Лаборатория ядерных реакций им. Г.Н. Флерова

Общелабораторный семинар

Дата и время: вторник, 18 декабря 2018 г., в 15:30

Место: Конференц-зал, Лаборатория ядерных реакций им. Г.Н. Флерова

Тема семинара: «Towards limits of existence of nuclear spieces with EXPERTs»

Докладчики: И. Муха, О. Кисилев (Helmholzzentrum GSI, Дармштадт)

Аннотация:

Experimental advances in nuclear spectroscopy beyond the proton dripline with the EXPERT setup (EXotic Particle Emission and Radioactivity by Tracking) will be presented.

(I) Phenomena observed in extremely neutron-deficient quasi-stationary isotopes of argon and chlorine elements will be reported by I.Mukha. The experiment, where spectroscopy of five previously-unobserved proton-unbound isotopes, ^28,29,30Cl and ^29,30Ar could be achieved, was performed at the FRS fragment separator by using the state-of-the-art tracking technique applied to all reaction products. The newly-observed systematic trends allow for predictions of even lighter systems, located three mass units further away from the dripline, where ²⁶Ar and ²⁵Cl are expected to form the lightest possible isotopes of these chemical elements. With dominating sd-shell configurations, the ground states of these nuclei are close to the transition to the continuum, their lifetimes become shorter than single-orbit times of the nucleons, and thus the well-ordered nuclear structure starts to dissolve: the end of the nuclear map and the transition to chaotic nucleon matter is expected.

(II) The EXPERT members (dominated by the ACCULINNA and FRS teams) work on gripping such a transition in experiments at the Super-FRS separator of the FAIR project. The dedicated detectors of charged particles, neutrons and gamma rays are being developed and tested at FRS and ACCULINNA. Current status of the EXPERT instrumentation will be reviewed by O.Kiselev.