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2 edition of Ground-state photoneutron reactions in (14)C and (18)O. found in the catalog.

Ground-state photoneutron reactions in (14)C and (18)O.

Peter Chung-Kuang Kuo

Ground-state photoneutron reactions in (14)C and (18)O.

by Peter Chung-Kuang Kuo

  • 180 Want to read
  • 7 Currently reading

Published .
Written in English

    Subjects:
  • Physics Theses

  • Edition Notes

    Thesis (Ph.D.), Dept. of Physics, University of Toronto

    ContributionsMcNeill, K. G. (supervisor)
    The Physical Object
    Pagination182 p.
    Number of Pages182
    ID Numbers
    Open LibraryOL16352177M

    The purpose of this study is to measure the photoneutron emission rate after the shutdown of an operational BWR. The photoneutrons originate from the D(γ, n)H reaction in the moderator region Missing: book. Abstract. Experimental data on the cross sections of partial photoneutron reactions, obtained for , Os isotopes using quasimonoenergetic annihilation photon beams and neutron multiplicity sorting method, are analyzed. Using special criteria (transition multiplicity functions F i = σ(γ, in)/σ(γ, xn), the ratios of the cross section of the corresponding partial reaction to the total Cited by: 7.

    Photoneutron reactions studies at ELI-NP using a direct neutron multiplicity sorting method Workshop on Level Density and Gamma Strength 8 – 12 May Oslo • measured both at Livermore and Saclay • recently remeasured using 55 MeV maximum energy Bremsstrahlung photon beam at Moscow, by Prof. Varlamov’s group. • One of the candidates for investigating the discrepancies between File Size: 3MB. neutron reaction in Krypton • • • • • •.. • • 28 Total neutron reaction cross section in Krypton plotted section for inelastic electron scattering from the ground state to a discrete excited state is given in Born approximation (neglecting nuclear recoil and assuming the electron mass energy is small com-.

    This thesis deals with the systematic study of photoneutron reactions in the astrophysically relevant energy region just above the neutron threshold. Photodisintegration reactions play a decisive role in the nucleosynthesis of elements heavier than iron. A large number of proton-rich isotopes are believed to be exclusively produced by a combination of (γ,n), (γ,p) and (γ,α) reactions. Excitation of nuclear isomeric states in photoneutron reactions in the giant E1 resonance region Article in Physics of Particles and Nuclei 31(2) March with 8 Reads.


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Ground-state photoneutron reactions in (14)C and (18)O by Peter Chung-Kuang Kuo Download PDF EPUB FB2

Photoneutron angular distributions were measured by time-of-flight techniques for the reaction 15 N(γ, n 0) 14 N over the region of excitation energy from 15 to 25 MeV. Ground state cross sections were obtained by stepping the bremsstrahlung end point over Missing: book.

Abstract Differential photoneutron cross sections were measured by time-of-flight techniques for the reactions ^{14}{rm C}(gamma,n _0)^{13}{rm C} and ^{18}{rm O}(gamma,n_0)^{17}O as functions of laboratory angle between 48^ circ and ^circ over the excitation energy region from 10 to 26 g: book.

Photoneutron angular distributions and differential Ground-state photoneutron reactions in book sections have been measured for the reaction 17 O(γ,n 0) 16 O over the excitation energy region from 10 to 24 MeV. The angle-integrated ground state cross section was obtained and compared to the total photoneutron cross g: book.

Physical Review. C, Nuclear Physics [01 Feb31(2)] Type: Journal Article DOI: /PhysRevCCited by: 1. Photoneutron spectra for transitions to the ground state in the giant resonance of 16 O were measured with high neutron energy resolution (ΔE ~ 60 keV) at angles of 50, 66, 82, 98, and degrees relative to the direction of the incident bremsstrahlung beam.

The spectra at the various angles were measured during successive experimental runs using a single 50 m time-of-flight Cited by: 9. For reactions to the ground state in 13 N it appears that most of the photon absorption in the giant resonance region studied forms J π = 2 − states in 14 N which decay by d-wave neutron emission.

Some evidence was found for the existence of J π = 0 − strength at Cited by: 5. Photoneutron spectra for transitions to the ground state in the giant resonance of 16O were measured with high neutron energy resolution (ΔE ~ 60 keV) at angles of 50, 66, 82, 98, and.

