Non-collective oblate states in121Te

Two new neutron-deficient isotopes,²¹³Pa and²¹⁴Pa were produced in complete fusion reactions of⁵¹V-ions with¹⁷⁰Er targets at (5.2–5.6) AMeV. The assignment was based on delayed evaporation residue - - time and position coincidences. The- decay energies of^213,214Pa were measured to be E=(8236±20) keV and E=(8116±20) keV, respectively. The half-lives of^213,214Pa were determined to be T_1/2=(5.3 _–1.6 ^+4.0 ms and T_1/2=(17 ±3) ms, respectively.This article was processed by the author using the LAT_EX style filecljour2 from Springer-Verlag.     

Noncollective oblate states in 113Te

High-spin states of 113Te were studied by in-beam spectroscopy using the 88Sr (28Si, 3n) fusion-evaporation reaction at a beam energy of 120 MeV. 7-7, charged particle-7-7 coincidences, and 7-7 angular correlation analyses were employed for determining the level scheme of 113Te. The levels based on the 11/2 - state in 113Te were identified for the first time. The present result of the level scheme of 113Te was in accord with the systematics of those in the heavier isotopes, namely 115Te and 117Te. A particularly favoured 37/2+ state was observed and suggested to be the fully aligned noncollective oblate 7r[(g9/2)2]6+ <8)^[(^5/2) <8s> (h 11/2)2]25/2+ configuration.     

High-spin states in123Te

The¹⁰Be(¹²C,¹⁴O)⁸He-reaction has been used to study the levels of⁸He. In addition to the known excited state of⁸He at E _x =3.6MeV, withJ ^π=2⁺, three additional states were found at excitation energies of 4.54(25)MeV, 6.03(10)MeV and 7.16(4)MeV.     

High-spin states in121Te

The baryon density calculated at the collision center in relativistic heavy ion collisions is not representative for the density really probed by baryons in the high density collision phase. A decomposition into nucleon- and-resonance densities yields average values of 1.25N/o and 0.25/ ₀ at the time of maximum compression.work supported by GSI and BMFT     

High spin states in117Te

High spin states in ¹¹⁷Tewere populated following the ¹⁰⁸Pd(¹⁶O,2p5n)reaction at E_lab=84MeV and the subsequent de-excitation was studied using ray spectroscopic techniques. Two new bands consisting of E2 transitions were established upto spins 41/2 and 45/2, above the band built on v[505]11/2^– orbital. Such bands are seen for the first time in the systematics of odd- mass Te- nuclei.     

High spin states in116,118Te

High spin states in^116,118Te, populated in¹⁰²Ru(¹⁹F,p ⁴ n) and¹¹⁰Pd (¹³C, 5n) reactions, have been studied throughγ-ray spectroscopy. The level schemes have been established up toI?25?. A favouredI ^π = 16⁺ state in these nuclei is suggested to be based on the fully alignedπ[(g _7/2)²]₆ ⁺?ν[(h _11/2)²]₁₀ ⁺ non-collective oblate configuration. This assignment is supported by TRS cranking calculations, which also predict similar non-collective oblate assignment for states at 14^?, 19^? and 22^? in these nuclei.     

High spin states in121Te

High spin states of¹²¹Te, populated in the¹¹⁴Cd(¹¹B,p3n) reaction, have been studied throughγ-ray spectroscopy. The level scheme has been established up toJ ^π=51/2^?. Three-quasiparticle states, based on the πg _7/2 ²?νh _11/2 andπg _7/2 d _5/2?νh _11/2 configurations, have been identified. A favoured 39/2^? state is suggested to be the fully aligned [πg _7/2 ²]₆₊?[νh _11/2 ³ _27/2? yrast non-collective oblate configuration. This assignment is supported by Total Routhian Surface (TRS) calculations which also suggest a similar oblate assignment to the states atJ ^π=21/2^? and 23/2^?. A higher 47/2^? state is also found and is suggested to be the fully aligned [πg _7/2 ²]₆₊?[νh _11/2 ⁵]_35/2? configuration.     

High spin states in115Te

Isotopic ratios were measured for Li, Be and B produced in p+Al, p+Nl and p+Ag reactions. The experimental data were analysed in the framework of the Quantum Statistical Model in order to relate the isotopic yield ratios to the baryonic entropy.     

