摘要:

By photographing an oscilloscope it is possible to measure short periods ranging from 0.1 second to 5 seconds. The pulses from a Geiger counter are fed into thexaxis amplifier of an oscilloscope using no sweep. An oscillograph recorder is used to photograph the cathode‐ray tube so that a record of all the pulses from the counter is obtained. The activated target is moved from the bombardment position to the counting position in about 0.2 second by means of a pneumatic tube. Exposure of calcium to a 23‐Mev alpha‐particle beam resulted in an activity with a half‐life of 0.58±0.04 second. This activity may be assigned to Ti43produced by the reaction Ca40(&agr;,n)Ti43.

ISSN:0034-6748    

DOI:10.1063/1.1741296

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

In addition to the use of stopping potentials for the study of metastable ions in a mass spectrometer, there are several other important uses including the study of ions formed with kinetic energy. There are also several interesting phenomena associated with this method which were encountered when this arrangement was first used. A summary of the authors' experiences with this method is given for the benefit of those who might plan to use this arrangement in the future.

ISSN:0034-6748    

DOI:10.1063/1.1741297

出版商:AIP    

年代:1948

数据来源: AIP

摘要:

An array of sixteen, self‐quenching, Geiger counters is described, which employs a matrix of parallel, small diameter wires for electrodes. The gas atmosphere is common to all counters. The array and attendant recording circuit is used to observe the tracks of charged particles. A spurious count, caused by incomplete absorption of the photons by the polyatomic gas, occurs in a counter adjacent to the track for about 1.5 percent of the primary tracks.

ISSN:0034-6748    

DOI:10.1063/1.1741298

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741299

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741300

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741301

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741302

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741305

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741306

出版商:AIP    

年代:1948

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1741307

出版商:AIP    

年代:1948

数据来源: AIP