Mean lifetime of the 8.88 MeV state in 16O

doi:10.1016/0375-9474(67)90460-5

Nuclear Physics A

Volume 91, Issue 1, January 1967, Pages 177-198

https://doi.org/10.1016/0375-9474(67)90460-5 Get rights and content

Abstract

The mean life of the 8.88 MeV state in ¹⁶O has been measured using the particle-gamma coincidence form of the Doppler-shift-attenuation method. The value obtained is (1.92±0.29) × 10⁻¹³ sec. Detailed calculations relating to the Doppler-shift measurement were made for the stopping and scattering of the ¹⁶O recoil nuclei in the target and backing material. The partial widths of the gamma-ray transitions determined from the present mean-life measurement and the branching and mixing ratios known from other experiments were compared with the predictions of the independent particle model. Experimental B(E2) values were compared to the calculated B(E2) on the assumption that the 8.88 MeV state forms part of a K = 1 rotational band.

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On the inelastic excitation of 2- state of 16O by α particles
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The spectroscopy of 54Fe via the reaction 54Fe(p, p'γ)54Fe at 10 MeV
1972, Nuclear Physics, Section A
In the ⁵⁴Fe(p, p'γ)⁵⁴Fe reaction at 10 MeV, angular correlations of gamma rays coincident with protons detected near 180°, have been measured. From an analysis of the angular correlations, unambiguous spin assignments have been made for the 3.345(3), 4.074(3), 4.579(2), 4.781(3), and 4.949(4) MeV states. Model-dependent spin assignments have been made for several other states. The angular correlation analysis also yielded multipole mixing ratios for many transitions and branching ratios for the decay of all states of ⁵⁴Fe below 5 MeV. From the same data, an analysis of the Doppler shifts of the coincident gamma rays allowed determination of the lifetimes of the 1.409, 2.959, 3.164, 3.836, 4.048, 4.074, 4.265, 4.287, 4.781 and 4.949 MeV states. Utilizing all the measured quantities, estimates have been of the strengths of 20 E2, 9 M1, and 4 E1 transitions. To aid in understanding the nature of the observed levels, the po- sitions of various np-mh states have been estimated using a monopole residual interaction. It is found that 2p-4h states as well as lp-3h states may occur at low excitation energies. The 2.540 MeV (O₂⁺) state is probably of the configuration 2p-4h. The decay properties of all states below 3.5 MeV are compared to the predictions of theoretical calculations in which lp-3h proton ( $2 p_{32} and 1 f_{52}$ ) excitations were considered.
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^†: Present address: Physik-Institut der Universität Zürich, Switzerland.

^††: Present address:Michigan State University,East Lancing,Michigan.

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Nuclear Physics A

Abstract

References (22)

Phil. Mag.

Revs. Mod. Phys.

Proc. Roy. Soc.

Proc. Phys. Soc.

Mat. Fys. Medd. Dan. Vid. Selsk.

Phys. Rev.

Mat. Fys. Medd. Dan. Vid. Selsk.

Mat. Fys. Medd. Dan. Vid. Selsk.

Mat. Fys. Medd. Dan. Vid. Selsk.

Phys. Rev.

Cited by (7)

On the inelastic excitation of 2<sup>-</sup> state of <sup>16</sup>O by α particles

The spectroscopy of <sup>54</sup>Fe via the reaction <sup>54</sup>Fe(p, p'γ)<sup>54</sup>Fe at 10 MeV

Lifetime measurements in <sup>16</sup>O

Cross sections for production of the 15.10-MeV and other astrophysically significant gamma-ray lines through excitation and spallation of C12 and O16 with protons

Two-Step Analysis of the O18(p, A)

Mean lifetime of the unnatural parity states in<sup>16</sup>O