43Ar and 44Ar

doi:10.1016/0375-9474(70)90401-X

Nuclear Physics A

Volume 151, Issue 3, 17 August 1970, Pages 634-640

https://doi.org/10.1016/0375-9474(70)90401-X Get rights and content

Abstract

The half-lives andγ-ray spectra of ⁴³Ar and ⁴⁴Ar have been measured. The first information on the half-life of ⁴³Ar was obtained using the reaction Ti(p, spallation)⁴³Ar and the isotope separator on-line facility (ISOLDE) at the CERN 600 MeV synchro-cyclotron. Precise measurements of the half-lives and γ-ray energies, and also of the relative γ-ray intensities were made on samples produced by the reaction V(p, spallation) ^43,44Ar with 600 MeV protons followed by mass separation in the CERN off-line isotope separator. The half-life of ⁴³Ar is 5.37 ± 0.06 min, and that of ⁴⁴Ar is 11.87 ± 0.05 min. The γ-speetrum accompanying the decav of ⁴³Ar is complex; 18γ-rays were found. The γ-spectrum accompanying ⁴⁴Ar decay has only five γ-rays. Partial decay schemes for ⁴³Ar and ⁴⁴Ar are presented.

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Cited by (18)

Nuclear Structure and Decay Data for A=44 Isobars
2023, Nuclear Data Sheets
Experimental nuclear spectroscopic data are evaluated for 12 known nuclides of mass number A=44 (Si, P, S, Cl, Ar, K, Ca, Sc, Ti, V, Cr, Mn). Detailed evaluated information are presented for each reaction and decay. Recommended values combining all available data are provided for all spectroscopic properties of each level, γ-ray, and decay radiation. No excited states have yet been identified in ⁴⁴Si, ⁴⁴P, ⁴⁴Cr, and ⁴⁴Mn. Information for excited states in ⁴⁴Cl and ⁴⁴V are limited. Nuclides of ⁴⁴S, ⁴⁴Ar and ⁴⁴K have been studied via only a few reactions and decays, while ⁴⁴Ca, ⁴⁴Sc and ⁴⁴Ti are the most investigated nuclides through various reactions and decays. Evaluators note that the half-life of the g.s. of ⁴⁴S has been measured independently, with fairly good statistics, in three references, most precise being 100 ms 1 by 2004Gr20, but this value is in disagreement with the values of 125.5 ms 25 and 119 ms 6 by 2022Tr03, and 123 ms 10 by 1995So03. We adopted the unweighted average of this discrepant dataset. Another outstanding issue is that of the β⁺-delayed proton decay of ⁴⁴Cr g.s. to ⁴⁴V, where the T=2, 0⁺ IAS state in ⁴⁴V is expected to be strongly populated by a superallowed β transition, but has not been definitely identified as discussed in detail by 2020Fu05. A detailed study of ⁴⁴Cr decay is required to unravel the status of the T=2, 0⁺ IAS state in ⁴⁴V. This work supersedes earlier ENSDF evaluations of A=44 by 2011Ch39 and 1999Ca45.
Nuclear Data Sheets for A = 43
2015, Nuclear Data Sheets
The experimental data are evaluated for known nuclides of mass number A = 43 (Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti,V,Cr). Detailed evaluated level properties and related information are presented, including adopted values of level and γ–ray energies, decay data (energies, intensities and placement of radiations), and other spectroscopic data. This work supersedes earlier full evaluations of A = 43 published by 2001Ca24 and 1990En08 (also 1978En04, and 1998En04 update).
No excited states are known in ⁴³Al, ⁴³Si and ⁴³Cr. Only one excited state is known in ⁴³V which is the probable the Isobaric Analog State (IAS) of ⁴³Cr ground state. Information for ⁴³P, ⁴³S, ⁴³Cl, ⁴³Ar and ⁴³Ti is limited; there is either no decay data available or the decay schemes are incomplete in view of large Q values and known excitations much lower than allowed by Q values. The ⁴³K, ⁴³Ca and ⁴³Sc nuclides remain the most extensively studied from many different reactions and decays.
Nuclear Data Sheets for A = 44
2011, Nuclear Data Sheets
The experimental data are evaluated for known nuclides of mass number A=44 (Si,P,S,Cl,Ar,K,Ca,Sc,Ti,V, Cr,Mn). Detailed evaluated level properties and related information are presented, including adopted values of level and γ-ray energies, decay data (energies, intensities and placement of radiations), and other spectroscopic data. This work supersedes earlier full evaluations of A=44 published by 1999Ca45 and 1990En08 (also 1998En04 update).
No excited states are known in ⁴⁴Si, ⁴⁴P, ⁴⁴Cr, ⁴⁴Mn. Only one excited state is known in 44V and its Isobaric Analog State (IAS) has been observed but with the level energy not known. Information for ⁴⁴S, ⁴⁴Cl and ⁴⁴Ar is limited and their radioactive decay schemes seem incomplete in view of large Q values and known excitations much below than allowed by Q values. The ⁴⁴Ca, ⁴⁴Sc and ⁴⁴Ti nuclides remain as the most extensively studied from many different reactions and decays.
Nuclear data sheets for A = 43
2001, Nuclear Data Sheets
Nuclear data sheets for A = 44
1999, Nuclear Data Sheets
Nuclear spectroscopic information for the known nuclides of mass 44 (P,S,Cl,Ar,K,Ca,Sc,Ti,V,Mn,Cr) has been evaluated. The principal sources of the adopted levels presented are the evaluations of P. Endt (1999En08,1998En04,1978En02). The data sets for reactions and decays, including all available gamma-ray data, are based mostly on original literature. Recent high-spin and (⁶Li,d) data for ⁴⁴Ti and new measurements of half-life of ⁴⁴Ti are incorporated.
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.

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^†: On leave from Brookhaven National Laboratory, Upton, New York, USA. Work partially supported by the US Atomic Energy Commission.

^††: Present address: Department of Chemistry, University of Oslo, Blindern, Norway.

View full text

43Ar and 44Ar

Abstract

Phys. Lett.

Nucl. Instr.

Nucl. Instr.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Brookhaven nat. lab. rep. BNL 846

Goddard Institute for Space Studies Report

⁴³Ar and ⁴⁴Ar