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

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dc.creatorBeer, H.
dc.creatorCoceva, C.
dc.creatorSedyshev, P. V.
dc.creatorPopov, Yu. P.
dc.creatorHerndl, H.
dc.creatorHofinger, R.
dc.creatorMohr, P.
dc.creatorOberhummer, H.
dc.date1996-08-07
dc.date.accessioned2026-07-07T11:14:53Z
dc.date.available2026-07-07T11:14:53Z
dc.descriptionAt the Karlsruhe pulsed 3.75\,MV Van de Graaff accelerator the thermonuclear $^{48}$Ca(n,$γ$)$^{49}$Ca(8.72\,min) cross section was measured by the fast cyclic activation technique via the 3084.5\,keV $γ$-ray line of the $^{49}$Ca-decay. Samples of CaCO$_3$ enriched in $^{48}$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 $γ$-ray lines using the same target material. The $^{48}$Ca(n,$γ$)$^{49}$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 $^{49}$Ca. The small coherent elastic cross section of $^{48}$Ca+n is explained through the nuclear Ramsauer effect. Spectroscopic factors of $^{49}$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 $^{49}$Ca determined from shell-model calculations are compared with the values extracted from the experimental cross sections for $^{48}$Ca(d,p)$^{49}$Ca and $^{48}$Ca(n,$γ$)$^{49}$Ca.
dc.description15 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.uu
dc.identifierhttps://arxiv.org/abs/nucl-ex/9608002
dc.identifierhttp://arxiv.org/abs/nucl-ex/9608002
dc.identifierPhys.Rev.C54:2014-2022,1996
dc.identifierdoi:10.1103/PhysRevC.54.2014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/192223
dc.subjectNuclear Experiment
dc.subjectNuclear Theory
dc.titleMeasurement of neutron capture on $^{48}$Ca at thermal and thermonuclear energies
dc.typetext

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