A low background telescopic system for the study of (n,α) reactions

doi:10.1016/0029-554X(70)90012-1

Nuclear Instruments and Methods

Volume 79, Issue 1, 1 March 1970, Pages 77-81

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Abstract

The time-of-flight technique involving the associated alpha particles from the 14 MeV neutron producing T(d,n)⁴He reaction has been used to minimize the background of a telescopic system consisting of two hydrogen filled proportional counters and a silicon detector. This technique has been employed for the study of the ¹⁶O(n,α)¹³C reaction which has a Q value of −2.2 MeV. The energy spectra obtained and the angular distribution are in good agreement with recent measurements of Bissem et al., who used a CsI(Tl) detector. The silicon counter background is appreciably reduced by this technique, which can be conveniently utilized for the study of negative Q value (n,α) reactions having differential cross sections down to about 1 mb/sr.

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Cited by (2)

A low background detection system for neutron reaction experiments
1977, Nuclear Instruments and Methods
A low background detection system has been developed for (n, charged particle) experiments with 14 MeV neutrons. A telescope having two gas proportional ΔE-counters and a NaI(Tl) E-detector is used, along with a fast scintillation counter for the associated alpha particles from the T(d,n)⁴He neutron source. The charged particle time-of-flight t is measured as well as ΔE₁, ΔE₂, and E. Particle identification is effected by combining the ΔE and E signals in differential range analog circuit, and background suppression is accomplished by recording only those events for which t is in a predetermined range Δt. The telescope differs significantly from previous designs in having an E-detector of large area at the end of an evacuated drift tube, to provide good geometrical efficiency and time dispersion without excessive energy loss along the flight path. Optimum energy resolution is obtained by using a light filter to compensate for non-uniform phototube response. The time-of-flight gating technique reduces the data collection time required for a cross section measurement of any given statistical accuracy.
The (n,α) reactions on11B,14N and16O with 14 MeV neutrons
1973, Zeitschrift für Physik

^∗: On leave of absence from the Saha Institute of Nuclear Physics, Calcutta.

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Nuclear Instruments and Methods

Abstract

References (7)

Nucl. Instr. and Meth.

Nucl. Phys.

Nucl. Phys.

Cited by (2)

A low background detection system for neutron reaction experiments

The (n,α) reactions on<sup>11</sup>B,<sup>14</sup>N and<sup>16</sup>O with 14 MeV neutrons