Identification of the one-quadrupole phonon 2 1 , m s + state of 204 Hg

doi:10.1016/j.physletb.2017.04.032

Title: Identification of the one-quadrupole phonon $2_{1, m s}^{+}$ state of 204 Hg

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Abstract

One-phonon states of vibrational nuclei with mixed proton–neutron symmetry have been observed throughout the nuclear chart besides the mass A ≈ 200 region. Very recently, it has been proposed that the 2 ⁺ ₂ state of ²¹²Po is of isovector nature. This nucleus has two valence protons and two valence neutrons outside the doubly-magic ²⁰⁸Pb nucleus. The stable isotope ²⁰⁴Hg, featuring two valence-proton and valence-neutron holes, with respect to ²⁰⁸Pb, is the particle-hole mirror of ²¹²Po. In order to compare the properties of low-lying isovector excitations in these particle-hole mirror nuclei, we have studied ²⁰⁴Hg by using the projectile Coulomb-excitation technique. The measured absolute B( M1;2 ⁺ ₂ → 2 ⁺ ₁) strength of 0.20 (2) μ ² _N indicates that the 2 ⁺ ₂ level of ²⁰⁴Hg is at least the main fragment of the 2 ⁺ _1,ms state. For the first time in this mass region, both lowest-lying, one-quadrupole phonon excitations are established together with the complete set of their decay strengths. In conclusion, this allows for a microscopic description of their structures, achieved in the framework of the Quasi-particle Phonon Model.

Authors:

Stegmann, R.; Stahl, C.; Rainovski, G.; Pietralla, N.;

; Carpenter, M. P.; Janssens, R. V. F.; Lettmann, M.; Möller, T.; Möller, O.; Werner, V.; Zhu, S.

Publication Date:: 2017-07-01

Research Org.:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

OSTI Identifier:: 1352288

Alternate Identifier(s):: OSTI ID: 1389632

Grant/Contract Number:: AC02-06CH11357

Resource Type:: Published Article

Journal Name:: Physics Letters B

Additional Journal Information:: Journal Name: Physics Letters B Journal Volume: 770 Journal Issue: C; Journal ID: ISSN 0370-2693

Publisher:: Elsevier

Country of Publication:: Netherlands

Language:: English

Subject:: 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; γ ray spectroscopy; Coulomb excitation; Quadrupole collectivity; Isospin degree of freedom; Shell structure

Citation Formats


                    Stegmann, R., Stahl, C., Rainovski, G., Pietralla, N., Stoyanov, C., Carpenter, M. P., Janssens, R. V. F., Lettmann, M., Möller, T., Möller, O., Werner, V., and Zhu, S. Identification of the one-quadrupole phonon 2 1 , m s + state of 204 Hg.  Netherlands: N. p., 2017. 
        Web.  doi:10.1016/j.physletb.2017.04.032.

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                    Stegmann, R., Stahl, C., Rainovski, G., Pietralla, N., Stoyanov, C., Carpenter, M. P., Janssens, R. V. F., Lettmann, M., Möller, T., Möller, O., Werner, V., & Zhu, S. Identification of the one-quadrupole phonon 2 1 , m s + state of 204 Hg.  Netherlands.  doi:10.1016/j.physletb.2017.04.032.

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                    Stegmann, R., Stahl, C., Rainovski, G., Pietralla, N., Stoyanov, C., Carpenter, M. P., Janssens, R. V. F., Lettmann, M., Möller, T., Möller, O., Werner, V., and Zhu, S. Sat .  
        "Identification of the one-quadrupole phonon 2 1 , m s + state of 204 Hg".  Netherlands.  doi:10.1016/j.physletb.2017.04.032.

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@article{osti_1352288,

  title        = {Identification of the one-quadrupole phonon 2 1 , m s + state of 204 Hg},

  author       = {Stegmann, R. and Stahl, C. and Rainovski, G. and Pietralla, N. and Stoyanov, C. and Carpenter, M. P. and Janssens, R. V. F. and Lettmann, M. and Möller, T. and Möller, O. and Werner, V. and Zhu, S.},

  abstractNote = {One-phonon states of vibrational nuclei with mixed proton–neutron symmetry have been observed throughout the nuclear chart besides the mass A ≈ 200 region. Very recently, it has been proposed that the 2+2 state of 212Po is of isovector nature. This nucleus has two valence protons and two valence neutrons outside the doubly-magic 208Pb nucleus. The stable isotope 204Hg, featuring two valence-proton and valence-neutron holes, with respect to 208Pb, is the particle-hole mirror of 212Po. In order to compare the properties of low-lying isovector excitations in these particle-hole mirror nuclei, we have studied 204Hg by using the projectile Coulomb-excitation technique. The measured absolute B(M1;2+2 → 2+1) strength of 0.20 (2) μ2N indicates that the 2+2 level of 204Hg is at least the main fragment of the 2+1,ms state. For the first time in this mass region, both lowest-lying, one-quadrupole phonon excitations are established together with the complete set of their decay strengths. In conclusion, this allows for a microscopic description of their structures, achieved in the framework of the Quasi-particle Phonon Model.},

  doi          = {10.1016/j.physletb.2017.04.032},

  journal      = {Physics Letters B},

  number       = C,

  volume       = 770,

  place        = {Netherlands},

  year         = {2017},

  month        = {7}

}

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Title: Identification of the one-quadrupole phonon 2 1 , m s + state of 204 Hg

Abstract

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Title: Identification of the one-quadrupole phonon $2_{1, m s}^{+}$ state of 204 Hg