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ANTIPOV 1970

Antipov, Y.M. et al.
Observation of anti-³He
Yad. Phys. 12 (1970) 311; Sov. J. Nucl. Phys. 12 (1971) 171;

Abstracts
Observation is reported of anti-³He nuclei in the beam of negative particles produced by 70 BeV protons in an aluminum target. Among 2.4 ´ 10 11 particles which passed through the apparatus, five anti-³He nuclei have been identified on the basis of their electric charge and velocity by means of scintillation and Cerenkov counters. The anti-³He mass was found to be M _anti-³He = (1.00 ± 0.03)3 m_p, and the charge Z = (0.99 ± 0.03)2e. The ratio of the differential cross sections for production of anti-³He nuclei (p = 20 BeV/c) and π^– mesons (p = 10 BeV/c) is 2 ´ 10^-11, which corresponds to a production cross section for antihelium 3 of d²σ _anti-³He/dΩdp = 2.0 ´ 10^-35 cm²/sr-(BeV/c) per Al nucleus and 2.2 ´ 10^-36 cm²/sr-(BeV/c) per nucleon.

Accelerator SERP Detectors CNTR

Related references
More (later) information appears in
Y. M. Antipov et al., Nucl. Phys. B31 (1971) 235;
See also
B. Cork et al., Phys. Rev. 104 (1956) 1193;
M. Baldo-Ceolin and D. J. Prowse, Bull.Am.Phys.Soc. 3 (1958) 163;
J. Button et al., Phys. Rev. Lett. 4 (1960) 530;
F. Binon et al., Phys. Lett. 30B (1969) 510;
A. Liland and N. P. Pilkuhn, Phys. Lett. 29B (1969) 663;
V. M. Maksimenko, I. N. Sisakian, E. L. Feinberg, and D. S. Chernavsky, Pisma Zh. Eksp. Teor. Fiz. 3 (1966) 340;
D. E. Dorfan et al., Phys. Rev. Lett. 14 (1965) 1003;
Y. M. Antipov et al., Yad. Phys. 10 (1969) 346;
S. V. Donskov et al., Prib.Tech.Exp. 3 (1969) 60;
A. F. Dunaitsev, V. I. Petrukhin, Y. D. Prokoshkin, and V. I. Rykalin, Prib.Tech.Exp. 2 (1965) 114;
Y. B. Bushnin et al., Yad. Phys. 10 (1969) 585;
O. Chamberlain, E. Segrè, C. Wiegand, and T. Ypsilantis, Phys. Rev. 109 (1958) 947;
F. Binon et al., Phys. Lett. 30B (1969) 506;

Reactions

	p Al π– X	70 GeV (Plab)	angp
	p Al anti-deuteron X	70 GeV (Plab)	angp
	p Al anti-3He X	70 GeV (Plab)	angp

Particles studied

anti-3He

ex, mass, qn

Record comments
First evidence for anti-³He production.

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