Fission of Bi induced by a quasi-monochromatic photon beam at energies from 100 MeV to 280 MeV

Bellini, V.; Emma, V.; Nigro, S. Ló; Milone, C.; Pappalardo, G. S.; Sanctis, E. De; Giacomo, P.; Guaraldo, C.; Lucherini, V.; Polli, E.; Reolon, A. R.

doi:10.1007/bf02747216

Cited by 16 publications

(5 citation statements)

References 12 publications

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“…With the CRISP code, we succeeded to perform the calculation of the photofission cross sections for various actinide and preactinide nuclei. In figure 4, we present For Bi, the experimental data are taken from [28] (open squares), [29] (open triangles), [30] (open circles), [31] (open rhombs), [36] (open cross), [37] (open stars) and [38] (asterisks). For Pb, the data are taken from [33] (open squares).…”

Section: Resultsmentioning

confidence: 99%

“…Figure 4. Photofission cross section per nucleon for Bi and Pb target nuclei in the nucleon resonance region calculated by the CRISP code (full circles) compared with experimental data.For Bi, the experimental data are taken from[28] (open squares),[29] (open triangles),[30] (open circles),[31] (open rhombs),[36] (open cross),[37] (open stars) and[38] (asterisks). For Pb, the data are taken from[33] (open squares).…”

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confidence: 99%

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The CRISP package for intermediate- and high-energy photonuclear reactions

Deppman¹,

Duarte²,

Silva³

et al. 2004

J. Phys. G: Nucl. Part. Phys.

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The two-step process that characterizes the intermediate-and high-energy photonuclear reactions (between 40 MeV and 4 GeV) has been successfully described by Monte Carlo calculations. Recently, a new class of codes capable to perform those calculations according to a more realistic method has been developed, improving the possibilities for simulating the reactions in more details. In this work we present the CRISP package (standing for Rio-São Paulo Collaboration), which is a coupling of the multi collisional Monte Carlo (MCMC) and the Monte Carlo for evaporation-fission (MCEF) codes. The first one describes the intranuclear cascade process, while the second one is dedicated to the evaporation/fission competition step. Both codes have already shown to be useful for calculating several features of different nuclear reactions. The CRISP code, coupling these two software, represents a good tool to describe the complex characteristics of the nuclear reactions, and opens the opportunity for applications in quite different fields, such as studies of hadron physics inside the nucleus, specific nuclear reactions, spallation and/or fission processes initiated by different probes and many others.

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Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

The CRISP package for intermediate- and high-energy photonuclear reactions

Deppman¹,

Duarte²,

Silva³

et al. 2004

J. Phys. G: Nucl. Part. Phys.

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“…The use of monochromatic photon beams of energy greater than 20 MeV or so to study photonuclear reactions has produced in the last twelve years a number of reliable data on photoreactions, particularly those concerned with fission reactions (photofission) of actinide nuclei [1][2][3][4][5][6][7][8][9] and, to a lesser extent, of heavy-metal nuclei of mass number A < 210 [8,[10][11][12][13][14]. For incident photon energies in the range ,-~ 30-140 MeV, the photo fission data have been generally interpreted on the basis of a model which considers the primary nuclear photoabsorption as taking place between the incoming photon and a neutronproton pair (quasi-deuteron photoabsorption mechanism first proposed by Levinger [15]) followed by a process of competition between nucleon evaporation and fission experienced by the excited residual nucleus [5, 8, 9, 12-14, 16, 17].…”

Section: Introductionmentioning

confidence: 99%

Analysis of209Bi and238U photofission cross section in the quasi-deuteron region of photonuclear absorption

Tavares

Terranova

1992

Z. Physik A - Hadrons and Nuclei

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Abstract. An analysis of the photofission reactions in the quasi-deuteron energy range of photonuclear absorption (~30-140 MeV) has been performed for 2~ and 238U nuclei. Experimental cross section data available in the literature have been compared with calculated values obtained from a model in which the incoming photon is assumed to be absorbed by a neutron-proton pair (Levinger's quasi-deuteron photoabsorption), followed by a mechanism of evaporation-fission competition for the excited residual nuclei. The model has been shown to reproduce the main experimental features of 2~ and ~38U photofission cross section, although unexplained differences still remain in the case of 238U-fission by 30-50 MeV incident photons. 25.85.Jg PACS:

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“…The results of the PICA3/GEM calculations [46] are smaller than the experimental ones for both 209 Bi and 197 Au, especially at lower E 0 . In recent years, total fission cross sections have been intensively measured by quasi-monochromatic photon beams of energies up to 300 MeV [25][26][27][28][29][30][31][32][33], and the detailed structure of the excitation function of the photofission of 209 Bi has become clear. The cross sections in the energy region for the giant dipole resonance and the quasi-deuteron mechanism were found to be negligibly small compared with those in the ∆ resonance.…”

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%

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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Fission of Bi induced by a quasi-monochromatic photon beam at energies from 100 MeV to 280 MeV

Cited by 16 publications

References 12 publications

The CRISP package for intermediate- and high-energy photonuclear reactions

The CRISP package for intermediate- and high-energy photonuclear reactions

Analysis of209Bi and238U photofission cross section in the quasi-deuteron region of photonuclear absorption

Photofission of²⁰⁹Bi at intermediate energies

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Fission of Bi induced by a quasi-monochromatic photon beam at energies from 100 MeV to 280 MeV

Cited by 16 publications

References 12 publications

The CRISP package for intermediate- and high-energy photonuclear reactions

The CRISP package for intermediate- and high-energy photonuclear reactions

Analysis of209Bi and238U photofission cross section in the quasi-deuteron region of photonuclear absorption

Photofission of209Bi at intermediate energies

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Photofission of²⁰⁹Bi at intermediate energies