Multiplet structure in 205Pb AND 203Pb

Blomqvist, J.; Rydström, L; Liotta, R.J.; Pomar, C.

doi:10.1016/0375-9474(84)90590-6

Cited by 27 publications

(33 citation statements)

References 12 publications

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“…The particular system that is of our interest here, i.e., the three-particle case, can be found in Ref. [24], where the MSM was applied to study the three-neutron hole states in the nucleus 205 Pb. Using the Berggren single-particle representation described above, we will evaluate the complex energies and wave functions of 12 Li using the MSM basis states consisting of the Berggren one-particular states, which are states in 10 Li, times the two-neutron excitations that determine the low lying spectrum of 11 Li.…”

Section: The Multistep Shell Model Methodsmentioning

confidence: 99%

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Analysis of the unbound spectrum of 12Li

Xu¹,

Liotta²,

Qi³

et al. 2011

Nuclear Physics A

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Section: The Multistep Shell Model Methodsmentioning

confidence: 99%

“…Below we refer to this formalism as CXMSM. The three-particle energies W (α 3 ) are given by [24] (W (…”

Section: The Multistep Shell Model Methodsmentioning

confidence: 99%

Analysis of the unbound spectrum of 12Li

Xu¹,

Liotta²,

Qi³

et al. 2011

Nuclear Physics A

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“…11 (see also Table V), where it is compared with that established earlier for the 10 + and 27/2 − isomers over the A = 116 -130 mass range. For isomeric transitions between ν(h 11/2 ) n states, the dependence of the B(E2) probabilities on the νh 11/2 subshell occupation number n and on the neutron effective charge e ef f , taking the radial matrix element < r 2 > for νh 11/2 to be 32 fm 2 , can be expressed [22] Following Refs. [4][5][6][7][8]10], it is convenient to plot the E2 transition amplitudes (or square roots of the measured B(E2) values) versus A, using the previously adopted convention that these amplitudes must be of opposite sign in the bottom and top halves of the νh 11/2 subshell, and cross zero at the half-filled shell, when particle and hole contributions cancel each other.…”

Section: Dmentioning

confidence: 99%

Shell-model states with seniorityν=3, 5, and 7 in odd-Aneutron-rich Sn isotopes

et al. 2016

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Excited states with seniority ν = 3, 5, and 7 have been investigated in odd neutron-rich 119,121,123,125 Sn isotopes produced by fusion-fission of 6.9-MeV/A 48 Ca beams with 208 Pb and 238 U targets and by fission of an 238 U target bombarded with 6.7-MeV/A 64 Ni beams. Level schemes have been established up to high spin and excitation energies in excess of 6 MeV, based on multifold gamma-ray coincidence relationships measured with the Gammasphere array. In the analysis, the presence of isomers was exploited to identify gamma rays and propose transition placements using prompt and delayed coincidence techniques. 121 Sn, has now been confirmed. In both cases, isomeric half-lives were determined with good precision. In the range of ν = 3 excitations, the observed transitions linking the various states enabled one to propose with confidence spin-parity assignments for all the observed states. Above the 27/2 − isomers, an elaborate structure of negative-parity levels was established reaching the (39/2 − ), ν = 7 states, with tentative spin-parity assignments based on the observed deexcitation paths as well as on general yrast population arguments. In all the isotopes under investigation, strongly populated sequences of positive-parity (35/2 + ), (31/2 + ), and (27/2 + ) states were established, feeding the 23/2 + isomers via cascades of three transitions. In the 121,123 Sn isotopes, these sequences also enabled the delineation of higher-lying levels, up to (43/2 + ) states. In 123 Sn, a short half-life was determined for the (35/2 + ) state. Shell-model calculations were carried out for all the odd Sn isotopes, from 129 Sn down to 119 Sn, and the results were found to reproduce the experimental level energies rather well. Nevertheless, some systematic deviations between calculated and experimental energies, especially for positive-parity states, point to the need to improve some of the two-body interactions used in calculations. The computed wave-function amplitudes provide for a fairly transparent interpretation of the observed level structures. The systematics of level energies over the broad A = 117 -129 range of Sn isotopes displays a smooth decrease with mass A, and the observed regularity confirms most of the proposed spin-parity assignments. The systematics of the B(E2) reduced transition probabilities extracted for the 23/2 + and 19/2 + isomers is discussed with an emphasis on the close similarity of the observed A dependence with that of the E2 transition rates established for other ν = 2, 3, and 4 isomers in the Sn isotopic chain.

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“…Blomqvist suggested, without proof, that n in the SRF (1) can be reinterpreted as the occupation number [14]. Discussion based on the BCS approximation was given in Ref.…”

Section: Extension Of the Seniority Reduction Formulamentioning

confidence: 99%

“…3-2 of Ref. [14]). The number of the particles excited out of the Z = 64 core N exc ≡ 14 − ( N 0g 7/2 + N 1d 5/2 ) in the isomers is plotted as well, in the right panel of Fig.…”

Section: E2 Strengths Of the High-spin Isomersmentioning

confidence: 99%

Erratum: Seniority isomerism in proton-richN=82isotones and its indication to stiffness of theZ=64core [Phys. Rev. C62, 054304 (2000)]

Matsuzawa¹,

Nakada²,

Ogawa³

et al. 2001

Phys. Rev. C

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Seniority isomerism in proton-rich N = 82 isotones and its indication to stiffness of the Z = 64 core AbstractThe 10 + and 27/2 − isomers of the Z > 64, N = 82 nuclei are investigated in the shell model framework. We derive an extended seniority reduction formula for the relevant E2 transition strengths. Based on the extended formula, as well as on the approximate degeneracy among the 0h 11/2 , 2s 1/2 and 1d 3/2 orbits, we argue that the B(E2) data require the 146 Gd core excitation. The energy levels of both parities and the B(E2) values are simultaneously reproduced by a multi-j shell model calculation with the MSDI, if the excitations from (0g 7/2 1d 5/2 ) to (0h 11/2 2s 1/2 1d 3/2 ) are taken into account.

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Multiplet structure in 205Pb AND 203Pb

Cited by 27 publications

References 12 publications

Analysis of the unbound spectrum of 12Li

Analysis of the unbound spectrum of 12Li

Shell-model states with seniorityν=3, 5, and 7 in odd-Aneutron-rich Sn isotopes

Erratum: Seniority isomerism in proton-richN=82isotones and its indication to stiffness of theZ=64core [Phys. Rev. C62, 054304 (2000)]

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