Charged particle decay of hole states in 16O

doi:10.1016/0370-2693(80)90206-3

Physics Letters B

Volume 96, Issues 1–2, 20 October 1980, Pages 35-38

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Abstract

Branching ratios for proton and α-particle decay of hole states in ¹⁶O have been determined from a ¹⁷O(d, tc) coincidence experiment. Total widths have been measured in s supplementary ¹⁷O(³He, α)¹⁶O experiment. Proton decay of stretched d_5/2 · p_3/2⁻ states to the p_1/2⁻ ground state of ¹⁵N is interpreted in terms of a nuclear Auger effect.

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A model for particle emission induced by electron scattering
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A model for the description of particle emission after electro-excitation of a nucleus is developed. The coupling between the individual decay channels is treated within the framework of the continuum random-phase approximation. The interference terms between charge and current operators as well as the interference term between the two different transverse components of the current operator are included in the calculation. The model is applied to the proton decay of ¹⁶O. The sensitivity of the angular distribution of the emitted particle to the presence of weak multipole strengths is analysed and signatures for monopole strength are discussed. Coincidence experiments are shown to be a selective tool to excite bound states embedded in the continuum. Quasi-free knock-out is found to start immediately above the giant-dipole-resonance region.
Spectroscopy of intermediate 16F states with the reaction 14N(3He, np)15O
1985, Nuclear Physics, Section A
Excited states of ¹⁶F have been investigated with the reaction ¹⁴N(³He, np)¹⁵O at E = 10.5 and 12 MeV in kinematically complete experiments. Proton groups corresponding to the decays of intermediate ¹⁶F states were observed at various angles with counter telescopes in time coincidence with the associated neutrons detected at θ_n^lab = 0° with a time-of-flight spectrometer. Excitation energies and decay widths Γ_p0 of these states have been extracted from the proton spectra. Lower limits for the orbital angular momentum in the decay channel and for the spin of the states have been deduced from the obtained angular correlations. By comparison with the reaction ¹⁴N(³He, pp)¹⁵N measured at E = 13 MeV, pairs of $T = 1^{16} F$ parent/¹⁶O analog states have been identified. J^π assignments and shell-model configurations are discussed on the basis of the selectivity of the reactions measured.
15N(p, po)15N and the levels of 16O for E<inf>x</inf> = 14.8-18.6 MeV
1984, Nuclear Physics, Section A
Angular distributions of cross section and analyzing power for elastic scattering of protons from ¹⁵N have been measured for E_p = 2.7–7.0 MeV. A phase-shift analysis of the data yields spin-parity assignments and level parameters for seventeen states of ¹⁶O in the excitation energy region 14.8–18.6MeV. Three of the resonances have not previously been identified, among them being a broad J^π = 2⁻ level at E_p = 6.1 MeV which is almost certainly the analog of the 2⁻ 1p1h state with configuration ( $d_{32}, p_{12}^{−1}$ ) at E_x ∽ 5.0 MeV in ¹⁶N. The broad level previously reported near E_p = 5.0 MeV has been observed and its parameters determined. A resonance analysis of the phase shifts yielded values of E_r, Γ and Γ_p for all of the levels. The J^π assignments are in agreement with previously reported values. For resonances having J = l, the data can usually be fit with a resonant phase shift corresponding to either J = l + 1 or J = l − 1, in addition to the phase shift for J = l. Which of the two spurious-J solutions occurs seems to depend on whether the partial wave through which the resonant state is formed is $J = l + 12 or J = l − 12$ .
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^☆: Work supported in part by Gesellschaft für Kernforschung, GmbH, Karlsruhe, West Germany.

¹: Present address: HEPL, Stanford University, Stanford, CA 94305, USA.

²: Present address: IEKP, Kernforschungszentrum, 7500 Karlsruhe, West Germany.

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Physics Letters B

Abstract

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Cited by (7)

A model for particle emission induced by electron scattering

Spectroscopy of intermediate <sup>16</sup>F states with the reaction <sup>14</sup>N(<sup>3</sup>He, np)<sup>15</sup>O

<sup>15</sup>N(p, po)<sup>15</sup>N and the levels of <sup>16</sup>O for E<inf>x</inf> = 14.8-18.6 MeV

Configurations of particle-hole states in <sup>16</sup>O

M4 RESONANCES IN LIGHT NUCLEI STUDIED AT CCB

O17(d,t)16O at 89 MeV; j dependence and particle-hole matrix elements

Charged particle decay of hole states in 16O☆

Abstract

Phys. Lett.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Charged particle decay of hole states in ¹⁶O☆