New vistas of heavy-ion reactions with the spin spectrometer
The Spin Spectrometer is a 4 pi array of 72 large sodium iodide detectors. Its purpose is to register essentially all the gamma rays associated with a nuclear reaction. The sum of the measured pulse heights gives the excitation energy of the residual nucleus after all particle emissions has occurred - the entry state. If the angular momentum carried away by each gamma ray is known, then a simple count of the number of detectors that fired gives a good estimate of the spin of the entry state - hence the name Spin Spectrometer. Highlights are given of 20 experiments of 10 different types carried out with the instrument. The first experiment was to measure the entry-state distributions in compound-nucleus evaporation reactions. Examples are given of similar data for systems where fission of the compound nucleus is important. Entry lines and nuclear shapes are shown. The gamma ray angle information can be used to determine the nuclear spin direction on an event-by-event basis. Another experiment concerns few-nucleon transfer in deformed nuclei. Some experiments were done to study the entry states associated with nonequilibrium emission of fast particles in heavy-ion reactions. Neutron and gamma decay in giant resonances were also studied. (LEW)
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
- DOE Contract Number:
- W-7405-ENG-26
- OSTI ID:
- 5480753
- Report Number(s):
- ORNL/TM-8986; ON: DE84005081
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GAMMA SPECTROMETERS
FOUR-PI COUNTING
USES
COMPOUND NUCLEI
ENERGY LEVELS
GIANT RESONANCE
HEAVY ION REACTIONS
NAI DETECTORS
SPIN
ANGULAR MOMENTUM
CHARGED-PARTICLE REACTIONS
COUNTING TECHNIQUES
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
PARTICLE PROPERTIES
RADIATION DETECTORS
RESONANCE
SCINTILLATION COUNTERS
SOLID SCINTILLATION DETECTORS
SPECTROMETERS
440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation