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HD target

HD target. Grass 2007.05.09. Although this long relaxation time is essential for the usage of polarized targets in nuclear physics experiments, it makes the polarization phase equally long. This is a dilemma;

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HD target

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  1. HD target Grass 2007.05.09

  2. Although this long relaxation time is essentialfor the usage of polarized targets in nuclear physics experiments, it makes the polarization phase equally long. This is a dilemma; • we hope to prepare the polarized target in a relatively short time and like to keep the produced polarized target for a long time in experiments. LEPS/RCNP proposal, Photoproduction Experiment with Polarized HD Target at SPring-8

  3. Walter N. Hardy and J. R. Gaines, Phys. Letters 24A, 440 (1966)

  4. Walter N. Hardy and J. R. Gaines, Phys. Letters 24A, 440 (1966)

  5. A. Honig, Phys. Rev. Lett. 19, 1009 (1967). LEPS/RCNP proposal, Photoproduction Experiment with Polarized HD Target atSPring-8

  6. the J=1 concentration as a function of time D = time constants for ortho-para conversion in H2 = 141 (h) = 507600 (s) c2 = Concentration of o-H2 = 0.003 ψ = the J=1 fraction of H2= 0.75 (taken from Constable paper (1973)) t = time J. H. Constable and J. R. Gaines, Phys. Rev. Lett. B 8, 3966 (1973)

  7. heat generated in the sample from conversion of the J=1 molecules D = time constants for ortho-para conversion in H2 = 141 (h) = 507600 (s) c2 = Concentration of o-H2 = 0.003 E =The energy difference between o-H2 and p-H2 ≈15 (meV). = 0.015 ×1.6 ×10-19 = 24 ×10-22 J ψ = the J=1 fraction of H2= 0.75 (taken from Constable paper (1973)) N = amount of H2+D2+HD=1 mol= Avogadro number = 6 × 1023 t = time J. H. Constable and J. R. Gaines, Phys. Rev. Lett. B 8, 3966 (1973)

  8. the difference is N (amount of total HD) and the c2 (concentration of o-H2) our calculation J. H. Constable and J. R. Gaines, Phys. Rev. B 8, 3966 (1973)

  9. Temperature calculation of HD target by M. M. Lowry. M M Lowry, F Lincoln, L Miceli, T Saitoh, A Sandorfi, X Wei, C Whisnant. Progress on the LEGS polarized HD target. Int'l workshop on polarized beams and polarized targets, PST 2001, Vol Sept 2001, (2001)

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