THE PHOTONEUTRON CROSS SECTION IN THE GIANT RESONANCE REGION FOR SEVERAL 82 NEUTRON ISOTONES. Iowa State University, Ph.D., Physics, nuclear University Microfilms, A XEROX Company, Ann Arbor, Michigan.

This thesis deals with the systematic study of photoneutron reactions in the astrophysically relevant energy region just above the neutron threshold. Photodisintegration reactions play a decisive role in the nucleosynthesis of elements heavier than iron.

A large number of proton-rich isotopes are believed to be exclusively produced by a. Photoneutron spectroscopy with monoenergetic gamma rays is a novel method for detection of bulk explosives.

In a report [13], one of the authors suggested using a Shalev–Cuttler ionization chamber for explosives by: 8. Noticeable at a relatively low photon energy are the photoneutron reactions: 2 H(γ,n) 1 H and 9 Be(γ,n) 8 Be; with threshold energies of and MeV, respectively, since these two nuclides have the lowest neutron separation energy among all nuclides.

Nuclear Physics AM () North-Holland Publishing Company PHOTONEUTRON CROSS SECTION FOR "Si* G. ODGERS, B.L. BERMAN*, R.E.

PYWELL** and M.N. TUOMPSON School of Physics, University of Melbourne, Parkville, VictoriaAustralia Received 12 May Abstract: The photoneutron cross section for 30Si has been measured over the energy range 10 to 28 MeV using Cited by: 6.

reaction threshold, where ω is the energy of the photon quanta, σ is the photonuclear reaction cross section; E the energy of the electron 2and W is bremsstrahlung photons spectrum.

EXFOR (Library of experimental nuclear cross Table Photoneutron source strength The. Introduction Studies of total photoneutron cross sections and studies of reactions to the ground state of the daughter nucleus have been shown to be valuable tools in investigating the single-particle and isospin nature of transitions in the giant resonance by: 1.

Abstract The photoneutron cross sections for 14 C [σ(γ,1n) and σ(γ,2n)] have been measured up to 36 MeV using monochromatic photons. The cross section for the emission of a single neutron displays a very prominent resonance near 15 MeV which appears to decay primarily to the ground state of 13 C.

The (γ,2n) cross section is sharply peaked at 26 MeV and is large compared with those for 12 Missing: book. Ground state differential cross sections are given for all reactions, rangingmore» Upper limits of about 1 to 25 nb/sr were determined for the ground state cross sections of the reactions 48 Ca(α, 8, 10, 11 B) 44, 42, 41 Cl and 48 Ca(α, 10 - 13 C) 42 - 39 S at : Costa, S.

The cross section for that photoneutron reaction in 16 O which leaves 15 O in its ground state has been measured for photon energies ranging from 17 to 30 MeV, i.e.

at energies corresponding to giant resonance excitations in 16 O. Time-of-flight methods, yielding resolutions equal to keV at a neutron energy of 6 MeV, were used to measure neutron spectra emitted at an angle of 98° when Cited by:   Yields of photonuclear reactions on Au nuclei were measured in a beam of bremsstrahlung photons, the endpoint energy of the bremsstrahlung spectrum being MeV.

These measurements were performed by means of the gamma-activation procedure. The results obtained in this way were compared with the results of earlier experiments and theoretical by: 2. Photoneutron production in tissue during high energy bremsstrahlung radiotherapy.

the dose equivalent due to all photonuclear reactions in tissue is estimated for energies of 24 and 30 MeV. Export citation and abstract Ross C K and Sherman N K b Ground-state photoneutron angular distribution for 14 N Nucl. Phys. A Cite as: dium of Chemical Terminology, 2nd ed.

(the "Gold Book"). Compiled by A. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford Missing: photoneutron. Abstract. A joint analysis of the experimental data on cross sections of total and partial photoneutron reactions is performed for the In isotope.

The data are obtained by using the quasimonoenergetic photons generated upon the annihilation of relativistic by: 5.Abstract.

The well-known significant systematic disagreements between data on partial photoneutron reaction cross sections obtained in experiments using quasimonoenergetic annihilation photons and bremsstrahlung were investigated using objective physical criteria of data by: 4.

Using objective physical criteria for data reliability, cross sections of partial photoneutron reactions (γ, 1n), (γ, 2n) and (γ, 3n) that are free of the shortcomings of neutron multiplicity sorting methods used on beams of quasimonoenergetic annihilation photons are obtained for Pr and W nuclei.

Evaluation is performed using the experimental–theoretical method (ETM), based on the Cited by: 2.