High-spin states and collective oblate bands in the odd-odd<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Pr</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>138</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>nucleus

Li, M. L.; Zhu, S. J.; L., X.; Yu, Yefei; Chen, Y. J.; Ding, H. B.; Zhu, Lei; Wu, X. G.; Wen, Sheng; He, Chun; Cui, X. Z.; Liu, Y.

doi:10.1103/physrevc.75.034304

Cited by 14 publications

(8 citation statements)

References 33 publications

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“…Our value is compatible with those obtained via chiral effective Lagrangians [46], the most recent solution (G380) from energy-dependent partial-wave analysis [45] of elastic π ± p, π − p → π • n, and π − p → ηn scattering data, as well as with older findings [47,48]. Investigations based on chiral perturbation approaches [49][50][51] calculations within the T matrix [10,11,52] or K matrix [53] produce larger values, 0.5 < ∼ Re a ηN < ∼ 1.0 fm. Besides the process πN → ηN, η production using proton or deuteron beams has also been investigated by using various sets of ηN scattering lengths reported in the literature, as summarized in the following:…”

Section: Predictions For the ηN Scattering Length And The η P → ηsupporting

confidence: 88%

Coupled-channels study of theπ−p→ηnprocess

et al. 2008

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The reaction π − p → ηn is investigated within a dynamical coupled-channels model of meson production reactions in the nucleon resonance region. The meson baryon channels included are πN, ηN, π , σ N, and ρN. The nonresonant meson-baryon interactions of the model are derived from a set of Lagrangians by using a unitary transformation method. One or two excited nucleon states in each of S, P , D, and F partial waves are included to generate the resonant amplitudes. Data of the π − p → ηn reaction from threshold up to a total center-of-mass energy of about 2 GeV are satisfactorily reproduced and the roles played by the following nine nucleon resonances are investigated: . The reaction mechanism and the predicted ηN scattering length are discussed.

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Section: Predictions For the ηN Scattering Length And The η P → ηsupporting

confidence: 88%

Coupled-channels study of theπ−p→ηnprocess

et al. 2008

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“…In particular the 14 + level shows an abrupt decrease. Figure 12 shows the comparison between the N = 79 isotones, 134 Cs [20], 136 La of the present work, 138 Pr [21], and 140 Pm [22]. It is seen that the energies of the levels up to 12 + are almost the same in these nuclei, whereas the levels above 13 + show clear variation as a function of the proton number.…”

Section: A Systematic Comparison With Neighboring Nucleimentioning

confidence: 69%

High-spin states inLa136and possible structure change in theN=79region

et al. 2015

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High-spin states in the odd-odd nucleus 136 La, which is located close to the β-stability line, have been investigated in the radioactive-beam-induced fusion-evaporation reaction 124 Sn( 17 N,5n). The use of the radioactive beam enabled a highly sensitive and successful search for a new isomer [14 + , T 1/2 = 187 (27) ns] in 136 La. In the A = 130-140 mass region, no such long-lived isomer has been observed at high spin in odd-odd nuclei. The 136 La level scheme was revised, incorporating the 14 + isomer and six new levels. The results were compared with pair-truncated shell model (PTSM) calculations which successfully explain the level structure of the πh 11/2 ⊗ νh −1 11/2 bands in 132 La and 134 La. The isomerism of the 14 + state was investigated also by a collective model, the cranked Nilsson-Strutinsky (CNS) model, which explains various high-spin structures in the medium-heavy mass region. It is suggested that a new type of collective structure is induced in the PTSM model by the increase of the number of πg 7/2 pairs, and/or in the CNS model by the configuration change associated with the shape change in 136 La.

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“…Thus, at the high-spin states, the different quasiparticle configurations in a nucleus will give rise to different nuclear shapes. In previous publications, one of important results is the observation of oblate bands caused by such shape driving effects, for instance, in 131,136,137 La [2,12,13], 132 Ba [14], 137,138 Ce [15,16], 137,138 Pr [17,18], 139 Nd [19], and 140,141 Pm [20,21].…”

Section: Introductionmentioning

confidence: 95%

High-spin structures in the139Pr nucleus

et al. 2012

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Background: 139 Pr is located in a transitional region of neutron number close to the N = 82 shell. The study of its high-spin states and collective bands is important for systematically understanding the nuclear structural characteristics in this region. Purpose: To investigate the high-spin levels and to search for oblate bands in 139 Pr. Methods: The high-spin states of 139 Pr have been studied via the reaction 124 Sn( 19 F,4n) at a beam energy of 80 MeV. The experiment was carried out at the HI-13 Tandem Accelerator at the China Institute of Atomic Energy (CIAE). The data analysis was done by using the γ -γ coincidence method. Results: The level scheme of 139 Pr has been expanded with spin up to 45/2h. A total of 39 new levels and 45 new transitions are identified. Four collective band structures at high-spin states have been newly established. From systematic analysis, one of the bands is proposed as a double decoupled band; two bands are proposed as oblate bands with γ ∼ −60 • ; another band is suggested as an oblate-triaxial band with γ ∼ −90 • . The other characteristics for these bands are discussed. Conclusions:A new level scheme in 139 Pr has been established and the collective bands at high spin have been identified. The result shows that the strong oblate shape-driving effect is caused by neutrons at the high-spin states in 139 Pr.

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High-spin states and collective oblate bands in the odd-oddPr138nucleus

Cited by 14 publications

References 33 publications

Coupled-channels study of theπ−p→ηnprocess

Coupled-channels study of theπ−p→ηnprocess

High-spin states inLa136and possible structure change in theN=79region

High-spin structures in the139Pr nucleus

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