Spectroscopy of 41K by thermal neutron capture in 40K

doi:10.1016/0375-9474(84)90506-2

Nuclear Physics A

Volume 417, Issue 2, 9 April 1984, Pages 231-255

https://doi.org/10.1016/0375-9474(84)90506-2 Get rights and content

Abstract

The γ-ray spectrum emitted after thermal neutron capture in ⁴⁰K has been studied at the ILL high flux reactor with curved crystal Bragg, pair and Ge(Li) spectometers. 585 transitions were assigned to the reaction ⁴⁰K(n, γ)⁴¹K and 490 of them were placed into a ⁴¹K level scheme; 68 new states are proposed. On the basis of γ-ray branches to states with established spin and parity, many new spin-parity assignments were made. The level energies up to 4 MeV were measured with a precision of 8–50 eV relative to the 411.8 keV ¹⁹⁸Au standard, those above 4 MeV with a precision of 50–100 eV. The spin of the capture state was found to be $I = 72$ ; the neutron binding energy was determined to E_B = 10095.25(10) keV. The level density of $I^{π} = 52^{±}, 72^{±}, 92^{±}$ states was analyzed in terms of the constant-temperature Fermi gas model. It was shown that in this spin window the level scheme is almost complete up to an excitation energy of 5 MeV.

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Nuclear Data Sheets for A = 41
2016, Nuclear Data Sheets
Available information pertaining to the nuclear structure of all nuclei with mass numbers A=41 ranging from Al (Z=13) to Ti (Z=22) are presented. The experimental reaction and decay data are evaluated and any inconsistencies or discrepancies are noted. The adopted values for various level properties (such as the spin, parity and and halflife) and gamma properties (energy, intensity and multipole character) are given.
Since the prior evaluation several new measurements have expanded our knowledge of A=41 nuclides. The half-life of the ground state of ⁴¹Si has been determined and a single excited state identified. Excited levels in ⁴¹P have been observed for the first time. In ⁴¹Cl, seven new excited states have been identified in deep inelastic and heavy ion transfer reactions. Half-lifes for four states in ⁴¹Ar have been updated and additional levels with gammas have been included from a new measurement using the multiple ion transfer reaction. In ⁴¹Ca via charge-exchange reaction measurements, several new excited states were observed. A number of new resonances in ⁴¹K have been identified via the (p,γ) reaction.
There remains a significant discrepancy in the half-life of the first excited state (980 keV) in ⁴¹K, with measurements differing by more than an order of magnitude. Transfer reactions suggest that this M1 transition should be l-forbidden, however, several measurements yield a lifetime which suggests a sizable M1 strength. Further measurements to resolve the current conflicts would be beneficial.
Prompt gamma rays from radiative capture of thermal neutrons by elements from hydrogen through zinc
2002, Atomic Data and Nuclear Data Tables
The energies and intensities of prompt gamma rays produced by the radiative capture of thermal neutrons have been compiled and evaluated for elements with atomic numbers Z=1–30. These elements are important for many applications, including well logging, planetary remote sensing, and other analytic and diagnostic applications. Experimental data for 70 isotopes from ¹H to ⁶⁸Zn were compiled and evaluated. Published thermal-capture cross sections were used to convert the isotopic gamma-ray intensities to elemental intensities. The evaluated energies and absolute intensities of these capture gamma rays are presented by element and a subset is sorted by gamma-ray energy. The literature has been covered to August 2000.
Nuclear data sheets for A = 41
2001, Nuclear Data Sheets
Nuclear spectroscopic information for the known nuclides of mass 41 (Al,Si,P,S,Cl,Ar,K,Ca,Sc,Ti) has been evaluated. The principal sources of the adopted levels presented are Endt's 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 41 Al, 41 Si, 41 P, 41 Cl and 41 Ti.
Complete spectroscopy of 90Y via the 89Y(n, γ) and 89Y(d, p) reactions
1993, Nuclear Physics, Section A
The γ-ray spectrum emitted after thermal-neutron capture in ⁸⁹Y was studied at the ILL high-flux reactor using a pair and Compton suppressed germanium detector. A total of 893 transitions were assigned to the decay of ⁹⁰Y, 392 of which, representing more than 90% of the obtained flux, were placed in a level scheme of sixty states. The neutron binding energy of ⁹⁰Y was determined as 6857.02 (17) keV. The reaction ⁸⁹Y( $d$ , p) was studied using a 22 MeV vector-polarized deuteron beam and the Munich Q3D spectrometer. Angular distributions of the vector-analyzing power and differential cross section for nearly all states up to 5 MeV excitation were taken and analyzed within the DWBA formalism. For some eighty states the transferred total and orbital angular momenta, spectroscopic factors and spins were deduced. The results of both measurements are compared and discussed in the scope of the statistical model, the shell model and the quasiparticle RPA-model.
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),
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  - γ-ray mixing ratios σ,
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  - lifetimes γ_m or widths Λ,
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  - neutron, proton, or α-particle resonances,
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  - partial widths,
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  - single-nucleon transfer reactions,
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  - beta-decay,
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  - 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.
High-resolution spectroscopy of 32P. (II). Level density and primary transition strengths observed after thermal neutron capture in 31P
1989, Nuclear Physics, Section A
The -γ-ray spectrum emitted after thermal neutron capture in ³¹P was studied at the ILL high flux reactor with a pair spectrometer and an intrinsic Ge detector. A total of 212 transitions were assigned to the decay of ³²P and 155 of these, representing 96.7% of the observed flux, were placed in a level scheme of 38 states. The neutron binding energy was determined as 7935.74 (16) keV. The densities of states observed in this reaction and in a recent (d, p) study are analyzed in the constant temperature Fermi-gas model. The primary E1 and M1 transition strengths in ³²P are discussed and are compared to other sd-shell nuclei.

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^☆: Supported by Deutsches Bundesministerium für Forschung und Technologie.

^†: Present address: Centre d'Etudes Nucléaires, Bordeaux-Gradignan, France.

^††: Present address: Brookhaven National Laboratory, Upton, NY, USA.

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Nuclear Physics A

Abstract

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Nuclear Data Sheets for A = 41

Prompt gamma rays from radiative capture of thermal neutrons by elements from hydrogen through zinc

Nuclear data sheets for A = 41

Complete spectroscopy of <sup>90</sup>Y via the <sup>89</sup>Y(n, γ) and <sup>89</sup>Y(d, p) reactions

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

High-resolution spectroscopy of <sup>32</sup>P. (II). Level density and primary transition strengths observed after thermal neutron capture in <sup>31</sup>P

Spectroscopy of 41K by thermal neutron capture in 40K☆

Abstract

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Spectroscopy of ⁴¹K by thermal neutron capture in ⁴⁰K☆