High-spin shell model states in neutron-rich Sn isotopes

11th International Spring Seminar on Nuclear Physics: Shell Model and Nuclear Structure – achievements of the past two decades

Iskra, L.W.^1 ; Broda, R.^1 ; Janssens, R.V.F.^2 ; Wrzesiski, J.^1 ; Szpak, B.^1 ; Chiara, C.J.^2,3 ; Carpenter, M.P.^2 ; Fornal, B.^1 ; Hoteling, N.^2,3 ; Kondev, F.G.^4 ; Królas, W.^1 ; Lauritsen, T.^2 ; Pawlat, T.^1 ; Seweryniak, D.^2 ; Stefanescu, I.^2,3 ; Walters, W.B.^3 ; Zhu, S.^2

Institute of Nuclear Physics, Polish Academy of Sciences, Krakow

PL-31-342, Poland^1

Physics Division, Argonne National Laboratory, Argonne

IL

60439, United States^2

Department of Chemistry and Biochemistry, University of Maryland, College Park

MD

20742, United States^3

Nuclear Engineering Division, Argonne National Laboratory, Argonne

IL

60439, United States^4

关键词: Fusion-Fission;    High spin state;    High spins;    Isomeric transition;    Level schemes;    Mass numbers;    Shell models;    Transition probabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/580/1/012037/pdf
DOI  :  10.1088/1742-6596/580/1/012037

来源: IOP

【 摘 要 】

High-spin states with the seniority v ≥ 2 have been investigated in the neutron-rich118,120,122,124,126Sn isotopes. They were produced in fusion-fission processes following48Ca +208Pb,48Ca +238U reactions and via fission of target nuclei in the64Ni +238U system. By employing techniques of delayed- and cross-coincidences, it was possible to establish level schemes up to an 8 MeV excitation energy. The 13-and 15-states were identified as being isomeric and their half-lives were determined. The reduced transition probabilities extracted for isomeric transitions behave very regularly with the mass number A. The spin-parity values assigned to or suggested for the identified states were supported by shell-model calculations and by systematics.