Determination of the cross-sections for the production of fragments from relativistic nucleus-nucleus interactions. 2: Parametric fits

Cummings, J.R. ; Waddington, C.Jake ; Binns, W.R. ; et al.
Phys.Rev.C 42 (1990) 2530-2545, 1990.
Inspire Record 307321 DOI 10.17182/hepdata.5444

Measurements of the partial charge-changing cross sections for the fragmentation of relativistic iron, lanthanum, holmium, and gold nuclei of several different energies incident on targets of polyethylene, carbon, aluminum, and copper have been reported in an accompanying paper. This paper describes the systematics of the variations of these cross sections with energy, projectile, target, and fragment. We have been able to generate a seven-parameter global fit to 795 measured cross sections for the heavy targets which fits the data with a standard deviation of 7%. We have also generated a similar global fit to 303 measured cross sections for a hydrogen target which fits the data with a standard deviation of 10%. These representations imply that the hypothesis of limiting fragmentation is only accurate to some 20–30 %. Weak factorization can apply, but fits that are marginally better, and more physically plausible, can be obtained without factorization. We have identified, and discussed, a number of caveats to the applicability of these fits outside, and inside, the range of energies and masses covered. Excessively large cross sections for the loss of a single proton from the projectile nuclei suggest electromagnetic dissociation. The cross sections for fragments that experience large charge changes appear to become independent of the size of the charge change. Very heavy projectiles have a significant probability of experiencing fission.

20 data tables

No description provided.

No description provided.

No description provided.

More…

Total charge-changing cross sections for neutron-deficient isotopes from $^{58}$Ni fragmentation

Blank, B. ; Andriamonje, S. ; Del Moral, R. ; et al.
Z.Phys.A 352 (1995) 69-75, 1995.
Inspire Record 1389077 DOI 10.17182/hepdata.16503

At the projectile-fragment separator FRS of GSI, relativistic secondary beams of about 520 MeV/nucleon were produced by fragmentation of a primary beam of58Ni at 650 MeV/nucleon in a beryllium target. By means of aΔE—Bρ—TOF measurement, the fragments have been identified and their charge-changing probabilities in targets of CH2, C, Al, and Pb have been determined. We describe the results for the total charge-changing cross sections in this first paper, whereas a second article deals with the partial charge-changing cross sections. At the drip line, the measured charge-changing cross sections exhaust close to 100% of the total interaction cross sections as calculated with semiempirical models. The measurements at the proton drip line with low-Z targets indicate that only a very small increase of the cross sections may be observed, whereas the measurements with a lead target show that no significant increase of the total charge-changing cross sections is present which would be a hint for low-lying dipole strength. Our experimental data are compared to Glauber-type calculations.

24 data tables

Nucleus is C H2.

Nucleus is C H2.

Nucleus is C H2.

More…

Fragmentation of Ne-22 in Emulsion at 4.1-a/GeV/c

El-Naghy, A. ; Krasnov, S.A. ; Tolstov, K.D. ; et al.
J.Phys.G 14 (1988) 1125-1137, 1988.
Inspire Record 251875 DOI 10.17182/hepdata.39460

Charge distributions of projectile fragments produced in the interactions of 22Ne beams with emulsion at 4.1A GeV/c have been studied. Correlations between projectile and target fragments and among projectile fragments are presented. The change of charge yield distribution with the violence of the collision has been shown. The present analysis contradicts theoretical calculations describing the inclusive charge yield distribution of fragments by a single process.

4 data tables
More…

Yields and transverse momenta of the Li-6 fragments in the emulsion at 4.5-GeV/c per nucleon.

Lepekhin, F.G. ; Seliverstov, D.M. ; Simonov, B.B. ;
Eur.Phys.J.A 1 (1998) 137-141, 1998.
Inspire Record 468081 DOI 10.17182/hepdata.43787

We present the results of the study of interaction of the relativistic 6Li nucleus with the momentum 4.5 GeV/c per nucleon with the photoemulsion. Yields of the 1H (3He) and 2H (4He) isotopes due to t

1 data table

Cross section for the charged exchange and pickup reactions at the fragmentation of LI6 in the photoemulsion.


