A revised B(E2;2+ 1 $ \rightarrow$ → 0+ 1) value in the semi-magic nucleus 210Po

Kocheva, D.; Rainovski, G.; Jolie, J.; Pietralla, N.; Blazhev, A.; Astier, A.; Altenkirch, Robert A.; Ansari, S. M. Razaullah; Braunroth, T.; Cortés, M. L.; Dewald, Α.; Diel, F.; Djongolov, M.; Fransen, C.; Gladnishki, K.; Hennig, Andreas; Karayonchev, V.; Keatings, J. M.; Kluge, E. E.; Litzinger, J.; Müller-Gatermann, C.; Petkov, P.; Rüdigier, M.; Scheck, M.; Scholz, Philipp; Spagnoletti, P.; Spieker, M.; Stahl, C.; Stegmann, R.; Stoyanova, M.; Thöle, P.; Warr, N.; Werner, V.; Witt, William Edward; Wölk, D.; Zell, K. O.; Isacker, P. Van; Ponomarev, V. Yu.

doi:10.1140/epja/i2017-12367-5

Cited by 18 publications

(14 citation statements)

References 33 publications

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“…As shown below in this Section, an analysis of higher-excited states in 210 Po corresponding nominally to the π1h 2 9/2 configuration implies e p ≈ 1.5e. The experimental B(E2) in Table 2 for 210 Po is deduced from a recent lifetime measurement by the Doppler shift attenuation method following the 208 Pb( 12 C, 10 Be) 210 Po reaction, which gave τ = 2.6 ± 0.4 ps [49]. This new result is certainly an improvement on the previous measurement which used (d,d ) above the Coulomb barrier to excite a 210 Po target [66].…”

Section: Nuclidementioning

confidence: 68%

“…This new result is certainly an improvement on the previous measurement which used (d,d ) above the Coulomb barrier to excite a 210 Po target [66]. However, it is difficult to measure such a short lifetime below the longer-lived 4 + , 6 + and 8 + states that tend to also be populated in heavy ion reactions; Kocheva et al [49] recommend additional experiments. Coulomb excitation of the radioactive beam (e.g., at ISOLDE where 210 Po activity remains in used ion sources) would be a possibility, avoiding the problem of feeding from the longer-lived higher excited states.…”

Section: Nuclidementioning

confidence: 76%

“…Figure 60. [22], with the following exceptions: 46 Ar [45], 130,134 Sn [46,47], 134 Te [48], 210 Po [49]. There is no overall pattern in the effective charges shown in Table 2.…”

Section: Hints Of Correlations Beyond Pairing and Seniority At Closed...mentioning

confidence: 99%

“…However, there are subtleties in the mechanism by which such intruder states appear at low excitation energy. An example is shown in Figure 16 for low-energy excited states in 47,49 Ca. The naïve interpretation of the low energies of the 3/2 − state in 47 Ca and the 7/2 − state in 49 Ca would be that the N = 28 shell gap has broken down; but, with an understanding of the manifestation of pairing correlations, the reality is that the N = 28 shell gap is strongly present.…”

Section: Nuclidementioning

confidence: 99%

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To Shell Model, or Not to Shell Model, That Is the Question

Stuchbery

Wood

2022

Physics

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The present review takes steps from the domain of the shell model into open shell nuclei. The question posed in the title is to dramatize how far shell model approaches, i.e., many nucleons occupying independent-particle configurations and interacting through two-body forces (a configuration interaction problem) can provide a description of nuclei as one explores the structure observed where neither proton nor neutron numbers match closed shells. Features of doubly closed and singly closed shell nuclei and adjacent nuclei are sketched, together with the roles played by seniority, shape coexistence, triaxial shapes and particle–core coupling in organizing data. An illuminating step is taken here to provide a detailed study the reduced transition rates, B(E2;21+→01+), in the singly closed shell nuclei with doubly closed shell plus or minus a pair of identical nucleons, and the confrontation between such data and state-of-the-art shell model calculations: this amounts to a review of the effective charge problem. The results raise many questions and point to the need for much further work. Some guidance on criteria for sharpening the division between the domain of the shell model and that of deformation-based descriptions of nuclei are provided. The paper is closed with a sketch of a promising direction in terms of the algebraic structure embodied in the symplectic shell model.

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Section: Nuclidementioning

confidence: 68%

Section: Nuclidementioning

confidence: 76%

“…Figure 60. [22], with the following exceptions: 46 Ar [45], 130,134 Sn [46,47], 134 Te [48], 210 Po [49]. There is no overall pattern in the effective charges shown in Table 2.…”

Section: Hints Of Correlations Beyond Pairing and Seniority At Closed...mentioning

confidence: 99%

Section: Nuclidementioning

confidence: 99%

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To Shell Model, or Not to Shell Model, That Is the Question

Stuchbery

Wood

2022

Physics

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“…However this level is not included in the latest data evaluation of the 210 Po nuclear levels [5]. More recently the 208 Pb( 12 C, 10 Be) two-proton transfer was studied by D. Kocheva and collaborators [7] at Coulomb barrier energy, aiming to lifetime measurements. The lifetimes of the 2 + 1 , 2 + 2 , 3 − 1 states of 210 Po have been measured, and the B(E2; 2 + 1 → 0 + 1 ) reduced transition probability was notably revised to B(E2) = 136(21) e 2 fm 4 .…”

Section: Introductionmentioning

confidence: 99%

New excited 2+ and 3− two-proton states in Po126
Dupont
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Astier
²
,
Petrache
³

et al. 2020
Phys. Rev. C
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Five new 2 + levels have been established in the semi-magic 210 Po nucleus, from a 208 Pb(12 C, 10 Be) two-proton transfer experiment, performed at energies close to the Coulomb barrier at JAEA Tokai. A setup combining Ge, LaBr3, and Si telescopes was used to detect both in-beam gamma-rays and ejectile residues. The new 2 + states have been established by means of the transitions towards the 0 + ground state which are present in the gamma spectra produced by properly selecting the excitation energy in 210 Po after kinematical reconstruction. (f 7/2) 2 , h 9/2 ⊗ f 5/2 , (i 13/2) 2 , f 7/2 ⊗ p 3/2 and f 7/2 ⊗ f 5/2 two-proton configurations are assigned to these states. In addition, a new 3 − level has also been established in this nucleus, very likely originating from the f 7/2 ⊗ i 13/2 configuration. Shell model calculations strongly support these assignments.

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