HERA: the high-energy resolution array

Conference · Fri Nov 01 00:00:00 EST 1991 · Transactions of the American Nuclear Society; (United States)

OSTI ID:7068368

Macchiavelli, A O ^[1]

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1. Lawrence Berkeley Lab., CA (United States)

The study of the properties of nuclei with high angular momentum constitutes one of the most active areas of nuclear structure research. A principal method available for observing the behavior of such nuclei is the detection and analysis of emitted electromagnetic radiation. Cascades of gamma rays, strongly correlated in space and time, carry valuable information about the dynamics of the nuclear motion. High-resolution, multiple gamma-ray coincidences obtained from arrays of Compton-suppressed germanium detectors provide a powerful tool to study in detail the amazing and intricate properties of the nuclear structure. The high-energy-resolution array (HERA) in operation at the 88-in. cyclotron of the Lawrence Berkeley Laboratory (LBL) is a powerful device specifically designed for gamma-ray spectroscopy studies. It consists of 21 hyperpure-germanium (HPGe) detectors, each surrounded by an anti-Compton shield that combines a main bismuth germanate (BGO) detector and a NaI insert. In this configuration, the response function of the individual counters is enhanced with a peak/total ratio three time better than that of the bare germanium. The system is complemented with a central ball, which is a compact array of 40 BGO detectors covering {approximately}80% of 4{pi}. The 21 HPGe's provide the experimenters with high-quality, high-resolution gamma-ray data, together with sum energy and fold information measured by the central ball on an event-by-event basis.

• OSTI ID: 7068368
• Report Number(s): CONF-911107-; CODEN: TANSA
• Journal Information: Transactions of the American Nuclear Society; (United States), Vol. 64; Conference: 1991 Winter meeting of the American Nuclear Society (ANS) session on fundamentals of fusion reactor thermal hydraulics, San Francisco, CA (United States), 10-15 Nov 1991; ISSN 0003-018X
• Country of Publication: United States
• Language: English

Related Subjects

46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
43 PARTICLE ACCELERATORS
BERKELEY SYNCHROCYCLOTRON
GAMMA SPECTROSCOPY
GE SEMICONDUCTOR DETECTORS
PERFORMANCE
AMPLIFIERS
ANGULAR MOMENTUM
BGO DETECTORS
COINCIDENCE SPECTROMETRY
COMPTON EFFECT
DATA ACQUISITION SYSTEMS
EFFICIENCY
NAI DETECTORS
NUCLEAR INSTRUMENT MODULES
NUCLEAR STRUCTURE
NUCLEI
RESPONSE FUNCTIONS
ACCELERATORS
BASIC INTERACTIONS
COINCIDENCE METHODS
COUNTING TECHNIQUES
CYCLIC ACCELERATORS
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTRONIC EQUIPMENT
EQUIPMENT
FUNCTIONS
INTERACTIONS
MEASURING INSTRUMENTS
RADIATION DETECTORS
SCATTERING
SCINTILLATION COUNTERS
SEMICONDUCTOR DETECTORS
SOLID SCINTILLATION DETECTORS
SPECTROSCOPY
SYNCHROCYCLOTRONS
440101* - Radiation Instrumentation- General Detectors or Monitors & Radiometric Instruments
430100 - Particle Accelerators- Design
Development
& Operation