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Study of the multi-fragment production in asymmetric heavy ion reactions at E/A = 600 MeV; Untersuchung der Multi-Fragment-Produktion in asymmetrischen Schwerionenreaktionen bei E/A = 600 MeV

Abstract

In this thesis the fragmentation of Au projectiles in collisions with light target nuclei ({sup 12}C, {sup 27}Al, {sup 64}Cu) is studied at a projectile energy of 600 MeV per nucleon. For the description of an event three observables are used: the multiplicity M{sub lp} of the light particles, the largest observed charge Z{sub max} of the projectile fragments, as well as a newly introduced obsevable Z{sub bound}, which is defined as the sum of all charge contained in complex projectile fragments (Z {>=} 2). By means of this observable different exit channels can be identified: the formation of a heavy residual nucleus by evaporation of light particles, the binary fission, the decay into IMF`s (3 {<=} Z {<=} 30) and the complete decay into light particles. At the applied incident energy in the case of Au+Cu reactions each of these decay channels can be realized. The observables Z{sub bound} and M{sub lpp} are proved as suited quantities for the reconstruction of the impact parameter. Furthermore independently on the target a universal relation between Z{sub bound} and the multiplicity distribution of medium-heavy fragments is found. By simple model assumptions it is made plausible that Z{sub bound} is correlated both with  More>>
Authors:
Publication Date:
Mar 01, 1992
Product Type:
Thesis/Dissertation
Report Number:
GSI-92-06
Reference Number:
SCA: 663450; 663520; 663530; 663550; PA: DEN-92:006997; SN: 92000759009
Resource Relation:
Other Information: TH: Diss. (Dr.rer.nat.); PBD: Mar 1992
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; CARBON 12 TARGET; GOLD 197 REACTIONS; ALUMINIUM 27 TARGET; COPPER 64 TARGET; SPALLATION; GEV RANGE 100-1000; LIGHT NUCLEI; INTERMEDIATE MASS NUCLEI; DEEP INELASTIC HEAVY ION REACTIONS; HEAVY ION FUSION REACTIONS; CHARGED PARTICLES; MULTIPLICITY; FISSION FRAGMENTS; SPALLATION FRAGMENTS; QUASI-FISSION; BINARY FISSION; EVAPORATION MODEL; EXPERIMENTAL DATA; IMPACT PARAMETER; DIFFERENTIAL CROSS SECTIONS; INTEGRAL CROSS SECTIONS; NUCLEAR REACTION YIELD; EXCITED STATES; 663450; 663520; 663530; 663550; HEAVY-ION-INDUCED REACTIONS AND SCATTERING; A = 6-19; A = 20-38; A = 59-89
OSTI ID:
10151168
Research Organizations:
Gesellschaft fuer Schwerionenforschung mbH, Darmstadt (Germany); Frankfurt Univ. (Germany). Fachbereich 13 - Physik
Country of Origin:
Germany
Language:
German
Other Identifying Numbers:
Other: ON: DE92528425; TRN: DE9206997
Availability:
OSTI; NTIS (US Sales Only); INIS
Submitting Site:
DEN
Size:
111 p.
Announcement Date:
Jul 05, 2005