Rescattering probed by the emission of slow target associated particles in high-energy heavy ion interactions

The EMU01 collaboration Adamovich, M.I ; Aggarwal, M.M ; Alexandrov, Y.A ; et al.
Phys.Lett.B 363 (1995) 230-236, 1995.
Inspire Record 406952 DOI 10.17182/hepdata.28438

In this letter the distribution of slow target associated particles emitted in Au + Emulsion interactions at 11.6 A GeV/ c is studied. The three models RQMD, FRITIOF and VENUS are used for comparisons and especially their treatment of rescattering is investigated.

6 data tables

No description provided.

PROJECTILE ASSOCIATED HE-FRAGMENTS.

No description provided.

More…

Charge changing fragmentation of 10.6-GeV/nucleon Au-197 nuclei

The UHIC collaboration Geer, L.Y. ; Klarmann, J. ; Nilsen, B.S. ; et al.
Phys.Rev.C 52 (1995) 334-345, 1995.
Inspire Record 406577 DOI 10.17182/hepdata.25870

We have measured the charge-changing cross sections of 10.6 GeV/nucleon Au197 nuclei interacting in targets of CH2 (polyethylene), C, Al, Cu, Sn, and Pb. Cross sections for H are calculated from those measured in C and CH2. The total charge-changing cross sections are higher than those measured at energies of ≤1 GeV/nucleon. The measured cross sections for the heavier targets are somewhat larger than those predicted by a model based on data taken at lower energies with lighter targets. Partial charge-changing cross sections for the production of fragments from the incident Au projectiles were measured for charge changes (ΔZ) from ΔZ=+1,80Hg, down to approximately ΔZ=-29,50Sn. In comparison to lower energy measurements, these partial cross sections are found to be smaller for small ΔZ and larger or the same for large ΔZ. The H partial cross sections are found to follow a power law in ΔZ similar to that for heavier targets, instead of the exponential form observed at lower energies. Factorization is found to hold for all partial cross sections with ΔZ greater than two. In the heavier targets, the cross sections for one and two proton removal have significant contributions from electromagnetic dissociation. The electromagnetic dissociation contribution to the total cross section is derived and found to be relatively small, but with a strong dependence on the charge of the target nuclei of the form ZT1.75±0.01.

2 data tables

TARGET NUCLEUS=CH2(POLYETHYLENE).

TARGET NUCLEUS=CH2(POLYETHYLENE).


Fragmentation cross-sections of O-16, Mg-24, and S-32 projectiles at 3.65-GeV/nucleon

Sampsonidis, D. ; Papanastassiou, E. ; Zamani, M. ; et al.
Phys.Rev.C 51 (1995) 3304-3308, 1995.
Inspire Record 405741 DOI 10.17182/hepdata.25889

We have investigated the fragmentation of 3.65 GeV/nucleon O16, Mg24, and S32 projectiles on C, Al, Cu, Ag, and Pb targets using solid state nuclear track detectors. Track counting was performed by an automatic measuring system. Total charge changing and the partial cross sections for the production of fragments with charges 9≤Z≤15 for S32 projectiles and of charge 6≤Z≤11 for Mg24 were determined. Comparison with theoretical models and other experimental data is made.

1 data table

No description provided.


