Reinterpretation of excited states in <sup>212</sup>Po: Shell-model multiplets rather than α-cluster states

Fernández, A.; Jungclaus, A.; Golubev, P.; Rudolph, D.; Sarmiento, L. G.; Gargano, A.; Naïdja, H.; Astier, A.; Dupont, E.; Gadea, A.; Nácher, E.; Perea, A.; Wimmer, K.; Clément, E.; Fremont, G.; Goupil, J.; Houarner, C.; Jacquot, B.; Korichi, A.; Lemasson, A.; Li, H. J.; Ljungvall, J.; Ménager, L.; Pérez-Vidal, R. M.; Petrache, C. M.; Ralet, D.; Ropert, J. A.; Saillant, F.; Såmark-Roth, A.; Simpson, G. S.; Spitaels, C.; Zielinska, M.; Ansari, S.; Dudouet, J.; Illana, A.; Jurado, M.; Kocheva, D.; Lalović, N.; Lorenz, Ch.; Quintana, B.; Rainovski, G.; Redon, N.; Tocabens, G.; Barrientos, D.; Benzoni, G.; Birkenbach, B.; Boston, A. J.; Boston, H. C.; Bracco, A.; Ciemala, M.

Reinterpretation of excited states in ²¹²Po: Shell-model multiplets rather than α-cluster states

Mark

Fernández, A. ; Jungclaus, A. ; Golubev, P. ^LU ; Rudolph, D. ^LU

; Sarmiento, L. G. ^LU ; Gargano, A. ; Naïdja, H. ; Astier, A. ; Dupont, E. and Gadea, A. , et al. (2021) In Physical Review C 104(5).

Abstract: A γ-ray spectroscopic study of ²¹²Po was performed at the Grand Accélérateur National d'Ions Lourds, using the inverse kinematics α-transfer reaction ¹²C(²⁰⁸Pb,²¹²Po)⁸Be and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1⁻ and 2⁻ and excitation energies below 2.1 MeV, which have been predicted by recent α-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of ²¹²Po with... (More); A γ-ray spectroscopic study of ²¹²Po was performed at the Grand Accélérateur National d'Ions Lourds, using the inverse kinematics α-transfer reaction ¹²C(²⁰⁸Pb,²¹²Po)⁸Be and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1⁻ and 2⁻ and excitation energies below 2.1 MeV, which have been predicted by recent α-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of ²¹²Po with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4⁻), 1751 (8⁻), 1787 (6⁻), 1946 (4⁻), 1986 (8⁻), and 2016 (6⁻) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of ²¹²Po is supported by experimental information with respect to the linear polarization of γ rays, which suggests a magnetic character of the 432-keV γ ray decaying from the state at an excitation energy of 1787 keV to the 6⁺ yrast state, and exclusive reaction cross sections. (Less)

Please use this url to cite or link to this publication: https://lup.lub.lu.se/record/cb338118-7cd1-4eee-8456-72f1dc024314

author

Fernández, A. ; Jungclaus, A. ; Golubev, P. ^LU ; Rudolph, D. ^LU

; Sarmiento, L. G. ^LU ; Gargano, A. ; Naïdja, H. ; Astier, A. ; Dupont, E. and Gadea, A. , et al. (More)

Fernández, A. ; Jungclaus, A. ; Golubev, P. ^LU ; Rudolph, D. ^LU

; Sarmiento, L. G. ^LU ; Gargano, A. ; Naïdja, H. ; Astier, A. ; Dupont, E. ; Gadea, A. ; Nácher, E. ; Perea, A. ; Wimmer, K. ; Clément, E. ; Fremont, G. ; Goupil, J. ; Houarner, C. ; Jacquot, B. ; Korichi, A. ; Lemasson, A. ; Li, H. J. ; Ljungvall, J. ; Ménager, L. ; Pérez-Vidal, R. M. ; Petrache, C. M. ; Ralet, D. ; Ropert, J. A. ; Saillant, F. ; Såmark-Roth, A. ^LU ; Simpson, G. S. ; Spitaels, C. ; Zielinska, M. ; Ansari, S. ; Dudouet, J. ; Illana, A. ; Jurado, M. ; Kocheva, D. ; Lalović, N. ^LU