Citation Formats

Hubele, J C. Study of the multi-fragment production in asymmetric heavy ion reactions at E/A = 600 MeV; Untersuchung der Multi-Fragment-Produktion in asymmetrischen Schwerionenreaktionen bei E/A = 600 MeV. Germany: N. p., 1992. Web.
Hubele, J C. Study of the multi-fragment production in asymmetric heavy ion reactions at E/A = 600 MeV; Untersuchung der Multi-Fragment-Produktion in asymmetrischen Schwerionenreaktionen bei E/A = 600 MeV. Germany.
Hubele, J C. 1992. "Study of the multi-fragment production in asymmetric heavy ion reactions at E/A = 600 MeV; Untersuchung der Multi-Fragment-Produktion in asymmetrischen Schwerionenreaktionen bei E/A = 600 MeV." Germany.
@misc{etde_10151168,
title = {Study of the multi-fragment production in asymmetric heavy ion reactions at E/A = 600 MeV; Untersuchung der Multi-Fragment-Produktion in asymmetrischen Schwerionenreaktionen bei E/A = 600 MeV}
author = {Hubele, J C}
abstractNote = {In this thesis the fragmentation of Au projectiles in collisions with light target nuclei ({sup 12}C, {sup 27}Al, {sup 64}Cu) is studied at a projectile energy of 600 MeV per nucleon. For the description of an event three observables are used: the multiplicity M{sub lp} of the light particles, the largest observed charge Z{sub max} of the projectile fragments, as well as a newly introduced obsevable Z{sub bound}, which is defined as the sum of all charge contained in complex projectile fragments (Z {>=} 2). By means of this observable different exit channels can be identified: the formation of a heavy residual nucleus by evaporation of light particles, the binary fission, the decay into IMF`s (3 {<=} Z {<=} 30) and the complete decay into light particles. At the applied incident energy in the case of Au+Cu reactions each of these decay channels can be realized. The observables Z{sub bound} and M{sub lpp} are proved as suited quantities for the reconstruction of the impact parameter. Furthermore independently on the target a universal relation between Z{sub bound} and the multiplicity distribution of medium-heavy fragments is found. By simple model assumptions it is made plausible that Z{sub bound} is correlated both with the size of the projectile residue and in the mean with its excitation energy. For the characterization of the decay into IMF`s the multiplicity M{sub imf} of these fragments is applied. For all three targets with increasing centrality first an increasing of the mean fragment multiplicities to maximal values of 3-4 is observed. In the case of the Cu target and suggestively also at the Al target in the most central collisions again a decreasing of the multiplicity is found. The universal Z{sub bound} behaviour is a hint to a - at least partial - equilibration of the primary projectile residue before the decay. (HSI). [Deutsch] In dieser Arbeit wird die Fragmentation von Au-Projektilen in Kollisionen mit leichten Targetkernen ({sup 12}C, {sup 27}Al, {sup 64}Cu) bei einer Projektilenergie von 600 MeV pro Nukleon untersucht. Zur Beschreibung eines Ereignisses werden drei Observablen herangezogen: die Multiplizitaet M{sub lp} der leichten Teilchen, die groesste beobachtete Ladung Z{sub max} der Projektilfragmente, sowie eine neu eingefuehrte Observable Z{sub bound}, die als die Summe aller in komplexen -Projektilfragmenten (Z {>=} 2) enthaltenen Ladung definiert ist. Mit Hilfe dieser Observablen koennen verschiedene Ausgangskanaele identifiziert werden: die Bildung eines schweren Restkerns durch Evaporation leichter Teilchen, die binaere Spaltung, den Zerfall in IMFs (3 {<=} Z {<=} 30) und den vollstaendigen Zerfall in leichte Teilchen. Bei der verwendeten Einschussenergie kann im Falle von Au+Cu-Reaktionen jeder dieser Zerfallskanaele realisiert werden. Die Observablen Z{sub bound} und M{sub lp} erweisen sich als geeignete Groesse zur Rekonstruktion des Stossparameters. Darueberhinaus findet man unabhaengig vom Target eine universelle Relation zwischen Z{sub bound} und der Multiplizitaetsverteilung mittelschwerer Fragmente. Mit einfachen Modellannahmen wird plausibel gemacht, dass Z{sub bound} sowohl mit der Groesse des Projektilrests als auch im Mittel mit dessen Anregungsenergie korreliert ist. Zur Charakterisierung des Zerfalls in IMFs wird die Multiplizitaet M{sub imf} dieser Fragmente verwendet. Fuer alle drei Targets beobachtet man mit zunehmender Zentralitaet zunaechst ein Anwachsen der mittleren Fragmentmultiplizitaet auf maximale Werte von 3-4. Im Falle des Cu-Targets, und andeutungsweise auch beim Al-Target, findet man bei den zentralsten Stoessen wieder eine Abnahme der Multiplizitaet. Das universelle Z{sub bound}-Verhalten ist ein Hinweis auf eine - zumindest teilweise - Equilibrierung des primaeren Projektilrests vor dem Zerfall. (orig.).}
place = {Germany}
year = {1992}
month = {Mar}
}