Resonant gamma-ray absorption in 208Pb

doi:10.1016/0375-9474(76)90492-9

Nuclear Physics A

Volume 259, Issue 1, 8 March 1976, Pages 13-19

https://doi.org/10.1016/0375-9474(76)90492-9 Get rights and content

Abstract

The level at 7064.3 ± 0.5 KeV in ²⁰⁸Pb has been excited in a resonant absorption experiment by Doppler shifted γ-radiation from the ³⁴S(p, γ)³⁵Cl reaction at E_p = 1974 keV. Analysis of the absorption integral gives Γ = 18 ± 3 eV for the level width, assuming a 100 % ground state branch. The suitability of this technique for measuring lifetimes of nuclear bound states in the attosecond range is discussed.

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Cited by (13)

Nuclear Data Sheets for A = 208
2007, Nuclear Data Sheets
Detailed level schemes, decay schemes, and the experimental data on which they are based are presented for all nuclei with mass number A = 208. The experimental data are evaluated; inconsistencies and discrepancies are noted; and adopted values for level and γ-ray energies, γ intensities, as well as for other nuclear properties are given. This evaluation replaces the A = 208 evaluation published by M.J. Martin in Nuclear Data Sheets 47, 797 (1986).
Resonant absorption and the isospin mixing of the second T = 3 2 state of 9Be
1987, Nuclear Physics, Section A
The second $T = 32$ state of ⁹Be at E_x = 16.98 MeV, a narrow state amidst many broad $T = 12$ states, was resonantly excited in the reaction ⁹Be(γ, X) with monoenergetic γ rays of variable energy produced in the ⁷Li(d, γ)⁹Be reaction at E_d = 361 keV. Analyses of the transmission dips, measured with ⁹Be absorbers of lengths ranging from L = 80 to 488 mm, yield a total width of Γ = 520 ± 90 eV and a radiative width of Γ_γ0 = 16.6 ± 1.2 eV. Measurements of thick-target yield curves of the ⁷Li(d, γ)⁹Be resonance at E_d = 361 keV yield a total width Γ = 470 ± 60 eV for the same level and a resonance strength S = 7.6 ± l.3 eV. These results, together with literature data, give information on the isospin mixing of this highly excited $T = 32^{9} Be$ state.
Nuclear Data Sheets for A = 208
1986, Nuclear Data Sheets
Resonant-absorption measurements of attosecond lifetimes
1985, Nuclear Physics, Section A
The resonance gamma-ray absorption method
1978, Nuclear Instruments and Methods
It has recently been demonstrated that resonance absorption of γ-rays from the (p, γ) reaction can be used as a general tool for measuring widths of nuclear states. The present paper reviews the γ-ray transitions suitable for such measurements. A list of 500 γ-rays has been compiled, which shows that for practically any level within the energy range from 6 to 10 MeV a matching γ-ray is available.
An investigation of the limits of applicability of the method shows that widths of bound states can be routinely measured in nuclei with A⩽40 for allowed E1 ground-state transitions of average strength as well as for most M1 and E2 ground-state transitions. For heavier nuclei the applicability of the method is restricted to widths larger than the average. Graphs are presented which facilitate the calculation of the absorption integral for a wide range of parameters.
Investigation of the reaction 34S(p, γ)35Cl. (II). Angular distributions and resonant absorption
1976, Nuclear Physics, Section A
Angular distributions have been measured at four ³⁴S(p, γ)³⁵Cl resonances, at E_x = 8.63, 8.64, 8.95 and 9.08 MeV, giving spin-parity assignments $J^{π} = 72^{−}, (32, 52), 32^{+} and 52$ , respectively. Spins and parities have been determined for bound states at E_x = 3.92, 4.11, 4.85 and 5.16 MeV, as $J^{π} = 32^{+}, 72^{+}, (12, 32), 72^{−}$ , respectively. Branching and mixing ratios have been obtained for the decay of the states at E_x = 3.92, 4.11, 4.35 and 5.16 MeV. Transition strengths are presented for the first three of these. Comparison of the experimental data with published intermediate-coupling and shell-model calculations provides information on the configurations of the E_x = 3.92,4.11 and 5.16 MeV levels. A resonant absorption experiment at the E_p = 2.79 MeV resonance gives for the resonance width Γ = 65 ± 20 eV, and also determines the partial widths Γ_γ, Γ_p and Γ_p₁. This experiment supports recent absolute yield measurements of the strength of the $J^{π} = 72^{−}, E_{p} = 1.21 MeV$ resonance.

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^†: On leave from Institute of Nuclear Sciences, DSIR, New Zealand.

^††: On sabbatical leave from Brooklyn College of CUNY, New York, USA.

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Nuclear Physics A

Abstract

References (14)

Physica

Rev. Mod. Phys.

Phys. Lett.

Phys. Rev.

Phys. Rev.

Phys. Rev.

Phys. Rev.

Cited by (13)

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Resonant absorption and the isospin mixing of the second T = 3 2 state of <sup>9</sup>Be

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