Interaction cross sections and negative pion multiplicities in nucleus-nucleus collisions at 4.2 GeV/c per nucleon

Abdrahmanov, E. O.; Basina, A.N.; Chasnikov, I.Ya.; Gaitinov, A. S.; Strel'tsov, I.S.; Vinitsky, A.Kh.; Abdinov, O.; Mehtiev, R. R.; Backović, S.; Drndarevic, S.; Krpić, D.; Sakota, V.; Balea, E.; Balea, O.; Boldea, V.; Hakman, S.; Ponta, T.; Gemesy, T.; Krasznovszky, S.; Pinter, D.; Kowalski, M.; Angelov, N.; Anoshin, A.I.; Ahababian, N.; Baatar, Ts.; Baldin, A.M.; Bartke, J.; Cheplakov, A.; Didenko, L.; Dzhmukhadze, S.V.; Gasparian, A.P.; Grecova, L. D.; Григалашвили, Н.; Grishin, V.G.; Ivanovskaja, I. A.; Jenik, L.; Kanarek, T.; Kladnitskaya, E.N.; Kopylova, D.K.; Lyubimov, V.B.; Lyutov, S.I.; Mel'nikova, N.N.; Nikitina, V.F.; Popova, V.M.; Shcheglova, L.M.; Shklovskaya, A.I.; Solomin, A.; Soloviev, M. I.; Sulejmanov, M.K.; Toneeva, G.P.; Tuvdendorzh, D.; Erofeeva, I.; Murzin, V. S.; Smirnova, L. N.; Korbel, Z.; Trka, Z.; Trkova, Ya.; Kerachev, P.P.; Markov, P.K.; Semerdzhiev, H.; Azimov, S.A.; Inogamov, Sh.V.; Turdaliev, K.T.; Yuldashev, A. A.; Yuldashev, B. S.; Amaglobeli, N.S.; Dasaeva, M.; Makharadze, T.G.; Tevzadze, Yu.V.; Topuridze, M.V.; Tsivtsivadze, E.T.; Chadraa, B.; Dalkhazhav, N.; Togoo, R.; Armutlijsky, D.; Prokopeva, S.; Białkowska, H.; Kiełczewska, D.; Lang, K.; Gulkanian, G.R.; Kirakosian, Z.A.; Korchagin, S.A.; Vartanian, V. A.

doi:10.1007/bf01546951

Cited by 43 publications

(5 citation statements)

References 15 publications

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“…where A i and A t are the atomic weight of incident and target nuclei. This model is known to reproduce data on nuclear interactions for various combinations of A i and A t including the proton [13]. The resultant σ(He, A t ) agrees (within an accuracy of 10 %) with measured helium cross sections on targets such as C or Al.…”

