Three absolute energy calibration points for protons below 3 MeV

doi:10.1016/0029-5582(64)90640-6

Nuclear Physics

Volume 53, April–May 1964, Pages 618-624

https://doi.org/10.1016/0029-5582(64)90640-6 Get rights and content

Abstract

An electrostatic beam-energy analyser has been used to make absolute energy measurements of the following resonances and threshold: Be⁹(p, γ)B¹⁰, 1083.2±0.4 keV; N¹⁵(p, αγ)C¹², 897.37±0.29 keV; and O¹⁸(p, n)F¹⁸, 2576.72±0.77 keV. The widths of the two resonances were measured to be 3.25±0.33 keV and 1.5±0.3 keV, respectively. For calibration purposes, the peak of a thin-target resonance yield curve, the midpoint of the rise of a thick-target resonance yield curve, and the intercept of the extrapolated threshold yield curve do not correspond precisely to the above values, but corrections are given to enable such yield curves to be used directly for energy calibration of proton beam-energy analysers.

References (20)

L.A. König et al.
Nuclear Physics
(1962)
C.H. Carlson et al.
Int. J. Appl. Rad.
(1959)
K.L. Dunning et al.
Phys. Rev.
(1958)
R.O. Bondelid et al.
Phys. Rev.
(1959)
R.O. Bondelid et al.
Phys. Rev.
(1960)
R.O. Bondelid et al.
Phys. Rev.
(1960)
R.O. Bondelid et al.
Phys. Rev.
(1963)
K.R. Symon
Ph. D. Thesis
W.F. Hornyak et al.
University of Maryland, Technical Report 300
(April 1963)
W.F. Hornyak et al.
Phys. Rev.
(1953)

There are more references available in the full text version of this article.

Cited by (13)

Energy levels of light nuclei A = 8,9,10
2004, Nuclear Physics A
The 9Be(p, γ)10B cross section at low energies
2002, Nuclear Physics A
Data for the ⁹Be(p, γ)¹⁰B reaction with proton energies up to 1800 keV are fitted using R-matrix formulae that include channel contributions where appropriate. The data include values of the astrophysical S factor, the branching ratios for γ-transitions to the four lowest states of ¹⁰B, angular distributions and analysing powers. Use is made of experimental values of asymptotic normalization constants obtained from ⁹Be(¹⁰B, ⁹Be) ¹⁰B. A good fit is obtained with two 1⁻ levels, two 2⁻ levels, one 0⁺ level and one 2⁺ level.
A compilation of charged-particle induced thermonuclear reaction rates
1999, Nuclear Physics A
Low-energy cross section data for 86 charged-particle induced reactions involving light (1 ⩽ Z ⩽ 14), mostly stable, nuclei are compiled. The corresponding Maxwellian-averaged thermonuclear reaction rates of relevance in astrophysical plasmas at temperatures in the range from 10⁶ K to 10¹⁰ K are calculated. These evaluations assume either that the target nuclei are in their ground state, or that the target states are thermally populated following a Maxwell-Boltzmann distribution, except in some cases involving isomeric states.
Adopted values complemented with lower and upper limits of the rates are presented in tabular form. Analytical approximations to the adopted rates, as well as to the inverse/direct rate ratios, are provided.
Quantification of the separate matrix constituents of spheroidal graphite cast iron implanted with 15N by nuclear reaction analysis using an ion muprobe
1992, Nuclear Inst. and Methods in Physics Research, B
The retained dose of nitrogen in a spheroidal graphite (SG) cast iron (4% carbon) implanted with $2 × 10^{17}^{15} solN cm^{2}$ at 200 keV has been determined separately in the iron matrix and in the graphite inclusions of 30 μm average diameter randomly dispersed in the matrix, using the ¹⁵N(p, αγ)¹²C resonance at 898 keV and a proton muprobe focussed to less than 20 μm spot diameter. In normalised and tempered SG cast iron the retained doses were 1.09 × 10¹⁷ and $1.74 × 10^{17} N cm^{2}$ in the pearlitic matrix and graphite nodules, respectively, and in induction hardened SG cast iron the retained doses were 1.18 × 10¹⁵ and $0.97 × 10^{17} N cm^{2}$ in the martensitic matrix and nodules, respectively. The profile shapes are also quite different in both types of samples, and in both matrix and nodule.
Isospin mixing in 2- levels in 16O
1983, Nuclear Physics, Section A
The ¹⁵N(p, p)¹⁵N and ¹⁵N(p, α₁)¹²C(4.439) reactions have been used to measure the proton and α-particle widths of the ¹⁶O J^π = 2⁻ levels at excitation energies of 12.530 MeV and 12.9686 MeV. Excitation functions for the reactions were obtained at four angles using a differentially pumped gas target and a proton beam from the Queen's University 4 MV Van de Graaff accelerator. The data were analyzed using the R-matrix formalism, and the proton and α-particle widths of the resonances were determined to be Γ_p = 25 ± 3eV, Γ_α1 = 72 ± 10 eV and Γ_p = 0.99 ± 0.12 keV, Γ_α1 = 0.60 ± 0.08 keV for the 12.530 MeV and 12.9686 MeV states respectively. The charge-dependent matrix element responsible for the isospin mixing of the two states is deduced to be 〈T = 0|H_c|T = 1〉 = 181 ± 10 keV.
Search for a possible Jπ = 0+, T = 2 resonance in 9Be(τ, γγ)12C
1972, Nuclear Physics, Section A
A 50 cm³ Ge(Li) detector has been used to re-examine the reaction ⁹Be(τ, γγ)¹²C over a previously reported resonance at E(τ) = 1.739±0.007 MeV which was suggested as the lowest T = 2 state in ¹²C. This state is expected to γ-decay via the 1⁺, T = 1 state at 15.11 MeV. However a search with τ bombarding energies ranging two standard deviations above and below the reported resonance energy revealed no resonance in high-energy γ-rays. An upper limit of Γ_τΓ_γ/Γ < 2.0 meV is established for the T = 2 resonance strength which is one-fourth of the previously reported strength and which strongly corroborates an additional negative result reported as Γ_τΓ_γ/Γ < 1.5 meV. In the course of the experiment a new value of Γ_lab = 2.94±0.20 keV was obtained for the resonance at E_p = 1.083 MeV in ⁹Be(p, γ)¹⁰B.

View all citing articles on Scopus

^†: Present Address: Dept. of Physics and Astronomy, Michigan State University, East Lansing, Michigan.

View full text

Article preview

Nuclear Physics

Abstract

References (20)

Nuclear Physics

Int. J. Appl. Rad.

Phys. Rev.

Phys. Rev.

Phys. Rev.

Phys. Rev.

Phys. Rev.

Ph. D. Thesis

University of Maryland, Technical Report 300

Phys. Rev.

Cited by (13)

Energy levels of light nuclei A = 8,9,10

The <sup>9</sup>Be(p, γ)<sup>10</sup>B cross section at low energies

A compilation of charged-particle induced thermonuclear reaction rates

Quantification of the separate matrix constituents of spheroidal graphite cast iron implanted with <sup>15</sup>N by nuclear reaction analysis using an ion muprobe

Isospin mixing in 2<sup>-</sup> levels in <sup>16</sup>O

Search for a possible J<sup>π</sup> = 0<sup>+</sup>, T = 2 resonance in <sup>9</sup>Be(τ, γγ)<sup>12</sup>C