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Background: The $^{136}$Ba isotope is the daughter nucleus in $^{136}$Xe$\beta\beta$ decay. It also lies in a shape transitional region of the nuclearchart, making it a suitable candidate to test a variety of nuclear models.Purpose: To obtain spectroscopic information on states in $^{136}$Ba, whichwill allow a better understanding of its low-lying structure. These data mayprove useful to constrain future $^{136}$Xe $\to$ $^{136}$Ba neutrinoless$\beta\beta$ decay matrix element calculations. Methods: A$^{138}\mathrm{Ba}(p,t)$ reaction was used to populate states in $^{136}$Ba upto approximately 4.6 MeV in excitation energy. The tritons were detected usinga high-resolution Q3D magnetic spectrograph. A distorted wave Bornapproximation (DWBA) analysis was performed for the measured triton angulardistributions. Results: One hundred and two excited states in $^{136}$Ba wereobserved, out of which fifty two are reported for the first time. Definitespin-parity assignments are made for twenty six newly observed states, whilepreviously ambiguous assignments for twelve other states are resolved.

Spectroscopy of states in $^{136}\rm{Ba}$ using the $^{138}\rm{Ba}(p,t)$ reaction