AnomalousQ_EC-Values ofT_z=1Nuclei,⁸⁰Y,⁸⁴Nband⁸⁸Tc

Mass measurements of neutron-deficient nuclides close to A = 80 with a Penning trap

“…6934(242) keV [19] and 6200(600) keV [20]. Although these values were consistent, the calculated mass excesses were more than 2 MeV too low compared to the AME value based on the systematics of neighboring isotopic and isotonic chains.…”

“…A direct mass measurement of 80 Y using the second cyclotron of SARA of the ISN as a time-offlight spectrometer gave a Q EC value of 9120(170) keV [21] which proved that the earlier Q EC values were too low. Due to this discrepancy, the results from [18], [19] and [20] have been left out from fig. 6.…”

Mass measurements in the vicinity of ther p-process and theν p-process paths with the Penning trap facilities JYFLTRAP and SHIPTRAP

“…(6,7,8) were observed in coincidence with γ rays. The β-decay endpoint energies were measured by β-γ coincidence gated on the 741-keV γ ray and the derived Q EC values of 88 Tc were given in two different papers [70,71]. In both cases these values are significantly lower by 1.4 MeV and 2.2 MeV, respectively, than those from the systematic trends.…”

“…In a β-decay study at the Tandem Accelerator Laboratories at Kyushu and Tsukuba using the 58 Ni( 32 S, pn) 88 Tc reaction [70] two β-decaying states with half-lives of 5.8(0.2) s for a low-spin state (2, 3) + and 6.4(0.8) s for a high-spin state (6,7,8) were observed in coincidence with γ rays. The β-decay endpoint energies were measured by β-γ coincidence gated on the 741-keV γ ray and the derived Q EC values of 88 Tc were given in two different papers [70,71]. In both cases these values are significantly lower by 1.4 MeV and 2.2 MeV, respectively, than those from the systematic trends.…”