Relaxation and deorientation of110Ag(T1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

  • J. Mertens
  • H. Ackermann
  • D. Dubbers
  • P. Heitjans
  • A. Winnacker
  • P. von Blanckenhagen

Externe Organisationen

  • Ruprecht-Karls-Universität Heidelberg
  • Karlsruher Institut für Technologie (KIT)
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Details

OriginalspracheEnglisch
Seiten (von - bis)189-210
Seitenumfang22
FachzeitschriftZeitschrift für Physik
Jahrgang262
Ausgabenummer3
PublikationsstatusVeröffentlicht - Juni 1973
Extern publiziertJa

Abstract

Polarized110Ag nuclei are produced in the silver halides by capture of polarized neutrons at temperatures below 30 K and magnetic field strengths up to 6 kOe. The depolarization process is studied by observation of the β decay asymmetry as a function of magnetic field, temperature and of the radio frequency field strength in NMR signals. The depolarization is caused by a field dependent deorientation process and by temperature dependent spin-lattice relaxation. The deorientation is due to a succession of coupling steps of the nuclear spin with electromagnetic fields of defects generated as a consequence of the capture process, and the field dependence of the polarization can be understood as a decoupling curve. The temperature dependence of the spin-lattice relaxation is in accordance with the theory of quadrupolar relaxation above 18 K if an empirical phonon spectrum is used for the calculation. At lower temperatures the experimental relaxation rate is anomalously high, which may be due to resonance modes connected with recoil lattice defects.

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Relaxation and deorientation of110Ag(T1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides. / Mertens, J.; Ackermann, H.; Dubbers, D. et al.
in: Zeitschrift für Physik, Jahrgang 262, Nr. 3, 06.1973, S. 189-210.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Mertens J, Ackermann H, Dubbers D, Heitjans P, Winnacker A, von Blanckenhagen P. Relaxation and deorientation of110Ag(T1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides. Zeitschrift für Physik. 1973 Jun;262(3):189-210. doi: 10.1007/BF01391836
Mertens, J. ; Ackermann, H. ; Dubbers, D. et al. / Relaxation and deorientation of110Ag(T1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides. in: Zeitschrift für Physik. 1973 ; Jahrgang 262, Nr. 3. S. 189-210.
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abstract = "Polarized110Ag nuclei are produced in the silver halides by capture of polarized neutrons at temperatures below 30 K and magnetic field strengths up to 6 kOe. The depolarization process is studied by observation of the β decay asymmetry as a function of magnetic field, temperature and of the radio frequency field strength in NMR signals. The depolarization is caused by a field dependent deorientation process and by temperature dependent spin-lattice relaxation. The deorientation is due to a succession of coupling steps of the nuclear spin with electromagnetic fields of defects generated as a consequence of the capture process, and the field dependence of the polarization can be understood as a decoupling curve. The temperature dependence of the spin-lattice relaxation is in accordance with the theory of quadrupolar relaxation above 18 K if an empirical phonon spectrum is used for the calculation. At lower temperatures the experimental relaxation rate is anomalously high, which may be due to resonance modes connected with recoil lattice defects.",
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Download

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T1 - Relaxation and deorientation of110Ag(T1/2=24.4s) nuclei produced by capture of polarized neutrons in the silver halides

AU - Mertens, J.

AU - Ackermann, H.

AU - Dubbers, D.

AU - Heitjans, P.

AU - Winnacker, A.

AU - von Blanckenhagen, P.

PY - 1973/6

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N2 - Polarized110Ag nuclei are produced in the silver halides by capture of polarized neutrons at temperatures below 30 K and magnetic field strengths up to 6 kOe. The depolarization process is studied by observation of the β decay asymmetry as a function of magnetic field, temperature and of the radio frequency field strength in NMR signals. The depolarization is caused by a field dependent deorientation process and by temperature dependent spin-lattice relaxation. The deorientation is due to a succession of coupling steps of the nuclear spin with electromagnetic fields of defects generated as a consequence of the capture process, and the field dependence of the polarization can be understood as a decoupling curve. The temperature dependence of the spin-lattice relaxation is in accordance with the theory of quadrupolar relaxation above 18 K if an empirical phonon spectrum is used for the calculation. At lower temperatures the experimental relaxation rate is anomalously high, which may be due to resonance modes connected with recoil lattice defects.

AB - Polarized110Ag nuclei are produced in the silver halides by capture of polarized neutrons at temperatures below 30 K and magnetic field strengths up to 6 kOe. The depolarization process is studied by observation of the β decay asymmetry as a function of magnetic field, temperature and of the radio frequency field strength in NMR signals. The depolarization is caused by a field dependent deorientation process and by temperature dependent spin-lattice relaxation. The deorientation is due to a succession of coupling steps of the nuclear spin with electromagnetic fields of defects generated as a consequence of the capture process, and the field dependence of the polarization can be understood as a decoupling curve. The temperature dependence of the spin-lattice relaxation is in accordance with the theory of quadrupolar relaxation above 18 K if an empirical phonon spectrum is used for the calculation. At lower temperatures the experimental relaxation rate is anomalously high, which may be due to resonance modes connected with recoil lattice defects.

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