Factorization of fragment-production cross sections in relativistic heavy-ion collisions

Olson, D.; Berman, B. L.; Greiner, D.; Heckman, H. H.; Lindstrom, P. J.; Crawford, H. J.

doi:10.1103/physrevc.28.1602

Cited by 156 publications

(90 citation statements)

References 7 publications

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“…According to this picture, Coulomb-induced break-up emerges, naturally, from the large impact parameters. Nuclear dissociation results, on the other hand, from a narrow band of grazing partial waves which -at very high bombarding energies -corresponds to impact parameters close to the sum of the radii of the colliding nuclei [7]. Note that this last sentence immediately suggests that the nuclear break-up cross sections should follow a A 1/3 -dependence on the target mass (which is also the prediction of the Serber model [8], based on purely geometrical arguments).…”

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confidence: 98%

Target-mass dependence of the break-up of halo nuclei

et al. 2001

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Nuclear dissociation cross sections for halo nuclei have been assumed by various authors to have a A 1/3 dependence on the target mass. These cross sections have also been considered to be a sum of the nuclear and Coulomb components. During recent years, the break-up of exotic halo nuclei has been investigated both theoretically and experimentally by several groups [1][2][3][4][5][6]. One of the main motivations of these studies is the possibility of determining, in selected cases, the astrophysical S-factor. In fact, if the predominant contributions to the dissociation mechanism were due to first-order electromagnetic transitions into the continuum, the observed cross section could be related to those of the inverse photo-capture reaction process.To apply this procedure, however, it is necessary to justify the absence of a significant nuclear contribution to the relevant excitation amplitudes. To this end it has been argued that the Coulomb and nuclear break-up processes are associated with rather distinct regions of the impact parameter range. In such case Coulombnuclear interference needs not be considered and the total break-up cross section would simply be the sum

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confidence: 98%

Target-mass dependence of the break-up of halo nuclei

et al. 2001

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“…Light ions are produced by several mechanisms including nuclear abrasion, ablation, coalescence, cluster knockout, and electro-magnetic dissociation. In Table 1 we show contributions for several of these mechanisms for 16 O fragmentation on several targets and compare to the experimental data of Olsen et al [18]. Coalescence is predicted to be a dominant mechanism for d, t, h, and α-particle production.…”

Section: Resultsmentioning

confidence: 70%

Description of light ion production cross sections and fluxes on the Mars surface using the QMSFRG model

Cucinotta

Kim

Schneider

et al. 2007

Radiat Environ Biophys

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The atmosphere of Mars significantly attenuates the heavy ion component of the primary galactic cosmic rays (GCR), however increases the fluence of secondary light ions (neutrons, and hydrogen and helium isotopes) because of particle production processes.We describe results of the quantum multiple scattering fragmentation (QMSFRG) model for the production of light nuclei through the distinct mechanisms of nuclear abrasion and ablation, coalescence, and cluster knockout. The QMSFRG model is shown to be in excellent agreement with available experimental data for nuclear fragmentation cross sections. We use the QMSFRG model and the space radiation transport code, HZETRN to make predictions of the light particle environment on the Martian surface at solar minimum and maximum. The radiation assessment detector (RAD) experiment will be launched in 2009 as part of the Mars Science Laboratory (MSL). We make predictions of the expected results for time dependent count-rates to be observed by RAD experiment.Finally, we consider sensitivity assessments of the impact of the Martian atmospheric composition on particle fluxes at the surface.https://ntrs.nasa.gov/search

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“…As a result of the present comparison the NUCFRG2 code has been modified to include Cucinotta's alpha knockout cross sections for 160 projectiles on all targets giving satisfactory agreement with the measurements of Olson et al (1983) as shown in Figure 5. The final NUCFRG2 cross sections are shown in comparison with those measured at GSI in Table I.…”

Section: Comparison With Experimentsmentioning

confidence: 56%

“…The nuclear interaction viewed as a combination of inelastic, quasielastic, and nonelastic events leads us to assume the main quasielastic event in which specific particles or clusters are removed from a reasonably stable core cannot be accommodated within a liquid drop formalism (Cucinotta and Dubey, 1994b;Cucinotta et al, 1994a) while the highly nonelastic events in which the mass removed from the projectile is fully dissociated is better represented by the NUCFRG2 code. One can see these dynamic differences in the 12C113C ratio in the fragmentation of 40At (ratio of 1) in comparison with the value for fragmentation of 160 (ratio of 2.3) as measured by Tall (1990); Olson et al (1983) respectively.…”

Section: Introductionmentioning

confidence: 61%

“…The carbon isotope distribution in highly nonelastic collisions are equally distributed between 12C and I3C as Can be seen in 40Ar fragmentation . In distinction, the fi'agmentation of 160 shows the single alpha knockout cross section to cause an excess of 12C fragments being produced (Olson et al, 1983). The addition of the alpha knockout cross section leaving the -C core in the ground state to the NUCFRG2 nonelastic cross section (solid curve) brings good agreement with the GSI oxygen beam data.…”

Section: Comparison With Experimentsmentioning

confidence: 69%

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Transport of light ions in matter

Wilson

Cucinotta

Tai

et al. 1998

Advances in Space Research

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A recent set of light ion experiments are analyzed using the Green's function method of solving the Boltzmann equation for ions of high charge and energy (the GRNTRN transport code) and the NUCFRG2 fragmentation database generator code. Although the NUCFRG2 code reasonably represents the _agmentation of heavy ions, the effects of light ion fragmentation requires a more detailed nuclear model 'qrancluding shell structure and short range correlations appearing as tightly bound clusters in the light ion nucleus. The most recent NUCFRG2 code is augmented with a quasielastic alpha knockout model and semiempirical adjustments (up to 30 percent in charge removal) in the fragmentation process allowing reasonable agreement with the experiments to be obtained.A final resolution of the appropriate cross sections must await the full development of a coupled channel reaction model in which shell structure and clustering can be accurately evaluated. Publishedby Elsevier Science Ltd on behalf of COSPAR.

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Factorization of fragment-production cross sections in relativistic heavy-ion collisions

Cited by 156 publications

References 7 publications

Target-mass dependence of the break-up of halo nuclei

Target-mass dependence of the break-up of halo nuclei

Description of light ion production cross sections and fluxes on the Mars surface using the QMSFRG model

Transport of light ions in matter

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