[G14_run] P(H) in g14

[Andy Sandorfi]

Hi Alessandra,

Nice slides. I'm sure your presentation went well.
As to the question of why the polarization was "so low": you talked about reactions on a proton target. The original focus of g14 was reactions on polarized neutrons, in deuterium. The HD is produced with about 60% H polarization, together with a small D polarization (about 10 - 15%, depending on the gas purity). We then used an RF transition to increase the D polarization by transferring spin from H to D. H is spin 1/2 and D is spin 1, so roughly one needs to lose 40% P(H) to gain 20% P(D). So by the time data taking started, P(H) had dropped a lot.

Andy




On 9/16/22, 10:25 AM, "G14_run on behalf of alessandra filippi" <g14_run-bounces at jlab.org on behalf of filippi at to.infn.it> wrote:

    Yes sure, the angle is the same for all.
    You need to change the signs of all spins, though, if the angle is negative, which means that the signs of Pz and Pzdot are reversed for negative angles, and this makes Pz odd by construction. This is consistent with a paper by A2 (I will pass it over to you shortly).
    No reaction from the audience (all more asleep than myself), Dan Watts was happy with it. 
    I was only asked by Hartmut Schmieden why our target polarization, even in our better case, is so low… which answer, honestly, I invented :-)
    Which is the real reason?
    Hear from you soon 
           Alessandra 
    
    
    
    
    
    > On 16 Sep 2022, at 15:16, Annalisa D'Angelo <annalisa.dangelo at roma2.infn.it> wrote:
    > 
    > Dera Alessandra,
    > 
    > your slides are very well done!
    > 
    > Just a question:
    > 
    > - the updated definition of the phi_el angle that is used for the P_z asymmetry is the same used for I_dot and P_z_dot, also?
    > 
    > In bocca al lupo!
    > 
    > Annalisa
    > 
    > Il 15/09/22 14:54, filippi at to.infn.it ha scritto:
    >> Dear all,
    >> at this link you can find a draft of my presentation for tomorrow at the
    >> STRONG2020 spectroscopy workshop:
    >> 
    >> https://urldefense.proofpoint.com/v2/url?u=https-3A__drive.google.com_file_d_1NfBM6xpwktXnL8cO3XZnG8C5992-5FYCp5_view-3Fusp-3Dsharing&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=5LSWsFN5KweowPCsdwCuT6TNyYmHKJ3RcKK8qa-oO-g&m=pZdYYSwyDCNlCv0QcwUSTaJyuxBkoy5HATxnWuNq114PnZ_B3Lg56L6Fn-LxmjMD&s=TIcDFb06AuSaUT-WtChxwHjbcaGAAooUZaiC5qj3lGU&e=  
    >> 
    >> I still have to decide what to show, depending on the time I will take to
    >> tell the story (I have 20 minutes), I still have to rehearse myself.
    >> Please let me know your feedback at your earliest convenience, taking into
    >> account that my internet connection from this place in Germany is limited
    >> and possible during the conference sessions (i.e., no connection at the
    >> hotel in the evening).
    >> Thanks, cheers
    >>      Alessandra
    >> 
    >> 
    >> 
    >> 
    >>> Dear All,
    >>> 
    >>> this is a reminder of tomorrow g14 meeting at 9:00 am JLab time.
    >>> 
    >>> The link to the Zoom meeting is the following:
    >>> 
    >>> https://urldefense.proofpoint.com/v2/url?u=https-3A__jlab-2Dorg.zoomgov.com_j_1608547947-3Fpwd-3DM1ZRc3k1dTlWek1Tb1o3V25uWlN1Zz09&d=DwIFaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=5LSWsFN5KweowPCsdwCuT6TNyYmHKJ3RcKK8qa-oO-g&m=Cg7srkKzLzm_dRqy4Ar3kXS52wi9tpe9lPtwSF86yNADsdDwshFZdkWX9ZUTqqPA&s=bQdK8UE2E0EylLfQPzGI1KHOBssKLqlF-2ERMDYtT44&e=
    >>> 
    >>> meeting id is
    >>> 
    >>> 160 854 7947
    >>> 
    >>> if required passcode is
    >>> 
    >>> 396000.
    >>> 
    >>> All the best
    >>> Annalisa
    >>> 
    >>> Prof.ssa Annalisa D'Angelo
    >>> Dip Fisica Università di Roma Tor Vergata e INFN Roma Tor Vergata
    >>> Jefferson Lab
    >>> 
    >>> _______________________________________________
    >>> G14_run mailing list
    >>> G14_run at jlab.org
    >>> https://mailman.jlab.org/mailman/listinfo/g14_run
    >>> 
    >> 
    >> 
    > -- 
    > ================================================
    > Prof. Annalisa D'Angelo
    > Dip. Fisica, Universita' di Roma "Tor Vergata"
    > Istituto Nazionale di Fisica Nucleare
    > Sezione di Roma Tor Vergata, Rome Italy
    > email:annalisa.dangelo at roma2.infn.it
    > Jefferson Laboratory, Newport News, VA USA
    > Email: annalisa at jlab.org
    > Tel: + 39 06 72594562
    > 
    
    
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