The 124-131Te nuclei have been produced as fission fragments in two fusion reactions induced by heavy ions ( 12C + 238U at 90MeV bombarding energy and 18O + 208Pb at 85MeV) and studied with the Euroball array. Their high-spin level schemes have been extended up to 6MeV (even-A and 5MeV (odd-A excitation energies from the triple $ \gamma$
 -ray coincidence data. The $ \gamma$
 -
 $ \gamma$
 angular correlations have been analyzed in order to assign spin and parity values to most of the observed states. Moreover the half-lives of isomeric states have been measured from the delayed coincidences between the fission-fragment detector SAPhIR and Euroball, as well as from the timing information of the Ge detectors. The behaviors of the yrast structures identified in the present work are first discussed in comparison with the general features known in the mass region, particularly the breakings of neutron pairs occupying the $ \nu$
 h
 11/2 orbit identified in the neighboring Sn nuclei. The experimental level schemes are then compared to shell-model calculations performed in this work. The analysis of the wave functions shows the effects of the proton-pair breaking along the yrast lines of the heavy Te isotopes.

High-spin structures of 124−131Te: Competition of proton- and neutron-pair breakings

Measurements of the $^{241}\mathrm{Am}$($n,2n$) reaction cross section have been performed at the Joint Research Centre (JRC) Geel in the frame of a collaboration between the European Commission (EC) JRC and French laboratories from CNRS and the Commissariat \`a L'Energie Atomique (CEA) Cadarache. Raw material coming from the Atalante facility of CEA Marcoule has been transformed by JRC Karlsruhe into suitable $^{241}\mathrm{Am}$O${}_{2}$ samples embedded in Al${}_{2}$O${}_{3}$ matrices specifically designed for these measurements. The irradiations were carried out at the $7$-MV Van de Graaff accelerator. The $^{241}\mathrm{Am}$($n,2n$) reaction cross section was determined relative to the $^{27}\mathrm{Al}$($n,\ensuremath{\alpha}$)$^{24}\mathrm{Na}$ standard cross section. The measurements were performed in four sessions, using quasi-mono-energetic neutrons with energies ranging from $8$ to $21$ MeV produced via the $^{2}\mathrm{H}$($d,n$)$^{3}\mathrm{He}$ and the $^{3}\mathrm{H}$($d,n$)$^{4}\mathrm{He}$ reactions. The induced activity was measured by standard $\ensuremath{\gamma}$-ray spectrometry using a high-purity germanium detector. Below $15$ MeV, the present results are in agreement with data obtained earlier. Above 15 MeV, these measurements allowed the experimental investigation of the $^{241}\mathrm{Am}$($n,2n$) reaction cross section for the first time. The present data are in good agreement with predictions obtained with the talys code that uses an optical and fission model developed at CEA.

High Resolution Measurements of the 241Am(n,2n) Reaction Cross Section

The decay of 123Ba to 123Cs has been studied with mass-separated sources. Singles spectra of γ-rays, X-rays and conversion electrons as well as γ - γ - t, γ - e
 − - t, and X - e
 − - t coincidences were recorded. A level scheme of 123Cs has been constructed including 26 new excited states and 82 transitions. The existence of a I
 π
 = 11/2−, T
 1/2 = 1.7 s isomer, bandhead of the h
 11/2 band, is confirmed. Its excitation energy equals 156.3 keV. A new T
 1/2 = 114 ns isomer has been established at 232 keV using the in-beam recoil catcher technique. It is assigned to the I
 π
 = 9/2+ bandhead of the gpg
 9/2 band. Collective bands based on the 1/2+ ground state and first 3/2+ excited state are proposed. The level structure is described in the frame of the interacting boson-fermion and core-quasiparticle coupling models.

Level structure of 123Cs observed from 123Ba decay and described using the IBFM and CQPC models

The quadrupole moments of three decoupled bands in the odd-odd nuclei {sup 130}Pr and {sup 132}Pr were measured using the Doppler shift attenuation method in the bombardment of {sup 105}Pd with {sup 35}Cl at 173 MeV. The {pi}h{sub 11/2}{circle_times}{nu}(f{sub 7/2},h{sub 9/2}) configuration was assigned to these structures on the basis of the observed in-band properties and relative deformations. New information is presented on the shape-driving behavior of the 1/2{sup {minus}}[541] (f{sub 7/2},h{sub 9/2}) intruder neutron orbital, whose involvement in a particular configuration leads to quadrupole deformation values which are intermediate between those known for normally deformed and so-called superdeformed bands in this mass region. {copyright} {ital 1999} {ital The American Physical Society}

Relative quadrupole deformations for decoupled structures in the odd-odd {sup 130}Pr and {sup 132}Pr nuclei

The structure of odd-mass isotopes of Cs and Xe is described in the framework of the proton-neutron interacting boson-fermion model. The model provides a consistent description of $\ensuremath{\beta}$ decay from Cs to Xe nuclei of mass number $A=125,$ 127, and 129.

β decay of odd- A Cs isotopes in the interacting boson-fermion model

Regular ArticleNuclear Data Sheets for A = 129

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Regular ArticleNuclear Data Sheets for A = 129