<i>Fast Neutron Physics: Part 1, Techniques</i>

Marion, Jerry B.; Fowler, J.L.; Marshak, R. E.; Barschall, H. H.

doi:10.1063/1.3057071

Cited by 19 publications

(51 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In this case our energy resolution is worse than at Geel [3] with a flight path of 388 m. This difference in energy resolution makes a problem to compare present data with Rohr et al [3] because of "hardening" effect Ref. [8] in case of narrow resonances measurement. An example of the hardening effect can be seen from Fig.…”

Section: Total Neutron Cross Section For 27 Al and 181 Tacontrasting

confidence: 41%

Total neutron cross section for¹⁸¹Ta

Matić

Beyer

Birgersson

et al. 2010

EPJ Web of Conferences

View full text Add to dashboard Cite

Abstract. The neutron time of flight facility nELBE, produces fast neutrons in the energy range from 0.1 MeV to 10 MeV by impinging a pulsed relativistic electron beam on a liquid lead circuit [1]. The short beam pulses (∼10 ps) and a small radiator volume give an energy resolution better than 1% at 1 MeV using a short flight path of about 6 m, for neutron TOF measurements. The present neutron source provides 2 · 10 4 n/cm 2 s at the target position using an electron charge of 77 pC and 100 kHz pulse repetition rate. This neutron intensity enables to measure neutron total cross section with a 2%-5% statistical uncertainty within a few days. In February 2008, neutron radiator, plastic detector [2] and data acquisition system were tested by measurements of the neutron total cross section for 181 Ta and 27 Al. Measurement of 181 Ta was chosen because lack of high quality data in an anergy region below 700 keV. The total neutron cross -section for 27 Al was measured as a control target, since there exists data for 27 Al with high resolution and low statistical error [3].

show abstract

Section: Total Neutron Cross Section For 27 Al and 181 Tacontrasting

confidence: 41%

Total neutron cross section for¹⁸¹Ta

Matić

Beyer

Birgersson

et al. 2010

EPJ Web of Conferences

View full text Add to dashboard Cite

show abstract

“…The acceleratorproduced neutron fluxes were checked against the calibrated neutron sources with a standard long counter [Hanson and McKibben, 1947]. The associated particle technique was also used to measure the neutron flux from the d, t reaction [Marian and Fowler, 1960]. The neutron flux produced at the target in the Van de Graaff accelerator room was viewed through a hole so located in the room shielding that the effects of neutron scattering were minimized.…”

Section: Calibration Of the Neutron I)etectormentioning

confidence: 99%

Cosmic-ray neutron flux measurements above the atmosphere

Lockwood¹,

Friling²

1968

J. Geophys. Res.

View full text Add to dashboard Cite

Measurements have been made of the neutron intensities above the atmosphere at rocket altitudes with a moderated He³ neutron detector. The He³ proportional counter was encased in a polyethylene moderator, and the moderator and neutron detector were surrounded by a ring of charged particle counters to discriminate against neutrons produced in the detector assembly by galactic and solar cosmic rays. Flights were made from 1965–1967 at 0°, 20°, 50°, and 70° geomagnetic latitudes (λ). The neutron counting rates at these latitudes are 0.3, <0.7, 1.7, and 3.0 sec−1, respectively. These counting rates can be converted to a neutron leakage flux in the energy range 10 to 5 × 106 ev by using the neutron detector calibration curve and Lingenfelter's calculated neutron energy spectrums at different latitudes. The neutron leakage flux is 0.08 ± 0.02 and 0.80 ± 0.10 neutrons/cm² sec at λ = 0° and λ = 70°, respectively. This latitude effect is about 10/1, less than the 13/1 ratio calculated by Lingenfelter in 1963. For λ < 50°, the measured and the calculated neutron fluxes agree.

show abstract

“…plastic scintillator viewed by two RCA 6810 photomultiplier tubes through Lucite light pipes. Coincidences between the two phototubes provided the "start" signal for a time to pulse-height converter of the Oak Ridge type (Marion and Fowler 1960). The stop signal was obtained from the deflection plate oscillator.…”

Section: Methodsmentioning

confidence: 99%

The Angular Distribution of 1·79 MeV Neutrons Scattered from Helium

Young¹,

Ohlsen²,

Okhuysen³

1963

Aust. J. Phys.

View full text Add to dashboard Cite

SummaryThe angular distribution of 1·79 ±O· 05 Me V neutrons scattered from 'He has been measured in an effort to settle" a discrepancy in the phase shifts. The laboratory angular range 25° to 135° was covered. The results are compared with differential cross sections computed from the phase shifts of Dodder and Gammel (1952) and Demanins et al. (1962), and the data are seen to agree best with the former.

show abstract

Fast Neutron Physics: Part 1, Techniques

Cited by 19 publications

References 0 publications

Total neutron cross section for¹⁸¹Ta

Total neutron cross section for¹⁸¹Ta

Cosmic-ray neutron flux measurements above the atmosphere

The Angular Distribution of 1·79 MeV Neutrons Scattered from Helium

Contact Info

Product

Resources

About

Fast Neutron Physics: Part 1, Techniques

Cited by 19 publications

References 0 publications

Total neutron cross section for181Ta

Total neutron cross section for181Ta

Cosmic-ray neutron flux measurements above the atmosphere

The Angular Distribution of 1·79 MeV Neutrons Scattered from Helium

Contact Info

Product

Resources

About

Total neutron cross section for¹⁸¹Ta

Total neutron cross section for¹⁸¹Ta