Precise Determination of Nuclear Reaction Energies and Measurements of Resonance Widths

Bondelid, R.O.; Kennedy, Christopher

doi:10.1103/physrev.115.1601

Cited by 67 publications

(2 citation statements)

References 22 publications

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“…This concept has been tested using 27 Al(p,γ) 28 Si reaction, which results in 2 coincident γ's of 2.8 MeV and 1.78 MeV providing a convenient route for positron lifetime measurements. The reaction has a strong resonance at 992 keV proton energy [15], which leads to high efficiency γ-production at 1 MeV proton energy. First experiment [6] was illustrated by focusing a 1.5 MeV proton beam of 0.2 µA from a Van de Graaff accelerator onto a thin Al window mounted at the end of the proton beam line.…”

Section: Proton Capture Induced Pasmentioning

confidence: 99%

Gamma Induced Positron Annihilation: History, Current, and Future Developments

Selim

2017

Acta Phys. Pol. A

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Positron annihilation spectroscopy is often performed using radioactive sources for bulk measurements or positron beams for depth resolved measurements. Both have many advantages and great capabilities for a variety of applications. In the recent history, we have shown that positron annihilation spectroscopy can be carried out directly using high energy photons without the need for positron source or positron beam. This approach brings unique capabilities for some specific applications and promotes the use of positron annihilation spectroscopy in new areas of materials science and probably in industrial applications. Some of the important applications include developing new nondestructive highly penetrating sensitive probe for structural and engineering materials. It can also greatly advance positron applications in bulk semiconductors, electronic and photonic materials as well as in polymers, ceramics, and liquids. The recently developed γ-induced positron spectroscopy in HZDR in Dresden provides an example of an excellent facility for many of these applications. When incorporated with pulsed accelerators, γ-induced positron annihilation spectroscopy may trigger novel studies of transient states in matter and explore several solid-state processes that take place on short time scale. In this article I will review the history and development of the technique and its incorporation in a wide range of accelerators including table top electron accelerators, pulsed electron accelerators, and Van de Graaff accelerators. Then I will introduce a design for a new γ-induced positron annihilation spectroscopy facility based on using small nuclear research reactors or neutron generators. The paper presents all the possible approaches for γ-induced positron annihilation spectroscopy and discusses its potential and limitations to guide the efforts in further development of the technique and illustrate the unique aspects that the technique can bring to positron science and applications.

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Section: Proton Capture Induced Pasmentioning

confidence: 99%

Gamma Induced Positron Annihilation: History, Current, and Future Developments

Selim

2017

Acta Phys. Pol. A

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“…The energy dependence of the total neutron emission cross section for s waves in the region immediately above threshold is~-(t1Z)-', (6) where dE, is the difference between the bombarding energy and the threshold energy. Therefore, if a target of finite thickness is used, the total neutron yield is proportional to the integral of Eq.…”

Section: Neutron Thresho1d Measurementsmentioning

confidence: 99%