Direct processes in (n, α) reactions

Kulišić, P.; Cindro, N.; Strohal, P.; Lalović, B.

doi:10.1016/0029-5582(65)90700-5

Cited by 32 publications

(4 citation statements)

References 29 publications

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“…A value of 2.2 ± 0.5 mb was, however, reported for the total (n, at) cross section via integration of the differential data [1]. Our value is in agreement with that Brought to you by | University of California Authenticated Download Date | 6/13/15 7:01 AM value.…”

Section: Resultssupporting

confidence: 92%

Activation Cross Sections of (n,α) Reactions at 14.7 MeV in the Region of Rare Earths

Qaim

1984

Radiochimica Acta

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Cross sections for (n, a) reactions at 14.7 ± 0.3 MeV on twentyfive stable nuclei of the elements lanthanum, cerium, neodymium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, lutetium and hafnium have been measured by the activation technique using high-pressure liquid chromatography and high-resolution 7-ray spectroscopy. The cross section shows a strong dependence on the relative neutron excess (N-Z)/A of the target nucleus. Hauser-Feshbach calculations show that the contributions of statistical processes to the total (n, a) cross section are small.

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Section: Resultssupporting

confidence: 92%

Activation Cross Sections of (n,α) Reactions at 14.7 MeV in the Region of Rare Earths

Qaim

1984

Radiochimica Acta

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“…Nevertheless, we performed comprehensive theoretical calculations of its isomer's population, and reached agreement with existing experimental data [22][23][24]. Also calculations show that exclusive channels such as (n, d), (n, np), (n, t), and (n, 2p) are open at neutron energy 14.6 MeV for terbium, which could be the next step in further research.…”

Section: B Cross Sections Of Tbsupporting

confidence: 72%

“…In the article of Qaim [23] the upper cross-section estimate is denoted as 0.3 mb. Measurements of such rare processes are quite complicated because of their small value against a background of (n,2n) and (n,γ ) [29] 0.41(4) [16] 0.33(6) [22] 0.37 181 Ta(n,γ ) 182 Ta 0.017(2) [30] -0.02 reactions. Therefore, before the experiment the reaction yield was estimated and the cross section was precisely calculated with TALYS-1.0 (Fig.…”

Section: B Cross Sections Of Tbmentioning

confidence: 99%

Cross sections for fast-neutron interaction with Lu, Tb, and Ta isotopes

et al. 2010

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The cross sections for (n,x) reactions with Lu, Tb, and Ta isotopes were measured at (d,t) neutron energies around 14 MeV with the activation technique using metal foils of natural composition. Additionally, tantalum samples were irradiated with (d,d) neutrons and filtered neutron beams. To ensure an acceptable precision of the results all major sources of uncertainties were taken into account. Calculations of efficiency and correction factors were performed with the Monte Carlo technique. The cross section results obtained for the 175 Lu(n,α) 172 Tm reaction at (d,t) neutron energies are reported for the first time. 181 Ta(n,γ ) 182 Ta m2 reaction cross sections were also measured for the first time at 1.9, 58.7, and 144.3 keV and at 2.85 MeV. The earlier evaluated cross section upper estimate for the nuclear reaction 159 Tb(n,n α) 155 Eu is reported in this article to be one order lower. Some other cross sections were obtained with higher precision. Theoretical calculations of excitation functions were performed with the TALYS-1.0 code and compared with the experimental cross section values.

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“…These have energies greatly exceeding the Coulomb barrier and are strongly forward-peaked. This emission is quite notable already for A z 90 nuclei (Haight et a1 1981, Gadioli et a/ 1986a, Kumabe et a/ 1987), and becomes the dominant contribution in the case of heavier nuclei where statistical evaporation of a particles is strongly inhibited by the Coulomb barrier (Marcazzan et a1 1963, Kulisic et al 1965, Rubbino and Zubke 1966, Milazzo Colli and Braga Marcazzan 1973a, b, Glowacka et a1 1975, Augustinyak et a/ 1985a. The gross features of this hard component to the a-particle spectrum are reproduced by calculations based either on pre-equilibrium models or one-step and multi-step direct reaction theory as will be discussed in 545.2-3.…”

Section: Spectramentioning

confidence: 95%

Nucleon-alpha reactions in nuclei

Gadioli

Hodgson

1989

Rep. Prog. Phys.

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The experimental data on nucleon-alpha reactions to discrete and continuum states are reviewed, together with the theories that have been proposed to account for them. At low energies the compound-nucleus mechanism predominates, and as the energy increases the pre-equilibrium and direct processes become more likely. These theories are described and the results of typical calculations compared with the experimental data. Particular attention is devoted to J-dependent and spectator effects, and to the competition between the triton pick-up and alpha knock-out mechanisms.

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Direct processes in (n, α) reactions

Cited by 32 publications

References 29 publications

Activation Cross Sections of (n,α) Reactions at 14.7 MeV in the Region of Rare Earths

Activation Cross Sections of (n,α) Reactions at 14.7 MeV in the Region of Rare Earths

Cross sections for fast-neutron interaction with Lu, Tb, and Ta isotopes

Nucleon-alpha reactions in nuclei

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