Level spectrum of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ra</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>219</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>and weak coupling in the light actinide region

Cottle, P. D.; Gai, M.; Ennis, J. F.; Jf, Shriner; Da, Bromley; Cw, Beausang; Hildingsson, L.; Wf, Piel; Db, Fossan; Jw, Olness; Warburton, E.K.

doi:10.1103/physrevc.36.2286

Cited by 14 publications

(6 citation statements)

References 44 publications

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“…On the average, the B(E1)/B(E2) values for the groundstate band extracted from this work are smaller than the ones presented in Ref. [5] and no systematic spin dependence can be observed. The average values are 1.7 x 10,1.1x 10,and 2.7 x 10 fm for the groundstate band, band I, and band II, respectively.…”

Section: Compton-suppressedcontrasting

confidence: 79%

“…This latter band was interpreted in terms of a weak coupling of the g9~2 neutron to the soft quadrupole core of ' Ra [5]. It is a Ii = 2 band according to calculations made by Leander and Chen [16], who coupled single-particle orbits from a deformed shell model including octupole deformation to a reflection-asymmetric core.…”

Section: Compton-suppressedmentioning

confidence: 95%

“…Its ground-state band shows a vibrational pattern dominated by odd multipole deformations up to high spins [5,6]. The purpose of this investigation was twofold: first, to search for the simplex partner band of the ground-state band as observed in other odd-A nuclei in this region [7 -10]; second, to clear up a discrepancy in the low-lying structure of this nucleus between two prior works [5,6]. ' [11] as the sum energy and multiplicity filter.…”

Section: Introductionmentioning

confidence: 99%

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Sidebands inRa219

et al. 1992

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Excited states inRa were studied by means of the Pb( C, 3n) reaction at 65 MeV. The investigation was made with 12 Compton-suppressed Ge detectors and a multicopnter array. Transitions in Ra were selected by requiring appropriate conditions on fold and sum energy. The proposed level scheme shows two sidebands with alternating parity structure decaying to the ground-state band. It is consistent with a recent description of Ra in the framework of the reflection-asymmetric meanfield approach, which predicts a K = z ground-state band and two low-lying bands with quantum numbers K =and K = -. 2 2' PACS number(s): 25.70.z, 23.20.Lv, 27.80.+w

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Section: Compton-suppressedcontrasting

confidence: 79%

Section: Compton-suppressedmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

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Sidebands inRa219

et al. 1992

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“…The levels for the three isotopes have been populated by different experiments. Indeed, the K π = 1/2 ± bands have been identified in 219 Ra with the reaction 208 Pb( 14 C,3n) 219 Ra [15], in 237 U via a pickup reaction on a 238 U target, while in 239 Pu with the so-called "unsafe" Coulomb excitation technique [14]. Our results suggest that the dominant K component is K = 1/2 while the dominant j component is g 9/2 .…”

Section: Numerical Resultsmentioning

confidence: 63%

Coherent state model extension for the description of positive and negative parity bands in even-odd nuclei

Râduţâ

Raduta²,

Faessler

2009

Phys. Rev. C

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A particle-core Hamiltonian is used to describe the lowest parity partner bands K π = 1/2 ± in 237 U and 239 Pu. The quadrupole and octupole boson Hamiltonian associated to the core is identical to the one previously used for the description of four positive and four negative parity bands in the neighboring even-even isotopes. The single particle space for the odd nucleon consists of three spherical shell model states, two of positive and one of negative parity. The particle-core Hamiltonian consists of four terms: a quadrupole-quadrupole, an octupole-octupole, a spin-spin and a rotationalÎ 2 interaction, withÎ denoting the total angular momentum. The parameters involved in the particle-core coupling Hamiltonian were fixed by fitting four particular energies in the two bands. The calculated excitation energies are compared with the corresponding experimental data as well as with those obtained with other approaches. Also, we searched for some signatures for a static octupole deformation in the considered odd isotopes.PACS numbers: 21.10. Re,21.60.Ev,27.80.+w,27.90.+b The coherent state model (CSM)[1] describes in a realistic fashion three interacting bands, ground, beta and gamma, in terms of quadrupole bosons. The formalism was later extended [2,3,4,5,6,7] by considering the octupole degrees of freedom. The most recent extension describes eight rotational bands, four of positive and four of negative parity. Observables like excitation energies, intraband E2 and interband E1, E2 and E3 reduced transition probabilities have been calculated and the results were compared with the corresponding experimental data. The formalism works well for both near spherical and deformed nuclei excited in low and high angular momentum states. Indeed, we considered all states with J ≤ 30 in both, the positive and the negative parity bands. Signatures for a static octupole deformation in ground as well as in excited bands have been pointed out in several even-even nuclei.The aim of this paper is to extend CSM for the evenodd nuclei which exhibit both quadrupole and octupole deformation. Thus, we consider a particle-core Hamiltonian:where H sp is a spherical shell model Hamiltonian associated to the odd nucleon, while H core is a phenomenological Hamiltonian which describes the collective motion of the core in terms of quadrupole and octupole bosons. This term is identical to that used in Ref.[7] to describe eight rotational bands in even-even nuclei. The two subsystems interact with each other by H pc , which has the following expression:b † λµ denotes the components of the λ-pole (with λ=2,3) boson operator. The term j J is similar to the spin-orbit interaction from the shell model and expresses the interaction between the angular momenta of the odd-particle and the core. The last term is due to the rotational motion of the whole system, I denoting the total angular momentum of the particle-core system. The core states are described by eight sets of mutually orthogonal functions, obtained by projecting out the angular momentum ...

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“…In attempts to determine the ground-state spin of 219 Ra, further in-beam high-spin experiments were conducted [9,10]. Among the different measurements, only a few excited states and transitions were common.…”

Section: Introductionmentioning

confidence: 99%

Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei

Såmark-Roth¹,

Sarmiento²,

Rudolph³

et al. 2018

Phys. Rev. C

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Short-lived α-decaying nuclei 'North-East' of 208 Pb in the chart of nuclides were studied using the reaction 48 Ca + 243 Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pileup events were extracted with a tailor-made pulse shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220 Ra and its odd-A neighbors, 219 Fr, and 221,219 Ra, with a focus on the 219 Ra→ 215 Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219 Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

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Level spectrum ofRa219and weak coupling in the light actinide region

Cited by 14 publications

References 44 publications

Sidebands inRa219

Sidebands inRa219

Coherent state model extension for the description of positive and negative parity bands in even-odd nuclei

Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei

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