Bonn potential and shell-model calculations for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>126</mml:mn><mml:mn /></mml:math>isotones

Coraggio, L.; Covello, A.; Gargano, A.; Itaco, N.; Kuo, T.T.S.

doi:10.1103/physrevc.60.064306

Cited by 35 publications

(36 citation statements)

References 36 publications

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“…Residual interactions between nucleons occupying these orbitals, derived already in 1970 by Kuo and Herling [1], and subsequently readjusted taking into account new experimental results, have proved quite successful in reproducing the observed levels as shown, for instance, by Warburton and Brown [2]. Furthermore, theoretical efforts to determine residual interactions directly from the Bonn potential for free nucleons proved to be successful as well: this was demonstrated, for example, in the case of the two-proton nucleus 210 Po by Corragio et al [3], and by other shell-model calculations particularly those describing excitations associated with neutron holes in the 208 Pb core (see [3] and refs. therein).…”

Section: Introductionmentioning

confidence: 86%

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

et al. 2017

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Abstract:Yrast and near-yrast levels up to spin values in excess of I = 30ħ have been delineated in the doubly-magic 208 Pb nucleus following deep-inelastic reactions involving 208 Pb targets and, mostly, 430-MeV 48 Ca and 1440-MeV 208 Pb beams. The level scheme was established up to an excitation energy of 16.4 MeV, based on multi-fold γ-ray coincidence relationships measured with the Gammasphere array. Below the well-known, 0.5-μs 10 + isomer, ten new transitions were added to earlier work. The delineation of the higher parts of the level sequence benefited from analyses involving a number of prompt-and delayed-coincidence conditions. Three new isomeric states were established along the yrast line with I π = 20 -(10342 keV), 23 + (11361 keV), and 28 -(13675 keV), and respective half-lives of 22(3), 12.7(2), and 60(6) ns. Gamma transitions were also identified preceding in time the 28 -isomer, however, only a few could be placed in the level scheme and no firm spin-parity quantum numbers could be proposed. In contrast, for most states below this 28 -isomer, firm spin-parity values were assigned, based on total electron-conversion coefficients, deduced for low-energy (<500 keV) transitions from γ-intensity balances, and on measured γ-ray angular distributions. The latter also enabled the quantitative determination of mixing ratios. The transition probabilities extracted for all isomeric transitions in 208 Pb have been reviewed and discussed in terms of the intrinsic structure of the initial and final levels involved. Particular emphasis was placed on the many observed E3 transitions as they often exhibit significant enhancements in strength (of the order of tens of W.u.) comparable to the one seen for the neutron j 15/2 →g 9/2 E3 transition in 209 Pb. In this context, the enhancement of the 725-keV E3 transition (56 W.u.) associated with the decay of the highest-lying 28 -isomer observed in this work remains particularly challenging to explain. Large-scale shell-model calculations were performed with two approaches, a first one where the 1, 2, and 3 particle-hole excitations do not mix with one another, and another more complex one, in which such mixing takes place. The calculated levels were compared with the data and a general agreement is observed for most of the 208 Pb level scheme. At the highest spins and energies, however, the 2 correspondence between theory and experiment is less satisfactory and the experimental yrast line appears to be more regular than the calculated one. This regularity is notable when the level energies are plotted versus the I(I+1) product and the observed, nearly linear, behavior was considered within a simple "rotational" interpretation. Within this approximate picture, the extracted moment of inertia suggests that only the 76 valence nucleons participate in the "rotation" and that the 132 Sn spherical core remains inert. --------------------------

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Section: Introductionmentioning

confidence: 86%

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

et al. 2017

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“…The B(E2; 2 + 1 → 0 + 1 ) value is determined from the cross-sections for populating the 2 + 1 state in 210 Po in inelastic scattering of deuterons and protons [11]. Largescale shell-model studies of 210 Po using realistic interactions [12,13] excellently reproduce the energies of the yrast 2 + , 4 + , 6 + , and 8 + levels as can be seen in Fig. 1.…”

Section: Introductionmentioning

confidence: 89%

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

et al. 2017

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“…These revised shell model calculations reproduce the measured magnetic and quadrupole moments of the 5 − isomer in It is thus found that small modifications to the twobody interaction, though not unambiguous, significantly improve the description of levels and γ transition rates in 204 Pt. Recently new approaches to infer realistic nucleon-nucleon interactions were made, based on the re-normalised G-matrix [27,28] and the V low−k potential [29]. Further investigations, both experimental and theoretical, are needed to understand the nuclear structure evolution of the N ∼ 126 region towards the anticipated r-process waiting nuclei at Z ≤ 72.…”

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confidence: 99%

Single-particle behavior atN=126: Isomeric decays in neutron-richPt204

Steer¹,

Podolyák²,

Piétri³

et al. 2008

Phys. Rev. C

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The four proton-hole nucleus, 204 Pt, was populated in the fragmentation of an E/A = 1 GeV 208 Pb beam. The yrast structure of 204 Pt has been observed up to angular momentum I = 10 by detecting delayed γ-ray transitions originating from metastable states. These long-lived excited states have been identified to have spin-parities of I π = (10 + ), (7 − ) and (5 − ) and half-lives of T 1/2 = 146(14) ns, 55(3) µs and 5.5(7) µs, respectively. The structure of the magic N = 126 204 Pt nucleus is discussed and understood in terms of the spherical shell model. The data suggests a revision of the two-body interaction for N = 126, Z < 82, which determines the evolution of nuclear structure towards the r-process waiting point nuclei.PACS numbers: 29.30. Kv, 23.20.Lv The evolution of the properties of atomic nuclei with respect to neutron and proton numbers is a key question of nuclear physics. The study of unstable, neutron-rich nuclei represents one of the foremost pursuits of modern nuclear physics. Over the coming decade new radioactive ion beam facilities are being built with the main objectives being to probe neutron-rich nuclei. Within recent years surprising phenomena have been observed in neutron-rich nuclei such as neutron skins, halos and dramatic changes in the ordering and spacing of energy levels [1].While the stability of the N = 82 shell gap is an active topic of research [2,3], an open question is whether or not there is a quenching of the N = 126 shell gap as protons are removed from doubly magic 208 Pb. The proton dripline has been experimentally reached up to heavy elements [4], our present knowledge of the neutron dripline is limited to light species. The part of the nuclear chart with the least information on neutron-rich nuclei is the 76 Os to 82 Pb region, with experimental knowledge on only a few isotopes. This mass region is however an ideal testing ground of nuclear theories. With the removal of just a few protons and neutrons the landscape evolves from spherical to elongated prolate through disk shaped oblate and triaxial forms [5]. Consequently the information gained on neutron-rich, N = 126 nuclei is essential for the understanding of nuclear structure in heavy nuclei. From a longer-term perspective, experi-

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Bonn potential and shell-model calculations forN=126isotones

Cited by 35 publications

References 36 publications

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

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

Single-particle behavior atN=126: Isomeric decays in neutron-richPt204

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