Journal
EUROPEAN PHYSICAL JOURNAL A
Volume 55, Issue 9, Pages -Publisher
SPRINGER
DOI: 10.1140/epja/i2019-12856-5
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Funding
- Department of Science and Technology, Government of India [IR/S2/PF03/2003-II]
- U.S. National Foundation [PHY1419765]
- US Department of Energy [DE-FG0295ER40934]
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Excited states of La-133 have been investigated to search for the wobbling excitation mode in the low-spin regime. Wobbling bands with n omega=0and 1 are identified along with the interconnecting Delta I=1, E2 transitions, which are regarded as one of the characteristic features of wobbling motion. An increase in wobbling frequency with spin implies longitudinal wobbling for La-133, in contrast with the case of transverse wobbling observed in Pr-135. This is the first observation of a longitudinal wobbling band in nuclei. The experimental observations are accounted for by calculations using the quasiparticle-triaxial-rotor (QTR) model, which attribute the appearance of longitudinal wobbling to the early alignment of a pi proton pair.
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