Level structure of A40
TL;DR: In this article, the energy spectrum of inelastically scattered protons leading to excited levels in A 40 has been measured at bombarding energies of 7.32 and 9.39 MeV using the Livermore variable-energy cyclotron.
About: This article is published in Nuclear Physics.The article was published on 1961-11-01. It has received 13 citations till now. The article focuses on the topics: Proportional counter & Excited state.
Citations
More filters
TL;DR: In this paper, a compilation of experimentally determined properties of energy levels of Z = 11−21 nuclei with special emphasis on nuclear spectroscopy is presented. But this compilation is limited to the case of nuclear spectrograms.
607 citations
TL;DR: In this article, the experimentally determined properties of energy levels of A = 21−44 nuclei are compiled and evaluated with emphasis on nuclear spectroscopy, and the available information on excitation energies, spins, parities, isospins, lifetimes or widths and observed decay is summarized in a master table.
593 citations
325 citations
TL;DR: In this article, the nuclear spectroscopic information for the known nuclides of mass 40 (Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti) has been evaluated.
69 citations
TL;DR: In this article, the experimental nuclear structure data and decay data are evaluated for the known nuclides of mass 40 (Mg, Al, Si, P, S, Cl, Ar, K, Ca, Sc, Ti), with the best values recommended for level energies, half-lives, γ -ray energies and intensities, decay properties (energies, intensities and placement of radiations).
51 citations
References
More filters
Book•
[...]
01 Jan 1955
TL;DR: In this article, a few moments to read a book, even only few pages, is recommended, and a book is not obligation and force for everybody to read it even if they don't want to read.
Abstract: Spend your few moment to read a book even only few pages. Reading book is not obligation and force for everybody. When you don't want to read, you can get punishment from the publisher. Read a book becomes a choice of your different characteristics. Many people with reading habit will always be enjoyable to read, or on the contrary. For some reasons, this atomic nucleus tends to be the representative book in this website.
2,057 citations
TL;DR: In this paper, a simple Born-approximation analysis of the elastic data yields values of the effective radii and surface thicknesses of the nuclear charge densities which (if suitably corrected for failure of the Born approximation) are in substantial agreement with the results of Hahn, Ravenhall, and Hofstadter.
Abstract: A survey has been made of the differential scattering cross sections for 187-Mev electrons on the even-even nuclei $_{12}\mathrm{Mg}^{24}$, $_{14}\mathrm{Si}^{28}$, $_{16}\mathrm{S}^{32}$, $_{18}\mathrm{A}^{40}$, and $_{28}\mathrm{Sr}^{88}$. It has been possible to separate the elastic scattering from the inelastic in all cases and to resolve the inelastic groups from specific nuclear levels for at least one level in all cases. A simple Born-approximation analysis of the elastic data yields values of the effective radii and surface thicknesses of the nuclear charge densities which (if suitably corrected for failure of the Born approximation) are in substantial agreement with the results of Hahn, Ravenhall, and Hofstadter; i.e., a radius parameter of $c\ensuremath{\cong}1.08 {A}^{\frac{1}{3}}\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ cm (radius to half-maximum of the charge distribution) and a surface thickness of $t\ensuremath{\cong}2.5\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}13}$ cm (thickness from 10% to 90% of the maximum of the charge distribution). Phenomenological analysis of the inelastic scattering along the lines laid down by Schiff yields some tentative multipolarity assignments, and application of some results of Ravenhall yields estimates of (radiative) partial level widths; for the $E2$ transitions these correspond to lifetimes of \ensuremath{\sim}19\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ sec (Mg 1.37 Mev) to \ensuremath{\sim}1.4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ sec (Sr 1.85 Mev). The observed strengths of the transitions are compared to those predicted by Weisskopf theory.
699 citations
TL;DR: In this paper, the experimental material on energy levels published from December 1, 1953 to February 1, 1957 is covered along with the 1954 energy level compilation STAP, with little attention given to cross-section measurements.
Abstract: The experimental material on energy levels published from December 1, 1953 to February 1, 1957 is covered along with the 1954 energy level compilation STAP. M. Endt and J. C. Wuyver, Revs. Mod. Phys. 26, 95(1954)!. Little attention is given to cross-section measurements. Many particle reactions, as (n,2n) or spallation reactions, are omitted altogether. Theoretical papers are quoted only briefly. Numerous diagrams and tables and an extensive bibliography are given. (M.H.R.)
162 citations
TL;DR: In this paper, the range-energy relations for protons have been obtained for six substances (Be, C, Al, Cu, Pb, and air) and the calculations of the energy loss include the shell corrections at low energies and the density effect in the high-energy region.
Abstract: Range-energy relations for protons have been obtained for six substances (Be, C, Al, Cu, Pb, and air). The calculations of the energy loss $\frac{\mathrm{dE}}{\mathrm{dx}}$ include the shell corrections at low energies and the density effect which becomes important in the high-energy region. The present results can also be used to determine the range of $\ensuremath{\mu}$ mesons up to \ensuremath{\sim}10 Bev. Besides the calculated values of the ranges, tables of the ionization loss $\frac{\mathrm{dE}}{\mathrm{dx}}$ are also presented.
122 citations
TL;DR: The scattering of 18-Mev alpha particles from neon, argon, and xenon was studied with a multiplate reaction chamber in this paper, where the scattered particles were defined within an rms angular width of 0.45 by a system of slit pairs.
Abstract: The scattering of 18-Mev alpha particles from neon, argon, and xenon was studied with a multiplate reaction chamber. The scattered particles were defined within an rms angular width of 0.45\ifmmode^\circ\else\textdegree\fi{} by a system of slit pairs, spaced every 2\textonehalf{}\ifmmode^\circ\else\textdegree\fi{} from 10\ifmmode^\circ\else\textdegree\fi{} to 170\ifmmode^\circ\else\textdegree\fi{}. The elastic scattering from neon and argon show the pronounced maxima and minima characteristic of diffraction scattering but are equidistant in $\ensuremath{\varphi}$, not $sin(\frac{\ensuremath{\varphi}}{2})$. The ratio to Rutherford scattering varies as much as 25-fold between successive maxima and minima in the case of neon, the well-defined structure indicating a small mean free path for absorption of alpha particles in the nucleus. Nuclear interaction radii calculated by the formula $2kR\ensuremath{\Delta}[sin(\frac{\ensuremath{\varphi}}{2})]=\ensuremath{\pi}$ were found to be 6.36\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ cm for neon and 6.95\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ cm for argon. Xenon, investigated chiefly for control purposes, showed no definite deviation from Rutherford scattering up to 50\ifmmode^\circ\else\textdegree\fi{}. Groups corresponding to the excitation of the 1.63-, 4.25-, 4.97-, 5.81(5.63)-, and 7.2-Mev levels of ${\mathrm{Ne}}^{20}$ and the 1.46-Mev level of ${\mathrm{A}}^{40}$ were observed. No excited states were observed in xenon. Notably absent was excitation of the 6.74-Mev ${(0}^{+}$) level in ${\mathrm{Ne}}^{20}$. As predicted by direct-interaction theories, the cross sections for inelastic scattering leading to the first excited ${(2}^{+}$) states of neon and argon could be approximated by the squares of spherical Bessel functions of the second order with interaction radii of 6.71\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ cm for neon and 6.60\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}13}$ cm for argon. These cross sections do not tend toward small values in the forward direction, which is interpreted as evidence for distortion of the incident and scattered waves. No fit was possible for any of the other excited states.
38 citations