1. Isomeric Character of the Lowest Observed $4^+$ State in $^{44}$S
- Author
-
Parker, JJ, Wiedenhöver, I, Cottle, PD, Baker, J, McPherson, D, Riley, MA, Santiago-Gonzalez, D, Volya, A, Bader, VM, Baugher, T, Bazin, D, Gade, A, Ginter, T, Iwasaki, H, Loelius, C, Morse, C, Recchia, F, Smalley, D, Stroberg, SR, Whitmore, K, Weisshaar, D, Lemasson, A, Crawford, HL, Macchiavelli, AO, Wimmer, K, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
General Physics ,Engineering ,Physical Sciences ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Mathematical Sciences - Abstract
Previous experiments observed a 4^{+} state in the N=28 nucleus ^{44}S and suggested that this state may exhibit a hindered E2-decay rate, inconsistent with being a member of the collective ground state band. We populate this state via two-proton knockout from a beam of exotic ^{46}Ar projectiles and measure its lifetime using the recoil distance method with the GRETINA γ-ray spectrometer. The result, 76(14)_{stat}(20)_{syst} ps, implies a hindered transition of B(E2;4^{+}→2_{1}^{+})=0.61(19) single-particle or Weisskopf units strength and supports the interpretation of the 4^{+} state as a K=4 isomer, the first example of a high-K isomer in a nucleus of such low mass.
- Published
- 2017
- Full Text
- View/download PDF