Beta decay of 23Mg and 27Si

doi:10.1016/0375-9474(74)90194-8

Nuclear Physics A

Volume 235, Issue 2, 16 December 1974, Pages 299-306

https://doi.org/10.1016/0375-9474(74)90194-8 Get rights and content

Abstract

The β-decays of ²³Mg and ²⁷Si have been studied by observing the delayed γ-radiation. The following branches (and log ft values) have been found for $^{23} Mg (β^{+})^{23} Na : 0 keV, 0.914 ± 0.002 (3.67); 440 keV, 0.086 ± 0.002 (4.40); and 2391 keVa (6.9 ± 0.9) × 10^{−5} (4.98); and for^{27} Si (β^{+})^{27} Al : 0 keV, 0.9977 ± 0.0002 (3.61); 1014 keV, (4.9 ± 2.4) × 10^{−5} (7.3); 2211 keV, (1.80 ± 0.13) × 10^{−3} (4.68); 2734 keV, (1.55 ± 0.17) × 10^{−4} (5.02); and 2981 keV, (2.59 ± 0.24) × 10^{−4} (4.33)$ . The branches to the 2391 keV level from the ²³Mg decay and to the 2734 keV level from the ²⁷Si decay have not been previously reported. A comparison is made between the experimental results and the predictions of the many-particle shell model.

References (22)

S. Gorodetzky et al.
Nucl. Phys.
(1968)
C. Détraz et al.
Phys. Lett.
(1971)
D. Berenyi et al.
Nucl. Phys.
(1971)
P.M. Endt et al.
Nucl. Phys.
(1973)
J.N. Bahcall
Nucl. Phys.
(1966)
J.D. Goss et al.
Nucl. Phys.
(1968)
J.B. McGrory et al.
Phys. Lett.
(1971)
J.B. McGrory
Phys. Lett.
(1970)
M.J.A. de Voigt et al.
Nucl. Phys.
(1972)
R.S. Storey et al.
Can. J. Phys.
(1959)

W.L. Talbert et al.

Phys. Rev.

(1960)

Cited by (18)

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 = 27
2011, Nuclear Data Sheets
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 $Δ E_{x} = E_{x} ({}^{23}{Mg}) - E_{x} ({}^{23}{Na})$ .
Data analysis techniques for extracting Gamow-Teller strengths from 0° (p, n) data
2001, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Techniques are described to obtain absolute normalizations for Gamow–Teller strength functions from (p,n) spectra. A method using data taken at two different proton energies and a method using polarization transfer data are discussed. Both methods require determining the number of counts due to the Fermi transition which is usually not completely resolved. We discuss methods for normalizing to unresolved Fermi peaks and handling peak shapes encountered in real time-of-flight spectra.
(<sup>6</sup>Li,<sup>6</sup>He) reaction at 100 MeV/nucleon as a probe of spin-excitation strengths
1999, Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
For a selective excitation of spin-flip strength, (⁶Li,⁶He) reactions can be a useful tool, because: a) ⁶Li and ⁶He have ground-state spin and parity values J^π = 1⁺ and 0⁺, respectively; b) ⁶He has no particle-stable excited state, thus effects from ejectile excitation can be avoided. The (⁶Li,⁶He) experiments were performed at 100 MeV/nucleon, at which incident energy the reaction is expected to be single-step dominant. Through the analysis of the good-resolution (⁶Li,⁶He) data on ¹³C, ²⁶Mg, ²⁷Al and ⁵⁸Ni targets, the evidence for a proportional relationship between 0° cross sections and the corresponding Gamow-Teller transition strengths is examined. Suppression of non-spin flip excitations is discussed based on the hindrance of the excitation of the isobaric analog state.
Energy levels of A = 21-44 nuclei (VII)
1990, Nuclear Physics, Section A
The experimentally determined properties of A = 21–44 nuclides are complied and evaluated with special emphasis on nuclear spectroscopy.
Separate tables for each of the nuclides reviewed present the available information about the following properties (in this order):
- •
  - excitation energies E_x,
- •
  - γ-ray branching ratios b(γ),
- •
  - γ-ray mixing ratios σ,
- •
  - lifetimes γ_m or widths Λ,
- •
  - neutron, proton, or α-particle resonances,
- •
  - partial widths,
- •
  - single-nucleon transfer reactions,
- •
  - beta-decay,
- •
  - arguments for spin and parity (J^π) and isospin (T) assignments.
For each nuclide a master table summarizing the “best” or adopted values for E_x, J^π; T and τ_m or Λ precedes the auxiliary tables listed above.
The review of each A-chain concludes with a discussion of isospin multiplets.
Figures are presented of the level schemes of all nuclei and, for each A-chain, an overview of the relative energies of the ground states and lowest analogue states of all nuclei in the chain.

View all citing articles on Scopus

^☆: Supported in part by the National Science Foundation [GP-28027].

View full text

Beta decay of 23Mg and 27Si☆

Abstract

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Phys. Lett.

Nucl. Phys.

Can. J. Phys.

Phys. Rev.

Beta decay of ²³Mg and ²⁷Si☆