Nuclear and electromagnetic fragmentation of 2.25-TeV Au-197 nuclei

He, Y.D. ; Price, P.B. ;
Z.Phys.A 348 (1994) 105-109, 1994.
Inspire Record 380468 DOI 10.17182/hepdata.16562

We report the first measurement of the total charge-loss cross section σtot=σem+σnuc and partial cross sections (for ΔZ=1, 2, ..., 9) of 11.4 A GeV197Au nuclei in various targets. The large Coulomb barrier for Au reduces the electromagnetic contribution σem in a Pb target to only 18% of σnuc, compared with ∼ 70% for 14.5 A GeV28Si and 120% for 200 A GeV32S. With σem taken to be ∝ZT1.8, σnuc can be fitted with σnuc=α(AP1/3 +AT1/3−b)2, with b=0.83 and α=59 mb, essentially the same as found at energies of 1 to 2 A GeV. Electromagnetic partial cross sections for ΔZ=1 exceed ∼ 40 mb in the Pb, Sn, Cu, and Fe targets and are substantial for larger values ofΔZ in the heavier targets.

2 data tables

TOTAL CHARGE-LOSS CROSS SECTION.

PARTIAL CHARGE-CHANGING CROSS SECTION.


Determination of the cross-sections for the production of fragments from relativistic nucleus-nucleus interactions. 1: Measurements

Cummings, J.R. ; Waddington, C.Jake ; Binns, W.R. ; et al.
Phys.Rev.C 42 (1990) 2508-2529, 1990.
Inspire Record 307293 DOI 10.17182/hepdata.5443

Relativistic iron, lanthanum, holmium, and gold projectile nuclei with several different energies have been fragmented in targets of polyethylene, carbon, aluminum, copper, and lead. Our detectors cleanly resolve the individual charges of the heaviest of these fragments and provide some limited information on the masses. We have measured 1256 elemental partial cross sections for the production of fragments from interactions in these target materials. Values have been derived for another 417 cross sections in a hydrogen medium. These cross sections depend on the energy and mass of the projectile nuclei as well as on the nature of the target. Total charge-changing cross sections were also found, but only in a composite target, and have been shown to be weakly dependent on energy. The mean mass losses observed for fragments that have lost a few protons show that typically many neutrons are lost with each proton, producing fragment nuclei that must be highly proton rich, and consequently very unstable. The cross sections for charge pickup on heavy targets show a rapid increase with decreasing energy, particularly for the heaviest targets. The systematics of the dependencies of the partial cross sections will be discussed in a companion paper.

11 data tables

TARGET NUCLEUS=CH2.

No description provided.

No description provided.

More…

Electromagnetic dissociation of U-238 at 120 MeV/nucleon

Justice, M.L. ; Blumenfeld, Y. ; Colonna, N. ; et al.
Phys.Rev.C 49 (1994) R5-R9, 1994.
Inspire Record 389446 DOI 10.17182/hepdata.25976

Electromagnetic fission cross sections of a 120 MeV/nucleon U238 beam incident on five targets, Be9, Al27, Cunat, Agnat, and Unat, have been extracted from measurements of projectile velocity fission fragments. The nuclear interaction contributions to the experimentally observed cross sections were determined by extrapolation from the Be target data using a geometrical scaling model and by an empirical decomposition of the fission charge distributions. The results are compared to model calculations in which electric quadrupole excitations have been included.

1 data table

ELECTROMAGNETIC FISSION CROSS SECTIONS WERE DETERMINED FOR AL, CU, AG AND U TARGET, BE DATA IN TABLE CORRESPONDS TO NUCLEAR INTERACTION.


Fragmentation of 1.2-GeV per nucleon La-139

Christie, W.B. ; Romero, J.L. ; Brady, F.P. ; et al.
Phys.Rev.C 48 (1993) 2973-2983, 1993.
Inspire Record 366050 DOI 10.17182/hepdata.26083

The fragmentation of 1.2 GeV per nucleon La139 nuclei has been studied. Total charge changing cross sections for H (CH2-C), C, and Pb target nuclei, and elemental production cross sections for C and CH2 targets for 1≤ΔZ≤30 have been measured. For heavy projectile fragments, the projected transverse momenta extracted are generally larger than predicted by models based on the internal momenta of nucleons in nuclei. Fits to the heavy fragment momentum distributions yield additional transverse momenta or ‘‘bounce-off’’ which range from ≃500 to 1000 MeV/c.

