Shape analysis of blocking dips: monte carlo vs. analytical results

Fuschini, E.; Malaguti, F.; Uguzzoni, A.; Verondini, E.

doi:10.1080/00337578408206055

Cited by 13 publications

(2 citation statements)

References 20 publications

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“…To test the accuracy of the continuum approximation, we have compared it with Monte Carlo simulations for a W crystal of about 130 nm, corresponding to the thickness of our targets along the blocking axis [35]. The dips for zero and 15 pm displacements are compared in Fig.…”

Section: Calculation Of Blocking Dipsmentioning

confidence: 99%

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

et al. 2008

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The time delays in fission induced by bombardment of W with 180 MeV 32 S, 240-255 MeV 48 Ti, 330-375 MeV 58 Ni, and 390 MeV 74 Ge have been measured by observation of crystal blocking. Nearly all results are consistent with exponential decay with lifetimes of order 10 −18 s which depend weakly on the atomic number of the composite nucleus. This is inconsistent with the Bohr-Wheeler model of fission from a compound nucleus in statistical equilibrium at each stage in a neutron evaporation cascade and supports a picture of strongly damped quasifission. A simple diffusion model with one-body dissipation reproduces roughly the observed time scale and the exponential decay. It suggests that the outer fission barrier could play a significant role in the observed, very slow decays.

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Section: Calculation Of Blocking Dipsmentioning

confidence: 99%

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

et al. 2008

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“…The latter correction is smaller than for the narrower elastics dips. The measurements are reasonably well reproduced by a Monte Carlo simulation of binary ion-atom scattering [28] and they deviate from the continuum model calculation mainly in the shoulder region. As expected, this deviation is larger than for the elastic dips in Figs.…”

Section: Blocking Dips For Elastics and Calculationsmentioning

confidence: 70%

Time delays in heavy-ion-induced fission of medium-Znuclei, measured by crystal blocking

et al. 2012

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Time delays in fission induced by bombardment of Mo with 170-and 180-MeV 32 S, 225-and 240-MeV 48 Ti, and 300-MeV 58 Ni have been measured by observation of crystal blocking of fission fragments. In contrast to earlier measurements with a W target, the results are consistent with fission of a compound nucleus in competition with mainly neutron emission. Most of the fissions happen on a time scale much shorter than attoseconds but there is a significant component of fission with much longer lifetimes. The measurements are reproduced with a standard statistical model, including a Kramers correction to fission widths from the viscosity of hot nuclear matter. These new results support the interpretation of our earlier measurements with a W target, which indicate that there is a transition in heavy-ion-induced fission at large atomic number and mass, from multichance fission in the standard Bohr-Wheeler picture to fission without formation of a compound nucleus. The process is slowed down by nuclear viscosity, with measured delays of order attoseconds.

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Backscattering

Eckstein

1991

Computer Simulation of Ion-Solid Interactions

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Shape analysis of blocking dips: monte carlo vs. analytical results

Cited by 13 publications

References 20 publications

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

Attosecond time delays in heavy-ion induced fission measured by crystal blocking

Time delays in heavy-ion-induced fission of medium-Znuclei, measured by crystal blocking

Backscattering

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