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Title: PHYSICAL COMPARISON OF GAMMA CAMERA AND TWO-HEADED SCANNER: FIGURES OF MERIT AND TIMES REQUIRED FOR THRESHOLD DETECTION OF SPHERICAL SOURCES.

Journal Article · · Brit. J. Radiol., 41: 586-96(Aug. 1968).
; ;

Research Organization:
Hammersmith Hospital, London
Sponsoring Organization:
USDOE
NSA Number:
NSA-22-049418
OSTI ID:
4485977
Journal Information:
Brit. J. Radiol., 41: 586-96(Aug. 1968)., Other Information: Orig. Receipt Date: 31-DEC-68
Country of Publication:
Country unknown/Code not available
Language:
English

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Most theoretical approaches used in nuclear astrophysics to model the nucleosynthesis of heavy elements incorporate the so-called statistical model in order to describe the excitation and decay properties of atomic nuclei. One of the basic assumptions of this model is the validity of the Brink–Axel hypothesis and the related concept of so-called photon strength functions to describe γ-ray transition probabilities. We present a novel experimental approach that allows for the first time to experimentally determine the photon strength function simultaneously in two independent ways by a unique combination of quasi-monochromatic photon beams and a newly implemented γ–γ coincidence setup. This technique does not assume a priori the validity of the Brink–Axel hypothesis and sets a benchmark in terms of the detection sensitivity for measuring decay properties of photo-excited states below the neutron separation energy. The data for the spherical off-shell nucleus 128Te were obtained for γ-ray beam-energy settings between 3 MeV and 9 MeV in steps of 130 keV for the lower beam energies and in steps of up to 280 keV for the highest beam settings. We present a quantitative analysis on the consistency of the derived photon strength function with the Brink–Axel hypothesis. The data clearly demonstrate a discrepancy of up to a factor of two between the photon strength functions extracted from the photoabsorption and photon emission process, respectively. In addition, we observe that the photon strength functions are not independent of the excitation energy, as usually assumed. Thus, we conclude, that the Brink–Axel hypothesis is not strictly fulfilled in the excitation-energy region below the neutron separation threshold (Sn = 8.78 MeV) for the studied case of 128Te.
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Related Subjects

N28530* -Life Sciences-Medicine-Radiodiagnosis
CAMERAS
CANCER
DIAGNOSIS
GAMMA DETECTION
GAMMA RADIATION
IODINE 131
MAN
MEDICINE
MOCKUP
PHANTOMS
RADIATION DETECTORS
SCINTILLATION COUNTERS
SOLUTIONS
SPHERES
TECHNETIUM 99
TESTING
TIME
TRACER TECHNIQUES
TUMORS
USES
WATER
DISEASES
NEOPLASTIC/tumors
radiodiagnosis
comparison of gamma cameras and scintillation scanners for
GAMMA CAMERAS/ efficiency for radioisotope scanning
comparison of
with scintillation scanner
PHANTOMS/development for comparison of gamma cameras and scintillation scanners for radioisotope scanning
RADIOISOTOPE SCANNING/performance of gamma cameras and scintillation scanners for
physical comparison of
RADIATION DETECTORS
SCINTILLATION/performance of collimated two-headed
for radioisotope scanning
comparison of
with gamma cameras