1 data table

No description provided.


Fragmentation cross-sections of O-16 between 0.9-GeV/nucleon and 200-GeV/nucleon

Hirzebruch, S.E. ; Heinrich, W. ; Tolstov, K.D. ; et al.
Phys.Rev.C 46 (1992) 1487-1494, 1992.
Inspire Record 345208 DOI 10.17182/hepdata.38512

Inclusive cross sections for high energy interactions at 0.9, 2.3, 3.6, and 13.5 GeV/nucleon of O16 with C, CR-39 (C12H18O7), CH2, Al, Cu, Ag, and Pb targets were measured. The total charge-changing cross sections and partial charge-changing cross sections for the production of fragments with charge Z=6 and Z=7 are compared to previous experiments at 60 and 200 GeV/nucleon. The contributions of Coulomb dissociation to the total cross sections are calculated. Using factorization rules the partial electromagnetic cross sections are separated from the nuclear components. Energy dependence of both components are investigated and discussed.

1 data table

No description provided.


Fragmentation Cross-sections of $^{16}$O at 60-{GeV}/nucleon and 200-{GeV}/nucleon

Brechtmann, C. ; Heinrich, W. ;
Z.Phys.A 330 (1988) 407-416, 1988.
Inspire Record 23646 DOI 10.17182/hepdata.16593

We used CR39 plastic nuclear track detectors (C12H18O7) in combination with automatic track measurement to determine total charge changing and partial cross sections for the production of fragments of chargeZ=6 andZ=7 in collisions of16O beam nuclei at energies of 60 GeV/nucleon and 200 GeV/nucleon in targets H, C, CR39, CH2, Al, Cu, Ag and Pb. Total charge changing cross sections due to the process of electromagnetic dissociation are calculated based on a theoretical model and found to be consistent with total and partial electromagnetic dissociation cross sections derived from this experiment. The energy dependence of pure nuclear fragmentation is investigated.

6 data tables

OBS = TOTAL CHARGE CHANGING CROSS SECTION.

No description provided.

No description provided.

More…

PROPERTIES OF PROJECTILE FRAGMENTS FROM C-12 EMULSION INTERACTIONS AT 4.5.A/GEV/C

Ahmad, M.S. ; Khan, M.Q.R. ; Hasan, R. ;
Nucl.Phys.A 499 (1989) 821-836, 1989.
Inspire Record 286250 DOI 10.17182/hepdata.36940

2550 interactions of 12 C in emulsion at 4.5 A GeV / c have been used to study the properties of projectile fragments. The multiplicity and projected angular distributions of projectile fragments in different target groups have been studied. The production cross section of the reaction in which projectile 12 C breaks up into two Z = 3 fragments is found to be 6.6 × 10 −3 of the total inelastic cross section. The projected angular distributions of fragments exhibit features of limiting fragmentation. Statistically significant azimuthal correlations among fragments in the azimuthal plane indicates that the fragmenting nucleus gets a transverse momentum during the collision.

13 data tables

No description provided.

NUCLEUS IS CNO.

NUCLEUS IS AGBR.

More…

Multiplicities of secondaries in interactions of 1.8-GeV/nucleon Fe-56 nuclei with photoemulsion and the cascade evaporation model

Dudkin, V.E. ; Kovalev, E.E. ; Nefedov, N.A. ; et al.
Nucl.Phys.A 509 (1990) 783-799, 1990.
Inspire Record 302290 DOI 10.17182/hepdata.36888

A nuclear photographic emulsion method was used to study the charge-state, ionization, and angular characteristics of secondaries produced in inelastic interactions of 56 Fe nuclei at 1.8 GeV/nucleon with H, CNO, and AgBr nuclei. The data obtained are compared with the results of calculations made in terms of the Dubna version of the cascade evaporation model (DCM). The DCM has been shown to satisfactorily describe most of the interaction characteristics for two nuclei in the studied reactions. At the same time, quantitative differences are observed in some cases.

