PreciseQ ? -values with an intrinsic Germanium detector for light, neutron-rich fission products

Measurements of?-endpoint-energies using a magnetic electron separator

“…For 93Rb there is a discrepancy of about two standard deviations between our value and those reported in [4] and [16]. In the cases of 95'96'97Rb large deviations with the original results from [4] exist.…”

“…The error bars in Table 1 consist of the sum of a systematic error (mainly the calibration uncertainty) and [4]. For 93Rb there is a discrepancy of about two standard deviations between our value and those reported in [4] and [16].…”

“…There the Ge (HP)-//-detector had been calibrated with the BILL electron spectrometer using conversion electrons from the reaction 113 C d (n, e) 114 C d showing linear response up to 9.017 MeV for electrons as well as up to 9.29 MeV for ?,-rays with errors below 1 keV. Assuming this almost linear response for electrons of different energies we here have calibrated the/?-detector using//-single spectra with the well known endpoint energies of 2281.5+_2.5 keV for 90y [11], 4498_+7 keV for 89Rb [-11] and 5318 _+4 keV for 88Rb [4]. These calibration measurements were performed under the same conditions as existed during the main experiments.…”

“…Our experiment (see * This work is part of the doctoral thesis of M. Przewloka also Fig. 1) was placed in the UR-8 experimental hall using the mass separated ISOLDE II ion beam and consisted of a newly constructed achromatic magnetic electron separator [2], a new tape transport system and a Ge(HP) electron detector [3][4][5][6][7].…”

Dissecting Reactor Antineutrino Flux Calculations

“…This a 1 value corresponds to a slope in the ratio of corrected electron spectrum to uncorrected one of +6% MeV −1 . While there have been high-quality measurements of shape factors for light nuclides, most notably for 12 B obtaining an a 1 value of +0.48% MeV −1 [38], only Q-values and strength functions derived from the electron spectra from nuclides relevant to the reactor anomaly, that is, end point energies larger than 3 MeV, have been reported [39,40]. Therefore, there is no experimental evidence that will allow us to rule out an a 1 value of 0.03.…”