Elsevier

Nuclear Physics A

Volume 268, Issue 1, 7 September 1976, Pages 1-204
Nuclear Physics A

Energy levels of light nuclei A = 13–15

https://doi.org/10.1016/0375-9474(76)90563-7Get rights and content

Abstract

Compilation of energy levels of A = 13, 14 and 15 nuclei, with emphasis on material leading to information about the structure of the A = 13–15 systems.

References (4)

  • Suppt. to Research Report of L.N.S., Tohoku University

    (1972)
    referred to herein as...
  • referred to herein as...
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    Nevertheless, to apply this resonance for energy calibration, its position has to be determined as accurately as possible. The energy of this resonance had been established earlier as 1449.5 ± 1.5 keV with a width of 7.0 ± 0.5 keV [14] based on the work of Tryti et al. [15]. Tryti’s work focused on the angular distributions of protons, obtained from the shape of the Doppler-shifted γ-lines, aiming to gain insight to the complex character of the reaction.

  • Evaluation of the <sup>12</sup>C(d, p<inf>0</inf>)<sup>13</sup>C reaction cross-section for energies and detection angles suitable for nuclear reaction analysis

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    The positions of the corresponding resonances, as well as the widths, Γ, and the Jπ assignments that are used as input in the code, were taken from nuclear reviews and compilations, such as [33] and [34], with certain modifications, while the partial widths Γp, and the spin mixing parameters were tuned inside the code in order to be in accordance with the main bulk of experimental data. Two notable exceptions concerned: (a) The addition in the calculations of a relatively broad, low-energy resonance (Ed,lab ∼ 809 keV, Γ = 192 keV) which has not been observed in the past in the d+12C system, but rather in the p+13C one, yielding the same compound nucleus [34], and (b) The large increase in the width Γ of the broad, high-energy resonance (Ed,lab ∼ 2.205 MeV, Γ ∼ 500 keV), which could be partly justified by the existence of another overlapping broad resonance observed in the past in [14] around 2.05 MeV, which is present in literature concerning the 12C(d,n) reaction, but is not mentioned, or included in [33,34]. With these two modifications the evaluation succeeded in reproducing the high- end and the low-energy tail of the benchmarking spectra, as analyzed in the following section.

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  • A detailed study of the <sup>12</sup>C(d, p<inf>0</inf>)<sup>13</sup>C reaction at detector angles between 135° and 170°, for the energy range E<inf>d, lab</inf> = 900-2000 keV

    2006, Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms
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    Thus, the overall error in the absolute differential cross-section measurements varied between ∼6% and 22% depending mainly on the target. The reported cross-section values correspond to the half of the target’s thickness according to the usual convention, following SRIM 2003 calculations [11]. The cross-section maxima reported in the past [3,10] at Ed, lab = 920, 1190, 1310, 1449 and 1792 keV, corresponding to excited states of 14N, were also identified in the present work.

  • A detailed study of the <sup>nat</sup>C(d, d<inf>0</inf>) reaction at detector angles between 145° and 170°, for the energy range E<inf>d, lab</inf> = 900-2000 keV

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    This method implies the specific selection of a beam-light target element combination and is particularly useful in the case of a single light element (absence of overlapping resonances from other light elements) present in a medium mass matrix (excessive elastic scattering from the matrix reduces the method’s sensitivity). For carbon profiling, the strong resonance of the 12C(p, p0) reaction at Ep,lab ≅ 1.74 MeV [1,2], which is thoroughly analyzed in literature, is mainly used. In the case of multiple light element coexistence in the matrix though, when the 12C(d, p0)13C reaction seems to be more applicable for precise quantitative carbon profiling analysis, the knowledge of the differential natC(d, d0) reaction cross-section – which strongly deviates from the Rutherford formula – is imperative for the simultaneous analysis of RBS/NRA spectra at steep backscattering angles.

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This work has been supported by the National Science Foundation [MPS 74-10071] and by the Energy Research and Development Administration [E(11-1) 2785].

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