Gamma-ray transition strengths in 34Cl

doi:10.1016/0375-9474(70)90705-0

Nuclear Physics A

Volume 149, Issue 2, 29 June 1970, Pages 411-417

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Abstract

Gamma-ray transitions in ³⁴Cl have been studied with p-γ coincidence measurements in the ³²S(τ, pγ)³⁴Cl reaction. A new level, at E_x = 2179.4 ± 1.4 keV has been found. From DSA measurements mean lives of τ_m = 940 ± 400, 46 ± 15, 400 ± 100 and 260 ± 75 fs were found for the ³⁴Cl levels at E_x = 1.89, 2.16, 2.18 and 2.38 MeV, respectively. Branchings are given for the three upper states. From the presently known information it is possible to identify the 2.16 MeV level with the 2⁺, T = 1 state expected in this region. Even parity can be deduced for the 0.46, 1.89 and 2.38 MeV levels.

The M1 and E2 strengths for a number of transitions in ³⁴Cl have been compared with calculations performed with many-particle shell-model wave functions.

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Cited by (23)

Nuclear Data Sheets for A = 34
2012, Nuclear Data Sheets
Nuclear spectroscopic information for experimentally investigated nuclides of mass 34 (Ne, Na, Mg, Al, Si, P, S, Cl, Ar, K, Ca) has been evaluated. The principal sources of the Adopted Levels presented for nuclides close to the stability line are Endtʼs evaluations (1990En08, 1978En02). The data sets for reactions and decays, including all available gamma–ray data, are based mostly on the original literature. There are no data available for the excited states in ³⁴Ne and ³⁴Na. The existence of the ³⁴K and ³⁴Ca nuclides has been searched and reported in a secondary publication but no evidence was found for their detection. Both nuclides are possible candidates for one or two–proton emission. Only upper limits of half–lives have been proposed based on expected cross sections. Decay schemes for the β decays of ³⁴Ne, ³⁴Na, ³⁴Mg, and ³⁴Si are not known. Very little information is available for β–delayed neutron decays of ³⁵Na, ³⁵Mg and ³⁵Si which lead to population of levels in A = 34 nuclides. Neutron–rich nuclides in this mass region are relevant to “island of inversion”.
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.
Short lifetimes in 34Cl
1985, Nuclear Physics, Section A
Mean lifetimes of levels in ³⁴Cl have been measured using the Doppler-shift-attenuation (DSA) method and the reaction ³³S(p, γ)³⁴Cl. The lifetime values or limits were determined for 35 bound levels below the excitation energy of 5.2 MeV; the lifetimes of 7 levels and upper limits of 5 levels are reported for the first time. For the effective stopping of recoils, the targets were prepared by implanting ³³S into Ta backings. The Monte Carlo method and the experimental stopping power were used in the DSA analysis.
Isoscalar E2 strengths in the A = 34 mass triplet
1984, Nuclear Physics, Section A
The mean lifetimes τ = 47 ± 5 and 7.5 ± 1.7 fs of the 2.16(J^π = 2₁⁺ T = 1) and 3.38(2₂⁺, 1) MeV states in ³⁴Cl(T_z = 0), respectively, have been measured using the Doppler-shift attenuation method and the reaction ³³S(p, γ)³⁴Cl The relative intensities of the isoscalar E2 transitions 2.16(2₁⁺, 1) → 0(0⁺, 1) and 3.38(2₂⁺ 1) → 0(0⁺, 1) MeV have been determined to be (16.3 ± 0.5)% and (2.1 ± 0.7)%, respectively. The transition strengths are compared with the analogue transitions in ³⁴S( T_z = +1) and ³⁴Ar(T_z = −1) as well as with theoretical 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.
Étude des états excités du noyau 34Cl. (I). Courbe d'excitation de la réaction 33S(p, γ)34Cl, énergies, rapports d'embranchement et vies moyennes des niveaux du 34Cl
1977, Nuclear Physics, Section A
Resonance energies and strengths are reported for forty-five ³³S(p, γ)³⁴Cl resonances in the range E_p = 1.0–2.0 MeV. Analysis of the γ-ray spectra by means of two Ge(Li) detectors leads to precise excitation energies of bound states and branching ratios of resonant levels and bound states. New bound levels are found. The reaction Q-value is 5140.3 ± 1.5 keV. Mean lives (or limits) of twelve bound states of ³⁴Cl have been obtained from DSA measurements at seven of the studied ³³S(p, γ)³⁴Cl resonances.

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^†: On leave of absence from Istituto di Fisica dell'Università and from I.N.F.N., Sezione di Padova, Padova, Italy.

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Nuclear Physics A

Abstract

References (10)

Phys. Lett.

Nucl. Phys.

Phys. Rev.

Nucl. Phys.

Cited by (23)

Nuclear Data Sheets for A = 34

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

Short lifetimes in <sup>34</sup>Cl

Isoscalar E2 strengths in the A = 34 mass triplet

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

Étude des états excités du noyau <sup>34</sup>Cl. (I). Courbe d'excitation de la réaction <sup>33</sup>S(p, γ)<sup>34</sup>Cl, énergies, rapports d'embranchement et vies moyennes des niveaux du <sup>34</sup>Cl