7th Workshop on Nuclear Fission and Spectroscopy of Neutron-Rich Nuclei

Session

session 3 (Chair: A. Andreyev)

session_03

10 Mar 2026, 08:30

Salle Totem, Le Bachat, Chamrousse, France

14. Properties of the $^{236m}$U Fission Isomer

Peter Reiter (Germany)

10/03/2026, 08:30

Peter Reiter, University of Cologne

We report on measurements of delayed $\gamma$ decay and delayed fission of the shape isomer $^{236m}$U, as well as a search for isomeric decay in $^{233}$Th, performed with the Heidelberg--Darmstadt Crystal Ball spectrometer. For $^{236m}$U, the data demonstrate that delayed $\gamma$ decay and delayed fission constitute two competing decay modes of the...

36. Fission studies at FIPPS

Marek Stryjczyk

10/03/2026, 08:55

Neutron-induced fission of actinides is a well-established experimental method to probe the structure of neutron-rich nuclei. While this technique provides a wealth of information about several species in a single experiment, the collected data sets are very complex and require multiple coincidences in order to disentangle radiation originating from different fission fragments. A further...

23. Investigating the gamma back-decay from the shape isomer in 236U

Corentin Hiver (Heavy Ion Laboratory, University of Warsaw)

10/03/2026, 09:20

Shape isomers (SI) in actinide nuclei are poorly understood metastable states lying in the second super-deformed prolate potential well. Their unique characteristics include a super-deformed shape, a low spin - similar to that of the normally-deformed ground state - and a main decay mode that is spontaneous fission. Although many such isomers have been discovered in the actinides since their...

24. Recent β-delayed fission studies at ISOLDE

Boris Andel (Comenius University in Bratislava)

10/03/2026, 09:35

In the process of βDF, an excited state populated in β decay close to the top of the fission barrier in the daughter nucleus undergoes fission (in competition with γ-ray or particle emission). The achievable excitation energy is limited by Qβ value of the parent nucleus, which is typically less than ~10 MeV in the lead region, or even less than ~5 MeV in actinides. Therefore, βDF represents...

58. Improvements of the knowledge of actinides on the HPRL for nuclear energy

Ms Carole Chatel (CEA, DES, IRESNE, DER, SPRC, Physics Studies Laboratory, Cadarache, F-13108 Saint-Paul-lez-Durance, France and Univ. Bordeaux, CNRS, CENBG, UMR 5797, F-33170 Gradignan, France)

10/03/2026, 09:50

Neutronics codes accuracy is now driven by the knowledge of their nuclear data used as input, and the structure of nuclei plays a very important role in nuclear reactors, whether for experimental or theoretical physics. Several cross sections are listed on the High Priority Request List (HPRL) [1] for improvements. In this presentation, we will show how improving the knowledge of the nuclear...