated direct-capture cross sections reproduce the experimental data.Comment: 4 pages (uses espcrc1.sty), 1 postscript figure (uses psfig), accepted for publication in Nucl. Phys. A (Suppl.), uuencoded tex-files and postscript-files available at ftp://is1.kph.tuwien.ac.at/pub/ohu/Stherm.u

    Direct neutron capture of 48Ca at kT = 52 keV

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    The neutron capture cross section of 48Ca was measured relative to the known gold cross section at kT = 52 keV using the fast cyclic activation technique. The experiment was performed at the Van-de-Graaff accelerator, Universitaet Tuebingen. The new experimental result is in good agreement with a calculation using the direct capture model. The 1/v behaviour of the capture cross section at thermonuclear energies is confirmed, and the adopted reaction rate which is based on several previous experimental investigations remains unchanged.Comment: 9 pages (uses Revtex), 2 postscript figures, accepted for publication as Brief Report in Phys. Rev.

    Measurement of neutron capture on 48^{48}Ca at thermal and thermonuclear energies

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    At the Karlsruhe pulsed 3.75\,MV Van de Graaff accelerator the thermonuclear 48^{48}Ca(n,γ\gamma)49^{49}Ca(8.72\,min) cross section was measured by the fast cyclic activation technique via the 3084.5\,keV γ\gamma-ray line of the 49^{49}Ca-decay. Samples of CaCO3_3 enriched in 48^{48}Ca by 77.87\,\% were irradiated between two gold foils which served as capture standards. The capture cross-section was measured at the neutron energies 25, 151, 176, and 218\,keV, respectively. Additionally, the thermal capture cross-section was measured at the reactor BR1 in Mol, Belgium, via the prompt and decay γ\gamma-ray lines using the same target material. The 48^{48}Ca(n,γ\gamma)49^{49}Ca cross-section in the thermonuclear and thermal energy range has been calculated using the direct-capture model combined with folding potentials. The potential strengths are adjusted to the scattering length and the binding energies of the final states in 49^{49}Ca. The small coherent elastic cross section of 48^{48}Ca+n is explained through the nuclear Ramsauer effect. Spectroscopic factors of 49^{49}Ca have been extracted from the thermal capture cross-section with better accuracy than from a recent (d,p) experiment. Within the uncertainties both results are in agreement. The non-resonant thermal and thermonuclear experimental data for this reaction can be reproduced using the direct-capture model. A possible interference with a resonant contribution is discussed. The neutron spectroscopic factors of 49^{49}Ca determined from shell-model calculations are compared with the values extracted from the experimental cross sections for 48^{48}Ca(d,p)49^{49}Ca and 48^{48}Ca(n,γ\gamma)49^{49}Ca.Comment: 15 pages (uses Revtex), 7 postscript figures (uses psfig), accepted for publication in PRC, uuencoded tex-files and postscript-files also available at ftp://is1.kph.tuwien.ac.at/pub/ohu/Ca.u
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