摘要:

Radio‐frequency pulse apparatus is described for nuclear magnetic and pure quadrupole spin‐echo and free induction decay experiments in the 15 to 42 Mc frequency range. Nuclear spin relaxation times between 20 &mgr;sec and 50 sec have been measured with the apparatus. Simple cryostats provide temperatures from 100° to 500°K.

ISSN:0034-6748    

DOI:10.1063/1.1716004

出版商:AIP    

年代:1958

数据来源: AIP

摘要:

An apparatus used to observe the energy spectrum of protons in coincidence with 14‐Mev deuteron‐induced fission is described. One feature is a mass identifier which operates over a range of 5 to 25 Mev and gives good separation of protons, deuterons, and tritons. Its operation depends on measuring the particle energy loss, &Dgr;E, in a transmission counter and the residual energy,E, in a separate counter. TheEand &Dgr;Epulses are introduced into an electronic computer which in 1 &mgr;sec produces a pulse whose height is closely proportional to mass. The accuracy of mass separation is illustrated by a representative case in which less than 0.1% of the elastically scattered deuterons appear in the proton energy spectrum. In the presence of the complicating effects of cyclotron beam modulation, the chance coincidence correction to the proton‐fission coincidence spectrum is made by simultaneously measuring the delayed and undelayed spectra.

ISSN:0034-6748    

DOI:10.1063/1.1716005

出版商:AIP    

年代:1958

数据来源: AIP

摘要:

The response of a four‐inch long by five‐inch diameter sodium‐iodide crystal to axially incident 0.01‐ to 8‐Mev x‐rays has been expressed as a 28 by 28 matrix. Measured pulse‐height distributions were combined with Monte Carlo calculated distributions for the input data. The matrix was inverted on an automatic computer for ease of application to spectra. The mesh is uniform in the square root of energy, each interval including an entire photopeak. Such a coarse mesh makes the response matrix suitable for the unscrambling of continuous but not line spectra.

ISSN:0034-6748    

DOI:10.1063/1.1716006

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716007

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716008

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716009

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716011

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716012

出版商:AIP    

年代:1958

数据来源: AIP

ISSN:0034-6748    

DOI:10.1063/1.1716013

出版商:AIP    

年代:1958

数据来源: AIP