mentioning

confidence: 52%

A new limit on the flux of cosmic antihelium

Saeki¹,

Anraku²,

Orito³

et al. 1998

Physics Letters B

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A very sensitive search for cosmic-ray antihelium was performed using data obtained from three scientific flights of BESS magnetic rigidity spectrometer. We have not observed any antihelium; this places a model-independent upper limit (95 % C.L.) on the antihelium flux of 6 × 10 −4 m −2 sr −1 s −1 at the top of the atmosphere in the rigidity region 1 to 16 GV, after correcting for the estimated interaction loss of antihelium in the air and in the instrument. The corresponding upper limit on the He/He flux ratio is 3.1 ×10 −6 , 30 times more stringent than the limits obtained in similar rigidity regions with magnetic spectrometers previous to BESS. PACS numbers: 98.80.Cq, 98.70.Sa, 98.80.Bp, 98.90.+s Cosmic-ray observations provide most direct evidence for our Galaxy being composed mostly by baryons. This baryon-antibaryon asymmetry can be global in the Universe, being created in the very early Universe due to the violations of CP and of baryon-number. However, depending on the nature of CP violation, baryon-symmetric models are conceivable [1] in which the Universe is separated into an equal number of matter-and antimatterdomains. Whereas γ-ray observations place strong limitations on the antimatter in our Galaxy and in the local cluster of galaxies, the domain structure could still exist beyond this scale. Although antihelium might be in principle produced in cosmic-ray interactions, their contribution to the He/He flux ratio is expected to be much smaller than 10 −12 [2]. Detecting antihelium at a level higher than this could therefore provide the evidence of antimatter domains or of other exotic phenomena such as superconducting strings in our Galaxy [3]. For further discussion of astrophysical considerations regarding the search for antihelium see the references [4,5]. We report in this letter (for more detail see [6]) a sensitive search for antihelium using the data from the '93, '94, and '95 flights of BESS detector, and provide model-independent upper limits on the absolute antihelium flux as well as on the He/He flux ratio. A limit on the flux ratio from an early analysis of '95 data is published elsewhere [4]. Fig. 1 shows front-and side-views of the BESS '95 instrument. The cylindrical configuration provides a wide tracking region and an acceptance of up to 0.32 m 2 sr depending on the off-line fiducial cuts. From inside to outside, it includes a jet-type drift (JET) chamber, in- * This work is dedicated to the memory of Dr. R. Golden.ner drift chambers (IDCs), a superconducting solenoid, outer drift chambers (ODCs), and a time of flight (TOF) hodoscope. The solenoid produces a magnetic field of 1 T with an uniformity of ±15% inside the bore.The JET chamber [7], as the key tracking detector, measures up to 24 points per track three-dimensionally, each with the resolution [8] of 200 µm in rφ plane and of 2 cm in z-position (a cylindrical coordinate (rφz) is determined by defining the magnetic field direction as z-axis). Each of the IDCs and ODCs consists of two 12-mmthick drift layers which are divid...

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mentioning

confidence: 52%

A new limit on the flux of cosmic antihelium

Saeki¹,

Anraku²,

Orito³

et al. 1998

Physics Letters B

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“…The anti-deuteron nucleus total absorption cross section was then obtained by multiplying this by the factor A 2/3 where A is the atomic weight of the target nucleus. Such an A dependence was roughly observed to describe the deuteron-nucleus measurements [34][35][36]. This method gave 24% for the fraction of anti-deuterons lost by nuclear interactions.…”

Section: Detection Efficiency For Anti-deuteronsmentioning

confidence: 98%

Deuteron and anti-deuteron production in e+e− collisions at the Z resonance

Schael¹,

Barate²,

Brunelière³

et al. 2006

Physics Letters B

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Deuteron and anti-deuteron production in Z decays has been observed in the ALEPH experiment at LEP. The production rate of anti-deuterons is measured to be (5.9 ± 1.8 ± 0.5) × 10 −6 per hadronic Z decay in the anti-deuteron momentum range from 0.62 to 1.03 GeV/c. The coalescence parameter B 2 , which characterizes the likelihood of anti-deuteron production, is measured to be 0.0033 ± 0.0013 GeV 2 in Z decays. These measurements indicate that the production of anti-deuterons is suppressed in e + e − collisions compared to that in pp and photoproduction collisions.

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“…5. Although ai, was calulated in different ways (for protons as projectiles Caroll's [8] calculation applies, while for heavier alphas we used relation of Abdrahmanov et al [9]), an useful observation is that values of probability for fission for e and p induced interactions are very close to each other. This phenomenon can be attributed to the fact that increase of projectile dimensions leads to increase of both total cross sections for inelastic interactions and cross section for binary events at the same rate.…”

Section: ;mentioning

confidence: 98%

Cross sections for interactions of 8.8 GeVα particles with Ag, Au, Bi and Th

Lazic

Todorović

1990

Z. Physik A - Atomic Nuclei

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Makrofol was used as 4~ track detector to determine reaction cross sections of Ag, Au, Bi and Th induced by 8.8 GeV e particles. The variation of cross sections as functions of the Z2/A parameter of the target has been investigated. Data concerning geometry of events, momentum transfer and fission probabilities were discussed in order to discern fission products from those originating from more violent processes. Comparison with proton data has been done and differences were discussed.

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Interaction cross sections and negative pion multiplicities in nucleus-nucleus collisions at 4.2 GeV/c per nucleon

Cited by 43 publications

References 15 publications

A new limit on the flux of cosmic antihelium

A new limit on the flux of cosmic antihelium

Deuteron and anti-deuteron production in e+e− collisions at the Z resonance

Cross sections for interactions of 8.8 GeVα particles with Ag, Au, Bi and Th

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