Phys.Rev. C 106, 064321 (2022)

Z.Elekes, for the Sunflower Collaboration)

"Southwestern" boundary of the N=40 island of inversion: First study of low-lying bound excited states in ⁵⁹V and ⁶¹V

NUCLEAR REACTIONS ¹H(⁶²V, np), (⁶¹V, 2np), (⁶¹V, p), E=250 MeV/nucleon; measured fragments Bρ-ΔE-TOF, Eγ, Iγ, γ∓coin, (fragment)γ-coin, nγ-coin, pγ-coin; deduced σ, γ-ray production σ; calculated exclusive σ for ⁶¹V levels excitation. ^59,61V; deduced levels J, π; calculated levels, J, π, spectroscopic factors. Shell-model calculations using the Lenzi-Nowacki-Poves-Sieja (LNPS) interaction. Due to role of hexadecapole deformation no unambiguous conclusion was made to understand if ⁶¹V belongs to the island of inversion. MINOS active target filled with liquid hydrogen surrounded by DALI2+ array (226 NaI(Tl) scintillators), coupled to NEBULA and NeuLAND neutron TOF neutron detectors and SAMURAI magnetic spectrometer. Beams produced from ⁹Be(⁷⁰Zn, X), E=345 MeV/nucleon reaction followed by separation of fragments BigRIPS separator at RIBF.

doi: 10.1103/PhysRevC.106.064321