Thermal-neutron cross sections and resonance integrals of 138Ba and 141Pr using Am-Be neutron source

Panikkath, Priyada; Mohanakrishnan, P.

doi:10.1140/epja/i2016-16276-9

Cited by 10 publications

(3 citation statements)

References 33 publications

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“…The neutron spectrum has a mixed component including thermal and epithermal neutrons. Details of the neutron source facility and the spectrum are available in our previous publications [16][17][18]. Analytical grade Ga 2 O 3 powder of Alfa Aesar with purity of 99.995% was prepared in small packets.…”

Section: Methodsmentioning

confidence: 99%

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Covariance analysis on the thermal neutron capture cross sections using an Am-Be neutron source

2020

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We measured the thermal cross sections of 71Ga(n, γ)72Ga using an Am-Be neutron source having strength of 4 × 107 neutrons/sec using the two monitor reactions 197Au(n, γ)198Au and 55Mn(n, γ)56Mn, and obtained 4.07±0.27 b and 3.97±0.31 b as the values measured relative to Au and Mn neutron captures, respectively. We constructed their covariance matrix by taking into account the correlation of parameters which are not independent in derivation of these two thermal cross sections (e.g., Ga sample weight, decay data of 72Ga, detector efficiency of γ -ray emitted from 72Ga). The off-diagonal weighted mean of the two cross sections 4.04±0.27 b was derived from the two thermal cross sections and their covariance matrix.

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Section: Methodsmentioning

confidence: 99%

“…[ 16,17,26] where G th is the thermal self-shielding factor, g is the Westcott factor, and σ 0,M is the neutron capture thermal cross section of the monitor foil. The self-shielding factor G th was estimated analytically as in Ref.…”

Section: Data Reductionmentioning

confidence: 99%

Covariance analysis on the thermal neutron capture cross sections using an Am-Be neutron source

2020

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“…x Cd,epi, gives a value greater than 1. Value of ¢ F Cd,epi,Au =1.009 [18,37,38] is used to normalize the activity (reciprocal to flux) which increases with cadmium thickness; while F Cd,epi,Au =0.991 decreases with cadmium thickness as mentioned in several works [33,[39][40][41]. Some researchers still use the ratio with old defined parameters [42].…”

Section: Modulated Fieldmentioning

confidence: 99%

Role of isomeric state formation on the measurement of thermal neutron cross section and resonance integral

Elmaghraby¹,

Salem²,

Yousef³

et al. 2018

Phys. Scr.

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The isomeric thermal neutron cross section and isomeric resonance integral of 109 Ag(n, γ) 110m Ag, 133 Cs(n, γ) 134m Cs and 134g Cs, and 136 Ba(n, γ) 137m Ba reactions were investigated together with 115 In(n, γ) 116m In monitor reaction. These residual nuclei have broad half-life time scale suitable for our investigation. Moderated neutrons from steady AmBe source were used for activation of samples with natural abundances. Field was monitored and mapped using gold and indium activation. The formulae used for neutron activation analysis were derived with emphasizing the different interpenetrations of cadmium transmission factor and self-shielding factors. The k 0 -factor for γ-rays in the residual nuclei were measured. The isomeric thermal neutron cross section and resonance integral for 115 In(n, γ) 116m In were evaluated to be 162.6 b and 2585 b. These data were used to measure the k 0 -factors; and compared to reported values to confirm the procedure. The thermal neutron cross section and resonance integral for 133 Cs(n, γ) 134m Cs were found to be 2.64±0.11 b and 42±1.7 b, respectively; while those of the 109 Ag(n, γ) 110m Ag reaction were 4.09±0.35 b and 68±6 b. Thermal neutron cross section for 136 Ba(n, γ) 137m Ba was identified as 0.032±0.003 b, while the resonance integral could not be evaluated as a result of interfering reactions. Model calculations were done using EMPIRE code to simulate isomeric ratio and compared with the experimental results. The feeding of isomeric state from neutron reaction is more sensitive to the variation of neutron flux distribution than the nucleus formation. Steady neutron field could be retained with isotopic neutron source with moderation setup and geometry of suitable homogeneity and isotropy.

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Thermal neutron capture cross sections and resonance integrals of ruthenium isotopes- 96Ru, 102Ru and 104Ru

Panikkath

2019

Applied Radiation and Isotopes

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Thermal-neutron cross sections and resonance integrals of 138Ba and 141Pr using Am-Be neutron source

Cited by 10 publications

References 33 publications

Covariance analysis on the thermal neutron capture cross sections using an Am-Be neutron source

Covariance analysis on the thermal neutron capture cross sections using an Am-Be neutron source

Role of isomeric state formation on the measurement of thermal neutron cross section and resonance integral

Thermal neutron capture cross sections and resonance integrals of ruthenium isotopes- 96Ru, 102Ru and 104Ru

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