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Polarized negative ions

Description: This paper presents a survey of methods, commonly in use or under development, to produce beams of polarized negative ions for injection into accelerators. A short summary recalls how the hyperfine interaction is used to obtain nuclear polarization in beams of atoms. Atomic-beam sources for light ions are discussed. If the best presently known techniques are incorporated in all stages of the source, polarized H/sup -/ and D/sup -/ beams in excess of 10 ..mu..A can probably be achieved. Producti… more
Date: April 1, 1981
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Progress in the art of producing polarized ions

Description: A short review of the progress that has been made during the last two years in the design and construction of polarized-ion sources is given and current research efforts on new types of ion sources are summarized. The emphasis is on the production of polarized negative ions, but positive ions are mentioned because in the conventional atomic-beam source, negative ions are obtained by charge exchange of a positive polarized beam. While originally beams of polarized negative ions were developed fo… more
Date: January 1, 1980
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Parity violation in the nucleon-nucleon interaction

Description: A short review is presented of experiments designed to detect parity nonconservation (PNC) in the interaction between nucleons. A recent measurement of PNC in proton-proton scattering is described, and some of the methods which were developed to reduce systematic errors to less than or equal to 2 x 10/sup -8/ are discussed. The results of this experiment and of other measurements on PNC are compared to theoretical predictions.
Date: January 1, 1981
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Sources of polarized negative ions: progress and prospects

Description: A summary of recent progress in the art of producing beams of polarized ions is given. In all sources of polarized ions, one first produces (or selects) neutral atoms which are polarized in electron spin. Those types of sources which use a beam of thermal polarized hydrogen atoms are discussed. Progress made in the preparation of the atomic beam and the methods used to convert the neutral atoms to polarized ions is summarized. The second type of source discussed is based on fast (keV) polarized… more
Date: January 1, 1980
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Determination of the asymptotic ratio of the deuteron D- and S-state amplitudes. [7 to 9 MeV]

Description: The value 0.02649 +- 0.00043 is deduced for the deuteron asymptotic D- to S-state ratio from measurements of the /sup 208/Pb(d,p)/sup 209/Pb tensor analyzing powers at sub-Coulomb bombarding energies E/sub d/ = 7, 8, and 9 MeV. The quoted uncertainty includes statistical errors, beam polarization measurement errors, and systematic errors that result from a choice of optical model parameters used to describe the reaction. The result is compared to several theoretical deutron wave functions. 2 fi… more
Date: unknown
Creator: Stephenson, K. & Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Development of a hydrogen and deuterium polarized gas target for application in storage rings

Description: Polarized gas targets of atomic hydrogen and deuterium have significant advantages over conventional polarized targets, e.g. chemical and isotopic purity, large polarization including deuteron tensor polarization, absence of strong magnetic fields, rapid polarization reversal. While in principle the beam of polarized atoms from an atomic beam source (Stern-Gerlach spin separation) can be used as a polarized target, the target thickness achieved is too small for most applications. We propose to … more
Date: February 1, 1992
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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[Development of a hydrogen and deuterium polarized gas target for application in storage rings]

Description: Progress has been made on the two major components of the project, the tests of storage cells for polarized atoms under various operating conditions, and the construction of a new atomic beam source which conforms to the high vacuum requirements of storage rings.
Date: January 1, 1993
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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[Development of a hydrogen and deuterium polarized gas target for application in storage rings]. Progress report

Description: Progress has been made on the two major components of the project, the tests of storage cells for polarized atoms under various operating conditions, and the construction of a new atomic beam source which conforms to the high vacuum requirements of storage rings.
Date: March 1, 1993
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Development of a hydrogen and deuterium polarized gas target for application in storage rings. Progress report

Description: Polarized gas targets of atomic hydrogen and deuterium have significant advantages over conventional polarized targets, e.g. chemical and isotopic purity, large polarization including deuteron tensor polarization, absence of strong magnetic fields, rapid polarization reversal. While in principle the beam of polarized atoms from an atomic beam source (Stern-Gerlach spin separation) can be used as a polarized target, the target thickness achieved is too small for most applications. We propose to … more
Date: February 1, 1992
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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POLARIZATION OF Li$sup 7$(p,n)Be$sup 7$ NEUTRONS

Description: The polarization of neutrons emitted from the Li/sup 7/(p,n)Be/sup 7/ reaction at an angle of 50 deg was measured for neutron energies between 0.7 and 1.5 Mev. The polarization was deduced from the right-left asymmetry in the scattering of these neutrons from liquid oxygen. The results indicate that the polarization is close to --0.3, independent of hombarding energy. One measurement for neutrons emitted at 30 deg yields a polarization only slightly smaller than for neutrons emitted at 50 deg f… more
Date: January 1, 1957
Creator: Striebel, H.R.; Darden, S.E. & Haeberli, W.
Partner: UNT Libraries Government Documents Department
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Development of a hydrogen and deuterium polarized gas target for application in storage rings

Description: The present report contains the progress report for the second year of the 3-year budget period, and proposes work for the third year. Progress has been made on the two major components of the project, the tests of storage cells for polarized atoms under various operating conditions, and the construction of a new atomic beam source which conforms to the high vacuum requirements of storage rings.
Date: January 1, 1991
Creator: Haeberli, W.
Partner: UNT Libraries Government Documents Department
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POLARIZATION OF NEUTRONS SCATTERED BY INTERMEDIATE AND HEAVY NUCLEI

Description: Measurements of the polarization produced in the scattering of neutrons from heavy nuclei have been carried out at neutron energies of 380 and 980 kev. The Li/sup 7/(p,n)Be/sup 7/ reaction was used as a source of polarized neutrons. Right-left asymmetries in scattering of these neutrons from several elements ranging in atomic weight from 55 to 238 were measured at scattering angles of 55, 90, and 130 deg . With few exceptions the observed polarizations vary smoothly with atomic weight. Measured… more
Date: January 1, 1957
Creator: Clement, J.D.; Boreli, F.; Darden, S.E.; Haeberli, W. & Striebel, H.R.
Partner: UNT Libraries Government Documents Department
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Run05 Proton Beam Polarization Measurements by pC-Polarimeter (ver. 1.1)

Description: The polarization of the proton beams [1, 2] at the Relativistic Heavy Ion Collider (RHIC)[3] RHIC ring. The H-Jet polarimeter is located at the collision point allowing measurements of absolute normalization is provided by the hydrogen polarimeter, which measures over 1 {approx} 2 another measurement rather than measuring the absolute polarization. both beams. Two identical pC-polarimeters are equipped in the yellow and blue rings, where carbon ribbon target, providing fast feedback to beam ope… more
Date: July 1, 2008
Creator: Nakagawa,I.; Alekseev, I.; Bazilevsky, A.; Bravar, A.; Bunce, G.; Dhawan, S. et al.
Partner: UNT Libraries Government Documents Department
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