Phys.Rev. C 96, 011301 (2017)

M.Lettmann, V.Werner, N.Pietralla, P.Doornenbal, A.Obertelli, T.R.Rodriguez, K.Sieja, G.Authelet, H.Baba, D.Calvet, F.Chateau, S.Chen, A.Corsi, A.Delbart, J.-M.Gheller, A.Giganon, A.Gillibert, V.Lapoux, T.Motobayashi, M.Niikura, N.Paul, J.-Y.Rousse, H.Sakurai, C.Santamaria, D.Steppenbeck, R.Taniuchi, T.Uesaka, T.Ando, T.Arici, A.Blazhev, F.Browne, A.Bruce, R.J.Caroll, L.X.Chung, M.L.Cortes, M.Dewald, B.Ding, F.Flavigny, S.Franchoo, M.Gorska, A.Gottardo, A.Jungclaus, J.Lee, B.D.Linh, J.Liu, Z.Liu, C.Lizarazo, S.Momiyama, K.Moschner, S.Nagamine, N.Nakatsuka, C.Nita, C.R.Nobs, L.Olivier, Z.Patel, Zs.Podolyak, M.Rudigier, T.Saito, C.Shand, P.-A.Soderstrom, I.Stefan, V.Vaquero, K.Wimmer, Z.Xu

Triaxiality of neutron-rich ^{84, 86, 88}Ge from low-energy nuclear spectra

NUCLEAR REACTIONS ¹H(⁸⁵Ge, np), (⁸⁷As, 2p), (⁸⁹As, 2p), E≈270 MeV/nucleon reduced to ≈70 MeV/nucleon through the target, [⁸⁵Ge, ⁸⁷As and ⁸⁹As secondary beams from ⁹Be(²³⁸U, F), E=345 MeV primary reaction at RIBF-RIKEN facility]; measured yields of fission fragments using time-of-flight method and BigRIPS magnetic spectrometer, particle spectra using ZeroDegree spectrometer and Doppler-corrected Eγ, Iγ, γγ-coin using DALI2 array of NaI detectors. ^84,86,88Ge; deduced levels, J, π. Systematics of energies of first 2+ and 4+ states in even-even Z=32-40, N=50-60 nuclei. ^86,88Ge; calculated potential energy surfaces in (β₂, γ) plane using particle number variation after projection (PN-VAP) approach. Discussed triaxiality in even-even Ge nuclei based upon the observation of a tentative 3+ state in ⁸⁶Ge. Comparison with shell-model, and symmetry-conserving configuration mixing Gogny (SCCM) model.

doi: 10.1103/PhysRevC.96.011301