摘要:

Work on the secondary cosmic radiation carried‐out over the period 1929–1947 is reviewed describing first the experimental demonstration that the penetrating cosmic rays are new unstable particles of intermediate mass (‘‘mesotrons’’), for a long time incorrectly identified with the Yukawa mediator of nuclear forces. Some emphasis is then given to the investigations of the behavior of mesotrons at rest in nuclear matter; investigations which led to the discovery of a second charged lepton (the muon) and to the concept of a universal Fermi interaction. The discovery of the first strong interacting meson, the charged pion, ‘‘father’’ of the muon, is briefly recalled.

ISSN:0094-243X    

DOI:10.1063/1.45436

出版商:AIP    

年代:1994

数据来源: AIP

摘要:

A personal account of the early history of the discovery of the strange particles.

ISSN:0094-243X    

DOI:10.1063/1.45428

出版商:AIP    

年代:1994

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.45455

出版商:AIP    

年代:1994

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.45446

出版商:AIP    

年代:1994

数据来源: AIP

摘要:

An account is given of the author’s involvement in early tests of parity and time reversal symmetry. A brief summary is also given of his most recent experiments on these symmetries.

ISSN:0094-243X    

DOI:10.1063/1.45450

出版商:AIP    

年代:1994

数据来源: AIP

摘要:

A critical analysis of the contributions which lead, in the early period, to the discovery of the universality of Fermi type weak interactions is made. In particular the current references to this universality as ‘‘Puppi’s triangle’’ are shown to be incorrect.

ISSN:0094-243X    

DOI:10.1063/1.45451

出版商:AIP    

年代:1994

数据来源: AIP

ISSN:0094-243X    

DOI:10.1063/1.45454

出版商:AIP    

年代:1994

数据来源: AIP

摘要:

The hypothesis of associated production ofVparticles and the strangeness scheme developed in the early fifties in Japan are reviewed from an historical point of view.

ISSN:0094-243X    

DOI:10.1063/1.45422

出版商:AIP    

年代:1994

数据来源: AIP

摘要:

The significance of the semileptonic decays of &Sgr;+, &Sgr;−, and &lgr;0to the cvc theory of weak interactions is discussed. (AIP)

ISSN:0094-243X    

DOI:10.1063/1.45423

出版商:AIP    

年代:1994

数据来源: AIP

摘要:

This paper reviews briefly the history of the data and the arguments which led to the conclusion in 1956 that the &thgr;‐ and &tgr;‐modes ofK+decay led to final states which (for the same spin value) did not have the same parity, the puzzle concerning their relationship which led to the Lee‐Yang hypothesis that parity is not conserved in the weak interactions. It discusses also an alternative line of argument and experiment which might have been followed up at that time, and the possible reasons why physicists were so reluctant to embrace parity non‐conservation.

ISSN:0094-243X    

DOI:10.1063/1.45424

出版商:AIP    

年代:1994

数据来源: AIP