The T&gt; GDR and the characteristic decay mode by the (e, p) reaction on 139La and 141Pr

doi:10.1016/0375-9474(80)90365-6

Nuclear Physics A

Volume 341, Issue 1, 26 May 1980, Pages 125-136

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Abstract

The cross sections and the proton energy distributions of the (e, p) reactions on ¹³⁹La and ¹⁴¹Pr have been measured around the T_> GDR. The energies of the T_> GDR have been given as E_R = 21.0 MeV in ¹³⁹La and E_R = 20.4 MeV in ¹⁴¹Pr. The decay protons of the T_> GDR have been studied. The proton groups which leave the residual nucleus in the neutron particle-hole states have been clearly seen in the same energy regions as the decay protons emitted through the low-lying IAR.

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Cited by (7)

Nuclear Data Sheets for A=141
2023, Nuclear Data Sheets
The experimental results published before August 2022 from the various reaction and decay studies leading to nuclides of Z=51 to Z=67, ¹⁴¹Sb, ¹⁴¹Te, ¹⁴¹I, ¹⁴¹Xe, ¹⁴¹Cs, ¹⁴¹Ba, ¹⁴¹La, ¹⁴¹Ce, ¹⁴¹Pr, ¹⁴¹Nd, ¹⁴¹Pm, ¹⁴¹Sm, ¹⁴¹Eu, ¹⁴¹Gd, ¹⁴¹Tb, ¹⁴¹Dy, ¹⁴¹Ho in the A=141 mass chain have been reviewed and the data are presented together with adopted level schemes and properties. This work supersedes the previous evaluation of the A=141 nuclides by published by N. Nica in Nuclear Data Sheets 122, 1 (2014).
Nuclear Data Sheets for A = 141
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The (γ,p) reaction in <sup>197</sup>Au
2001, Nuclear Physics A
Proton energy spectra of the ¹⁹⁷Au $(e,p)$ reaction were measured in the region between 17 and 30 MeV at three angles: 40°, 90° and 140°. Two prominent bumps were observed in the $(γ,p)$ spectra converted using virtual photon theory. The higher-energy bump shifts with photon energies and the lower-energy one stays at 10.5 MeV. The higher-energy bump is much larger at 40° than at 140°; on the contrary the angular dependence of the lower-energy bump is small. Neither bump can be described by a statistical calculation. A calculation of a microscopic shell model shows that the lower-energy bump is attributed to the decay of proton-particle–neutron-hole pairs in the $T_{>}$ states, leaving a neutron hole around the Fermi surface. The higher-energy bump can be ascribed to the direct–semidirect mechanism. This paper gives the solution to a part of the long-standing question about the origin of photo-proton emission in heavy nuclei.
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^†: Present address: Saskatchewan Accelerator Laboratory, University of Saskatchewan, Saskatoon, Saskatchewan, Canada S7N0W0.

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The T> GDR and the characteristic decay mode by the (e, p) reaction on 139La and 141Pr

Abstract

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Nucl. Phys.

Phys. Rev.

Phys. Rev.

Phys. Rev.

Can. J. Phys.

The T_> GDR and the characteristic decay mode by the (e, p) reaction on ¹³⁹La and ¹⁴¹Pr