Strongly perturbed positive-parity bands in odd-mass erbium isotopes

Hjorth, S.A.; Ryde, H.; Hagemann, K.A.; Løvhøiden, G.; Waddington, J. C.

doi:10.1016/0375-9474(70)90342-8

Cited by 159 publications

(29 citation statements)

References 14 publications

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“…This second set of AI =2 levels is shifted up in energy relative to the yrast set and is thus interpreted as unfavoured members of the ila/2 band. Similar shifts have been observed in the light Er nuclei [12]. In coincidence to the L and M lines of the 78 keV transition in the conversion electron spectra another …”

Section: The 163 Yb Level Schemesupporting

confidence: 67%

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Level schemes of163, 165Yb and backbending behaviour of neutron deficient Yb-isotopes

Richter

1979

Z Physik A

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High spin states in 163,165yb have been populated using (160, xn) reactions with 152,154Sm targets. Several rotational bands are observed and the lifetime of highly converted transitions have been measured utilizing a solenoid-Si(Li) spectrometer and Ge(Li) detectors.The i13/2 and 3/2-[521] bands do not backbend, whereas the 5/2 [523] bands do, indicating additional processes besides the rotational alignment of one i13/2 neutron pair that are responsible for the backbending.

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Section: The 163 Yb Level Schemesupporting

confidence: 67%

“…In the isotope 161Er a half-life of (70+_20)ns is reported for the 9/2+--*7/2 transition [12]. Nevertheless, the spin and parity assignments are solidly confirmed from the energy systematics to the yrast cascades in 16s'167yb and the isotone X6XEr where also the 9//2 + level is the band head of the i 13/2 band.…”

Section: The 163 Yb Level Schemementioning

confidence: 56%

Level schemes of163, 165Yb and backbending behaviour of neutron deficient Yb-isotopes

Richter

1979

Z Physik A

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“…In the well-deformed 160 mass region, the properties of rotational bands in nuclei have been studied extensively [1][2][3][4][5][6][7][8][9][10][11]. In the odd-N nuclei with a prolate deformation, the neutron Fermi surface is located at the i 13/2 , h 9/2 , f 7/2 , and h 11/2 subshells, and variant types of rotational bands were observed experimentally [1][2][3][4][5][6][7][8].…”

Section: Introductionmentioning

confidence: 96%

Properties of the rotational bands inEr161

et al. 2011

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High-spin states in 161 Er have been studied experimentally using the 150 Nd( 16 O,5n) reaction at a beam energy of 86 MeV. The 5/2 + [642], 3/2 − [521], and 11/2 − [505] bands are extended up to high-spin states, and particularly the α = −1/2 branch of the ground state 3/2 − [521] band is revised significantly. The relatively enhanced E1 transitions from the 3/2 − [521] band to the 5/2 + [642] band are observed. The band properties are analyzed within the framework of a triaxial particle-rotor model, and near-prolate shape and triaxial deformation are proposed to the 3/2 − [521] and 5/2 + [642] bands, respectively. Signature inversion occurs in the 3/2 − [521] band after the band crossing in 161 Er, and the systematics of the signature inversion associated with the 3/2 − [521] configuration are discussed. By analyzing the properties of the relatively enhanced E1 transitions, it is found that the R(E1/E2) values show angular momentum dependence before the band crossing, and these enhanced E1 transitions could be attributed to octupole softness.

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“…5), we suggest possible reasons why backbending is delaYed for the ~h9/2 proton bands in the odd -Z, N=96 isotones 16STm and 167Lu. The experimental data on the energy levels of the N =96 and 97 isotones which are used in the present paper are extracted from the following references: 164Er [25][26][27]; a65Er [28]; 165Tm [18]; 166yb [29][30][31]; 167yb [32]; 167Lu [19]; 16SHf [29,33,34]; 169Hf [13]; 17~ [35]. The lifetimes of members of the g.s.…”

Section: Introductionmentioning

confidence: 99%

Backbending in theN=96 isotones

Michel¹,

Vervier²

1981

Z Physik A

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The backbending in the even-even, N =96 isotones can be quantitatively accounted for by the rotation-alignment of the spins of neutrons in i 13/2 orbits, as shown by comparing the aligned angular momentum and relative Routhian for the s-bands in these isotones and for the i13/2 bands in the corresponding isotopes with N=97. The influence of protons on this backbending situation is shown to be indirect, acting through a change of the nuclear deformation, which yields a change of the moment of inertia of the g.s. band and of the non-rigid character of the rotation. The experimental data on the N =96 and 97 isotones are in reasonable agreement with cranking model calculations. Possible reasons for the inhibition of backbending in the h 9/2 proton bands in the odd-Z, N = 96 isotones, all related to a change of deformation, are presented.

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Strongly perturbed positive-parity bands in odd-mass erbium isotopes

Cited by 159 publications

References 14 publications

Level schemes of163, 165Yb and backbending behaviour of neutron deficient Yb-isotopes

Level schemes of163, 165Yb and backbending behaviour of neutron deficient Yb-isotopes

Properties of the rotational bands inEr161

Backbending in theN=96 isotones

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