Towards the high spin–isospin frontier using isotopically-identified fission fragments

Identification of new transitions and mass assignments of levels inPr143–153

“…This possible short lifetime would also explain the rather low intensity of the 138.7 keV transition in the prompt (A, Z) gated spectrum. Such a loss of intensity has already been found in the case of the neutron rich Zr isotopes [10]. The gated spectrum on the 374 keV transition of (A, Z) gated data shows evidence for a 253-374-495-542 cascade as seen in Fig.…”

“…As compared to the results presented in Ref. [10] for the Zr isotopes the present work is the result of further improvements in the analysis especially improving the Z identification and also involves a larger data set. Figure 1 shows a two dimensional spectra of A vs 'singles' E γ for the Pr isotopes using such a data set which also allows one to view directly the evolution of the various transitions as a function of mass number.…”

“…The parameters measured at the focal plane [(x,y), ∆E, E r , TOF] along with the known magnetic field were used to determine, on an event-by-event basis, the mass number (A), charge state (q), atomic number (Z), and velocity vector after the reaction for the detected fragment. Isotopic identifications of elements were made up to Z = 63 with a mass resolution of ∆A/A ∼ 0.4% [10]. The prompt γ rays were measured in coincidence with the isotopically-identified fragments, using the EXOGAM array [11] consisting of 11 Compton-suppressed segmented clover HpGe detectors (15 cm from the target).…”

The performance of AGATA: From the LNL demonstrator to the GANIL setup

“…A test of AGATA modules as Compton polarimeters has been performed in the Legnaro campaign [11], using the Coulomb excitation of the first excited Figure 5: Gamma-ray spectra corresponding to the 98 Zr nucleus produced in the fission of a 238 U beam on a 9 Be target at 6.6 MeV/u and identified in the magnetic spectrometer VAMOS. The comparison of performance in gamma-ray detection between the EXOGAM (lower panel, data taken from [13]) and AGATA (upper panel, data taken from December 2014 commissioning runs) arrays is shown. The FWHM at 1.2 MeV is reported.…”

“…The 98 Zr nucleus was populated in the fission process in inverse kinematics of 238 U beam on a 9 Be target at 6.6 MeV/u. The same reaction has been recently used in GANIL for the study of isotopically-identified neutron-rich fission fragments at the VA-MOS++ magnetic spectrometer [13]. Here a spectrum obtained from those data is used for comparison.…”