Thu·Jun 1, 2017Thursday·June 1, 2017

1. 01*

   Precise Test of Internal-Conversion Theory: alpha_K Measurements for Transitions in Nine Nuclei Spanning Z values from 45 to 78

   J.C. Hardy🇺🇸 · N. Nica🇺🇸 · V.E. Iacob🇺🇸 · M.B. Trzhaskovskaya

   We have been testing the theory used to calculate internal-conversion coefficients (ICCs) by making a series of measurements of alpha_K values with precision better than +/-2%. So far we have measured E3 transitions in three nuclei, 103Rh, 111Cd and 134Cs; and M4 transitions in six nuclei, 119Sn, 125Te, 127Te, 137Ba, 193Ir and 197Pt. Together, these span a wide range of A and Z values. In all cases, the results strongly favor Dirac-Fock calculations in which the final-state electron wave function has been computed in an atomic field that includes the vacancy created by the internal-conversion process.

   nucl-exnucl-thAppl.Radiat.Isot.(2018)·2 citations
2. 02*

   CUORE Sensitivity to $0\nu \beta \beta$ Decay

   CUORE Collaboration: C. