Optical model and DWBA analysis of the α-particle scattering for the nuclei26Mg and28,30Si including Hauser-Feshbach contributions

Wühr, W.; Hofmann, A.; Philipp, G.

doi:10.1007/bf01668608

Cited by 31 publications

(9 citation statements)

References 21 publications

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“…This is also confirmed by the analysis of 30 Si(α,α) 30 Si elastic scattering at 15.7 MeV [109]. The analysis of the EXFOR data leads to a relatively high σ red = 68.7 mb at E red = 2.32 MeV.…”

Section: 23supporting

confidence: 69%

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Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Mohr

2015

Eur. Phys. J. A

100

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Abstract. A simple reduction scheme using so-called reduced energies E red and reduced cross sections σ red allows the comparison of heavy-ion induced reaction cross sections for a broad range of masses of projectile and target and over a wide energy range. A global behavior has been found for strongly bound projectiles whereas much larger reduced cross sections have been observed for weakly bound and halo projectiles. It has been shown that this simple reduction scheme works also well for α-particle induced reactions on heavy target nuclei, but very recently significant deviations have been seen for α+ 33 S and α+ 23 Na. Motivated by these unexpected discrepancies, the present study analyses α-induced reaction cross sections for targets with masses A ≈ 20 − 50. The study shows that the experimental data for α-induced reactions on nuclei with A ≈ 20 − 50 deviate slightly from the global behavior of reduced cross sections. However, in general the deviations evolve smoothly towards lower masses. The only significant outliers are the recent data for 33 S and 23 Na which are far above the general systematics, and some very old data may indicate that 36 Ar and 40 Ar are below the general trend. As expected, also the doubly-magic 40 Ca nucleus lies slightly below the results for its neighboring nuclei. Overall, the experimental data are nicely reproduced by a statistical model calculation utilizing the simple α-nucleus potential by McFadden and Satchler. Simultaneously with the deviation of reduced cross sections σ red from the general behavior, the outliers 23 Na, 33 S, 36 Ar, and 40 Ar also show significant disagreement between experiment and statistical model calculation.PACS. 25.55.-e 3H-, 3He-, and 4He-induced reactions -24.10.Pa Thermal and statistical models

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Section: 23supporting

confidence: 69%

“…The analysis of the EXFOR data leads to a relatively high σ red = 68.7 mb at E red = 2.32 MeV. However, the χ 2 /F of the phase shift fit can be reduced by about a factor of three if the experimental data of [109] are scaled by a factor of ≈ 0.6, leading to a lower value of σ red = 61.2 mb.…”

Section: 23mentioning

confidence: 95%

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Mohr

2015

Eur. Phys. J. A

100

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“…The α-evaporation channels leading to the daughter nuclei 27 Al, 29 Si, 30 Si, and 30 P account for 75% of the total fusion cross section. The α-energy spectra, calculated at a laboratory angle of 27 • with a Monte Carlo simulation via the code MECO, are compared with the data in Fig.…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

“…Optical model calculations with this effective potential give results very close to full CDCC calculations. The exit channel potential, 5 He + 30 P, was generated from the empirical n-30 P and α-30 P optical potential [27], which was folded with the 5 He groundstate wave function (cluster-folding method). The geometry of the 5 He + d potential was taken as that predicted by Buck and Merchant [28] for α + t. Spectroscopic amplitudes were taken from Nemets et al [29]; spectroscopic amplitudes for the different states of the final nucleus are from de Meijer et al [30].…”

Section: Analysis Of the Resultsmentioning

confidence: 99%

α-particle production: Direct and compound contribution in the reactionLi7+Si28at near-barrier energies

et al. 2005

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The production of α particles in the 7 Li + 28 Si reaction was studied at near-barrier energies. Angular distributions were measured at four energies, namely 9, 10, 11, and 13 MeV. The data were treated in a statistical model and DWBA framework to disentangle the degree of competition between direct and compound channels in the reaction and its energy evolution near the barrier. It was found that whereas the compound mechanism is substantial, d transfer and possibly t transfer are the dominant mechanism at near-barrier energies. The influence of the reaction channels on the optical potential threshold anomaly is discussed.

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“…The a parameters which were assumed to be energy independent, were taken from references [16] and [17]. All [19] and were otherwise extrapolated from the tabulated values.…”

mentioning

confidence: 99%

Complete identification of products of the reaction 20Ne + 12C at 110 Mev

et al. 1977

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Optical model and DWBA analysis of the α-particle scattering for the nuclei26Mg and28,30Si including Hauser-Feshbach contributions

Cited by 31 publications

References 21 publications

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

Cross sections of α-induced reactions for targets with masses A ≈ 20–50 at low energies

α-particle production: Direct and compound contribution in the reactionLi7+Si28at near-barrier energies

Complete identification of products of the reaction 20Ne + 12C at 110 Mev

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