Projectile Fragmentation Characteristics of the Events Produced from 84 Kr+Emulsion Interaction at 1 A GeV

Projectile fragmentation is a rather well-isolated phenomenon within the complex context of highly energetic heavy-ion collisions with a multibaryon system. The projectile fragmentation study reveals the characteristics of the particles release out from the projectile spectator region. The goal of present investigation is to study the emission possibility of single event, double events and triple events for the single charge, double charge and multiple charge projectile fragments. The observation show that the emission possibility of single, double and triple events is depending on the types of the projectile fragments.


Introduction
2][3][4][5] Nuclear decentralization is a unique experimental miracle in nucleus-nucleus collision at relativistic energy. 1 The study of nuclear fragmentation provides the brief details about the reaction mechanism. 1The interactivity of two different nuclei can be easily described by the PS model. 2,3According to PS model two colliding nuclei can be split in three parts, projectile and target spectator region (PSR & TSR), and participant region (PR).The PSR and TSR are those regions which do not participate in the interaction, while the overlying region is called PR. 2 The goal of this work is to investigate the emission feature of the events release from the PSR at relativistic energy.

Experimental Details
The development of nuclear emulsion detector (NED) were execute at GSI Darmstadt, Germany with 84 Kr projectile having 1 GeV per nucleon, incident kinetic energy, (i.e. total energy was 84 GeV). 4 The dimension of NED plates was 9.8 x 9.8 x 0.06 cm 3 . 4,5The NED is a composite target detector. 5,6It contains Br, Ag, N, O, C and H having small percentage of I and S. 6 To search the event within NED plates, two well-known (line and volume) scanning techniques were adopted. 4,5n line scanning the event of interest is followed along their track/path till they interact or skip, while in volume scanning the event of interest is scanned strip by strip. 5To scan the event within NED plates, binocular microscope Olympus BH-2 was used. 4,5fter scanning and collecting the information of event, they are categorised in three main groups. 5irst is projectile fragments (PF), these events are released from the PSR. 2,5Second is target fragments (TF), these events are released from TSR. 2,5 Third is shower fragments, these events are released from PR. 2,5 Further the PF are divided into three main groups known as singly-charged PF (SCPF), doubly-charged PF (DCPF), and multiple-charge PF (MCPF). 7The events belongs to SCPF have unit charge (Z=1), the events belongs to DCPF have double charge (Z=2) and the events belongs to MCPF have multiple charge (Z>2).

Results and Discussions
The projectile fragmentation study reveals the characteristics of the particles released from the PSR.In this analysis, the emission possibility of single event, double events and triple events for the SCPF, DCPF and MCPF released from the interactivity of projectiles, 16 O (4.5 GeV per nucleon), 8 22 Ne (4.1 GeV per nucleon), 8 28 Si (4.5 GeV per nucleon), 8 and 84 Kr (1 GeV per nucleon) with NED are studied and reported.
The emission possibility of single event released in the interactivity of projectiles ( 16 O, 22 Ne, 28 Si, 84 Kr) with NED for SCPF, DCPF and MCPF is shown in figure 1. Figure 1 shows that the emission possibility of single event is highest in case of MCPF and lowest for SCPF.Thus the emission possibility of single event for all three types of PF is showing strong dependency on the types of PF.
Figure 2, shows the emission possibility of double event released in the interactivity of projectiles, ( 16 O, 22 Ne, 28 Si, 84 Kr) with NED for SCPF, DCPF and MCPF.From figure 2 it is clear that the emission possibility of double event is almost same in case of SCPF and DCPF while lowest for MCPF.Therefore the emission possibility of double events is also depending on the types of PF.
Three events emission possibility, released in the interactivity of projectiles,( 16 O, 22 Ne, 28 Si, 84 Kr) with NED for SCPF, DCPF and MCPF is shown in figure 3. Figure 3 reveals that the emission possibility of three events is highest in case of SCPF and lowest for MCPF.Again we can see that the emission possibility of three events is also depending on the types of PF.