Yields of Photonuclear Reactions with 320-Mev X-Rays. II. Interpretation of Results

Halpern, I.; Debs, R.J.; Eisinger, J.; Fairhall, A. W.; Richter, H.

doi:10.1103/physrev.97.1327

Cited by 33 publications

(5 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…• ν The parameter Β is also related to the slope Q of the yieldsurface ridge [1,13]. Q represents the decrease of the yield per unit decrease of AZ (or Δχ), and it is defined as…”

Section: Oc-lzt+d/ntmentioning

confidence: 99%

“…A previous paper by us [2], however, has shown unequivocally that a unique normalizing factor a 0 cannot be valid for reproducing the yields of all produced nuclides. One must take into account the fact that yields of various separated residual elements lie on very similar curves (gaussian-or nearly-gaussian-shaped curves) whose maxima do decrease with increasing distance between the target and the product nuclide [13]. Therefore, some modifications must be introduced in formula (1) in order to attain distributions of yields for any Ζ and A values of the nuclides produced in proton bombardment on a given target nucleus.…”

Section: Introductionmentioning

confidence: 98%

See 1 more Smart Citation

Systematics of Spallation Yields with a Four-Parameter Formula

et al. 1984

View full text Add to dashboard Cite

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.

show abstract

“…• ν The parameter Β is also related to the slope Q of the yieldsurface ridge [1,13]. Q represents the decrease of the yield per unit decrease of AZ (or Δχ), and it is defined as…”

Section: Oc-lzt+d/ntmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Systematics of Spallation Yields with a Four-Parameter Formula

et al. 1984

View full text Add to dashboard Cite

show abstract

“…Induced fission of 56 Fe was modeled by Cook and Dallacasa [90]. Independently, Widom et al [42] have proposed photo-fission of 56 Fe from X-rays produced by fast electrons in connection with the fracture experiments of Carpinteri et al Given that photo-fission to roughly equal charge and mass daughters requires GeV energy X-rays, and lacks selectivity [87], how these issues are addressed in such proposals is at issue.…”

Section: Incoherent Disintegration Mechanismmentioning

confidence: 98%

“…There are a few papers in the literature which discuss photodisintegration specifically in the Fe isotopes; for example see [83][84][85][86]. For incident X-rays in the vicinity of the giant dipole resonance, one sees primarily protons, neutrons and alphas ejected; with much higher energy X-rays one sees a wider spread of photo-fission products [87].…”

Section: Incoherent Disintegration Mechanismmentioning

confidence: 99%

Anomalies in fracture experiments, and energy exchange between vibrations and nuclei

Hagelstein

Chaudhary

2014

Meccanica

View full text Add to dashboard Cite

A variety of anomalies have been reported in recent years in fracture experiments, including neutron emission, elemental anomalies, and alpha emission. Such anomalies are similar to those studied in condensed matter nuclear science, which has been of interest to us in the development of theoretical models. In this work a brief review of the new theoretical approach is given, along with connections to both anomalies in fracture experiments and anomalies in other experiments. The fracture anomalies in this picture arise naturally as a result of the relevativistic interaction between vibrations and internal nuclear degrees of freedom, and up-conversion of vibrational quanta. A major conclusion of this work is that the elemental anomalies cannot be accounted for by disintegration as an incoherent process; since the observed products show a high degree of selectivity, while disintegration is very much non-selective. The possibility of disintegration as a coherent quantum process is introduced, and a suggestions for new experiments and measurements are put forth that can help to clarify underlying mechanisms.

show abstract

“…The parameter Β gives the rate of decreasing of the cross section for the different isotopic distribution curves; it is related to the slope of the yield-surface ridge as introduced by HALPERN etal. [5], The parameter tf gives the width of the distribution described by equation (1) and has dimension of (number of protons) -2 . The parameter C is related to the coefficient of "average retention" of charged particles due to the Coulomb potential barrier of the target nucleus.…”

Section: Introductionmentioning

confidence: 99%

Systematics of Photon- and Electron-Induced Spallation Reactions

1989

View full text Add to dashboard Cite

A semi-empirical four-parameter formula is proposed in order to systematize intermediate-and high-energy photon-and electroninduced spallation cross sections of medium weight nuclei. Analytical expressions for the parameters are obtained from parameter-values calculated by best-fitting of experimental data. We extend the same treatment to bremsstrahlung-induced spallation yields, and we verify that very similar analytical expressions for the parameters are obtained. Such a four-parameter formula has shown to predict reliable values of unmeasured spallation reaction cross sections. The reproducibility of the experimental data by the present formula is comparable with or better than those by other semi-empirical formulae with a larger number of parameters.

show abstract

Yields of Photonuclear Reactions with 320-Mev X-Rays. II. Interpretation of Results

Cited by 33 publications

References 37 publications

Systematics of Spallation Yields with a Four-Parameter Formula

Systematics of Spallation Yields with a Four-Parameter Formula

Anomalies in fracture experiments, and energy exchange between vibrations and nuclei

Systematics of Photon- and Electron-Induced Spallation Reactions

Contact Info

Product

Resources

About