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

A. Fernandez; A. Jungclaus; P. Golubev; D. Rudolph; L. G. Sarmiento; A. Gargano; H. Naidja; A. Astier; E. Dupont; A. Gadea; E. Nacher; A. Perea; K. Wimmer; E. Clement; G. Fremont; J. Goupil; C. Houarner; B. Jacquot; A. Korichi; A. Lemasson; H. J. Li; J. Ljungvall; L. Menager; R. M. Perez-Vidal; C. M. Petrache; D. Ralet; J. A. Ropert; F. Saillant; A. Samark-Roth; G. S. Simpson; C. Spitaels; M. Zielinska; S. Ansari; J. Dudouet; A. Illana; M. Jurado; D. Kocheva; 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; Gonzalez; 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-Dobon

doi:10.1103/PhysRevC.104.054316

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

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

A. Fernandez, A. Jungclaus, P. Golubev, D. Rudolph, L. G. Sarmiento, A. Gargano, H. Naidja, A. Astier, E. Dupont, A. Gadea, …

Physical review. C, Vol.104(5), 054316

29/11/2021

DOI: https://doi.org/10.1103/PhysRevC.104.054316

Abstract

Physics, Nuclear

Science & Technology

Physical Sciences

Physics

A gamma-ray spectroscopic study of Po-212 was performed at the Grand Accelerateur National d'Ions Lourds, using the inverse kinematics alpha-transfer reaction C-12(Pb-208, Po-212) Be-8 and the AGATA spectrometer. A careful analysis based on gamma gamma 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 alpha-cluster model calculations. A systematic comparison of the experimentally established excitation scheme of Po-212 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 alpha-cluster states, may in fact be of positive parity and belong to low-lying shell-model multiplets. This reinterpretation of the structure of Po-212 is supported by experimental information with respect to the linear polarization of gamma rays, which suggests a magnetic character of the 432-keV gamma ray decaying from the state at an excitation energy of 1787 keV to the 6(1)(+) yrast state, and exclusive reaction cross sections.

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Title: Reinterpretation of excited states in Po-212: Shell-model multiplets rather than alpha-cluster states
Creators: A. Fernandez - CSIC, Inst Estruct Mat, E-28006 Madrid, Spain
A. Jungclaus - CSIC, Inst Estruct Mat, E-28006 Madrid, Spain
P. Golubev - Lund University
D. Rudolph - Lund University
L. G. Sarmiento - Lund University
A. Gargano - Complesso Univ Monte S Angelo, Ist Nazl Fis Nucl, I-80126 Naples, Italy
H. Naidja - Univ Constantine 1, Lab Phys Math & Subatom LPMPS, Constantine 25000, Algeria
A. Astier - Université Paris-Saclay
E. Dupont - Université Paris-Saclay
A. Gadea - Universitat de València
E. Nacher - CSIC, Inst Estruct Mat, E-28006 Madrid, Spain
A. Perea - CSIC, Inst Estruct Mat, E-28006 Madrid, Spain
K. Wimmer - CSIC, Inst Estruct Mat, E-28006 Madrid, Spain
E. Clement - BP
G. Fremont - BP
J. Goupil - BP
C. Houarner - CEAIDRF CNRS IIN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 05, France
B. Jacquot - BP
A. Korichi - Université Paris-Saclay
A. Lemasson - BP
H. J. Li - CEAIDRF CNRS IIN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 05, France
J. Ljungvall - Université Paris-Saclay
L. Menager - CEAIDRF CNRS IIN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 05, France
R. M. Perez-Vidal - Universitat de València
C. M. Petrache - Université Paris-Saclay
D. Ralet - BP
J. A. Ropert - CEAIDRF CNRS IIN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 05, France
F. Saillant - CEAIDRF CNRS IIN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 05, France
A. Samark-Roth - Lund University
G. S. Simpson - Institut National de Physique Nucléaire et de Physique des Particules
C. Spitaels - CEAIDRF CNRS IIN2P3, GANIL, Bd Henri Becquerel,BP 55027, F-14076 Caen 05, France
M. Zielinska - Université Paris-Saclay
S. Ansari - Université Paris-Saclay
J. Dudouet - Institut National de Physique Nucléaire et de Physique des Particules
A. Illana - KU Leuven
M. Jurado - Universitat de València
D. Kocheva - Sofia University "St. Kliment Ohridski"
Ch Lorenz - Lund University
B. Quintana - Universidad de Salamanca
G. Rainovski - Sofia University "St. Kliment Ohridski"
N. Redon - Institut National de Physique Nucléaire et de Physique des Particules
G. Tocabens - Université Paris-Saclay
D. Barrientos - CERN, CH-1211 Geneva 23, Switzerland
G. Benzoni - Mylan
B. Birkenbach - University of Cologne
A. J. Boston - University of Liverpool
H. C. Boston - University of Liverpool
A. Bracco - Mylan
M. Ciemala - Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
J. Collado - Universitat de València
D. M. Cullen - University of Manchester
C. Domingo-Pardo - Universitat de València
J. Eberth - University of Cologne
Gonzalez - Universitat de València
L. J. Harkness-Brennan - University of Liverpool
H. Hess - University of Cologne
D. S. Judson - University of Liverpool
W. Korten - Université Paris-Saclay
S. Leoni - Mylan
A. Maj - Polish Acad Sci, Henryk Niewodniczanski Inst Nucl Phys, PL-31342 Krakow, Poland
R. Menegazzo - Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
D. Mengoni - Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
C. Michelagnoli - Inst Laue Langevin, Grenoble, France
B. Million - Mylan
D. R. Napoli - Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy
J. Nyberg - Uppsala University
Zs Podolyak - University of Surrey
A. Pullia - Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy
P. Reiter - University of Cologne
E. Sanchis - Universitat de València
O. Stezowski - Institut National de Physique Nucléaire et de Physique des Particules
Ch Theisen - Université Paris-Saclay
J. J. Valiente-Dobon - Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy
Publication Details: Physical review. C, Vol.104(5), 054316
Publisher: Amer Physical Soc
Number of pages: 19
Publication Date: 29/11/2021
Grant note: FEDER funds; European Union (EU) PROMETEO/2019/005 / Generalitat Valenciana; Center for Forestry Research & Experimentation (CIEF) 05P18PKFN9; 05P19PKFNA / German BMBF; Federal Ministry of Education & Research (BMBF) FPA2014-57196-C5; FPA2017-84756-C4; SEV-2014-0398 / Spanish Ministerio de Ciencia, Inovacion y Universidades VR 2016-3969 / Swedish Research Council (Vetenskapsradet); Swedish Research Council 654002 / European Union's Horizon 2020 research and innovation programme; Horizon 2020
Identifiers: 99822609402346; WOS:000726014300010
Academic Unit: School of Maths and Physics
Language: English
Resource Type: Journal article

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

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