Excitation functions of α-induced reactions on gold for α-particle energies between 11 and 36 MeV

Necheva, C.; Kolev, D.

doi:10.1016/s0969-8043(96)00277-1

Cited by 12 publications

(4 citation statements)

References 14 publications

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“…Above this energy the cross section increases rapidly. Most of the previously mentioned studies of the (α,n) reaction investigated also this reaction channel, and there are a few others [28,[30][31][32][33][34][35][36][37][38]. Similarly to the (α,n) channel the literature data are in good agreement within their error bars, but they have limited precision.…”

Section: B 197 Au(αn) 200 Tlmentioning

confidence: 91%

“…197 Au(α,γ) 201 Tl There is only one cross-section dataset for this reaction in the literature by Basunia et al [28] and several derived upper limits [29][30][31]. Even if Capurro et al [29] published their data as definite values, they can only be considered as upper limits because of some neglected experimental issues as pointed out by Necheva et al [30]. The weak γ transition at 167.4 keV of 201 Tl is often buried by the Compton background of the strong 367.9-keV γ line from the (α,n) reaction product.…”

Section: Studied Reactionsmentioning

confidence: 99%

“…There are many datasets in the literature for this reaction [28,[30][31][32][33][34][35][36][37]. Almost all of these works used the stacked foil technique to measure the reaction cross section at different energies, the only exception is Calboreanu et al [33].…”

Section: B 197 Au(αn) 200 Tlmentioning

confidence: 99%

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Cross section of α -induced reactions on Au197 at sub-Coulomb energies

et al. 2019

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Background: Statistical model calculations have to be used for the determination of reaction rates in large-scale reaction networks for heavy-element nucleosynthesis. A basic ingredient of such a calculation is the α-nucleus optical model potential. Several different parameter sets are available in literature, but their predictions of α-induced reaction rates vary widely, sometimes even exceeding one order of magnitude.Purpose: This paper presents the result of α-induced reaction cross-section measurements on gold which could be carried out for the first time very close to the astrophysically relevant energy region. The new experimental data are used to test statistical model predictions and to constrain the α-nucleus optical model potential.Method: For the measurements the activation technique was used. The cross section of the (α,n) and (α,2n) reactions was determined from γ-ray counting, while that of the radiative capture was determined via X-ray counting. Results:The cross section of the reactions was measured below Eα = 20.0 MeV. In the case of the 197 Au(α,2n) 199 Tl reaction down to 17.5 MeV with 0.5-MeV steps, reaching closer to the reaction threshold than ever before. The cross section of 197 Au(α,n) 200 Tl and 197 Au(α,γ) 201 Tl was measured down to Eα = 13.6 and 14.0 MeV, respectively, with 0.5-MeV steps above the (α,2n) reaction threshold and with 1.0-MeV steps below that. Conclusions:The new dataset is in agreement with the available values from the literature, but is more precise and extends towards lower energies. Two orders of magnitude lower cross sections were successfully measured than in previous experiments which used γ-ray counting only, thus providing experimental data at lower energies than ever before. The new precision dataset allows us to find the best-fit α-nucleus optical model potential and to predict cross sections in the Gamow window with smaller uncertainties.

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Section: B 197 Au(αn) 200 Tlmentioning

confidence: 91%

Section: Studied Reactionsmentioning

confidence: 99%

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Cross section of α -induced reactions on Au197 at sub-Coulomb energies

et al. 2019

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“…In order to make a comparative study of the measured data the literature data for the same reaction measured by Elmaghraby, 18 Gritsyna et al, 19 Thomas, 20 Szelecsenyi, 21 Singh. 22 Bhardwaj, 23 Ismail, 24 Mukherjee, 25 Shah, 26 Calboreanu, 27 Basunia, 28 Necheva, 29 Capurro, 30 Singh, 31 Kurz, 32 Chakravarthy, 33 Kulko, 34 Lanzafame, 35 Vandevijver, 36 and Vinciguerra 37 are also plotted in Figs. 1-8. In the present case a number of isotopes having isomeric states of measurable half lives of the order of few minutes to few days are produced.…”

Section: Theoretical Analysismentioning

confidence: 99%

STUDY OF ISOMERIC CROSS-SECTION RATIO AND PRE-EQUILIBRIUM FRACTION IN PROTON AND ALPHA PARTICLE INDUCED NUCLEAR REACTIONS ON ¹⁹⁷Au

Satheesh

Musthafa

Singh

et al. 2012

Int. J. Mod. Phys. E

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Excitation functions for the reactions 197 Au(p,n) 197g Hg and 197 Au(p,n) 197m Hg have been measured over the energy ranges from threshold up to 20 MeV using stacked foil activation technique. The isomeric cross-section ratio σm/(σm + σg) for the formation of 197g,m Hg was determined. The excitation functions and isomeric cross-section ratios were calculated for the reactions 197 Au(p,n) 197g,m Hgα,5n) 196g,m Tl from reaction threshold up to 40 MeV for proton induced reactions and 80 MeV for alpha induced reactions. The results were compared with the theoretical cross-sections calculated by means of the code EMPIRE-II and with the available literature data, which makes use of the Hauser Feshbach model for the compound nuclear calculations and the exciton model for the pre-equilibrium emission part. The isomeric cross-section ratio is found to depend strongly on the relative spins of the isomeric and ground state, energy difference between the levels, presence of intermediate states and some dependence on decay modes and on the onset of pre-equilibrium emission.

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Extension of evaluated cross section database for charged particle monitor reactions

Tárkányi,

Hermanne,

Ignatyuk

et al. 2024

J Radioanal Nucl Chem

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The evaluation and deduction of recommended cross section values allowing extension of the database to monitor energy and intensity parameters of charged particle beams is presented. Included are 53 charged particle (p, d, 3He, 4He) induced reactions on suited C, Al, Ti, Fe, Ni, Cu, Nb and Au targets. The new data allow more systematic simultaneous use of multiple reactions on the same target and promote the backings of electrodeposited and sedimented targets as monitoring aids. Where possible the energy range is extended to above 100 MeV. Integral yield curves over the studied energy range are derived and compared to experimentally measured yields at specific energy points. A comparison with the theoretical excitation curve prediction of the TALYS-code as available in the TENDL 2021–2023 libraries is shown.

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Excitation functions of α-induced reactions on gold for α-particle energies between 11 and 36 MeV

Cited by 12 publications

References 14 publications

Cross section of α -induced reactions on Au197 at sub-Coulomb energies

Cross section of α -induced reactions on Au197 at sub-Coulomb energies

STUDY OF ISOMERIC CROSS-SECTION RATIO AND PRE-EQUILIBRIUM FRACTION IN PROTON AND ALPHA PARTICLE INDUCED NUCLEAR REACTIONS ON ¹⁹⁷Au

Extension of evaluated cross section database for charged particle monitor reactions

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Excitation functions of α-induced reactions on gold for α-particle energies between 11 and 36 MeV

Cited by 12 publications

References 14 publications

Cross section of α -induced reactions on Au197 at sub-Coulomb energies

Cross section of α -induced reactions on Au197 at sub-Coulomb energies

STUDY OF ISOMERIC CROSS-SECTION RATIO AND PRE-EQUILIBRIUM FRACTION IN PROTON AND ALPHA PARTICLE INDUCED NUCLEAR REACTIONS ON 197Au

Extension of evaluated cross section database for charged particle monitor reactions

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STUDY OF ISOMERIC CROSS-SECTION RATIO AND PRE-EQUILIBRIUM FRACTION IN PROTON AND ALPHA PARTICLE INDUCED NUCLEAR REACTIONS ON ¹⁹⁷Au