Photodisintegration of light and medium-weight nuclei at intermediate energies—IV photoproduction of 7Be and 11C from targets with masses up to 40

Napoli, V. di; Martins, J. B.; Rosa, G.; Salvetti, F.; Tavares, O.A.P.; Terranova, Maria Letizia; Carvalho, H. G. de

doi:10.1016/0022-1902(78)80336-4

Cited by 10 publications

(5 citation statements)

References 12 publications

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“…1a. The literature values for nat Si(γ, X) 7 Be [16], nat V(γ, X) 22 Na [18], 159 Tb(γ, X) 24 Na [21], and nat S(γ, X) 28 Mg [22] were not consistent with the present values shown in APPENDIX. The reason for the discrepancies is unclear, but the present values are consistent with a systematic variation with A t discussed below.…”

Section: E 0 -Dependence Of Yieldscontrasting

confidence: 74%

“…Closed circles represent the data from Refs. [16,29]. Crosses indicate the values from the Rudstam's empirical formula for spallation.…”

Section: A T -Dependence Of Yieldsmentioning

confidence: 99%

“…2 the measured yields of 7 Be, 10 Be, 22 Na, 24 Na and 28 Mg at E 0 ϭ 1000 MeV are plotted by open symbols as a function of A t ; the literature values reported by other research groups [16,17,19,20,29] are shown by closed ones. The error bars of the symbols indicate the ranges of scattering of the measured yields, Y(E0), as shown in Fig.…”

Section: A T -Dependence Of Yieldsmentioning

confidence: 99%

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Target-dependence of light fragment production in photonuclear reactions at intermediate energies

Matsumura¹,

Washiyama²,

Haba³

et al. 2000

Radiochimica Acta

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in irradiations with bremsstrahlung having maximum end-point energies up to 1200 MeV were measured by γ-ray spectrometry ( 7 Be, 22 Na, 24 Na and 28 Mg) and accelerator mass spectrometry ( 10 Be). The yields of heavier fragments, 39 Cl,43, 44m, 44g,46,47, 48 Sc, 59 Fe,and 56,57,58,60 Co, were also measured by γ-ray spectrometry in order to survey the relative contribution of fragmentation to spallation and/or fission in the mass yield curves. A distinct difference of the target massdependence of these yields has made it possible to disentangle the contributions of photospallation and photofragmentation processes. It was found that the neutron-to-proton ratios of targets strongly affect the formation of the nuclei by fragmentation as revealed in the yields of the isotopic pairs as well as of the single isotopes. The photon results were compared with those of proton-induced reactions, and no clear effect due to the difference of the initial interactions of photons and protons with nuclei was found in the fragment yields.

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Section: E 0 -Dependence Of Yieldscontrasting

confidence: 74%

“…Closed circles represent the data from Refs. [16,29]. Crosses indicate the values from the Rudstam's empirical formula for spallation.…”

Section: A T -Dependence Of Yieldsmentioning

confidence: 99%

Section: A T -Dependence Of Yieldsmentioning

confidence: 99%

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Target-dependence of light fragment production in photonuclear reactions at intermediate energies

Matsumura¹,

Washiyama²,

Haba³

et al. 2000

Radiochimica Acta

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“…The above mentioned isotopes are about 2-5 times more abundant than the predicted spallation pattern. These excess yields are strongly indicative of alternative mechanisms, essentially fission-and/or fragmentationlike processes, in explaining such anomalous behaviour [14][15][16][25][26][27][28], As a matter of fact, when the nominal nucleón loss of the de-exciting nucleus is such that a very large fraction of the initial mass number goes out (say 40% or more), the mechanism of the reaction may be a collective nuclear excitation with the possibility of fission taking place, i.e. the splitting of the nucleus into two fragments of comparable masses.…”

Section: Discussionmentioning

confidence: 99%

“…Furthermore, to avoid complications due to the possible occurrence of other reactions such as fission and/or fragmentation (at least at higher bombarding particle energies [14][15][16]) we shall confine ourselves to the analysis of those product nuclides for whichy+x %A t /2, i. e. χ <>Z t ¡2 anáy^N t ¡2. Now we have a four-parameter formula to systematize the experimentally determined spallation cross sections.…”

Section: The Formulamentioning

confidence: 99%

Systematics of Spallation Yields with a Four-Parameter Formula

et al. 1984

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A semi-empirical four-parameter formula is proposed in order to systematize intermediate-and high-energy proton-induced spallation yields of target nuclei covering the 50-100 mass number interval. It is shown that the measured yields are reproduced by the formula with a degree of accuracy which is comparable with or better than those obtained in previous proton-spallation systematics by other authors. The formula predicts reliable values for the most probable mass number of isotopie distributions. In addition, it allows one to derive in a simple way the mean nominal number of nucléons lost by the struck target nucleus, the chargeand mass-yield distributions for the spallation residuals, the total spallation reaction cross section, and the N/Z charge-dispersion curves.

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Photodisintegration of light and medium-weight nuclei at intermediate energies—V

Martins

Almeida

Napoli

et al. 1981

Journal of Inorganic and Nuclear Chemistry

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Photodisintegration of light and medium-weight nuclei at intermediate energies—IV photoproduction of 7Be and 11C from targets with masses up to 40

Cited by 10 publications

References 12 publications

Target-dependence of light fragment production in photonuclear reactions at intermediate energies

Target-dependence of light fragment production in photonuclear reactions at intermediate energies

Systematics of Spallation Yields with a Four-Parameter Formula

Photodisintegration of light and medium-weight nuclei at intermediate energies—V

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