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

A. Fernández; A. Jungclaus; P. Golubev; D. Rudolph; L. G. Sarmiento; A. Gargano; H. Naïdja; A. Astier; E. Dupont; A. Gadea; E. Nácher; A. Perea; K. Wimmer; E. Clément; G. Fremont; J. Goupil; C. Houarner; B. Jacquot; A. Korichi; A. Lemasson; H. J. Li; J. Ljungvall; L. Ménager; R. M. Pérez-Vidal; C. M. Petrache; D. Ralet; J. A. Ropert; F. Saillant; A. Såmark-Roth; G. S. Simpson; C. Spitaels; M. Zielinska; S. Ansari; J. Dudouet; A. Illana; M. Jurado; D. Kocheva; N. Lalović; Ch. Lorenz; B. Quintana; G. Rainovski; N. Redon; G. Tocabens; D. Barrientos; G. Benzoni; B. Birkenbach; A. J. Boston; H. C. Boston; A. Bracco; M. Ciemala; J. Collado; D. M. Cullen; C. Domingo-Pardo; J. Eberth; V. González; L. J. Harkness-Brennan; H. Hess; D. S. Judson; W. Korten; S. Leoni; A. Maj; R. Menegazzo; D. Mengoni; C. Michelagnoli; B. Million; D. R. Napoli; J. Nyberg; Zs. Podolyak; A. Pullia; P. Reiter; E. Sanchis; O. Stezowski; Ch. Theisen; J. J. Valiente-Dobón

doi:10.1103/PhysRevC.104.054316

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

A. Fernández, A. Jungclaus, P. Golubev, D. Rudolph, L. G. Sarmiento, A. Gargano, H. Naïdja, A. Astier, E. Dupont, A. Gadea, E. Nácher, A. Perea, K. Wimmer, E. Clément, G. Fremont, J. Goupil, C. Houarner, B. Jacquot, A. Korichi, A. LemassonH. J. Li, J. Ljungvall, L. Ménager, R. M. Pérez-Vidal, C. M. Petrache, D. Ralet, J. A. Ropert, F. Saillant, A. Såmark-Roth, G. S. Simpson, C. Spitaels, M. Zielinska, S. Ansari, J. Dudouet, A. Illana, M. Jurado, D. Kocheva, N. Lalović, Ch. Lorenz, B. Quintana, G. Rainovski, N. Redon, G. Tocabens, D. Barrientos, G. Benzoni, B. Birkenbach, A. J. Boston, H. C. Boston, A. Bracco, M. Ciemala, J. Collado, D. M. Cullen, C. Domingo-Pardo, J. Eberth, V. González, L. J. Harkness-Brennan, H. Hess, D. S. Judson, W. Korten, S. Leoni, A. Maj, R. Menegazzo, D. Mengoni, C. Michelagnoli, B. Million, D. R. Napoli, J. Nyberg, Zs. Podolyak, A. Pullia, P. Reiter, E. Sanchis, O. Stezowski, Ch. Theisen, J. J. Valiente-Dobón

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Sammanfattning

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.

Originalspråk	engelska
Artikelnummer	054316
Antal sidor	19
Tidskrift	Physical Review C
Volym	104
Nummer	5
DOI	https://doi.org/10.1103/PhysRevC.104.054316
Status	Published - 2021 nov. 29

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6 Artikel i vetenskaplig tidskrift

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Kärnstruktur vid stabilitetsgränsen: Spektroskopi av särskilda isotoper
Rudolph, D. (PI), Fahlander, C. (CoI), Golubev, P. (CoI), Sarmiento Pico, L. (CoI), Cox, D. (Forskare), Hrabar, Y. (Forskarstuderande), Såmark-Roth, A. (Forskarstuderande), Forsberg, U. (Forskare), Lorenz, C. (Forskarstuderande), Lalovic, N. (Forskare), Lalovic, N. (Forskarstuderande), Forsberg, U. (Forskarstuderande), Gellanki, J. (Forskarstuderande), Hoischen, R. (Forskarstuderande), Johansson, E. (Forskarstuderande), Andersson, L.-L. (Forskarstuderande), du Rietz, R. (Forskarstuderande), Ekman, J. (Forskarstuderande) & Andreoiu, C. (Forskarstuderande)
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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., ... Valiente-Dobón, J. J. (2021). Reinterpretation of excited states in ²¹²Po: Shell-model multiplets rather than α-cluster states. Physical Review C, 104(5), Artikel 054316. https://doi.org/10.1103/PhysRevC.104.054316

@article{cb3381187cd14eee845672f1dc024314,

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

abstract = "A γ-ray spectroscopic study of 212Po was performed at the Grand Acc{\'e}l{\'e}rateur 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.",

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

author = "A. Fern{\'a}ndez and A. Jungclaus and P. Golubev and D. Rudolph and Sarmiento, {L. G.} and A. Gargano and H. Na{\"i}dja and A. Astier and E. Dupont and A. Gadea and E. N{\'a}cher and A. Perea and K. Wimmer and E. Cl{\'e}ment and G. Fremont and J. Goupil and C. Houarner and B. Jacquot and A. Korichi and A. Lemasson and Li, {H. J.} and J. Ljungvall and L. M{\'e}nager and P{\'e}rez-Vidal, {R. M.} and Petrache, {C. M.} and D. Ralet and Ropert, {J. A.} and F. Saillant and A. S{\aa}mark-Roth and Simpson, {G. S.} and C. Spitaels and M. Zielinska and S. Ansari and J. Dudouet and A. Illana and M. Jurado and D. Kocheva and N. Lalovi{\'c} and Ch. Lorenz and B. Quintana and G. Rainovski and N. Redon and G. Tocabens and D. Barrientos and G. Benzoni and B. Birkenbach and Boston, {A. J.} and Boston, {H. C.} and A. Bracco and M. Ciemala and J. Collado and Cullen, {D. M.} and C. Domingo-Pardo and J. Eberth and V. Gonz{\'a}lez and Harkness-Brennan, {L. J.} and H. Hess and Judson, {D. S.} and W. Korten and S. Leoni and A. Maj and R. Menegazzo and D. Mengoni and C. Michelagnoli and B. Million and Napoli, {D. R.} and J. Nyberg and Zs. Podolyak and A. Pullia and P. Reiter and E. Sanchis and O. Stezowski and Ch. Theisen and Valiente-Dob{\'o}n, {J. J.}",

