Ponente
Descripción
With the arrival of the HiCARI campaign [1] to the RIBF facility at RIKEN (Japan), a series of in-
beam g-ray spectroscopy experiments was performed in order to expand the previous spectroscopic
information on exotic, neutron-rich nuclei of intermediate mass. Previously, incompatible results
regarding the reduced transition probability for the decay of the first excited 2+ state, B(E2), in 136Te
were reported from Coulex experiments and direct lifetime measurements using the fast-timing
technique [2-5]. Due to the better energy resolution of the Ge detectors forming the HiCARI array,
as compared to the previously used DALI2 NaI(Tl) array [6], in experiment NP1912-RIBF193 it is
possible to extract, from the same data set, B(E2) values from the cross sections measured for the
inelastic excitation on Au and Be targets on the one hand and the analysis of Doppler-shifted
lineshapes on the other. The new results will shed light on the conflict between transition strengths
derived from Coulex and lifetime measurements reported for several nuclei in the literature.
In this conference I aim to present lifetime results for the excited states of 136Te, populated via
Coulex and one neutron knockout reactions. Moreover, a comprehensive description of the
employed analysis methods, as well as a full characterization of the HiCARI array and its sources of
systematic uncertainties will be presented, as other cases corresponding to different lifetime regimes
(e.g. 131Sn, 131In) were studied in detail too.
References
[1] https://www.nishina.riken.jp/collaboration/SUNFLOWER/devices/hrarray/index.php, accessed 12-01-2024
[2] J. M. Allmond et al., Phys. Rev. Lett. 118, 092503 (2017)
[3] M. Danchev et al., Phys. Rev. C 84, 061306(R) (2011)
[4] L.M. Fraile et al., Nucl. Phys. A 805, 218 (2008).
[5] V. Vaquero et al., Phys. Rev. C 99, 034306 (2019)
[6] S. Takeuchi et al., Nucl. Instr. Meth. A 763, 596 (2014)
