(γ, n) reactions in the energy range 1.0–5.5 GeV

Carvalho, H. G. de; Napoli, V. di; Margadonna, D.; Salvetti, F.; Tesch, K.

doi:10.1016/0375-9474(69)90843-4

Cited by 15 publications

(4 citation statements)

References 22 publications

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“…2a, the reported results [27,28,30,31] on (^jXn) reactions are in good agreement with the present ones while those by di Napoli et al [26] for ;c = 1 (closed triangles) and Jonsson and Forkman [29] for x= 1, 3, 6, 7 (closed circles) are discrepant by up to 100%. [22], (•) Ref [30], (T) Ref [31] and (0) Ref. [33].…”

Section: Lodine Target (Figs 2a -D)supporting

confidence: 92%

“…de Carvalho et al [30] and for 1, 3, 6, 7, 8 and 9 at 7.4 GeV by Andersson et al [31]. The yield values of the ()',xn>'p) reactions at Eq g 900 MeV were reported by Jonsson and Persson [32], The present study Covers the yield measurement at 104 ^ £0 ^ 1000 MeV on almost the same radionuclides of I, Te, Sb, Sn and In as in the literature; they are compared in Figs.…”

Section: Lodine Target (Figs 2a -D)mentioning

confidence: 98%

“…Only the reported yields of (Vjjcn) products from i®''Au were available, from the works on (y,n) at £o = 400-900 MeV by di Napoli et al [33], at ^o = 1 -0 -5.5 GeV by de Carvalho et al [30], on (y,xn) of x = l, 2, 3, 5, 7, 9, 11, 13 and 15 at £o = 75-900 MeV by Lindgren and Jonsson [22] and of x=l-ll at £0 = 1 0-7.4 GeV by Andersson et al [31]; the present work Covers 40 products from (y,xnjp) reactions of >> = 0 -5 at £0=45-1000 MeV. Figure3(a-b) compares the present results on (v,xn) reactions of x = 1, 2, 3 and 9 ( Fig.…”

Section: Gold Target (Figs 3a-b)mentioning

confidence: 99%

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Photospallation of Complex Nuclei at Intermediate Energies. I

et al. 1991

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Data are presented for photospallation yields from "^Au, '"La, '"Cs, '"I, ®'Y, "Co and "V targets measured at bremsstrahlung end-point energies (£0) from 30 to 1050 MeV in steps of 100 MeV or less with the aid of suitable radiochemical Separation. The measurements were performed for 40 nuclides from "^Au, 52 from '"La, 44 from '"Cs, 28 from '"I, 31 from ®'Y, 27 from "Co and 22 from "V. The observed yields were either independent or cumulative. For the latter, the precursor-corrected values are also presented. The present results are compared with the available literature data in a form of EQdependence. Isomer yield ratios for 38 pairs were also studied in terms of EQ-, target mass-and spin-dependence.

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Section: Lodine Target (Figs 2a -D)supporting

confidence: 92%

Section: Lodine Target (Figs 2a -D)mentioning

confidence: 98%

Section: Gold Target (Figs 3a-b)mentioning

confidence: 99%

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Photospallation of Complex Nuclei at Intermediate Energies. I

et al. 1991

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“…Some of the data used are given together with the yield data in Tables 2 and 3. per equivalent quanta for the photonuclear reactions in 197 Au have been reported by DE CARVALHO etal. [14] for the energy region of 1.0 to 5.5 GeV, by ANDERSSON etal. [15] for 1 to 7 GeV, DI NAPOLI etal.…”

Section: Yield Calculationmentioning

confidence: 99%

Photospallation Reactions of ¹³³Cs and ¹³⁹La by 100 MeV- and 200 MeV Bremsstrahlungs

Sakamoto¹,

Toramoto

Hamajima

et al. 1984

Radiochimica Acta

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Photospallation yields /Bremsstrahlung (100 Me V, 200 Me V) / 13 3 Cs and 13 * La targets /Isotopic and charge dispersions /Rudstam formula /Isomeric yield ratios Abstract Spallation yields relative to the 1 " Au yield from 1 " Au (γ, n) of 26 to 46 nuclides of Sb, Te, I, Xe, Cs and/or Ba and La from 133 Cs and ,3 'La targets irradiated with bremsstrahlungs of end energies of 100 MeV and 200 MeV were radiochemical^ determined. The isomeric yield ratios for 13 2 La and 131 Ba from the ( 13 'La + 100MeV-y), '"La, 131 Ba, ,21 Te and "'Tefrom the C 3 ' La + 200 MeV-τ), and 120 I, 121 Te and "'Tefrom the( 133 Cs + 200 MeV-7) were also determined. The isotopic yields from the (y,yn) reactions decrease exponentially with increase ofy up to 5, and show no dependence on energy and targets studied, indicating that the reactions of a few neutron emissions occur at energies lower than 100 MeV. When the product yields from the (γ, xpyn) reactions were plotted against (x+y) for each χ (isotopic distribution), a regular variation of the Gaussian distributions, typical of nuclear spallation, was observed. Isobaric mass distributions and charge dispersions were deduced to extract characteristic features of these reactions. The isobaric distributions due only to photons of 100 MeV ~ 200 MeV, which were obtained by subtracting the 100 MeV-yields from the 200 MeV-yields, are very close to a symmetric one peaking at about 8 amu from the target masses. Nuclear charges are also dispersed symmetrically, with most probable N/Z p of about 1.3 replaced by about 1 amu to the neutron-deficient side from the beta stability valley in all the cases studied. Parameters included in RUDSTAM's semiempirical formula were examined by comparing with the observed yield curves. The Ρ values of 0.45 and 0.65, chosen for a better fit to the 200 MeV data on 133 Cs and 13 ' La, respectively, were larger than the predictions reported in the literature. The magic number effects of 1 " La may explain the target-differences in mass distributions.

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