J-dependence in l = 2 (3He, α) reactions on 24Mg, 28Si and 30Si

doi:10.1016/0375-9474(69)90247-4

Nuclear Physics A

Volume 138, Issue 3, 8 December 1969, Pages 657-670

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Abstract

In order to investigate a possible j-dependence in the l = 2 angular distributions of ³He induced direct reactions in the region of the ld-shell nuclei, (³He, α) reactions on the target nuclei ²⁴Mg, ²⁸Si and ³⁰Si were measured at incident energies E_inc of 18 and 20 MeV. The stability of the shape of the angular distributions against variations of E_inc demonstrates that the direct reaction contribution prevails even at backward angles in the region of small cross sections. There is a difference between the shape of the $Δj = 32^{+} and Δj = 52^{+}$ angular distributions at θ_c.m = 45° which is common to all nuclei studied; at this angle the $Δj = 32^{+}$ curves show a deep minimum which is absent in the case of the $Δj = 52^{+}$ angular distributions. This systematic experimental j-dependence can be reproduced by DWBA calculations; the theoretical results agree well with the experimental ones in the region of large cross sections up to about 60°.

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Nuclear Data Sheets for A=23
2021, Nuclear Data Sheets
Evaluated spectroscopic data and level schemes from radioactive decay and nuclear reaction studies are presented for ²³N, ²³O, ²³F, ²³Ne, ²³Na, ²³Mg, ²³Al, and ²³Si. This evaluation for A=23 supersedes the earlier one by R. B. Firestone (2007Fi02).
Highlights of this evaluation are the following:
The recommended absolute γ-ray emission probability (%Pγ) in the ²³Ne β-decay was reported with 3.0% systematic uncertainty in 1986BrZQ. In 2007Fi02, the Pγ for the most intense γ ray was recommended with 4% uncertainty. These uncertainties are comparable with the total excited state β feeding uncertainty of 33 l, resulting from 100–67 l (g.s. β feeding) in ²³Na (1963Ca06). In this evaluation, notes are added for relative and absolute γ-ray emission probabilities.
From new measurements 2020Kw01 constrain the spin of the 7788 keV level, the dominant resonance state for the ²²Na(p,γ)²²Mg reaction rate at stellar temperature, in ²³Mg to (3/2⁺,5/2⁺). Earlier assignment was 7/2⁺.
The ²³Al ε decay scheme appears to be incomplete. Some of the latest reported data on the ²³Al ε decay study in the literature need verification.
Nuclear Data Sheets for A = 23
2007, Nuclear Data Sheets
This evaluation of A = 23 has been updated from previous evaluations published in 1998En04, 1990En08, and 1978En02. Coverage includes properties of adopted levels and γ rays, decay-scheme data (energies, intensities and placement of radiations), and cross reference entries. The following tables continue the tradition of showing the systematic relationships between levels in A = 23. These assignments are based on spectroscopic factors and energy differences where $Δ E_{x} = E_{x} ({}^{23}{Mg}) - E_{x} ({}^{23}{Na})$ .
Interactions of polarized 3He particles with 24Mg
1981, Nuclear Physics, Section A
Differential cross sections and analysing powers have been measured for the elastic and inelastic scattering of 33.3 MeV polarized ³He particles by ²⁴Mg and simultaneously for the (³He, d) and (³He, α) reactions leading to the g.s. $(52^{+}), 0.451 MeV (12^{+}) and 0.945 MeV (32^{+})$ states of ²⁵Al and to the g.s. $(32^{+}), 0.451 MeV (52^{+}) and 2.05 MeV (72^{+})$ states of ²³Mg. The obtained results are compared with the optical model, DWBA, coupled-channels and coupled reaction channels calculations.
Energy levels of A = 21-44 nuclei (VI)
1978, Nuclear Physics, Section A
The experimentally determined properties of the A = 21–44 nuclei are compiled and evaluated, special emphasis being given to nuclear structure.
Separate tables for each of the nuclides reviewed give all available information about the following properties in this order: - excitation energies (E_x),
1. •
  - γ-ray branching ratios,
2. •
  - γ-ray mixing ratios (δ),
3. •
  - lifetimes (τ_m) or widths (Λ),
4. •
  - spin and parity (J^π) and isospin (T) assignments, and
5. •
  - any other data, on single-particle transfer, resonance levels, etc.
The “best” (or adopted) values for E_x, τ_m or Λ, J^π and T are summarized in a master table.
The review of each A-chain concludes with - a discussion of isospin multiplets,
1. •
  - a few remarks about the experimental situation, and
2. •
  - a compilation of references to relevant theoretical papers.
Study of the 17O(α, d)19F reaction
1978, Nuclear Physics, Section A
Study of the reaction 12C + 13C → α + 21Ne
1975, Nuclear Physics, Section A
The reaction $^{12} C +^{13} C → α +^{21} Ne$ has been investigated at a c.m. bombarding energy of 14.5 MeV using beams of both ¹²C and ¹³C. The α-particle reaction products were recorded using a multiple-angle spectrograph. Seventy-six levels were observed below 12.56 MeV in ²¹Ne; 28 levels from 9.42 to 12.56 MeV are reported for the first time. The data are consistent with a compound-nucleus reaction mechanism.

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^†: Now at the Institute for Nuclear Physics of KFA Jülich, Jülich.

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Nuclear Physics A

Abstract

References (13)

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nuclear stripping reactions

Cited by (32)

Nuclear Data Sheets for A=23

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Energy levels of A = 21-44 nuclei (VI)

Study of the <sup>17</sup>O(α, d)<sup>19</sup>F reaction

Study of the reaction <sup>12</sup>C + <sup>13</sup>C → α + <sup>21</sup>Ne