High spin states in 121Te

High spin states of ¹²¹Te, populated in the ¹¹⁴Cd (¹¹B, p3n) reaction, have been studied through γ-ray spectroscopy. The level scheme has been established up to J^π = 51/2^?. Three-quasiparticle states, based on the ^πg _7/2 ² ? vh_11/2 and πg _7/2d_5/2 ? vh_11/2 configurations, have been identified. A favoured 39/2^? state is suggested to be the fully aligned [πg_7/2 ²]6 + ? [vh _11/2 ³]_27/2? yrast non-collective oblate configuration. This assignment is supported by Total Routhian Surface (TRS) calculations which also suggest a similar oblate assignment to the states at J^π = 21/2^? and 23/2^?. A higher 47/2^? state is also found and is suggested to be the fully aligned [πg_7/2 ²]₆+ ? [vh _11/2 ⁵]_35/2? configuration.     

High spin states in116Te

The high spin states in¹¹⁶Te were populated in the Ru(¹⁹F,p4n) reaction at E_lab=90MeV and the subsequent deexcitation was studied using the γ-ray spectroscopic techniques. Ninteen new transitions have been added to extend the level scheme. A ΔI=2 rotational band is identified for the first time in an even-A Tellurium nucleus.     

Low energy nuclear states in124Te

The energy level scheme of¹²⁴Te has been established on the basis of singlesγ-spectra, andγ-γ coincidence measurements carried out using a dual parameter data collection system. Ge(Li) detectors were used to study the gamma spectra produced in theβ ^? decay of¹²⁴Sb. Eleven new transitions and two new energy levels are proposed. Relative intensities, branching ratios,α(K) and logft values were calculated and multipolarities, spins and parities deduced. Comparisons are made with predictions of the Interacting Boson Model: in a first order perturbation approximation to theSU (5) limit, using the complete IBA-1 Hamiltonian, and in theO(6) limit.     

Rotational and vibrational states in 115Te

High-spin states of the ¹¹⁵Te were studied by in-beam spectroscopy with the ⁸⁹Y (²⁹Si, p2n) fusion-evaporation reaction at a beam energy of 108 MeV. γ?γ coincidence and γ?γ angular correlation analyses were employed for determining the level scheme of ¹¹⁵Te. We have identified two vibrational-like bands built on the νh_11/2 and νg_7/2 quasiparticle states and the noncollective oblate states from the full alignment of quasiparticle configurations. In addition, a regular ΔI = 2 sequence with positive-parity was found for the first time in odd-A Te nuclei. This sequence is interpreted as a deformed structure resulting from three-quasiparticle alignment having the [π(g_7/2, h _11/2) ? ν(h _11/2)] configuration. Calculations of total Routhian surfaces and cranked shell model were performed and were used for assigning quasiparticle configurations to the states in ¹¹⁵Te.     

Gyromagnetic ratios of excited states in 123, 125Te

The results of integral precession measurements are reported for $\text{3}\text{2}{}^{\mathrm{+}}$ and $\text{5}\text{2}{}^{\mathrm{+}}$ excited states in ^123,125Te. The measurements were made using the ion implantation perturbed angular correlation technique by recoiling the excited nuclei into polarized iron. The measured mean lifetimes and g-factors are: ${}^{123}\text{Te (440 keV,}\text{3}\text{2}{}^{\mathrm{+}}\text{) τ = 39±4 ps, g = 0.34 ± 0.06}$; $\text{(505 keV,}\text{5}\text{2}{}^{\mathrm{+}}\text{) τ = 26±3 ps, g = 0.04±0.025}$; and ${}^{125}\text{Te(443 keV,}\text{3}\text{2}{}^{\mathrm{+}}\text{) ρ = 27±3.3 ps, g = 0.39±0.06}$; $\text{(464 keV,}\text{5}\text{2}{}^{\mathrm{+}}\text{) g = 0.12±0.04}$. The results are compared with theoretical predictions.     

