POLARIZED NEUTRONS IN RHIC

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There does not appear to be any obvious way to accelerate neutrons, polarized or otherwise, to high energies by themselves. To investigate the behavior of polarized neutrons the authors therefore have to obtain them by accelerating them as components of heavier nuclei, and then sorting out the contribution of the neutrons in the analysis of the reactions produced by the heavy ion beams. The best neutron carriers for this purpose are probably {sup 3}He nuclei and deuterons. A polarized deuteron is primarily a combination of a proton and a neutron with their spins pointing in the same direction; in the ... continued below

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6 pages

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COURANT,E.D. April 27, 1998.

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There does not appear to be any obvious way to accelerate neutrons, polarized or otherwise, to high energies by themselves. To investigate the behavior of polarized neutrons the authors therefore have to obtain them by accelerating them as components of heavier nuclei, and then sorting out the contribution of the neutrons in the analysis of the reactions produced by the heavy ion beams. The best neutron carriers for this purpose are probably {sup 3}He nuclei and deuterons. A polarized deuteron is primarily a combination of a proton and a neutron with their spins pointing in the same direction; in the {sup 3}He nucleus the spins of the two protons are opposite and the net spin (and magnetic moment) is almost the same as that of a free neutron. Polarized ions other than protons may be accelerated, stored and collided in a ring such as RHIC provided the techniques proposed for polarized proton operation can be adapted (or replaced by other strategies) for these ions. To accelerate polarized particles in a ring, one must make provisions for overcoming the depolarizing resonances that occur at certain energies. These resonances arise when the spin tune (ratio of spin precession frequency to orbit frequency) resonates with a component present in the horizontal field. The horizontal field oscillates with the vertical motion of the particles (due to vertical focusing); its frequency spectrum is dominated by the vertical oscillation frequency and its modulation by the periodic structure of the accelerator ring. In addition, the magnet imperfections that distort the closed orbit vertically contain all integral Fourier harmonics of the orbit frequency.

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6 pages

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INIS; OSTI as DE00757111

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  • RIKEN-BNL WORKSHOP ON RHIC SPIN PHYSICS, UPTON, NY (US), 04/27/1998--04/29/1998

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  • Report No.: BNL--65606
  • Report No.: KB0202
  • Grant Number: AC02-98CH10886
  • Office of Scientific & Technical Information Report Number: 757111
  • Archival Resource Key: ark:/67531/metadc704343

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • April 27, 1998

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  • Sept. 12, 2015, 6:31 a.m.

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  • Nov. 9, 2015, 8:41 p.m.

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COURANT,E.D. POLARIZED NEUTRONS IN RHIC, article, April 27, 1998; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc704343/: accessed April 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.