Improved measurement of the neutron absorption cross section for very low velocities

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• 作者：J. Schroffeneggerp>ap>p> ; p>p>dp>p> ; p>p>juri.schroffenegger@tum.de" class="auth_mail" title="E-mail the corresponding authorp> ; P. Fierlingerp>bp> ; A. Holleringp>dp> ; P. Geltenbortp>cp> ; T. Lauerp>dp> ; H. Rauchp>ap> ; T. Zechlaup>dp>
• 关键词：Neutron transport ; diffusion and moderation ; Protons and neutrons
• 刊名：Physics Letters B
• 出版年：2016
• 出版时间：10 January 2016
• 年：2016
• 卷：752
• 期：Complete
• 页码：212-216
• 全文大小：860 K

文摘

The absorption cross section of natural Gd and isotopic enriched p>157p>Gd for ultra-cold neutrons (UCN) as a function of the velocity has been measured within a time-of-flight-experiment. Particular attention is paid to small velocities in the region of a few m/s. This is intended to determine the validity of the pan id="mmlsi1" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315008783&_mathId=si1.gif&_user=111111111&_pii=S0370269315008783&_rdoc=1&_issn=03702693&md5=2ccf8094a32233fb21b204bf39ac4ca2" title="Click to view the MathML source">1/vpan>pan class="mathContainer hidden">pan class="mathCode">$1/v$pan>pan>pan>-law governing absorption cross sections in this region and the resulting divergence at pan id="mmlsi2" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315008783&_mathId=si2.gif&_user=111111111&_pii=S0370269315008783&_rdoc=1&_issn=03702693&md5=15e026ff6118d5d026717c5beed27a4f" title="Click to view the MathML source">v=0pan>pan class="mathContainer hidden">pan class="mathCode">$v=0$pan>pan>pan>. The experiment does not show any significant violation of pan id="mmlsi1" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315008783&_mathId=si1.gif&_user=111111111&_pii=S0370269315008783&_rdoc=1&_issn=03702693&md5=2ccf8094a32233fb21b204bf39ac4ca2" title="Click to view the MathML source">1/vpan>pan class="mathContainer hidden">pan class="mathCode">$1/v$pan>pan>pan> for pan id="mmlsi3" class="mathmlsrc">pan class="formulatext stixSupport mathImg" data-mathURL="/science?_ob=MathURL&_method=retrieve&_eid=1-s2.0-S0370269315008783&_mathId=si3.gif&_user=111111111&_pii=S0370269315008783&_rdoc=1&_issn=03702693&md5=1cc0dfab3507535d796202d0c9c8346f" title="Click to view the MathML source">v>3 m/span>pan class="mathContainer hidden">pan class="mathCode">$v>3\text{m}/\text{s}$pan>pan>pan>.