Reactions of 51V and 27Al with 7–120 MeV α-particles (equilibrium and non-equilibrium statistical analyses)

Bowman, W.W.; Blann, M.

doi:10.1016/0375-9474(69)90592-2

Cited by 73 publications

(21 citation statements)

References 38 publications

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“…Earlier data by Vlieks et al [55] are slightly higher especially at energies above 9 MeV. Recent stackedfoil data by Peng et al [11] and Chowdhury et al [12] are in good agreement with the other data whereas earlier stacked-foil data [59,60,61,62,63,64] deviate significantly at the lowest energies. The agreement of the experimental data with the StM calculation is excellent over the full shown energy range.…”

Section: Vmentioning

confidence: 61%

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: Vmentioning

confidence: 61%

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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“…E~<120MeV with x<7 and y<4 by Bowman and Blann [4]. On the heavy mass side, the data on lS7Au+e up to 103MeV by Kurz et al [5] and Lanzafame et al [6] have been extended by Djaloeis et al [7] up to t70MeV.…”

Section: Sw(e Xnyp) Reactions Have Been Investigated Formentioning

confidence: 89%

“…The experimental procedure was similar to that employed in previous work at the Jiilich (JULIC) [1][2][3][4][5][6][7] and Bonn (BICYCL) 1-18] isochroneous cyclotrons, as well as at other accelerators [12]. Stacks of commercially supplied niobium and tantalum foils were irradiated in specially constructed chambers, the BK1 at JULIC [19] and the Faraday like gadget at BICYCL [20].…”

Section: General Informationmentioning

confidence: 99%

Investigation of ?-induced reactions on niobium and tantalum

et al. 1982

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Excitation functions of (c~,xnyp) reactions on 93Nb with y<6 and x<10 have been measured in four different irradiations from 16 to 171 MeV bombarding energy by Ge(Li) spectroscopy of the residual activity of stacked foils. Similarly, previous measurements of 18~Ta(c~, xn yp) reactions from 15 to 103 MeV were extended up to 170 MeV eenergy for residual nuclei with y<4 and x<12. Including isomeric states a total number of 37 residual activities could be identified in 93Nb+e. From the rather complex y-decay spectra altogether 28 different excitation functions of sizable length could be established. For 18XTa + ~ 10 different residual activities were analyzed so that together with the former data a set of 15 excitation functions is available. The whole set of excitation functions provides a large data basis for probing the validity of combined equilibrium and preequilibrium reaction models in a wide energy range. NuclearReactions: 93Nb(e, xn yp), E~ = 16-170.7 MeV, x ~ 10, y < 6, ISlTa(e, xnyp), x<12, y<4; measured a(E) by activation of stacked foils, natural targets.

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“…de Weisskopf [31]. Ces spectres sont ensuite utilisés [5,32] au calcul des sections efficaces suivant la méthode suivante :…”

Section: Comparaison Avec Les Résultats Du Modèle Deunclassified

Étude du mécanisme des réactions nucléaires induites par particules alpha de haute énergie II. Réactions 208Pb(α, xn) 212-xPo et 208 206Pb(α, pxn) Bi. noyau composé et mécanismes non composés

Bimbot

Beyec

1971

J. Phys. France

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Reçu le 4 janvier 1971) Résumé. 2014 Poursuivant l'étude du mécanisme des réactions nucléaires induites par des particules 03B1 sur des noyaux lourds [1], cet article donne les sections efficaces expérimentales mesurées entre 60 et 150 MeV pour les réactions 208Pb(03B1, xn) 212-xPo avec x = 6 à 12, ainsi que pour les réactions 206Pb(03B1, pxn) 209-xBi pour x = 3 et 4, et 208Pb(03B1, pxn) 211-xBi pour x = 5 et 6. Les reculs moyens suivant l'axe du faisceau ont également été mesurés pour les noyaux de 206Po produits par réactions 206Pb(03B1, 4 n) et 208Pb(03B1, 6 n). L'ensemble de ces résultats met en évidence la part prédominante prise par les mécanismes non composés à haute énergie. Cela se traduit par des valeurs faibles de la section efficace de formation du noyau composé, qui a été déterminée de 60 à 150 MeV en utilisant les résultats obtenus pour les réactions (03B1, xn). On montre en outre qu'il est très probable qu'une fraction importante de la fission observée quand on bombarde 206Pb par des particules 03B1 de haute énergie succède à des mécanismes non composés, et on donne une estimation de cette fraction. En ce qui concerne les processus non-composés, une comparaison est effectuée avec les résultats de l'application du modèle précomposé de Griffin, qui suppose une importante émission de nucléons au cours de l'établissement de l'équilibre thermodynamique caractérisant l'état de noyau composé. Un désaccord apparaît au-dessus de 80 MeV dont les raisons sont analysées. Enfin, reprenant l'idée de cascades (03B1, nucléons) déjà exprimée dans l'article [1], on montre la possibilité de collisions multiples, de la particule 03B1 avec les nucléons du noyau, qui pourrait apporter une explication satisfaisante des résultats expérimentaux, dont une seule collision (03B1, n) à la périphérie du noyau ne peut rendre compte.

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Reactions of 51V and 27Al with 7–120 MeV α-particles (equilibrium and non-equilibrium statistical analyses)

Cited by 73 publications

References 38 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

Investigation of ?-induced reactions on niobium and tantalum

Étude du mécanisme des réactions nucléaires induites par particules alpha de haute énergie II. Réactions 208Pb(α, xn) 212-xPo et 208 206Pb(α, pxn) Bi. noyau composé et mécanismes non composés

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