Single-particle and collective excitations in 124Te

doi:10.1016/0375-9474(91)90755-U

Nuclear Physics A

Volume 530, Issue 1, 29 July 1991, Pages 58-74

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Abstract

Low-lying excitations in ¹²⁴Te have been investigated using the ¹²²Sn(α, 2n) reaction at beam energies of 21 and 23 MeV. Standard in-beam spectroscopy techniques of excitation function, γγ-coincidence and γ-ray angular distribution measurements were used. A level scheme up to 3410 keV was constructed. Nine new γ-rays have been placed and definite spin-parity assignments were made to a number of new levels. Among the new states identified were possible 10⁺ and 8⁺ members of the ground-state quasiband. To test proposed collective properties, non-yrast states populated in this work are examined through their relative B(E2) values and mixing ratios. No evidence supporting the existence of strong intruder components has been found.

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Nuclear Data Sheets for A = 124
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Nuclear structure of 126 Te studied with the (n, γ) reaction
2003, Nuclear Physics A
The reaction ¹²⁵Te(n, γ)¹²⁶Te has been measured at the neutron source SINQ of the Paul-Scherrer-Institut, Villigen, Switzerland. About 350 γ transitions have been placed in an extensive level scheme of ¹²⁶Te with 83 levels, including many new ones. The neutron binding energy was determined to be 9113.69(8) keV. The thermal neutron capture cross section was found to be 1.09(17) barn. The level scheme is compared with IBM and particle–core coupling calculations.
Lifetime measurement in 124Te
2000, Nuclear Physics A
Lifetimes of nuclear levels in ¹²⁴Te have been measured by the $γ$ -ray induced Doppler broadening (GRID) technique using the GAMS4 crystal spectrometer at the Institut Laue Langevin, Grenoble. The new experimental data allow the determination of absolute transition rates. The results show that the structure of ¹²⁴Te is best described by a configuration mixing calculation in the framework of the IBM-2. Precise $γ$ -ray measurements confirm a $2^{+}$ – $3^{+}$ level doublet at 2039 keV with a spacing of 129 eV.
Study of 124Te by the 122Sn(α,2nγ) reaction and by the decay of 124I
1998, Nuclear Physics A
In-beam γ-ray spectroscopy and the decay of ¹²⁴I were used to study the nuclear structure of ¹²⁴Te. On the basis of γγ-coincidences, a level scheme was constructed with over 100 levels and 170 transitions. The use of excitation functions and angular distributions for the (α, 2n) reaction, and the log(ft) values for the decay, allowed spin assignments for a large number of the levels to be made. The resulting level scheme was interpreted in the framework of the interacting boson model and the particle-core coupling model.
Particle-hole excitations in the interacting boson model (II): The U(5)-O(6) coupling
1997, Nuclear Physics A
Particle-hole excitations leading to two coexisting systems in the same nucleus are studied in the framework of an extended interacting boson model (EIBM). We apply the group theoretical concepts of the EIBM, a version of the interacting boson model where a distinction is made between particle and hole bosons, to the particular case of two coexisting systems in the same nucleus exhibiting the U(5) regular and the O(6) intruder configuration. One can allow for such coexisting systems through K-symmetry breaking in the “vertical” classification of particle-hole excitations. Furthermore, the “horizontal” classification allows to test the concept of intruder analog multiplets. Besides the description of these “global” properties, mixing calculations between the coexisting systems illustrate the important effects of “local” perturbations. Detailed applications are given for nuclei in the region of the shell closure Z = 50.
Two-phonon J = 1 states in even-mass Te isotopes with A = 122-130
1997, Nuclear Physics A
Excited states of the nuclei ^122,126,130Te were populated via the (γ, γ′) reaction at endpoint energies of the bremsstrahlung between 4.5 and 5.5 MeV. Gamma rays were detected with a EUROBALL CLUSTER detector and a single HPGe detector. In all investigated nuclei two or three prominent dipole transitions were identified at E_γ ≈ 3 MeV. The corresponding low-lying J = 1 states are interpreted as two-phonon excitations. Quasiparticle-phonon-model calculations predict at about 3 MeV one 1⁻ state arising from the coupling of the first quadrupole and the first octupole phonon, and one 1⁺ state arising from the coupling of the first and the second quadrupole phonon, where the latter has isovector character. Such an excitation mode can be considered as an analogue of the scissors mode in vibrational nuclei. The calculated transition strengths are compatible with experimental ones within a factor of about 1.5.

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¹: Present address: LOGICA, Cobham, Surrey KT11 3LX, UK.

²: Present address: Lafayette College, Easton, PA 18042, USA.

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Nuclear Physics A

Abstract

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Cited by (23)

Nuclear Data Sheets for A = 124

Nuclear structure of <sup>126</sup> Te studied with the (n, γ) reaction

Lifetime measurement in <sup>124</sup>Te

Study of <sup>124</sup>Te by the <sup>122</sup>Sn(α,2nγ) reaction and by the decay of <sup>124</sup>I

Particle-hole excitations in the interacting boson model (II): The U(5)-O(6) coupling

Two-phonon J = 1 states in even-mass Te isotopes with A = 122-130