[b1_ana] LiD

[Patricia SOLVIGNON]

Which dilution factor should we use for LiD: 2/8 or 4/8 ?

Patricia

-- 
Patricia SOLVIGNON
Staff Scientist
Jefferson Lab

Current address : 
Jefferson Lab
Suite 6, MS. 12H4                               Room C121 (Cebaf Center)
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Newport News, VA 23606

On May 2, 2013, at 2:37 PM, O. A. Rondon <or at virginia.edu> wrote:

> Hi Karl,
> 
> - This is what I think about the target physics of LiD.
> 
> The main issues with LiD are that the polarization takes a long time to
> ramp up, longer than ND3 and therefore it takes "forever" to thermalize.
> Not a problem if the ratio method is used.
> 
> Also, the maximum Pz ~ 30-35%, is lower, but no anneals are needed.
> Basically the maximum Pz is the average Pz.
> 
> LiD could be a good material for a 6.5 T solenoid target. At Pz = 71%
> has been achieved at 0.25 K. Given its superb radiation resistance, I
> would expect it to beat ND3 at 1 K and 100 nA.
> 
> The SLAC LiD experience is reported here. The conclusions section says
> it all.
> http://dx.doi.org/10.1016/S0168-9002(98)01341-2
> 
> - This is what I said about the nuclear properties
> 
> O. A. Rondon wrote:
>> 
>> Things are a bit trickier for LiD, since the alpha cluster in Li would
>> contribute to the denominator, but not to the numerator, and the
>> effective polarization of the D cluster in Li is not the 6Li
>> polarization. So an analysis like that of my E155 tech note (posted at
>> the URL shown below,) suitably modified to take into account that the
>> beam polarization is not involved, is needed
>> 
> http://twist.phys.virginia.edu/%7Eor/lidnucl.pdf
>> 
>> Also, we need to keep in mind that LiD has > 4% 7Li and 2% H, both of
>> which polarize very high (>~70%) and with the very large proton
>> asymmetry could complicate things significantly, so using LiD would need
>> detailed study.
> 
> Cheers,
> 
> Oscar
> 
> 
> Karl Slifer wrote:
>> I thought that it got absorbed into eg1-dvcs?
>> 
>> ---
>> Karl J. Slifer
>> Assistant Professor
>> University of New Hampshire
>> Telephone : 603-722-0695
>> 
>> 
>> On Thu, May 2, 2013 at 1:57 PM, <narbe at jlab.org> wrote:
>> 
>>> Hi Karl,
>>> 
>>> If you're referring to the g1d experiment, that unfortunately got killed
>>> back in 2009.
>>> 
>>> Narbe
>>> 
>>> 
>>>> Hi all,
>>>> 
>>>> LiD has better dilution factor and prob better polarization, but we
>>>> decided
>>>> to not use it for last PAC.  Can someone remind me why we backed away
>>> from
>>>> using it?  I guess it was the ambiguity of how to treat the Li (=He+D),
>>>> but
>>>> in the mean time, I think Peter ran an experiment comparing LiD to ND3,
>>> so
>>>> we'd be on firmer ground now.
>>>> 
>>>> Oscar, I think you looked closely at this. Can we use LiD?
>>>> 
>>>> -Karl
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>>> 
>>> 
>> 
>> 
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> 
> 
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