Details

Autor(en) / Beteiligte

• Forney, A M
• Walters, W B
• Chiara, C J
• Janssens, R V F
• Ayangeakaa, A D
• Sethi, J
• Harker, J
• Alcorta, M
• Carpenter, M P
• Gürdal, G
• Hoffman, C R
• Kay, B P
• Kondev, F G
• Lauritsen, T
• Lister, C J
• McCutchan, E A
• Rogers, A M
• Seweryniak, D
• Stefanescu, I
• Zhu, S

Titel

Novel ΔJ=1 Sequence in Ge78: Possible Evidence for Triaxiality

Ist Teil von

• Physical review letters, 2018-05, Vol.120 (21)

Ort / Verlag

College Park: American Physical Society

Erscheinungsjahr

2018

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• A sequence of low-energy levels in Ge327846 has been identified with spins and parity of 2+, 3+, 4+, 5+, and 6+. Decays within this band proceed strictly through ΔJ=1 transitions, unlike similar sequences in neighboring Ge and Se nuclei. Above the 2+ level, members of this sequence do not decay into the ground-state band. Moreover, the energy staggering of this sequence has the phase that would be expected for a γ-rigid structure. The energies and branching ratios of many of the levels are described well by shell-model calculations. However, the calculated reduced transition probabilities for the ΔJ=2 in-band transitions imply that they should have been observed, in contradiction with the experiment. Within the calculations of Davydov, Filippov, and Rostovsky for rigid-triaxial rotors with γ=30°, there are sequences of higher-spin levels connected by strong ΔJ=1 transitions which decay in the same manner as those observed experimentally, yet are calculated at too high an excitation energy.