year = "2021",

month = nov,

day = "29",

doi = "10.1103/PhysRevC.104.054316",

language = "English",

volume = "104",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "5",

}

Fernández, A, Jungclaus, A, Golubev, P , Rudolph, D , Sarmiento, LG, 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, HJ, Ljungvall, J, Ménager, L, Pérez-Vidal, RM, Petrache, CM, Ralet, D, Ropert, JA, Saillant, F, Såmark-Roth, A, Simpson, GS, Spitaels, C, Zielinska, M, Ansari, S, Dudouet, J, Illana, A, Jurado, M, Kocheva, D, Lalović, N, Lorenz, C, Quintana, B, Rainovski, G, Redon, N, Tocabens, G, Barrientos, D, Benzoni, G, Birkenbach, B, Boston, AJ, Boston, HC, Bracco, A, Ciemala, M, Collado, J, Cullen, DM, Domingo-Pardo, C, Eberth, J, González, V, Harkness-Brennan, LJ, Hess, H, Judson, DS, Korten, W, Leoni, S, Maj, A, Menegazzo, R, Mengoni, D, Michelagnoli, C, Million, B, Napoli, DR, Nyberg, J, Podolyak, Z, Pullia, A, Reiter, P, Sanchis, E, Stezowski, O, Theisen, C & Valiente-Dobón, JJ 2021, 'Reinterpretation of excited states in ²¹²Po: Shell-model multiplets rather than α-cluster states', Physical Review C, vol. 104, nr. 5, 054316. https://doi.org/10.1103/PhysRevC.104.054316

TY - JOUR

T1 - Reinterpretation of excited states in 212Po: Shell-model multiplets rather than α-cluster states

AU - Fernández, A.

AU - Jungclaus, A.

AU - Golubev, P.

AU - Rudolph, D.

AU - Sarmiento, L. G.

AU - Gargano, A.

AU - Naïdja, H.

AU - Astier, A.

AU - Dupont, E.

AU - Gadea, A.

AU - Nácher, E.

AU - Perea, A.

AU - Wimmer, K.

AU - Clément, E.

AU - Fremont, G.

AU - Goupil, J.

AU - Houarner, C.

AU - Jacquot, B.

AU - Korichi, A.

AU - Lemasson, A.

AU - Li, H. J.

AU - Ljungvall, J.

AU - Ménager, L.

AU - Pérez-Vidal, R. M.

AU - Petrache, C. M.

AU - Ralet, D.

AU - Ropert, J. A.

AU - Saillant, F.

AU - Såmark-Roth, A.

AU - Simpson, G. S.

AU - Spitaels, C.

AU - Zielinska, M.

AU - Ansari, S.

AU - Dudouet, J.

AU - Illana, A.

AU - Jurado, M.

AU - Kocheva, D.

AU - Lalović, N.

AU - Lorenz, Ch.

AU - Quintana, B.

AU - Rainovski, G.

AU - Redon, N.

AU - Tocabens, G.

AU - Barrientos, D.

AU - Benzoni, G.

AU - Birkenbach, B.

AU - Boston, A. J.

AU - Boston, H. C.

AU - Bracco, A.

AU - Ciemala, M.

AU - Collado, J.

AU - Cullen, D. M.

AU - Domingo-Pardo, C.

AU - Eberth, J.

AU - González, V.

AU - Harkness-Brennan, L. J.

AU - Hess, H.

AU - Judson, D. S.

AU - Korten, W.

AU - Leoni, S.

AU - Maj, A.

AU - Menegazzo, R.

AU - Mengoni, D.

AU - Michelagnoli, C.

AU - Million, B.

AU - Napoli, D. R.

AU - Nyberg, J.

AU - Podolyak, Zs.

AU - Pullia, A.

AU - Reiter, P.

AU - Sanchis, E.

AU - Stezowski, O.

AU - Theisen, Ch.

AU - Valiente-Dobón, J. J.

PY - 2021/11/29

Y1 - 2021/11/29

N2 - 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.

AB - 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.

KW - nuclear structure

KW - shell-model calculations

KW - alpha cluster states

KW - AGATA

KW - linear polarisation

U2 - 10.1103/PhysRevC.104.054316

DO - 10.1103/PhysRevC.104.054316

M3 - Article

SN - 2469-9985

VL - 104

JO - Physical Review C

JF - Physical Review C

IS - 5

M1 - 054316

ER -

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

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Ämnesklassifikation (UKÄ)

Tillgång till dokument

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Forskningsoutput

α decay of the neutron-deficient isotope 190At

High-spin states in 212Po above the α-decaying (18+) isomer

Physics opportunities with the Advanced Gamma Tracking Array: AGATA

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Kärnstruktur vid stabilitetsgränsen: Spektroskopi av särskilda isotoper

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Platform for Advanced Radiaton Detectors

Citera det här

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

α decay of the neutron-deficient isotope ¹⁹⁰At

High-spin states in ²¹²Po above the α-decaying (18⁺) isomer