ISSN:0031-9228    

DOI:10.1063/1.2811073

出版商:AIP    

年代:1989

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2811074

出版商:AIP    

年代:1989

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2811076

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

There was great rejoicing, and considerable relief, at the Stanford Linear Accelerator Center on the morning of 12 April. The Stanford Linear Collider (SLC) had finally recorded its firstZ0particle—two years after the last piece of this unique electron‐positron accelerator was put in place.

ISSN:0031-9228    

DOI:10.1063/1.2811077

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

Liquid helium in the superfluid phase behaves as if a fraction of the liquid has zero viscosity—the liquid flows through narrow tubes even when there is no pressure gradient across the tubes' ends. This “superfluid fraction” is zero above the critical temperature for the onset of superfluidity, and it increases to unity when the temperature is decreased to absolute zero in the superfluid phase. When pure helium is three dimensional—for example, when it fills a beaker—the critical temperature for superfluidity is 2.17 K. When only a thin film of helium covers a plane substrate, however, the critical temperature depends on the film thickness and the substrate. Since the late 1970s, when our understanding of the superfluid transition in two and three dimensions was essentially completed, experimenters have been studying the superfluid transition when helium fills pores, on the order of a few tens of angstroms in size, in highly connected porous structures. These experiments have shown features in the past few years that both theorists and experimenters say they do not understand.

ISSN:0031-9228    

DOI:10.1063/1.2811078

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

The neutrino is the elementary particle postulated by Wolfgang Pauli to account for the apparent nonconservation of energy in nuclear beta decay. Neutrinos are now believed to exist in at least three varieties, or “flavors,” labeled&ngr;e,&ngr;&mgr;and&ngr;&tgr;and distinguished by the way they interact. There are also three antineutrinos,&ngr;¯e,&ngr;¯&mgr;and&ngr;¯&tgr;.

ISSN:0031-9228    

DOI:10.1063/1.881173

出版商:AIP    

年代:1989

数据来源: AIP

摘要:

Few modern discoveries have influenced mankind so rapidly and so profoundly as has nuclear fission, and few have had such an intricate history. Thus it is natural that the discovery of fission by Otto Hahn and Fritz Strassmann in December 1938 is remembered and commemorated in many places on its 50th anniversary. I participated in the early experiments in Rome, and later in the US, and I knew most of the principals well, except for Strassmann. I will try to present a brief outline of the discovery and its antecedents.

ISSN:0031-9228    

DOI:10.1063/1.881174

出版商:AIP    

年代:1989

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2811079

出版商:AIP    

年代:1989

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2811080

出版商:AIP    

年代:1989

数据来源: AIP

ISSN:0031-9228    

DOI:10.1063/1.2811081

出版商:AIP    

年代:1989

数据来源: AIP