16 data tables

No description provided.

No description provided.

NUCLECS IS CNO.

More…

On the Production of Helium Fragments in Ultrarelativistic Heavy Ion Collisions

Sengupta, K. ; Singh, G. ; Jain, P.L. ;
Phys.Lett.B 222 (1989) 301-305, 1989.
Inspire Record 25611 DOI 10.17182/hepdata.29805

Partial production cross sections of projectile alpha fragments produced in high-energy interactions of 16 O and 32 S at 200 GeV/n and 16 O at 60 GeV/n in emulsion are studied. Evidence of multiplicity scaling of such produced fragments is presented in the energy range 2–200 GeV/n for various projectiles.

7 data tables

No description provided.

No description provided.

No description provided.

More…

THE STUDY OF TOTAL DISINTEGRATION OF LEAD NUCLEI WITH Mg-24 NUCLEI AT 4.5-a/GeV/c

The Dubna-Cairo-Kosice-Rez collaboration Krasnov, S.A. ; Tolstov, K.D. ; Shabratova, G.S. ; et al.
JINR-P1-88-389, 1988.
Inspire Record 265668 DOI 10.17182/hepdata.38868

None

9 data tables

No description provided.

No description provided.

No description provided.

More…

LAMBDA AND K0(S) PRODUCTION IN INELASTIC AND MULTI - NUCLEON C C INTERACTIONS AT 4.2-GeV/c PER NUCLEON

Armutliisky, D.D. ; Bogdanovich, E. ; Gasparian, A.P. ; et al.
JINR-P1-85-220, 1985.
Inspire Record 216729 DOI 10.17182/hepdata.9643

None

10 data tables

No description provided.

No description provided.

No description provided.

More…

Analysis of Behavior of $\pi^-$ Mesons and Protons Produced in Nucleus-nucleus Interactions at 4.2-{GeV}/$c$ Per Nucleon Depending on the Number of Interacting Protons

Agakishiev, G.N. ; Backovic, S. ; Boldea, V. ; et al.
Sov.J.Nucl.Phys. 45 (1987) 852, 1987.
Inspire Record 235264 DOI 10.17182/hepdata.9548

None

22 data tables

FRAGT IS CHARGE BARYON WITH PATH < 4 CM.

FRAGT IS CHARGE BARYON WITH PATH < 4 CM.

FRAGT IS CHARGE BARYON WITH PATH < 4 CM.

More…

PROPERTIES OF THE C Ta INTERACTIONS WITH LAMBDA HYPERON AND K0 MESON PRODUCTION AT 4.2-GeV/c PER NUCLEON

Iovchev, K. ; Kanarek, T. ; Kladnitskaya, E.N. ; et al.
JINR-P1-84-279, 1984.
Inspire Record 202985 DOI 10.17182/hepdata.17552

None

14 data tables

No description provided.

No description provided.

No description provided.

More…

Fragmentation Cross-sections of $^{32}$S at 0.7-{GeV}/nucleon, 1.2-{GeV}/nucleon and 200-{GeV}/nucleon

Brechtmann, C. ; Heinrich, W. ;
Z.Phys.A 331 (1988) 463-472, 1988.
Inspire Record 24135 DOI 10.17182/hepdata.48156

We used CR39 plastic nuclear track detectors (C12H18O7) in combination with automatic track measurement techniques to determine total charge changing and partial cross sections for the production of fragments of chargeZ F =6 toZ F =15 in collisions of32S beam nuclei at energies of 0.7, 1.2 and 200 GeV/nucleon in targets H, C, CR39, CH2, Al, Cu, Ag and Pb. By application of factorization rules measured partial cross sections are separated into pure nuclear and electromagnetic components. Total and partial cross sections for electromagnetic dissociation are compared with theoretical models. The energy dependence of pure nuclear cross sections is investigated.

17 data tables

No description provided.

NUCLEUS=12C 18H 7O.

NUCLEUS=18C 38H 7O.

More…