Nuclear Data Sheets for A = 68

Low-spin states and the non-observation of a proposed 2202-keV,0+isomer in68Ni

“…4 in comparison with the theoretical AC curves for different spin hypotheses. The spin and parity of the 2847-keV isomer were previously established as 5 − [1,25]; the AC for the 814-keV transition measured here agrees with this assignment [ Fig. 4(a)].…”

“…In turn, these developments serve as a basis for descriptions of more neutron-rich nuclei, including 78 Ni and beyond. Prior to this work, ten states below 3.5 MeV had been proposed in 68 Ni [1,2,21,[23][24][25]. Four of the lowest five states have been assigned spin and parity I π = 0 + , including the recently proposed 2p2h isomer [2,21,23].…”

Characterization of the low-lying0+and2+states inNi68Flavigny1, Pauwels2, Radulov3 et al. 2015Phys. Rev. C462420View full textAdd to dashboardCite

“…The implantation was stopped 69 ms after every PP impact. This limited implantation time of about 2.5 × T 1/2 ( 68 Mn) was applied in order to suppress the implantation of isobaric T 1/2 = 67.71(8) min 68 Ga [28], produced in the spallation of 238 U and surface ionized [29] in the hot cavity of RILIS. This background was measured by periodically blocking one of the RILIS laser beams (laser-off mode).…”

“…An average beam intensity of 3.1(3) implanted 68 Mn ions per second has been obtained during this measuring time when the laser ionization was optimal. The acquisition time after each PP extended to 2.2 s. This means that the first part of this acquisition time (0 to 350 ms) is dominated by the decay radiation of T 1/2 = 28(3) ms 68 Mn and its 188(4) ms [28] 68 Fe daughter. Therefore for a number of cases, only the latter part (350-2200 ms) was used to study the decay of the T 1/2 = 1.6 s [11] low-spin isomer of 68 Co in clean conditions.…”

Capture reactions into Borromean two-proton systems atrpwaiting points

“…The ground states for both core and Borromean nuclei have zero angular momentum and positive parity as always for even-even nuclei. The first excited states of these nuclei are 0.9 MeV [35], 0.9 MeV [36], and 0.7 MeV [37], respectively. These rather high values demonstrate the stability required for a Borromean three-body structure built on these inert cores.…”