Search for Positronium Lyman α-Radiation from Positrons Stopped in Inert Gases*
Identifieur interne : 000183 ( Pmc/Corpus ); précédent : 000182; suivant : 000184Search for Positronium Lyman α-Radiation from Positrons Stopped in Inert Gases*
Auteurs : Marvin LeventhalSource :
- Proceedings of the National Academy of Sciences of the United States of America [ 0027-8424 ] ; 1970.
Abstract
An attempt to detect the positronium Lyman α-radiation at 2430 Å is reported. Positrons from an intense 64Cu source (20 Ci) were stopped in high purity A, Ne, and He at pressures ranging from 0.01 to 3.0 atm. Light from the stopping region was collected by a large solid-angle light pipe and directed to a photomultiplier. Spectra were obtained by inserting a series of optical interference filters in front of the photomultiplier. Identical spectra were obtained with an intense electron emitter replacing the 64Cu source. These results indicate that any Lyman α-radiation present at the photomultiplier is masked by a large background continuum associated with gas excitation processes. The data were employed to set an upper limit of 1 in 2000 on those positrons stopping in the gas which result in Lyman α-radiation.
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PubMed: 16591834
PubMed Central: 286079
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en">Search for Positronium Lyman α-Radiation from Positrons Stopped in Inert Gases<xref ref-type="fn" rid="fn1"><sup>*</sup></xref></title><author><name sortKey="Leventhal, Marvin" sort="Leventhal, Marvin" uniqKey="Leventhal M" first="Marvin" last="Leventhal">Marvin Leventhal</name></author></titleStmt><publicationStmt><idno type="wicri:source">PMC</idno><idno type="pmid">16591834</idno><idno type="pmc">286079</idno><idno type="url">http://www.ncbi.nlm.nih.gov/pmc/articles/PMC286079</idno><idno type="RBID">PMC:286079</idno><date when="1970">1970</date><idno type="wicri:Area/Pmc/Corpus">000183</idno><idno type="wicri:explorRef" wicri:stream="Pmc" wicri:step="Corpus" wicri:corpus="PMC">000183</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Search for Positronium Lyman α-Radiation from Positrons Stopped in Inert Gases<xref ref-type="fn" rid="fn1"><sup>*</sup></xref></title><author><name sortKey="Leventhal, Marvin" sort="Leventhal, Marvin" uniqKey="Leventhal M" first="Marvin" last="Leventhal">Marvin Leventhal</name></author></analytic><series><title level="j">Proceedings of the National Academy of Sciences of the United States of America</title><idno type="ISSN">0027-8424</idno><idno type="eISSN">1091-6490</idno><imprint><date when="1970">1970</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en"><p>An attempt to detect the positronium Lyman α-radiation at 2430 Å is reported. Positrons from an intense <sup>64</sup>Cu source (20 Ci) were stopped in high purity A, Ne, and He at pressures ranging from 0.01 to 3.0 atm. Light from the stopping region was collected by a large solid-angle light pipe and directed to a photomultiplier. Spectra were obtained by inserting a series of optical interference filters in front of the photomultiplier. Identical spectra were obtained with an intense electron emitter replacing the <sup>64</sup>Cu source. These results indicate that any Lyman α-radiation present at the photomultiplier is masked by a large background continuum associated with gas excitation processes. The data were employed to set an upper limit of 1 in 2000 on those positrons stopping in the gas which result in Lyman α-radiation.</p></div></front></TEI><pmc article-type="research-article"><pmc-comment>The publisher of this article does not allow downloading of the full text in XML form.</pmc-comment>
<front><journal-meta><journal-id journal-id-type="nlm-ta">Proc Natl Acad Sci U S A</journal-id><journal-title>Proceedings of the National Academy of Sciences of the United States of America</journal-title><issn pub-type="ppub">0027-8424</issn><issn pub-type="epub">1091-6490</issn></journal-meta><article-meta><article-id pub-id-type="pmid">16591834</article-id><article-id pub-id-type="pmc">286079</article-id><article-categories><subj-group subj-group-type="heading"><subject>Physical Sciences: Physics</subject></subj-group></article-categories><title-group><article-title>Search for Positronium Lyman α-Radiation from Positrons Stopped in Inert Gases<xref ref-type="fn" rid="fn1"><sup>*</sup></xref></article-title></title-group><contrib-group><contrib contrib-type="author"><name><surname>Leventhal</surname><given-names>Marvin</given-names></name><xref ref-type="author-notes" rid="au1">†</xref></contrib></contrib-group><aff id="af1">DEPARTMENT OF PHYSICS, YALE UNIVERSITY, NEW HAVEN, CONNECTICUT</aff><author-notes><fn id="au1"><label>†</label><p> Present address: Bell Telephone Laboratories, Murray Hill, N.J.</p></fn><fn id="fn1"><label>*</label><p> Research supported in part by the General Physics Division, U.S. Air Force Office of Scientific Research (SRPP).</p></fn></author-notes><pub-date pub-type="ppub"><month>05</month><year>1970</year></pub-date><volume>66</volume><issue>1</issue><fpage>6</fpage><lpage>12</lpage><abstract><p>An attempt to detect the positronium Lyman α-radiation at 2430 Å is reported. Positrons from an intense <sup>64</sup>Cu source (20 Ci) were stopped in high purity A, Ne, and He at pressures ranging from 0.01 to 3.0 atm. Light from the stopping region was collected by a large solid-angle light pipe and directed to a photomultiplier. Spectra were obtained by inserting a series of optical interference filters in front of the photomultiplier. Identical spectra were obtained with an intense electron emitter replacing the <sup>64</sup>Cu source. These results indicate that any Lyman α-radiation present at the photomultiplier is masked by a large background continuum associated with gas excitation processes. The data were employed to set an upper limit of 1 in 2000 on those positrons stopping in the gas which result in Lyman α-radiation.</p></abstract></article-meta></front></pmc></record>Pour manipuler ce document sous Unix (Dilib)
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