Mixed-Symmetry Interacting-Boson-Model States in the Nuclei<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>140</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>,<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ce</mml

Hamilton, W D; Irbäck, Anders; Elliott, J.P.

doi:10.1103/physrevlett.53.2469

Cited by 175 publications

(66 citation statements)

References 11 publications

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“…We have performed an experiment employing the inversekinematics reaction 12 C( 136 Xe, 140 Ba) 8 Be at the Laboratori Nazionali di Legnaro (LNL) in order to populate excited states of the unstable nucleus 140 Ba. A beam of 136 Xe was provided by LNL's PIAVE/ALPI accelerator complex with an intensity of 0.5-1 pnA throughout the measurement.…”

Section: Methodsmentioning

confidence: 99%

“…The residual of the 12 C target nuclei after an α-transfer reaction, 8 Be, is unstable and immediately breaks up into two α particles with a Q value of 91.8 keV. Since the kinetic energy of the target-like product 8 Be is a function of its scattering angle in the laboratory system (see Fig.…”

Section: A Reaction Channel Selectionmentioning

confidence: 99%

“…Since the kinetic energy of the target-like product 8 Be is a function of its scattering angle in the laboratory system (see Fig. 1, top), also the maximum opening angle of the two α particles from the 8 Be breakup is a function of the original 8 Be scattering angle. This maximum opening angle is shown in Fig.…”

Section: A Reaction Channel Selectionmentioning

confidence: 99%

“…They found that, in the U(5)-limit of spherical vibrators, the population of the 2 + ms state in α-transfer reactions should be as strong as 1/3 relative to the population of the 2 + 1 state. The first candidates for 2 + ms states were claimed in the N = 84 isotones 140 Ba, 142 Ce, and 144 Sm based on the small E2/M1 multipole mixing ratio of their decays to the 2 + 1 state [8]. In the stable nuclei 142 Ce and 144 Sm, the 2 + ms states were uniquely established by measurements of their absolute B(M1) transition strengths to the 2 + 1 states [9,10].…”

Section: Introductionmentioning

confidence: 99%

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Population of the2ms+mixed-symmetry state ofBa140with theα-transfe

Stahl¹,

Leske²,

Bauer³

et al. 2015

Phys. Rev. C

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Background: Identification of proton-neutron mixed-symmetric one-quadrupole phonon excitations (the 2 + ms states) of atomic nuclei provides information on the isovector part of the residual nucleon-nucleon interaction. It was predicted that the 2 + ms state of particular nuclei close to the U (5) 140 Ba was populated by α transfer three times weaker than predicted. Another 2 + state that can be ruled out as the MSS was in turn as strongly populated by the α transfer as predicted for the MSS. Conclusions: The relative population of 2 + states by α-transfer cannot serve as a new signature for MSSs, since other 2 + states are also strongly populated. Nevertheless, the substantial population of the MSS candidate of 140 Ba by α transfer qualifies this type of reaction as suitable tool to excite MSSs and study their electromagnetic decay properties.

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Section: Methodsmentioning

confidence: 99%

Section: A Reaction Channel Selectionmentioning

confidence: 99%

Section: A Reaction Channel Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Population of the2ms+mixed-symmetry state ofBa140with theα-transfe

Stahl¹,

Leske²,

Bauer³

et al. 2015

Phys. Rev. C

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“…Clearly, a probe which gives information on the strength of this residual interaction is of high value to understand the nuclear force. In 1984 the first example of a so called quadrupole mixed-symmetry state [Pie08] was discovered in spherical nuclei by Hamilton et al [Ham84]. This excitation mode has the property to be anti-symmetry with respect to the proton-neutron degree of freedom [Hey86].…”

Section: Introductionmentioning

confidence: 99%

The Two-Photon Decay of the 11-/2 Isomer of 137Ba and Mixed-Symmetry States of 92,94Zr and 94Mo

Walz¹

2016

Springer Theses

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The first part of this thesis covers the two-photon decay of the 11 2 − isomer in 137 Ba. Clear evidence of this exotic decay mode is found, which opens up the possibility to use the twophoton decay probability as a general tool to investigate the structure of atomic nuclei. Details on the experiment are given, and the major challenges to successfully perform this difficult experiment are outlined. The two-photon decay experiment was conducted with the new LaBr 3 -detector ball which was setup from scratch in the framework of this thesis. The properties and performance of this powerful detector system -consisting of 18 large LaBr 3 -detectors -are discussed.Furthermore, proton scattering at 200 MeV has been performed on the nuclei 92,94 Zr, 94,96 Mo and 70 Zn. The measured cross sections are compared to calculations in the framework of the Quasi-Particle Phonon Model (QPM). Conclusions about the validity of the QPM results are drawn. A comparison of the excitation cross sections of the 2 + 1 states and the one-phonon quadrupole states with mixed neutron and proton symmetry (2 + ms ) allows to prove the special character of the 2 + ms states independently of electromagnetic transition strengths. The possible existence of 3 − and 4 + states with mixed proton and neutron symmetry is discussed. Furthermore the origin of collectivity of low-lying states in spherical nuclei is investigated in the QPM. Zusammenfassung

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