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Record |
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Author  |
IDS Collaboration (Lica, R. et al); Algora, A.; Nacher, E. |
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Title |
Revealing the Nature of yrast States in Neutron-Rich Polonium Isotopes |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
134 |
Issue |
5 |
Pages |
052502 - 7pp |
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Abstract |
Polonium isotopes having two protons above the shell closure at Z = 82 show a wide variety of lowlying, high-spin isomeric states across the whole chain. The structure of neutron-deficient isotopes up to 210Po (N = 126) is well established as they are easily produced through various methods. However, there is not much information available for the neutron-rich counterparts for which only selective techniques can be used for their production. We report on the first fast-timing measurements of yrast states up to the 8+ level in 214,216,218Po isotopes produced in the beta- decay of 214,216,218Bi at ISOLDE, CERN. In particular, our new half-life value of 607(14) ps for the 8+1 state in 214Po is nearly 20 times shorter than the value available in the literature and comparable with the newly measured half-lives of 409(16) and 628(25) ps for the corresponding 8+1 states in 216,218Po, respectively. The measured B(E2; 8+1 -> 6+1 ) transition probability values follow an increasing trend relative to isotope mass, reaching a maximum for 216Po. The increase contradicts the previous claims of isomerism for the 8+ yrast states in neutron-rich 214Po and beyond. Together with the other measured yrast transitions, the B(E2) values provide a crucial test of the different theoretical approaches describing the underlying configurations of the yrast band. The new experimental results are compared to shell-model calculations using the KHPE and H 208 effective interactions and their pairing-modified versions, showing an increase in configuration mixing when moving toward the heavier isotopes. |
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Address |
[Lica, R.; Costache, C.; Marginean, N.; Marginean, R.; Mihai, C.; Mihai, R. E.; Negret, A.] Horia Hulubei Natl Inst R&D Phys & Nucl Engn, RO-077125 Bucharest, Romania, Email: razvan.lica@nipne.ro |
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Publisher |
Amer Physical Soc |
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Language |
English |
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Original Title |
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Series Title |
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Series Volume |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:001452392000013 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6573 |
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