Eikonal expansion for total cross sections of heavy ion reactions

The ALICE Collaboration measured dielectron production as a function of the invariant mass ( m ee ), the pair transverse momentum ( p T , ee ) and the pair distance of closest approach ( DCA ee ) in pp collisions at s = 7 TeV. Prompt and non-prompt dielectron sources can be separated with the DCA ee , which will give the opportunity in heavy-ion collisions to identify thermal radiation from the medium in the intermediate-mass range dominated by contributions from open-charm and beauty hadron decays. The charm and beauty total cross sections are extracted from the data by fitting the spectra with two different MC generators, i.e., PYTHIA a leading order event generator and POWHEG a next-to-leading order event generator. Significant model dependences are observed, reflecting the sensitivity of this measurement to the heavy-flavour production mechanisms.

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Extracting integrated and differential cross sections in low-energy heavy-ion reactions from backscattering measurements

The European Physical Journal A ◽

10.1140/epja/i2014-14168-8 ◽

2014 ◽

Vol 50 (11) ◽

Cited By ~ 8

Author(s):

V. V. Sargsyan ◽

G. G. Adamian ◽

N. V. Antonenko ◽

A. Diaz-Torres ◽

P. R. S. Gomes ◽

...

Keyword(s):

Cross Sections ◽

Differential Cross ◽

Heavy Ion ◽

Low Energy ◽

Differential Cross Sections ◽

Heavy Ion Reactions

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Double-differential cross sections for the neutron production from heavy-ion reactions at energiesE/A=290–600MeV

Physical Review C ◽

10.1103/physrevc.64.054609 ◽

2001 ◽

Vol 64 (5) ◽

Cited By ~ 32

Author(s):

Y. Iwata ◽

T. Murakami ◽

H. Sato ◽

H. Iwase ◽

T. Nakamura ◽

...

Keyword(s):

Cross Sections ◽

Differential Cross ◽

Heavy Ion ◽

Neutron Production ◽

Differential Cross Sections ◽

Heavy Ion Reactions

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Heavy-ion reactions as spin probes

Canadian Journal of Physics ◽

10.1139/p87-086 ◽

1987 ◽

Vol 65 (6) ◽

pp. 609-613 ◽

Cited By ~ 5

Author(s):

Sam M. Austin ◽

N. Anantaraman ◽

J. S. Winfield

Keyword(s):

Cross Sections ◽

Reaction Mechanisms ◽

Heavy Ion ◽

Spin Transfer ◽

Calibration Function ◽

Matrix Elements ◽

Heavy Ion Reactions ◽

One Step ◽

The One ◽

Gamow Teller

Heavy-ion reactions can be powerful probes for spin-transfer strength in nuclei, provided their reaction mechanism is simple so that a correlation can be established between cross sections and the relevant matrix elements. We discuss the desirable features of heavy-ion reactions in general and a series of tests of reaction mechanisms that have been carried out for two of the most favorable reactions; (6Li, 6He) and (12C, 12N). We establish that the (6Li, 6He) reaction is one-step in nature above 25 MeV∙nucleon−1 and establish a calibration function relating cross sections and Gamow–Teller matrix elements. We also find that the (12C, 12N) reaction is likely to be dominated by the one-step process above about 50 MeV∙nucleon−1.

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Zdependence of Coulomb dissociation cross sections in heavy ion reactions

Physical Review C ◽

10.1103/physrevc.41.2410 ◽

1990 ◽

Vol 41 (5) ◽

pp. 2410-2413 ◽

Cited By ~ 5

Author(s):

D. Lissauer ◽

H. Takai

Keyword(s):

Cross Sections ◽

Heavy Ion ◽

Coulomb Dissociation ◽

Heavy Ion Reactions

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Light-fragment yield ratios from heavy-ion-induced fragmentation in atmospheric collisions of cosmic-ray primary nuclei

Canadian Journal of Physics ◽

10.1139/p91-220 ◽

1991 ◽

Vol 69 (12) ◽

pp. 1481-1486

Author(s):

M. J. Pantazopoulou ◽

A. F. Barghouty ◽

R. A. Witt

Keyword(s):

Cross Sections ◽

Cosmic Ray ◽

Heavy Ion ◽

Fragmentation Model ◽

Light Fragment ◽

Collision System ◽

Nuclear Fragmentation ◽

Good Correspondence ◽

Total Cross Sections ◽

Fragment Yield

A statistical nuclear-fragmentation model is used to calculate the total inclusive cross sections and yield ratios of light fragments (p, d, 3H, and 3He) from 800 MeV/nucleon mass-symmetric and mass-asymmetric collision systems. Comparison with available data reveal good correspondence between the observed total cross sections and fragment-yield ratios, and the calculated ones. The model is also used to calculate the 4He/3He ratio from CNO + CNO collisions at 1 GeV/nucleon. Averaging over the mass numberof the CNO collision system, we calculate a ratio of 5.76 ± 0.52 ± 12%. A mass-independent thermal-model formula gives a ratio of only ≈ 1.5. The appreciable calculated production of 4He relative to 3He, as fragmentation products in atmospheric CNO collisions with 1 GeV/nucleon cosmic-ray primary CNO nuclei, has important implications for studies of atmospheric secondaries as background sources for space-based and balloon-borne light-fragment observations.

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