A FAST NEUTRON TIME-OF-FLIGHT SPECTROMETER

Journal Article · Wed Jan 01 04:00:00 EST 1958 · Periodica Polytech. (Elec. Eng.)

OSTI ID:4204950

Hrehuss, G; Neszmelyi, A; Simonyi, K

A description of a procedure and an experimental setup for the measurement of neutron spectra at 0.8 to 14 Mev is given. The spectrometer is intended for the measurement of spectra of inelastic scattering of (DD) and (DT) neutrons by various nuclei. The experimental arrangement is similar essentially to that employed by Cranberg and Levin (Referat. Zhur. Fiz., 1957, No. 4, 8792). Brief neutron pulses (2 to 3 millimicrons-seconds) were obtained by deflecting the deuteron beam, incident on the diaphragm, by means of a high frequency electric field. Deuterons with energies of 200 kv, were obtained with a CockcroftWalton generator. The pulsating current of the deuterons incident on the target amounted to approximately 1 microampere. With such a current, the yield of (DD) and (DT) neutrons amounted to lO/sup 6/ and 10/sup 7/ neutrons per second, respectively. The neutrons were detected with a scintillation counter. The measurement of the time-of-flight were made with a single-channel system, which registered the coincidences between the pulses corresponding to the deuteron pulses, shifted by a suitable phase, and the pulses from the scintillation counter. The resolving time off the coincidence circuit is 3 x 10/ sup -9/ sec. The phase shift was realized by means of a broadband scheme, that insured phase variation from 0 to 360 deg . The coincidence-counting rate was measured as a function of the phase shift (time delay). To exclude registration of coincidences due to neutrons arising in the preceding deuteron pulse, the output was passed from the coincidence circuit through a system of gates, the control of which was by means of the pulse from the last dynode of the photomultiplier. The pulse was amplified and after amplitude discrimination it was applied to the circuit. To check the operation of the spectrometer, the 14 Mev line of (DT) neutrons was plotted.

• Research Organization: Polytechnic Univ., Budapest
• NSA Number: NSA-13-022331
• OSTI ID: 4204950
• Journal Information: Periodica Polytech. (Elec. Eng.), Journal Name: Periodica Polytech. (Elec. Eng.) Vol. Vol: 2
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

COCKCROFT-WALTON ACCELERATORS
COINCIDENCE METHODS
CURRENTS
DEUTERIUM
DEUTERON BEAMS
EFFICIENCY
ELECTRIC FIELDS
ELECTRONIC EQUIPMENT
ENERGY
FAST NEUTRONS
FREQUENCY
INSTRUMENTS
MEASURED VALUES
NEUTRON DETECTION
NEUTRON SPECTROMETERS
NUCLEI
OPERATION
PULSES
RESOLUTION
SCATTERING
SCINTILLATION COUNTERS
SPECTRA
TARGETS
TRITIUM
VELOCITY