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

L Zago; A Gottardo; J.J Valiente-Dobón; G Benzoni; A Gadea; M Górska; S Lunardi; Zsolt Podolyak; P.H Regan; Zs Podolyák; D Rudolph; A Algora; G de Angelis; D Bazzacco; J Benlliure; F Camera; P Boutachkov; A Bracco; M.L Cortés; F.C.L Crespi; E Casarejos; A.M Bruce; A Corsi; C Domingo-Pardo; M Doncel; T Engert; H Geissel; J Gerl; A Goasduff; N Goel; J Grebosz; E Gregor; T Habermann; S Klupp; I Kojouharov; N Kurz; S.M Lenzi; S Leoni; S Mandal; R Menegazzo; D Mengoni; B Million; A.I Morales; D.R Napoli; F Naqvi; C Nociforo; M Pfützner; S Pietri; A Prochazka; F Recchia; E Sahin; H Schaffner; A Sharma; B Sitar; D Siwal; P Strmen; I Szarka; C.A Ur; P.M Walker; H Weick; O Wieland; H.-J Wollersheim

doi:10.1016/j.physletb.2022.137457

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

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

L Zago, A Gottardo, J.J Valiente-Dobón, G Benzoni, A Gadea, M Górska, S Lunardi, Zsolt Podolyak, P.H Regan, Zs Podolyák, …

Physics Letters B, Vol.834, 137457

10/11/2022

DOI: https://doi.org/10.1016/j.physletb.2022.137457

Abstract

Analysis

Gamma rays

Uranium

γ spectroscopy

Isomer spectroscop

High-spin spectroscopy

The nucleus ²¹²Po has been produced through the fragmentation of a ²³⁸U primary beam at 1 GeV/nucleon at GSI, separated with the FRagment Separator, FRS, and studied via isomer γ-decay spectroscopy with the RISING setup. Two delayed previously unknown γ rays have been observed. One has been attributed to the E3 decay of a 21⁻ isomeric state feeding the α-emitting 45-s (18⁺) high-spin isomer. The other γ-ray line has been assigned to the decay of a higher-lying 23⁺ metastable state. These are the first observations of high-spin states above the ²¹²Po (18⁺) isomer, by virtue of the selectivity obtained via ion-by-ion identification of ²³⁸U fragmentation products. Comparison with shell-model calculations points to shortfalls in the nuclear interactions involving high-j proton and neutron orbitals, to which the region around Z∼100 is sensitive.

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Title: High-spin states in ²¹²Po above the α-decaying (18⁺) isomer
Creators: L Zago - University of Padua
A Gottardo
J.J Valiente-Dobón - University of Cologne
G Benzoni - INFN Sezione di Milano
A Gadea
M Górska - GSI Helmholtz Centre for Heavy Ion Research
S Lunardi
Zsolt Podolyak - University of Surrey, School of Maths and Physics
P.H Regan - University of Surrey, School of Maths and Physics
Zs Podolyák - University of Surrey
D Rudolph
A Algora
G de Angelis
D Bazzacco
J Benlliure
F Camera
P Boutachkov - University of Surrey
A Bracco - INFN Sezione di Milano
M.L Cortés
F.C.L Crespi - INFN Sezione di Milano
E Casarejos
A.M Bruce - University of Brighton
A Corsi
C Domingo-Pardo
M Doncel - Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
T Engert
H Geissel
J Gerl - GSI Helmholtz Centre for Heavy Ion Research
A Goasduff
N Goel
J Grebosz
E Gregor
T Habermann
S Klupp
I Kojouharov - GSI Helmholtz Centre for Heavy Ion Research
N Kurz - TU Darmstadt
S.M Lenzi
S Leoni - GSI Helmholtz Centre for Heavy Ion Research
S Mandal
R Menegazzo - TU Darmstadt
D Mengoni - Universitat Politècnica de Catalunya
B Million - TU Darmstadt
A.I Morales - Universitat de València
D.R Napoli
F Naqvi - Yale University
C Nociforo
M Pfützner
S Pietri - GSI Helmholtz Centre for Heavy Ion Research
A Prochazka
F Recchia - Michigan State University
E Sahin - Istanbul University
H Schaffner - GSI Helmholtz Centre for Heavy Ion Research
A Sharma - University of Surrey, School of Sustainability, Civil and Environmental Engineering
B Sitar
D Siwal
P Strmen
I Szarka
C.A Ur
P.M Walker - University of Surrey, School of Maths and Physics
H Weick - GSI Helmholtz Centre for Heavy Ion Research
O Wieland - Universitat Politècnica de Catalunya
H.-J Wollersheim
Publication Details: Physics Letters B, Vol.834, 137457
Publisher: Elsevier
Date published: 10/11/2022
Date accepted: 13/09/2022
Grants: Science and Technology Facilities Council (United Kingdom, Swindon) - STFC
Istituto Nazionale di Fisica Nucleare (Italy, Rome) - INFN
Generalitat Valenciana (Spain, Valencia)
Swedish Research Council (Sweden, Stockholm) - VR
Grant note: The GSI accelerator staff are acknowledged. CloudVeneto [49] is acknowledged for the use of computing and storage facilities. The authors acknowledge the support of the Italian Istituto Nazionale di Fisica Nucleare. This work was partially supported by the Ministry of Science, and Generalitat Valenciana, Spain, under the Grants SEV-2014-0398, FPA2017-84756-C4, PID2019-104714GB-C21, PROMETEO/2019/005 and by the EU FEDER funds. The support of the UK STFC, of the Swedish Research Council under Contract No. 2008-4240 and No. 2016-3969 and of the DFG (EXC 153) is also acknowledged. The experimental activity has been partially supported by the EU under the FP6-Integrated Infrastructure Initiative EURONS, Contract No. RII3-CT-2004-506065 and FP7-Integrated Infrastructure Initiative ENSAR, Grant No. 262010.
Identifiers: 99696165302346
Academic Unit: School of Sustainability, Civil and Environmental Engineering; School of Maths and Physics
Language: English
Resource Type: Journal article

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

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