Absolute yield and spectrum of neutrons from the7Li(p,n)7Be reaction

Kononov, V.N.; Poletaev, E.D.; Yurlov, B.D.

doi:10.1007/bf01118014

Cited by 21 publications

(18 citation statements)

References 1 publication

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“…While the individual results are in fair agreement within the quoted uncertainties for 152 30 Beer and Macklin [6] 997 ± 62 Beer et al [31] t54Gd 1028 ± 12 present work 1 1278 ± 102 878 ± 27 878 ± 27 Beer and Macklin [6] 1184 ± 94 Shorin et al [28] 155Gd 2648 ± 30 present work 1 2800 ± 280 2721 ± 90 2990 ± 150 N akajima et al [32) 2721 ± 90 Beer and Macklin [6] 2595 ± 260 Shorin et al [28) Kononov et al [33) t57Gd 1369 ± 15 present work 1 …”

supporting

confidence: 86%

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Stellar neutron capture cross sections of the Gd isotopes

Wisshak¹,

Voß²,

Käppeler³

et al. 1995

Phys. Rev. C

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The neutron capture cross sections of 152 Gd, 154 Gd, 155 Gd, 156 Gd, 157 Gd, and 158 Gd were measured in the energy range from 3 to 225 keV at the Karlsruhe 3.75 MV Van de Graaff accelerator. Neutrons were produced via the 7 Li(p,n)1Be reaction by bombarding metallic Li targets with a pulsed protori beam. Capture events were registered with the Karlsruhe 47r Barium Fluoride Detector, which was improved by replacing crystals with high a background and by introducing a pierced crystal at zero degrees with respect to the beam axis. These changes resulted in a significantly increased efficiency for capture events. The main experimental problern was that the samples of the two s-only isotopes 152 Gd and 154 Gd showed only relatively low enrichment, but the spectroscopic quality of the BaF 2 detector allowed to determine the resulting corrections for isotopic impurities reliably. The cross section ratios could be determined with an overall uncertainty of typically 1%, an improvement by factors of five to ten compared to existing data. Severe discrepancies were found with respect to previous results. Maxwellian averaged neutron capture cross sections were calculated forthermal energies between kT = 10 keV and 100 keV. The new stellar cross sections were used for an updated analysis of the s-process reaction flow in the mass region between samarium and gadolinium, which is characterized by branchings at 151 Sm, 154 Eu, and 155 Eu. With the classical approach, the s-process temperature could be constrained corresponding to a range of thermal energies between kT=28 ke V and 33 keV. The 152 Gd production in low mass starswas found to depend strongly on the neutron freeze-out at the end of the heliumshell burning episodes.

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supporting

confidence: 86%

“…221 ± 20 304 ± 20 Bokhovko et al [34] 211 ± 19 Beer et al [31) 392 ± 39 Kononov et al [33] 477 ± 292 Thirumala et al [35] 523 ± 60 Stupegia et al [36] …”

Section: ± 154mentioning

confidence: 99%

Stellar neutron capture cross sections of the Gd isotopes

Wisshak¹,

Voß²,

Käppeler³

et al. 1995

Phys. Rev. C

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“…Our data show perfect agreement with Kazakov et al [39] and the evaluations and are also still in fair agreement with Refs. [2][3][4][40][41][42][43][44].…”

Section: A Comparison With Evaluations and Previous Datamentioning

confidence: 99%

Au197(n,γ) cross section in the unresolved resonance region

Lederer¹,

Colonna²,

Domingo‐Pardo³

et al. 2011

Phys. Rev. C

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“…Our spectrum agrees with the measured ones except for the broader low-and high-energy tails observed by Feinberg et al [13] which is due to the relatively thick 6 Li-glass detector and its effects on the time-of-flight resolution according to them. Figure 2 shows the 0 • double-differential neutron spectra at E p =1940 keV calculated by us and measured Li(p,n 0 ) 7 Be double-differential neutron spectrum at E p =1940 keV for various angular coverage with experimental spectrum [15]. by Kononov et al [15] taken from EXFOR.…”

Section: Comparison Between Epen and Experimental Resultsmentioning

confidence: 95%

“…Figure 2 shows the 0 • double-differential neutron spectra at E p =1940 keV calculated by us and measured Li(p,n 0 ) 7 Be double-differential neutron spectrum at E p =1940 keV for various angular coverage with experimental spectrum [15]. by Kononov et al [15] taken from EXFOR. It shows a mismatch of the peak position by 5 keV between our spectrum (solid line) and Kononov's spectrum.…”

Section: Comparison Between Epen and Experimental Resultsmentioning

confidence: 95%

A tool for calculation of ⁷Li(p,n)⁷Be neutron source spectra below the three-body break-up reaction threshold

et al. 2017

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Abstract. We developed a new deterministic neutron source spectrum code EPEN -Energy of Proton Energy of Neutron -for a given lithium target thickness, sample angular coverage and proton energy from the reaction threshold to the three-body break-up threshold. The angular differential cross sections of the 7 Li(p,n 0 ) 7 Be and 7 Li(p,n 1 ) 7 Be reactions evaluated by Liskien and Paulsen were adopted above 1.95 MeV while the functional form suggested by Macklin and Gibbons was adopted for the 7 Li(p,n 0 ) 7 Be reaction cross section near threshold. The spectra obtained by EPEN are validated by the experimental spectra and also compared with the spectra predicted by two Monte Carlo codes, SimLiT and PINO. The results of comparison are discussed in detail.

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Absolute yield and spectrum of neutrons from the7Li(p,n)7Be reaction

Cited by 21 publications

References 1 publication

Stellar neutron capture cross sections of the Gd isotopes

Stellar neutron capture cross sections of the Gd isotopes

Au197(n,γ) cross section in the unresolved resonance region

A tool for calculation of ⁷Li(p,n)⁷Be neutron source spectra below the three-body break-up reaction threshold

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Absolute yield and spectrum of neutrons from the7Li(p,n)7Be reaction

Cited by 21 publications

References 1 publication

Stellar neutron capture cross sections of the Gd isotopes

Stellar neutron capture cross sections of the Gd isotopes

Au197(n,γ) cross section in the unresolved resonance region

A tool for calculation of 7Li(p,n)7Be neutron source spectra below the three-body break-up reaction threshold

Contact Info

Product

Resources

About

A tool for calculation of ⁷Li(p,n)⁷Be neutron source spectra below the three-body break-up reaction threshold