Gamma intensity standard from thermal neutron capture in 35Cl

Coceva, C.; Brusegan, A.; Vorst, C. Van der

doi:10.1016/0168-9002(96)00178-7

Cited by 21 publications

(6 citation statements)

References 8 publications

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“…( 1), the probability p a can be calculated from the known capture cross-section of 35 Cl and from the total cross-section of all sample components. Values of f are known for several calibration lines in the range of interest [14]. Summarizing, thanks to supplementary information on the emission probability f and on the product N inc ε, we can state that some selected peak areas of the 48 Ca(n,γ) spectrum are known functions of the capture cross-section.…”

Section: Experimental Setup and Results For Thermal Neutron Capturementioning

confidence: 99%

Measurement of neutron capture onCa48at thermal and thermonuclear energies

Beer¹,

Coceva²,

Sedyshev

et al. 1996

Phys. Rev. C

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At 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 CaCO3 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.

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Section: Experimental Setup and Results For Thermal Neutron Capturementioning

confidence: 99%

Measurement of neutron capture onCa48at thermal and thermonuclear energies

Beer¹,

Coceva²,

Sedyshev

et al. 1996

Phys. Rev. C

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“…The relative intensities of 23 prompt γ-rays normalized by the 1951.1 keV γ-ray from 35 Cl(n, γ) 36 Cl reaction have been determined on the filtered thermal neutron beam at the Dalat research reactor. The present results were compared with literature values from the ENSDF library [10] and data from previous measurements [13][14][15] as shown in Table 2. ∑ I k is sum of relative intensities andσ I k is average of relative intensity uncertainties; Present(a) -using experimental efficiencies; Present(b) -using calculated efficiencies.…”

Section: Resultsmentioning

confidence: 99%

“…In Table 2, 24 strong gamma lines from 0.5 -8.5 MeV were chosen to determine relative intensities. The authors Coceva [13], Raman [15] and Molnar [14] have measured prompt gamma rays of 36 Cl on the high thermal and cold neutron beams by using a Compton-suppressed spectrometer. The detector efficiencies in a high energy region were determined by measuring 14 N(n, γ) 15 N reaction while the present experiment only used a HPGe spectrometer in a single mode.…”

Section: Resultsmentioning

confidence: 99%

Determination of \(\gamma\)-rays Relative Intensities from the \(^{35}\)Cl\((n, \gamma )^{36}\text{Cl}\) Reaction on Filtered Thermal Neutron Beam

Anh¹,

Tan²

2016

Comm. in Phys.

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The relative intensities of prompt g-rays from the 35Cl(n, g)36Cl reation with thermal neutron have been used as secondary g-ray intensity standards for the prompt gamma neutron activation analysis (PGNAA) and for nuclear data measurements due to a high capture cross section. The filter neutron technique was applied for producing a thermal neutron beam at the neutron channel No. 4 of the Dalat nuclear research reactor. The neutron flux and Cd-ratio are 8.72 ´ 106 n.cm-2.s-1and 134, respectively, determined by the gold foil activation method. A new PGNAA system with a HPGe detector of 58% relative efficiency and a digital spectrometer was used to detect prompt gamma rays from the 35Cl(n, g)36Cl reaction. In this work, relative intensities of 23 prompt g-rays have been determined on the filtered thermal neutron beam. The present results within accuracy 3.0% or better are in good agreement with literature values and data from previous measurements.

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“…The spectra were calibrated for energy using well-knows lines from 35 Cl, 60 Co, 137 Cs, and 12 C [13][14][15]. The efficiency calibration was achieved with calibrated gamma-ray emitter standards 60 Co, 137 Cs, 152 Eu of defined absolute activity.…”

Section: Hpge Detectormentioning

confidence: 99%