Preparation and Use of Tritium and Deuterium Targets

Graves, E. R.; Rodrigues, Antônio Antunes; Goldblatt, Maxwell; Meyer, D. I.

doi:10.1063/1.1741621

Cited by 49 publications

(8 citation statements)

References 4 publications

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“…Targets of the thick Zr-T type 13 were bombarded with an unanalyzed beam of 180-kev deuterons in a Cockcroft-Walton accelerator. 14 During the experiment the rate of production of neutrons from the reaction was held constant and was continuously monitored by counting the companion alpha-particle rate with a KI scintillation detector.…”

Section: Methodsmentioning

confidence: 99%

Differential Elastic Scattering of 14-Mev Neutrons in Bi, Ta, In, Fe, and S

Elliot

1956

Phys. Rev.

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be an isotopic spin forbidden El from the 3 -state; the 1.72-Mev line would similarly be an isotopic spin forbidden El from the 0+ state. 19 However, the 0+ member would be formed via a first forbidden transition from N 16 while the 3-would result from an allowed transition. Hence, the 1.72-Mev to 2.75-Mev intensity ratio would be greatly decreased following N 16 decay as compared with F+p if the doublet assumption were valid. This is contrary to observation. The unlikelihood that our new state is a single 3-(alpha-particle model) state has already been discussed.We should now like to make a general comment on the situation as regards the comparison between the alpha-particle model of O 16 and experiment. So far, attention has centered on the agreement in energy between the theoretical and experimental levels; but if the model is to be acceptable it must also give an adequate account of the dynamical properties of the states. In particular, we should ask what the model has to say about the reduced alpha-particle widths. These show experimentally a very wide range from 0.15 percent of the Wigner limit for the 2+ state at 19 The need to investigate this alternative explanation has been particularly stressed by Professor H. T. Richards. S EVERAL investigators 1 "" 4 have recently reported measurements of differential elastic scattering cross sections for medium energy neutrons and have compared their results with the theoretical approach of Feshbach, Porter, and Weisskopf. 5 These experiments have been confined to the energy region 1-5 Mev. In order to examine the applicability of this theory to higher energy neutrons, the present study of the differential elastic scattering cross sections of selected f A portion of a dissertation submitted to the Graduate Faculty of the University of Maryland in partial fulfillment of the requirements for the degree of Doctor of Philosophy. 1 M. Walt and H. H. Barschall, Phys. Rev. 93, 1062 (1954). 2 S. C. Snowdon and W. D. Whitehead, Phys. Rev. 94, 1267 (1954). 3 M. Walt and J. R. Beyster, Phys. Rev. 98, 677 (1955). 4 Jennings, Weddell, Alexeff, and Hellens, Phys. Rev. 98, 582 (1955). 5 Feshbach, Porter, and Weisskopf, Phys. Rev. 96, 448 (1954).9.84 Mev to 85 percent of the Wigner limit for the 1-state at 9.58 Mev. Although one could not hope that the model would give a detailed account of the widths, it must at least predict allowed transitions for those states that show experimentally large reduced widths and forbidden transitions for those with very small widths. Unless such qualitative correspondence emerges between theory and experiment for the dynamical properties of the states the present agreement in energy must be regarded as largely fortuitous. It would also be very valuable to know the predictions of the alpha-particle model in relation to radiative widths. It appears probable 20 that the predicted lifetime of the alpha-particle model against pair emission from the 0+ state at 6.06 Mev is too short by a considerable factor. Again the emission of El radiation from the...

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Section: Methodsmentioning

confidence: 99%

Differential Elastic Scattering of 14-Mev Neutrons in Bi, Ta, In, Fe, and S

Elliot

1956

Phys. Rev.

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“…The most common metal hydride films use titanium as the "sorbent" [9][10][11][12][13]. Singleton and Yannopoulos [14] measured the loss rate of tritium in titanium tritide, yttrium tritide and scandium tritide films at elevated temperatures under several different ambient environments.…”

Section: Fabrication Of the Scandium Tritide Targetmentioning

confidence: 99%

“…The fast neutron detection efficiency of the liquid scintillator was calibrated using an 241 Am- 9 Be source which generates neutrons through 9 Be(α,n) 12 C. This source has a calibrated neutron strength of (7.1±0.7)×10 3 n s −1 and was placed on the axis of the detector with a separation of 20.6 cm, the same distance between the tritiated target and the neutron detector in the gamma-ray angular distribution runs. Gamma rays and neutrons generated by the source could be cleanly separated by pulse shape discrimination.…”

Section: Neutron Yieldsmentioning

confidence: 99%

A compact 3H(p,γ)4He 19.8-MeV gamma-ray source for energy calibration at the Sudbury Neutrino Observatory

Poon

Komar

Waltham

et al. 2000

Nuclear Instruments and Methods in Physics Research Section A:

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The Sudbury Neutrino Observatory (SNO) is a new 1000-tonne D 2 OČerenkov solar neutrino detector. A high energy gamma-ray source is needed to calibrate SNO beyond the 8 B solar neutrino endpoint of 15 MeV. This paper describes the design and construction of a source that generates 19.8-MeV gamma rays using the 3 H(p, γ) 4 He reaction ("pT "), and demonstrates that the source meets all the physical, operational and lifetime requirements for calibrating SNO. An ion source was built into this unit to generate and to accelerate protons up to 30 keV, and a high purity scandium tritide target with a scandium-tritium atomic ratio of 1:2.0±0.2 was included. This pT source is the first self-contained, compact, and portable high energy gamma-ray source (E γ >10 MeV).

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“…The exclusion principle is also expected to reduce the cross section in D by a sizeable factor below the free neutron cross section. 6 Accordingly, the highest cross section would be expected in Be for ir + mesons.…”

mentioning

confidence: 99%