c# get cant element from xml

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C#5.0

i do youtube request and i get the xml stream result i pass the "streamResult"
to "Xdocument" , I managed to take all the parameters with the name spance like this :

durations = doc.Descendants(xmlNameSpace + "content").......

but the "published" element value i cant take this is the xml:

<feed xmlns="http://www.w3.org/2005/Atom".......>
  <id>http://gdata.youtube.com/feeds/api/videos</id> 
  <updated>2014-07-15T11:19:24.176Z</updated> 
  <category scheme="http://schemas.google.com/g/2005#kind">
  <link rel="http://schemas.google.com/g/2005#feed" type="application/atom+xml" href="http://gdata.youtube.com/feeds/api/videos" /> 
- <author>
  <name>YouTube</name> 
  <uri>http://www.youtube.com/</uri> 
  </author>
  <generator version="2.1" uri="http://gdata.youtube.com">YouTube data API</generator> 
  <openSearch:totalResults>125170</openSearch:totalResults> 
  <openSearch:startIndex>1</openSearch:startIndex> 
  <openSearch:itemsPerPage>25</openSearch:itemsPerPage> 
- <entry>
  <id>http://gdata.youtube.com/feeds/api/videos/GIk6kSdeIsA</id> 
  <published>2011-09-21T10:31:53.000Z</published> 
  <updated>2014-07-14T23:05:54.000Z</updated> 
  .....<entry>

i tray this code maby:

List<XElement> node = doc.Root.Descendants("entry").ToList();

please helppp :)