Two-quasiparticle isomeric states in doubly odd Bi nuclei

Hagemann, Ulrich; Kaun, K.‐H.; Neubert, W.; Schulze, W.; Stary, F.

doi:10.1016/0375-9474(72)90750-6

Cited by 34 publications

(11 citation statements)

References 12 publications

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“…When the present investigation of 2~ was started a 0.88ms 10-state of the 7ch9/zVi131/2(j-2)o + configuration at 1045keV [5][6][7] was known, and the decay of this to the ground state of the …”

Section: Introductionmentioning

confidence: 99%

High-spin states in206Bi populated in the205Tl(?, 3n) reaction

Lönnroth

Végh

Wikström³

et al. 1978

Z Physik A

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Using alpha-particles in the energy range 35-51MeV and in-beam gamma ray and conversion electron spectroscopy techniques the reaction 2~ 3n)Z~ was studied. A 15 _+1 ns isomeric 15 + state was found at an excitation energy of 3147keV in 2~ The main configuration of the isomeric state is suggested to be 7"ch9/2 vp~/~i~/2. The isomeric state decays mainly through a stretched cascade of five gamma rays to the previously known 0.88ms 10-state of the 7ch9/2 vi13~2(j-2)o + configuration at an excitation energy of 1045 keV. A shell model calculation of the yrast states has been performed and it is found that the calculation agrees fairly well with the experiments. The average deviation between experimental and calculated energies for the yrast states with angular momenta in the region 6-18 is +4keV and the root mean square deviation is 22keV.

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Section: Introductionmentioning

confidence: 99%

High-spin states in206Bi populated in the205Tl(?, 3n) reaction

Lönnroth

Végh

Wikström³

et al. 1978

Z Physik A

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“…Therefore, the excitation energy of this state remains unknown. A 10 − isomeric state was reported by Hagemann et al [11] at an excitation energy of 248 keV with respect to the 11.6-min isomeric state. This state was interpreted as a member of the | νi −1 13/2 ⊗ πh 9/2 ; J multiplet.…”

Section: Introductionmentioning

confidence: 76%

Crossing of large multiquasiparticle magnetic-rotation bands inBi198

Pai¹,

Mukherjee²,

Bhattacharyya³

et al. 2014

Phys. Rev. C

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High-spin states in the doubly-odd 198 Bi nucleus have been studied by using the 185,187 Re( 16 O, xn) reactions at the beam energy of 112.5 MeV. γ − γ coincidences, directional correlation ratio and integrated polarization asymmetry ratio were measured by using the INGA array with 15 Comptonsuppressed clover HPGe detectors. Definite spins and parities were assigned to the observed levels. The high-spin structure is grouped into three bands (B1, B2 and B3), of which two (B1 and B2) exhibit the properties of magnetic rotation (MR). Tilted axis cranking calculations were carried out to explain the MR bands having large multi-quasiparticle (qp) configurations. The calculated results explain the bands B1 and B2 very nicely, confirming the shears mechanism and suggest a crossing of two MR bands in both the cases. The crossing is from 6-qp to 8-qp in band B1 and from 4-qp to 6-qp in band B2, a very rare finding. A semiclassical model has also been used to obtain the particle-hole interaction strengths below the band-crossing for the bands B1 and B2.

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“…The 10 state is known [1,2] to be isomeric in light and even bismuth isotopes. In 2~ which has one proton and one neutron hole compared to the doubly magic nucleus 2~ the nuclear structure is dominated by the coupling of the odd proton and the neutron hole in different orbitals.…”

Section: Pacs: 2110kymentioning

confidence: 99%

Theg-factor of the 10? isomeric level in208At

Norlin¹,

Bergström²,

Carlé³

et al. 1985

Z Physik A

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The g-factor of the 10-level at 1,090 keV in 2~ has been determined by the Time Differential Perturbed Angular Distribution technique. The result g(10 )= +0.269(3) is in very good agreement with the shell model prediction for a pure (7~h9/2 vil~z)loconfiguration. PACS: 21.10.KyThe 10 state is known [1, 2] to be isomeric in light and even bismuth isotopes. In 2~ which has one proton and one neutron hole compared to the doubly magic nucleus 2~ the nuclear structure is dominated by the coupling of the odd proton and the neutron hole in different orbitals. The configuration of the 10-state in 2~is an almost pure (7~h9/2 vi13~2)10-configuration [3] and this state remains as a seniority two state also in the lighter bismuth isotopes. Isomeric 10-states have also been observed in 21~176176 [zV6] and the same two quasiparticle configuration as in bismuth is suggested for these states. Using the effective g-factors + 0.91347 (5) for the zc9/2 orbital [7] and -0.1496 (18) for the vil-3'/2 orbital [8] an estimate of the g-factor for a pure configuration becomes + 0.2660 (11). The g-factor of the 2.5 ms 10-isomeric state in 2~ has been measured [3] with a high precision and found to be +0.2672(14) in very good agreement with the expected value. It is of interest to study the influence of the removal of neutrons and/or the addition of protons on the g-factor of the (7~h9/2 -1 v~3/2)1o-configuration. From the measured g-factors of the 10-states in 2~[9, 10], 2~[11] and 2~ [12], which are nuclei with 1, 2 and 3 neutron pairs removed from the core, the conclusion is that the g-factors decrease slightly when neutrons are removed. The influence of adding a proton pair to the bismuth isotopes can be studied by measuring g-factors of the 10-states in the even astatine isotopes. In this letter we report conclusive results about the g-factor of the 10-state in 2~ This nucleus corresponds to 2~ with a proton pair added. The 10-state in 2~ is reported [5] to have a half-life of 45 ns and an excitation energy of 1,090 keV (cf. Fig. 1). Thus a g-factor measurement using the standard TDPAD-method [13] was found feasible. 2~ was produced in the reaction 2~ 5n) with alpha particles from the Stockholm 225-cm cyclotron. The deexciting gamma rays were detected with two Gedetectors positioned at + -135 degrees with respect to the beam direction. Data were recorded between the beam pulses in a two parameter energy versus time mode. A beam pulse separation time of 1.2 gs was achieved by suppressing twelve out of thirteen of the natural beam pulses with the external beam pulsing system [14]. In order to avoid electric quadrupole interactions the target was kept molten during the experiments. The results obtained with a gate on

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Two-quasiparticle isomeric states in doubly odd Bi nuclei

Cited by 34 publications

References 12 publications

High-spin states in206Bi populated in the205Tl(?, 3n) reaction

High-spin states in206Bi populated in the205Tl(?, 3n) reaction

Crossing of large multiquasiparticle magnetic-rotation bands inBi198

Theg-factor of the 10? isomeric level in208At

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