Nuclear Interactions of 400-{GeV} Protons in Emulsion

Journal Article · Sun Jan 01 04:00:00 EST 1978 · Nucl.Phys.B

DOI:https://doi.org/10.1016/0550-3213(78)90223-7· OSTI ID:1847312

Otterlund, I.

We report on 400 GeV proton-emulsion nucleus reactions and compare the results to hadron-nucleus reactions at smaller energies. In particular we present results on the emission of fast target protons (essentially grey track particles) and on their correlation with the number of collisions inside the nucleus, ν, with the number of charged evaporated particles (essentially black track particles) and with the number of pions produced (essentially shower particles). We observe that the main features of the 200–400 GeV data are very similar. However, we find that the mean shower-particle multiplicity at 400 GeV is essentially higher than expected from the simple independent particle model prediction $$\langle$$ n s $$\rangle$$ = $$\langle$$ n ch $$\rangle$$[1 + 0.5($$\langle$$ ν $$\rangle$$ - 1)]. The shower particle multiplicities do not seem to follow a target mass dependence of the form $$\langle$$ n s $$\rangle$$ = $$\langle$$ n ch $$\rangle$$ A α with α = 0.14 or α = 0.19 as has been suggested in the literature. The pseudo-rapidity distribution shows limiting target and projectile fragmentation. The shower-particle multiplicity in the “central region” increases linearity with $$\langle$$ ν$$\rangle$$ but faster than 0.5$$\langle$$ ν$$\rangle$$ times the corresponding multiplicity in pp reactions.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1847312
• Report Number(s): FERMILAB-PUB-78-124-E; LUIP-7804; oai:inspirehep.net:132042
• Journal Information: Nucl.Phys.B, Journal Name: Nucl.Phys.B Vol. 142
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS