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Cowley, A.A.; Arendse, G. J.; Steyn, G. F.; Stander, J. A.; Richter, W. A.; Dimitrova, S. S.; Demetriou, P.; Hodgson, P. E.

doi:10.1103/physrevc.55.1843

Cited by 17 publications

(19 citation statements)

References 15 publications

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“…This is a general feature of multistep calculations, as was also found in our previous work [8][9][10][11]15]. Although the actual step which is dominant at a specific emission energy only influences the shape of the cross section relatively slightly, an appreciable contribution of higher steps affects the analyzing power distribution profoundly.…”

Section: B Analyzing Power Distributionsmentioning

confidence: 57%

“…Although comparisons between experimental and theoretical analyzing power results suggest that this is not a serious concern, it would be advisable to investigate the lower-than-expected theoretical cross sections further. Based on the trend from comparable (p, 3 He) [8][9][10][11] and (p,α) [14,15] studies in the 100 MeV to 200 MeV incident-energy range, it is reasonable to speculate that the issue which is encountered in the magnitude of the predicted cross section is mainly related to problems with proton-induced multi-nucleon transfer reactions in general. For example, it is well known that severe momentum mismatch in (p,α) reactions to discrete final states makes it difficult, if not impossible, to extract spectroscopic information.…”

Section: Discussionmentioning

confidence: 99%

“…As in our previous studies on (p, 3 He) processes [8][9][10][11], we assume that this type of reaction occurs in a series of intranuclear N -N steps preceding a final process in which the α particle is emitted. The single step direct reaction can be a knockout of an α cluster or a pickup of a triton.…”

Section: Theoretical Analysismentioning

confidence: 99%

“…In earlier work on proton-induced emission of 3 He into the continuum, we attempted to identify the simplest dominant reaction process in the incident energy range below 200 MeV [8][9][10][11]. Because analyzing power angular distributions are more sensitive to details of the reaction mechanism than those of the cross section, polarized projectiles proved to be especially valuable for these studies.…”

Section: Introductionmentioning

confidence: 99%

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Pre-equilibrium mechanisms in theNb93(p⃗,α)inclusive reaction at incident energies from 65 to 160 MeV

Dimitrova

Cowley²,

Zemlyanaya³

et al. 2014

Phys. Rev. C

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The reaction mechanism of pre-equilibrium proton-induced α-particle emission from 93 Nb at an incident energy of 100 MeV was investigated with polarized projectiles. A formalism based on the statistical multistep direct emission model of Feshbach, Kerman and Koonin was found to give a reasonably good reproduction of cross section and analyzing power angular distributions at various emission energies. Existing experimental distributions for the same reaction at an incident energy of 65 MeV were also analyzed with the same model. The incident-energy variation from 65 MeV up to 160 MeV was found to be consistent with the predictions of the basic model. However, whereas knockout of an α cluster is the dominant reaction mechanism in the final stage at the lowest-and highest incident energies, at 100 MeV a pickup process competes with comparable intensity in yield.

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Section: B Analyzing Power Distributionsmentioning

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Theoretical Analysismentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Pre-equilibrium mechanisms in theNb93(p⃗,α)inclusive reaction at incident energies from 65 to 160 MeV

Dimitrova

Cowley²,

Zemlyanaya³

et al. 2014

Phys. Rev. C

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“…Another comparison, this time of the two reactions 59 Co(p, 3 Hex) [15] and nat Fe(n, 3 Hex) [13] are shown in figure 2. However, in this case not only are the targets and projectiles different, but the incident energy is 160 MeV for the proton-induced reaction and 175 MeV for the neutron projectile.…”

Section: Some General Features Of Pre-equilibrium Distributionsmentioning

confidence: 99%

Proton-induced composite particle emission in inclusive reactions in the range of 100 to 200 MeV

Cowley

2012

EPJ Web of Conferences

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Abstract. Nucleon-induced inclusive reactions at incident energies in the 100 to 200 MeV range, in which light composite particles are emitted, are of special interest. For emission of α-particles into the continuum, it appears that the yield is enhanced towards lower outgoing energies of the ejectile compared with the value predicted by a multistep model. We postulate that a simple reaction mechanism, such as sequential decay from inelastic excitation, should be investigated more carefully as a possible explanation of the observed phenomenon. The motivation for this is that the suggested mechanism is a process which is observed in several (p, pα) knockout studies.

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Analysis of (p, α) and (p,3He) cross-sections to continuum states by the Feshbach-Kerman-Koonin multistep direct theory

1997

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Summary. -The cross-sections of several p; and p;3 He reactions at high energies to continuum states are analysed in order to obtain information on clustering in nuclei. -IntroductionThe presence of clusters of nucleons inside nuclei greatly enhances the cross-sections of cluster knockout and transfer reactions. It is therefore useful to study such reactions in order to determine the probabilities of various possible types of clusters.The most probable cluster in nuclei is the alpha-particle, due to its high symmetry and binding energy. Alpha-transfer and alpha knockout reactions have therefore been extensively studied in order to determine the alpha-clustering probability [1,2].One of the reactions most frequently used to study alpha-clustering in nuclei is the p; reaction, and many analyses of the differential cross-sections and analysing powers of this reaction to discrete states have been made [3] using either the triton pick-up or the alpha-particle knock-out models. Both models give rather similar results [5,4], but nuclear structure arguments favour the pick-up model. For a long time the calculations gave absolute magnitudes for the cross-section that were far too low [6,7] but detailed analyses [8] have largely removed the discrepancy, although some difficulties still remain [9].

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Inclusive(p,3He) reactions on59Co and

Cited by 17 publications

References 15 publications

Pre-equilibrium mechanisms in theNb93(p⃗,α)inclusive reaction at incident energies from 65 to 160 MeV

Pre-equilibrium mechanisms in theNb93(p⃗,α)inclusive reaction at incident energies from 65 to 160 MeV

Proton-induced composite particle emission in inclusive reactions in the range of 100 to 200 MeV

Analysis of (p, α) and (p,3He) cross-sections to continuum states by the Feshbach-Kerman-Koonin multistep direct theory

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