<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><div><br></div><div>Which dilution factor should we use for LiD: 2/8 or 4/8 ?</div><br><div>
<div style="color: rgb(0, 0, 0); font-family: Optima; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Patricia<br><br>-- <br>Patricia SOLVIGNON<br>Staff Scientist<br>Jefferson Lab<br><br>Current address : <br>Jefferson Lab<br>Suite 6, MS. 12H4 Room C121 (Cebaf Center)<br>12000 Jefferson Avenue Office: (757)-269-6933<br>Newport News, VA 23606</div>
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<br><div><div>On May 2, 2013, at 2:37 PM, O. A. Rondon <<a href="mailto:or@virginia.edu">or@virginia.edu</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite">Hi Karl,<br><br>- This is what I think about the target physics of LiD.<br><br>The main issues with LiD are that the polarization takes a long time to<br>ramp up, longer than ND3 and therefore it takes "forever" to thermalize.<br>Not a problem if the ratio method is used.<br><br>Also, the maximum Pz ~ 30-35%, is lower, but no anneals are needed.<br>Basically the maximum Pz is the average Pz.<br><br>LiD could be a good material for a 6.5 T solenoid target. At Pz = 71%<br>has been achieved at 0.25 K. Given its superb radiation resistance, I<br>would expect it to beat ND3 at 1 K and 100 nA.<br><br>The SLAC LiD experience is reported here. The conclusions section says<br>it all.<br><a href="http://dx.doi.org/10.1016/S0168-9002(98)01341-2">http://dx.doi.org/10.1016/S0168-9002(98)01341-2</a><br><br>- This is what I said about the nuclear properties<br><br>O. A. Rondon wrote:<br><blockquote type="cite"><br>Things are a bit trickier for LiD, since the alpha cluster in Li would<br>contribute to the denominator, but not to the numerator, and the<br>effective polarization of the D cluster in Li is not the 6Li<br>polarization. So an analysis like that of my E155 tech note (posted at<br>the URL shown below,) suitably modified to take into account that the<br>beam polarization is not involved, is needed<br><br></blockquote>http://twist.phys.virginia.edu/%7Eor/lidnucl.pdf<br><blockquote type="cite"><br>Also, we need to keep in mind that LiD has > 4% 7Li and 2% H, both of<br>which polarize very high (>~70%) and with the very large proton<br>asymmetry could complicate things significantly, so using LiD would need<br>detailed study.<br></blockquote><br>Cheers,<br><br>Oscar<br><br><br>Karl Slifer wrote:<br><blockquote type="cite">I thought that it got absorbed into eg1-dvcs?<br><br>---<br>Karl J. Slifer<br>Assistant Professor<br>University of New Hampshire<br>Telephone : 603-722-0695<br><br><br>On Thu, May 2, 2013 at 1:57 PM, <narbe@jlab.org> wrote:<br><br><blockquote type="cite">Hi Karl,<br><br>If you're referring to the g1d experiment, that unfortunately got killed<br>back in 2009.<br><br>Narbe<br><br><br><blockquote type="cite">Hi all,<br><br>LiD has better dilution factor and prob better polarization, but we<br>decided<br>to not use it for last PAC. Can someone remind me why we backed away<br></blockquote>from<br><blockquote type="cite">using it? I guess it was the ambiguity of how to treat the Li (=He+D),<br>but<br>in the mean time, I think Peter ran an experiment comparing LiD to ND3,<br></blockquote>so<br><blockquote type="cite">we'd be on firmer ground now.<br><br>Oscar, I think you looked closely at this. Can we use LiD?<br><br>-Karl<br>_______________________________________________<br>b1_ana mailing list<br>b1_ana@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/b1_ana<br><br></blockquote><br><br></blockquote><br><br>------------------------------------------------------------------------<br><br>_______________________________________________<br>b1_ana mailing list<br>b1_ana@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/b1_ana<br></blockquote><br><br><br><br>_______________________________________________<br>b1_ana mailing list<br>b1_ana@jlab.org<br>https://mailman.jlab.org/mailman/listinfo/b1_ana<br></blockquote></div><br></body></html>