Low energy solar neutrinos detected

[docm]

Link....<br /><br /><blockquote><font class="small">In reply to:</font><hr /><p><b>After 4.5 Billion Years, Sunshine Finally Figured Out</b><br /><br />A giant underground experiment has given researchers their first glimpse into the heart of the sun and the subatomic particles that shine down on Earth everyday.<br /><br />Scientists have long theorized how these particles, called neutrinos, are formed in the solar inferno, but direct proof has been hard to come by. Neutrinos can give scientists a priceless glimpse into the inner workings of the sun because they arrive on Earth virtually unchanged from when they left the sun's interior.<br /><br />Princeton researchers, working at the underground Gran Sasso National Laboratory in Italy, have made the first real-time observations of low-energy solar neutrinos, fundamental particles that are created by the roiling nuclear reactions inside the sun and that stream in vast numbers from the sun's core.<br /><br />In stars about the size of the sun, most solar energy is produced by a complex chain of nuclear reactions that convert hydrogen into helium. These reactions can take several different routes, but they all end in the same product: sunshine.<br /><br />Steps along two of the routes require the presence of the element beryllium, and physicists have theorized that these steps are responsible for creating about 10 percent of the sun's neutrinos.<br /><br />Until now, technological limitations have made it hard to detect neutrinos because they rarely interact with other forms of matter.<br /><br />The Gran Sasso lab's huge Borexino detector, located more than 0.62 miles (1 kilometer) underground, overcame the limitations and observed the low-energy neutrinos. The results confirmed the two nuclear steps that involve beryllium, showing that physicists have been on target at least about those routes to neutrinos.<br /><br />However, that</p></blockquote> <div class="Discussion_UserSignature"> </div>

 

[3488]

Yes, I take it that it is due to the sheer density of the core of the Sun that photons<br />move so slowly to start with?<br /><br />It is a weird thought the the sunlight today is about a million years old (million years to<br />escape the Sun & just over eight minutes to reach Earth afterwards).<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[derekmcd]

The photons themselves don't move slowly. They are absorbed and re-emitted a countless number of times being bounced around in such a dense medium. The photon is still moving at C. <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>

 

[3488]

Thanks derekmcd.<br /><br />Is it true that they start of as Gamma Ray Photons, but become visible photons during this phase?<br /><br />Andrew Brown. <div class="Discussion_UserSignature"> <p><font color="#000080">"I suddenly noticed an anomaly to the left of Io, just off the rim of that world. It was extremely large with respect to the overall size of Io and crescent shaped. It seemed unbelievable that something that big had not been visible before".</font> <em><strong><font color="#000000">Linda Morabito </font></strong><font color="#800000">on discovering that the Jupiter moon Io was volcanically active. Friday 9th March 1979.</font></em></p><p><font size="1" color="#000080">http://www.launchphotography.com/</font><br /><br /><font size="1" color="#000080">http://anthmartian.googlepages.com/thisislandearth</font></p><p><font size="1" color="#000080">http://web.me.com/meridianijournal</font></p> </div>

 

[weeman]

It's amazing that they can even catch these things. The average electron neutrino, traveling at C, would require a slab of lead roughly 1 lightyear thick to bring it to a halt! <br /><br /> <div class="Discussion_UserSignature"> <p> </p><p><strong><font color="#ff0000">Techies: We do it in the dark. </font></strong></p><p><font color="#0000ff"><strong>"Put your hand on a stove for a minute and it seems like an hour. Sit with that special girl for an hour and it seems like a minute. That's relativity.</strong><strong>" -Albert Einstein </strong></font></p> </div>

 

[yevaud]

That's probability for you. <div class="Discussion_UserSignature"> <p><em>Differential Diagnosis:  </em>"<strong><em>I am both amused and annoyed that you think I should be less stubborn than you are</em></strong>."<br /> </p> </div>

 

[derekmcd]

"<i>Is it true that they start of as Gamma Ray Photons, but become visible photons during this phase?</i>"<br /><br />As far as I know, this is indeed what happens. Gamma rays are produces during the fusion process in the core of the sun and they lose energy during the journey outward.<br /><br /> <div class="Discussion_UserSignature"> <div> </div><br /><div><span style="color:#0000ff" class="Apple-style-span">"If something's hard to do, then it's not worth doing." - Homer Simpson</span></div> </div>