| Preprint | |
| Report number | arXiv:2407.03839 |
| Title | On the nature of yrast states in neutron-rich polonium isotopes |
| Author(s) |
Lică, R. (Bucharest, IFIN-HH) ; Andreyev, A.N. (York U., England) ; Naïdja, H. (Constantine U.) ; Blazhev, A. (Cologne U.) ; Van Duppen, P. (Leuven U.) ; Andel, B. (Comenius U.) ; Algora, A. (Valencia U., IFIC ; Debrecen, Inst. Nucl. Res.) ; Antalic, S. (Comenius U.) ; Benito, J. (Madrid U.) ; Benzoni, G. (INFN, Milan) ; Berry, T. (Surrey U.) ; Borge, M.J.G. (CSIC, Madrid) ; Costache, C. (Bucharest, IFIN-HH) ; Cubiss, J.G. (York U., England) ; De Witte, H. (Leuven U.) ; Fraile, L.M. (Madrid U.) ; Fynbo, H.O.U. (Aarhus U.) ; Greenlees, P.T. (Jyvaskyla U.) ; Harkness-Brennan, L.J. (Liverpool U.) ; Huyse, M. (Leuven U.) ; Illana, A. (INFN, Legnaro) ; Jolie, J. (Cologne U.) ; Judson, D.S. (Liverpool U.) ; Konki, J. (Jyvaskyla U.) ; Lazarus, I. (Daresbury) ; Madurga, M. (U. Tennessee, Knoxville) ; Marginean, N. (Bucharest, IFIN-HH) ; Marginean, R. ; Mihai, C. (Bucharest, IFIN-HH) ; Mihai, R.E. (Bucharest, IFIN-HH) ; Mosat, P. (Bucharest, IFIN-HH ; Comenius U.) ; Murias, J.R. (Madrid U. ; Laue-Langevin Inst.) ; Nacher, E. (Valencia U., IFIC) ; Negret, A. (Bucharest, IFIN-HH) ; Page, R.D. (Liverpool U.) ; Perea, A. (CSIC, Madrid) ; Pucknell, V. (Daresbury) ; Rahkila, P. (Jyvaskyla U.) ; Rezynkina, K. (Leuven U. ; Strasbourg, IPHC) ; Sánchez-Tembleque, V. (Madrid U.) ; Schomacker, K. (Cologne U.) ; Stryjczyk, M. (Leuven U. ; Jyvaskyla U.) ; Sürder, C. (Darmstadt, Tech. U.) ; Tengblad, O. (CSIC, Madrid) ; Vedia, V. (Madrid U.) ; Warr, N. (Cologne U.) |
| Imprint | 2024-07-04 |
| Number of pages | 6 |
| Note | 6 pages, 5 figures (main manuscript), 2 pages (supplemental material) |
| Subject category | nucl-th ; Nuclear Physics - Theory ; nucl-ex ; Nuclear Physics - Experiment |
| Accelerator/Facility, Experiment | CERN ISOLDE |
| Abstract | Polonium isotopes having two protons above the shell closure at $Z=82$ show a wide variety of low-lying high-spin isomeric states across the whole chain. The structure of neutron-deficient isotopes up to $^{210}$Po ($N=126$) 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 $^{214,216,218}$Po isotopes produced in the $\beta^-$ decay of $^{214,216,218}$Bi at ISOLDE, CERN. In particular, our new half-life value of 607(14) ps for the 8$_1^+$ state in $^{214}$Po is nearly 20 times shorter than the one available in literature and comparable with the newly measured half-lives of 409(16) and 628(25) ps for the corresponding 8$_1^+$ states in $^{216,218}$Po, respectively. The measured $B(E2;8_1^+ \to 6_1^+)$ transition probability values follow an increasing trend relative to isotope mass, reaching a maximum for $^{216}$Po. The increase contradicts the previous claims of isomerism for the $8^+$ yrast states in neutron-rich $^{214}$Po 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 H208 effective interactions and their pairing modified versions, showing an increase in configuration mixing when moving towards the heavier isotopes. |
| Other source | Inspire |
| Copyright/License | preprint: (License: CC BY 4.0) |
Record created 2024-07-18, last modified 2024-11-20