Isobaric analogue resonances in proton scattering on 138Ba

doi:10.1016/0375-9474(70)90587-7

Nuclear Physics A

Volume 140, Issue 3, 19 January 1970, Pages 673-687

https://doi.org/10.1016/0375-9474(70)90587-7 Get rights and content

Abstract

Extensive experimental data for the resonance scatttering of protons to the ground state and first excited state in ¹³⁸Ba are presented. A Breit Wigner analysis with a background term of the form $Σ_{n} (a_{n} E^{n})$ is performed and the extracted background function is compared with optical-model calculations using the parameters given in a detailed investigation by Perey. Neutron spectroscopic factors calculated in different ways from this data are compared with the corresponding factors from (d, p). An accurate determination of resonance energies for the first two resonances reveals a deviation from a constant Coulomb shift of the order of 10 keV.

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Cited by (24)

Nuclear Data Sheets for A=138
2017, Nuclear Data Sheets
Experimental nuclear structure data from various reactions and decays are compiled and evaluated for all known nuclides with mass number A=138 (Sn,Sb,Te,I,Xe,Cs,Ba,La,Ce,Pr,Nd,Pm,Sm,Eu,Gd,Tb). Detailed evaluated nuclear structure information is presented for each reaction and decay and the best values combining all available data are recommended for level energies, half-lives, γ-ray energies and intensities, decay properties (energies, intensities and placement of radiations), and other spectroscopic properties. This work supersedes the previous full evaluation of A=138 by A.A. Sonzogni (2003So13).
Nuclear Data Sheets for A = 139
2016, Nuclear Data Sheets
The experimental nuclear spectroscopic data for known nuclides of mass number 139 (Sn, Sb, Te, I, Xe, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy) have been evaluated and presented together with adopted properties for levels and gamma rays. This evaluation represents a revision of previous one (2001Bu16) by T.W. Burrows. Since then extensive new data have become available for many A=139 nuclides although, no excited state data are yet available for ¹³⁹Sn, ¹³⁹Sb, ¹³⁹Tb, and ¹³⁹Dy. The decay schemes of ¹³⁹Sn, ¹³⁹Sb, ¹³⁹I, ¹³⁹Tb and ¹³⁹Dy nuclei are not known, and those for ¹³⁹Gd and ¹³⁹Eu are poorly known. Particle-transfer data are available for ¹³⁹Ba, ¹³⁹La, ¹³⁹Ce and ¹³⁹Pr. Limited high-spin data are available for ¹³⁹Te, ¹³⁹I, ¹³⁹Cs, ¹³⁹Ba, ¹³⁹La and ¹³⁹Ce, while such data are extensive for ¹³⁹Pr, ¹³⁹Nd, ¹³⁹Pm, ¹³⁹Sm, ¹³⁹Eu and ¹³⁹Gd. Recent ¹³⁹Pm high-spin data from two independent studies using the same reaction and similar beam energy are in conflict and could be improved using state-of-the-art large gamma-detector arrays in contrast to the smaller arrays currently used. Cases for which no new experimental information are available since the last update have undergone checking resulting in some changes in the current work, but for the most part these are taken from the previous evaluations. Thus, the present work has greatly benefited from all prior NDS evaluations (2001Bu16, 1989Bu12, 1981Pe04, 1974Gr46), but at the same time data presented herein supersede those in the earlier evaluations.
Compound nucleus X-ray production across a nuclear resonance in the p + 134Ba reaction
1991, Nuclear Inst. and Methods in Physics Research, B
The probability of compound nucleus (CN) and separated atom (SA) X-ray emission in p + ¹³⁴Ba collisions has been measured as a function of proton energy near the isobaric analog nuclear resonance at 9.295 MeV. X-ray spectra were recorded in coincidence with protons scattered to a mean laboratory angle of 172° and detected by a cooled surface barrier detector which resolved elastically scattered protons from those which ionized one of the target's inner-shell electrons. Our results at five proton energies show good agreement for the predicted K-shell ionization probability (P_K) in the vicinity of this nuclear resonance. The measured ratio of CN to SA K_α X-rays is less than 3% integrated over the same region. A slight enhancement of the CN X-ray yield is seen at the resonance energy, and we deduce an upper limit for the peak CN cross section of σ₀ < 4 mb/sr.
Highly accurate spreading width Γ↓ of isobaric analog states in 139La from 138Ba(p, p') using a two-level s-matrix resonance parametrization
1989, Nuclear Physics, Section A
The excitation functions of differential cross section and analyzing power for $^{138} Ba (p, p_{0})^{138} Ba$ and $^{138} Ba (p, p_{1})^{138} Ba^{2+}$ were measured in the energy range E_p = 9.4–12.4 MeV. Resonance and optical-model parameters were extracted from the data for the elastic channel in a simultaneous fitting procedure using a two-level many-channel S-matrix resonance parametrization. Inelastic resonance parameters were extracted with a standard single-level S-matrix parametrization. From the extracted parameters the spreading widths Γ^↓ of eleven resonances were determined ( $Γ^{↓} = (47 ± 2) keV)$ and compared to theoretical predictions using the giant isovector monopole resonance as mediator for the mixing.
Shell-optical approach to interpretation of the main relaxation parameters of analog resonances in medium and heavy nuclei
1986, Nuclear Physics, Section A
A quantitative interpretation of the main parameters in relaxation of isobaric analog resonances in medium and heavy closed-shell nuclei over a wide atomic mass region is given within the framework of the shell-optical model, with allowance for proton channel coupling. The dependence of the relaxation parameters on the model parameters is investigated. The importance of channel coupling is shown. The results of calculations are compared with the experimental data and with other theoretical approaches.
Nuclear data sheets for A = 139
1981, Nuclear Data Sheets

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Nuclear Physics A

Abstract

References (16)

Phys. Lett.

Nucl. Phys.

Rev. Mod. Phys.

Isobaric spin in nuclear physics

Computer codes for the analysis of analogue resonances

Technical report, MPI Heidelberg

Cited by (24)

Nuclear Data Sheets for A=138

Nuclear Data Sheets for A = 139

Compound nucleus X-ray production across a nuclear resonance in the p + <sup>134</sup>Ba reaction

Highly accurate spreading width Γ<sup>↓</sup> of isobaric analog states in <sup>139</sup>La from <sup>138</sup>Ba(p, p') using a two-level s-matrix resonance parametrization

Shell-optical approach to interpretation of the main relaxation parameters of analog resonances in medium and heavy nuclei

Nuclear data sheets for A = 139