Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 189-210 |
| Seitenumfang | 22 |
| Fachzeitschrift | Zeitschrift für Physik |
| Jahrgang | 262 |
| Ausgabenummer | 3 |
| Publikationsstatus | Veröffentlicht - Juni 1973 |
| Extern publiziert | Ja |
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.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Kern- und Hochenergiephysik
- Physik und Astronomie (insg.)
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in: Zeitschrift für Physik, Jahrgang 262, Nr. 3, 06.1973, S. 189-210.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
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
Y1 - 1973/6
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.
UR - http://www.scopus.com/inward/record.url?scp=34250430448&partnerID=8YFLogxK
U2 - 10.1007/BF01391836
DO - 10.1007/BF01391836
M3 - Article
AN - SCOPUS:34250430448
VL - 262
SP - 189
EP - 210
JO - Zeitschrift für Physik
JF - Zeitschrift für Physik
SN - 1434-6001
IS - 3
ER -