Alpha-alpha and alpha-proton interactions in the CERN intersecting storage rings

doi:10.1016/0375-9474(82)90258-5

Nuclear Physics A

Volume 374, 25 January 1982, Pages 461-474

https://doi.org/10.1016/0375-9474(82)90258-5 Get rights and content

Abstract

Alpha-alpha and alpha-proton collisions have been studied for c.m. energies of 125 and 88 GeV, respectively, in different experiments at the CERN ISR. Some results obtained so far for elastic scattering, inelastic interactions, and production of particles with large transverse momenta will be reported.

References (25)

J. Jaros
Phys. Rev. C
(1976)
L. Bertocchi
M.A. Faessler
Letter of Intent
CERN/ISRC/79-3
(1979)
K. Braune
Proposal to the ISRC
CERN/ISRC/79-10, ISRC/P101
(1979)
L. Bernard
CERN/PS/OP/Note 80-27
(1980)
H. Boutheon
CERN/PS/LR 81-14
(1981)
M.G. Albrow et al.
Physics with α particles
A. Bujak
Phys. Rev. D
(1981)
J. Berger
R.J. Glauber
G. Goggi
Nucl. Phys.
(1979)
E.S. Abers
Nuovo Cimento
(1966)
V.N. Gribov
Zh. Eksper. Teor. Fiz
(1969)
Sov. Phys. JETP
(1969)

A. Gurtu

Pramana

(1974)

S.J. Brodsky

Phys. Rev. Lett.

(1977)

Cited by (7)

The total neutral energy spectra in the central region of α-α, d-d and p-p interactions at s<inf>NN</inf> = 31 GeV per nucleon pair at the CERN ISR
1984, Physics Letters B
The spectra in total neutral energy, E^TOT⁰, have been measured in pp, dd and αα collisions at centre-of-mass energy per nucleon pair, $s_{NN}$ , of 31 GeV. The range in E_TOT⁰ covered was 1 to 19 GeV in pp, 18 to 24 GeV in dd and 1 to 34 GeV in αα interactions. The ratio of the αα to the pp spectra rises monotonically from 7 at E_TOT⁰ = 1.5 GeV to 10⁵ at E_TOT ⁰ = 19 GeV. Since E_TOT⁰ is the sum over many particles in the detector, it is directly sensitive to multiple nucleon-nucleon collisions in the interacting α particles. The αα spectrum in the range 8 < E_TOT⁰ < 17 GeV is consistent with being described by a simple model of 4 simultaneous nucleon-nucleon collisions with a cross section about equal to 10% of the observed αα interaction cross section. The spectrum of E_TOT⁰ above 17 GeV is even flatter than this extreme case where four nucleon pairs are interacting.
Elastic scattering of α particles on light nuclei at P<inf>α</inf>=7 GeV/c
1984, Physics Letters B
Observation of the anomalous nuclear enhancement in the neutral energy spectrum in the central region of α-α interactions at √s = 124 GeV AT the cern ISR
1984, Nuclear Physics, Section A
Quark matter formation and heavy ion collisions. A general review and status report
1982, Physics Reports
The reasons which lead one to expect that, at high enough density and (or) high enough temperature, a new form of matter—the quark-gluon plasma-should exist, are reviewed and discussed. It is shown that the relevant values of the density and temperature are likely to be met in head-on heavy ion collisions provided that the incident ion energy is in the range of 100 GeV per nucleon. The experimental observation of the expected signals is discussed. Recent information on αα collisions at ISR energy is reviewed. Built out of separate contributions which can be read independently of one another, this review provides a global approach to the question of quark matter and its possible observation in heavy ion collisions.
Measurements of elastic scattering in alpha-alpha and alpha-proton collisions at the CERN intersecting storage rings
1982, Physics Letters B
We measured the elastic scattering of $αα at s = 126 GeV$ and of αp at $s = 89 GeV$ . For αα, the differential cross section dσ/dt has a diffractive pattern minima at |t| = 0.10 and 0.38 GeV². At small |t| = 0.05−0.07 GeV², this cross section behaves like exp[(100 ± 10) t]. Extrapolating a fit to the data to the optical point, we obtained for the total cross section α_tot(αα) = 250 ± 50 mb and an integrated elastic cross section σ_e1(αα) = 45 ± mb. Another method of estimating σ_tot(αα), based on measuring the interaction rate, yielded 295 ± 40 mb. For αp, dσ/dt has aminimum at |t| = 0.20 GeV², and for 0.05 < |t| < 0.18 GeV² behaves like exp[(41 ± 2) t]. Extrapolating this slope to |t| = 0, we found σ_tot(αp) = 130 ± 20 and σ_e1(αp) = 20 ± 4mb. Results on pp elastic scattering at $s = 63 GeV$ agree with previous ISR experiments.
Particle production in high-energy hadron-nucleus interactions
1983, Zeitschrift für Physik C Particles and Fields

View all citing articles on Scopus

View full text

Alpha-alpha and alpha-proton interactions in the CERN intersecting storage rings

Abstract

Phys. Rev. C

Letter of Intent

CERN/ISRC/79-3

Proposal to the ISRC

CERN/ISRC/79-10, ISRC/P101

CERN/PS/OP/Note 80-27

CERN/PS/LR 81-14

Physics with α particles

Phys. Rev. D

Nucl. Phys.

Nuovo Cimento

Zh. Eksper. Teor. Fiz

Sov. Phys. JETP

Pramana

Phys. Rev. Lett.