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May 13 – 17, 2019
Venice, Centro Culturale Don Orione Artigianelli
Europe/Rome timezone
NSD2019 Proceedings are now available online at www.epj-conferences.org

Low-lying transition strengths in the neutron-deficient Te-isotopes

Not scheduled
15m
SALA PALLADIO (Centro Culturale Don Orione Artigianelli)

SALA PALLADIO

Centro Culturale Don Orione Artigianelli

Speaker

Mr Claus Müller-Gatermann (University of Cologne, Institute for Nuclear Physics)

Description

An enhancement of the B(E2, 2$^+_1\rightarrow$ 0$^+_1$) and unexpectedly low B(E2, 4$^+_1\rightarrow$ 2$^+_1$) values was found in $_{50}$Sn isotopes below mid-shell. However, the puzzling B(E2, 2$^+_1\rightarrow$ 0$^+_1$) systematics around N = 60 was understood very recently in state-of-the-art Monte-Carlo shell model calculations [1] by activating protons in the 1g9/2 orbit and a second-order quantum phase transition from the moderately deformed phase to the pairing (seniority) phase that occurs around N = 66. But a sharp drop of the B(E2, 4$^+_1\rightarrow$ 2$^+_1$) values below N = 66 leading to unusual small B$_{4/2}$=B(E2, 4$^+_1\rightarrow$ 2$^+_1$)/B(E2, 2$^+_1\rightarrow$ 0$^+_1$) ratios is not understood so far.
In neighboring $_{52}$Te isotopes a similar situation seems to be present, where especially data on B(E2, 4$^+_1\rightarrow$ 2$^+_1$) values are lacking that would allow a clear conclusion. An exclusive data point for the neutron-deficient Te isotopes with N < 66 also shows a low B$_{4/2}$ ratio in $^{114}$Te and is a conundrum [2]. In this framework $^{112,116}$Te represent interesting cases as it is just at the edge of the shape transition observed in neighboring Sn isotopes and is also supported by experimental data on $^{114}$Te.
Therefore, we determined B(E2) values between the lowest states in $^{112,116}$Te from level lifetimes measured with the recoil distance Dopplershift method (RDDS). We will present these results and relate them both to the systematics along the Te isotopic chain and to the interpretation of the Sn isotopes.

[1] T. Togashi et al., Phys. Rev. Lett. 121, 062501 (2018)
[2] O. Möller et al., Phys. Rev. C 71, 064324 (2005)

Primary author

Mr Claus Müller-Gatermann (University of Cologne, Institute for Nuclear Physics)

Co-authors

Prof. Alfred Dewald (University of Cologne, Institute for Nuclear Physics) Mrs Alina Goldkuhle (University of Cologne, Institute for Nuclear Physics) Dr Christoph Fransen (University of Cologne, Institute for Nuclear Physics) Mrs Dorothea Wölk (University of Cologne, Institute for Nuclear Physics) Prof. Jan Jolie (University of Cologne, Institute for Nuclear Physics) Dr Julia Litzinger (University of Cologne, Institute for Nuclear Physics) Mr Marcel Bast (University of Cologne, Institute for Nuclear Physics) Mr Marcel Beckers (University of Cologne, Institute for Nuclear Physics) Dr Thomas Braunroth (University of Cologne, Institute for Nuclear Physics)

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