Local environment of Te in GaTe and Ga2Te3 studied with119Sn and129I Mössbauer spectroscopy

The compounds GaTe and Ga₂Te₃ have been studied with Mössbauer source spectroscopy, using the decays^119mTe→¹¹⁹Sb→¹¹⁹Sn and^129mTe→¹²⁹I. For Ga₂Te₃, which has a defect zincblende structure, the spectra give satisfactory fits using two components with intensity ratio roughly 2∶1, in agreement with the two crystallographic sites in this compound. The Mössbauer spectra of GaTe are not easily understood in terms of the three inequivalent Te sites present in this compound. The relevance of these results for the interpretation of Mössbauer spectra observed after high-dose Te implantation in GaAs is discussed.     

Study of the excited states of119Sn by the decay of119g+m In

The decay of^119g+m In to the excited states of¹¹⁹Sn was investigated.¹¹⁹In was produced by the¹²⁰Sn(γ,p)¹¹⁹In reaction on an enriched SnO₂ target. The isomeric transition of 311.25 keV to the¹¹⁹In ground state was observed. In the beta decay of^119m In excited states at 23.9, 920.5, 921.4, 1089.0, 1187.9 and 1249.6keV in¹¹⁹Sn withJ ^π values of 3/2⁺, 3/2⁺, 5/2⁺, 5/2⁺, 3/2⁺ and 1/2⁺ respectively, are fed. In the decay of the¹¹⁹In ground state only the 7/2⁺ level in¹¹⁹Sn at 787.0 keV is fed.     

Low-lying states of 119Sb studied from the decay of 119mTe

The electron-capture decay of ^119mTe was investigated with an iron-free π√2 β-spectrometer and Ge(Li) detectors. The investigation includes subshell-ratio and γγ angular correlation measurements in addition to conversion-coefficient and γγ coincidence measurements. The level scheme of ¹¹⁹Sb was proposed, which incorporates 13 excited states and 34 transitions. The spin-parities were determined as follows: $\text{270.53}\text{keV}\text{7}\text{2}{}^{\mathrm{+}}\text{, 970.91}\text{9}\text{2}{}^{\mathrm{+}}\text{, 1048.42}\text{7}\text{2}{}^{\mathrm{+}}\text{, 1212.75}\text{9}\text{2}{}^{\mathrm{+}}\text{, 1249.78}\text{9}\text{2}{}^{\mathrm{+}}\text{, 1366.32}\text{11}\text{2}{}^{\mathrm{?}}\text{, 1407.21}\text{11}\text{2}{}^{\mathrm{+}}\text{, 2129.83}\text{9}\text{2}{}^{\mathrm{?}}\text{, 2226.02}\text{11}\text{2}{}^{\mathrm{?}}\text{, 2278.87}\text{13}\text{2}{}^{\mathrm{?}}\text{, 2283.78}\text{9}\text{2}{}^{\mathrm{?}}\text{, 2360.22}\text{9}\text{2}{}^{\mathrm{?}}\text{and}\text{2379.61 (}\text{9}\text{2}\text{,}\text{13}\text{2}\text{)}{}^{\mathrm{?}}$. The level structure of ₅₁¹¹⁹Sb₆₈ is discussed in comparison with a core-particle coupling calculation. All the levels seen in the decay of ^119mTe are correlated with the theoretical levels except for the 970.91 $\text{9}\text{2}$⁺ level, which has been recently identified as a deformed state.     

First observation of excited states in the neutron-rich nucleus 138Te

The very neutron-rich nucleus ¹³⁸Te produced in the spontaneous fission of ²⁴⁸Cm has been investigated using the EUROGAM II %-ray multidetector array. The excited states of ¹³⁸Te observed for the first time indicate that the region of ground state deformation beyond the doubly magic nucleus ¹³²Sn has yet not been reached.     

Collective states and shape competition in ~(126)Te

High-spin states in ~(126)Te have been investigated by using in-beam γ ray spectroscopy with the ~(124)Sn(~7Li,1p4n)~(126)Te reaction at a beam energy of 48 MeV.The previously known level scheme has been enriched,and a new negative-parity sequence has been established.The yrast positive-parity band shows a shape change between triaxial shape and collective oblate shape as a function of spin.In particular,three competitive minima appear in the potential energy surface for the I~π=8~+ states,with one aligned state at γ =-120° and two triaxial states atγ ~30° and-45°,respectively.The signature splitting behavior of the negative-parity band is discussed.The shape change with increasing angular momentum and the signature splitting can be interpreted well in terms of the Cranked Nilsson-Strutinsky-Bogoliubov and Cranked Nilsson-Strutinsky model calculations.