Photofission cross-sections of209Bi,232Th and238U above 1 GeV

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

doi:10.1007/bf02743343

Cited by 4 publications

(2 citation statements)

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“…As mentioned in Introduction, the total fission yields of 209 Bi in unit of mb/eq.q. have been extensively measured with ionization chambers [16] and solid-state track detectors [15,18,19,[21][22][23][24]. These results are also compared in Fig.…”

Section: Mass Yield Distributionmentioning

confidence: 99%

“…The total photofission yields and/or cross sections on 209 Bi have been extensively measured with ionization chambers and solid-state track detectors so far [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33]. However, a few works measuring charge distribution and/or mass yield distribution, which are further essential for understanding of fission mechanisms, were performed in the past [34][35][36][37].…”

Section: Introductionmentioning

confidence: 99%

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Photofission of²⁰⁹Bi at intermediate energies

Haba¹,

Kasaoka²,

Igarashi³

et al. 2002

Radiochimica Acta

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Photofission / 209 Bi / Bremsstrahlung / Intermediate energies / Thick-target thick-catcher method / Charge and mass yield distributionsSummary. The reaction yields of 63 radionuclides with the mass number A = 56 − 135 produced in the photofission of 209 Bi by bremsstrahlung of end-point energies (E 0 ) from 450 to 1100 MeV have been measured using a catcher foil technique with the aid of intensive chemical separation. The charge distribution was well reproduced by a Gaussian function with the most probable charge (Z p ) expressed by a linear function of A, i.e., Z p = RA + S, and with the A-independent full width at half maximum (FWHM CD ). The charge distribution parameters R, S and FWHM CD were independent of E 0 above 600 MeV, reflecting the resonance nature in photonuclear reactions at intermediate energies. The weighted mean values at E 0 ≥ 600 MeV were R = 0.421 ± 0.001, S = 0.6 ± 0.1 and FWHM CD = 2.1 ± 0.1 charge unit (c.u.). The numbers of pre-and post-fission neutrons were deduced to be ν pre = 12 ± 1 and ν post = 1.4 ± 0.3, respectively, assuming the Unchanged Charge Distribution (UCD). Based on the charge distribution parameters, the symmetric mass yield distributions with the most probable mass A p of 96 ± 1 mass unit (m.u.) and the width FWHM MD of 33 ± 1 m.u. were also obtained. The characteristics of the charge and mass yield distributions are discussed by referring to those for 197 Au based on the results of calculations using the Photon-induced Intranuclear Cascade Analysis code combined with the Generalized Evaporation Model (PICA3/GEM).

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