; Lorenz, Ch. ^LU

; Quintana, B. ; Rainovski, G. ; Redon, N. ; Tocabens, G. ; Barrientos, D. ; Benzoni, G. ; Birkenbach, B. ; Boston, A. J. ; Boston, H. C. ; Bracco, A. ; Ciemala, M. ; Collado, J. ; Cullen, D. M. ; Domingo-Pardo, C. ; Eberth, J. ; González, V. ; Harkness-Brennan, L. J. ; Hess, H. ; Judson, D. S. ; Korten, W. ; Leoni, S. ; Maj, A. ; Menegazzo, R. ; Mengoni, D. ; Michelagnoli, C. ; Million, B. ; Napoli, D. R. ; Nyberg, J. ; Podolyak, Zs. ; Pullia, A. ; Reiter, P. ; Sanchis, E. ; Stezowski, O. ; Theisen, Ch. and Valiente-Dobón, J. J. (Less)

organization

Nuclear physics

publishing date

2021-11-29

type

Contribution to journal

publication status

published

subject

Subatomic Physics

keywords

nuclear structure, shell-model calculations, alpha cluster states, AGATA, linear polarisation

in

Physical Review C

volume

104

issue

5

article number

054316

pages

19 pages

publisher

American Physical Society

external identifiers

scopus:85120539860

ISSN

2469-9985

DOI

10.1103/PhysRevC.104.054316

project

Nuclear Structure at the Limits: Isotope-selective Spectroscopy

language

English

LU publication?

yes

id

cb338118-7cd1-4eee-8456-72f1dc024314

date added to LUP

2021-11-30 18:49:39

date last changed

2023-08-30 06:38:07

@article{cb338118-7cd1-4eee-8456-72f1dc024314,
  abstract     = {{A γ-ray spectroscopic study of <sup>212</sup>Po was performed at the Grand Accélérateur National d'Ions Lourds, using the inverse kinematics α-transfer reaction <sup>12</sup>C(<sup>208</sup>Pb,<sup>212</sup>Po)<sup>8</sup>Be and the AGATA spectrometer. A careful analysis based on γγ coincidence relations allowed us to establish 14 new excited states in the energy range between 1.9 and 3.3 MeV. None of these states, however, can be considered as candidates for the levels with spins and parities of 1<sup>−</sup> and 2<sup>−</sup> and excitation energies below 2.1 MeV, which have been predicted by recent α-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of <sup>212</sup>Po with shell-model calculations was performed. This comparison suggests that the six states with excitation energies (spins and parities) of 1744 (4<sup>−</sup>), 1751 (8<sup>−</sup>), 1787 (6<sup>−</sup>), 1946 (4<sup>−</sup>), 1986 (8<sup>−</sup>), and 2016 (6<sup>−</sup>) keV, which previously were interpreted as α-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of <sup>212</sup>Po is supported by experimental information with respect to the linear polarization of γ rays, which suggests a magnetic character of the 432-keV γ ray decaying from the state at an excitation energy of 1787 keV to the 6<sup>+</sup> yrast state, and exclusive reaction cross sections.}},
  author       = {{Fernández, A. and Jungclaus, A. and Golubev, P. and Rudolph, D. and Sarmiento, L. G. and Gargano, A. and Naïdja, H. and Astier, A. and Dupont, E. and Gadea, A. and Nácher, E. and Perea, A. and Wimmer, K. and Clément, E. and Fremont, G. and Goupil, J. and Houarner, C. and Jacquot, B. and Korichi, A. and Lemasson, A. and Li, H. J. and Ljungvall, J. and Ménager, L. and Pérez-Vidal, R. M. and Petrache, C. M. and Ralet, D. and Ropert, J. A. and Saillant, F. and Såmark-Roth, A. and Simpson, G. S. and Spitaels, C. and Zielinska, M. and Ansari, S. and Dudouet, J. and Illana, A. and Jurado, M. and Kocheva, D. and Lalović, N. and Lorenz, Ch. and Quintana, B. and Rainovski, G. and Redon, N. and Tocabens, G. and Barrientos, D. and Benzoni, G. and Birkenbach, B. and Boston, A. J. and Boston, H. C. and Bracco, A. and Ciemala, M. and Collado, J. and Cullen, D. M. and Domingo-Pardo, C. and Eberth, J. and González, V. and Harkness-Brennan, L. J. and Hess, H. and Judson, D. S. and Korten, W. and Leoni, S. and Maj, A. and Menegazzo, R. and Mengoni, D. and Michelagnoli, C. and Million, B. and Napoli, D. R. and Nyberg, J. and Podolyak, Zs. and Pullia, A. and Reiter, P. and Sanchis, E. and Stezowski, O. and Theisen, Ch. and Valiente-Dobón, J. J.}},
  issn         = {{2469-9985}},
  keywords     = {{nuclear structure; shell-model calculations; alpha cluster states; AGATA; linear polarisation}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{5}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review C}},
  title        = {{Reinterpretation of excited states in <sup>212</sup>Po: Shell-model multiplets rather than α-cluster states}},
  url          = {{https://lup.lub.lu.se/search/files/110358063/PhysRevC.104.054316.pdf}},
  doi          = {{10.1103/PhysRevC.104.054316}},
  volume       = {{104}},
  year         = {{2021}},
}

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Reinterpretation of excited states in ²¹²Po: Shell-model multiplets rather than α-cluster states