摘要:

The proton nuclear magnetic resonance is observed in two crossed capillary tubes embedded in a paramagnetic material in a constant external field. The resonance frequencies from the two capillaries depend on the respective demagnetizing factors. For Mn2O3the two resonance lines are separated by 13.0 kc at 22.3 Mc, giving a mass susceptibility of 65×10−6cgs, in agreement with values obtained by other methods. For a magnetic field homogeneity of about one part in 107over the sample, the ultimate sensitivity of the method would be 10−7to 10−8susceptibility unit. Measurements can be made at low temperatures.

ISSN:0034-6748    

DOI:10.1063/1.1771280

出版商:AIP    

年代:1955

数据来源: AIP

摘要:

A high‐resolution ion pulse analyzer has been developed for the study of alpha‐decay fine structure. Alpha‐particle spectra are distorted in conventional high geometry measurements by addition of ionization from excited‐state radiations of the daughter atom. Covering the sample foil with electroformed nickel mesh of a few mils thickness proved to be an effective technique for collimating the alpha particles and absorbing coincident excited‐state radiations. The resolution of the instrument was tested with samples of Bi212, Th230, and Pu238. The measured intensities and particle energies are in satisfactory agreement with magnetic deflection data. Alpha peak standard deviations of 12–13 kev were obtained at a detection efficiency of 0.04 count per disintegration. The standard deviation due to amplifier noise alone amounted to 10 kev.

ISSN:0034-6748    

DOI:10.1063/1.1771281

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1771285

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1771286

出版商:AIP    

年代:1955

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1771288

出版商:AIP    

年代:1955

数据来源: AIP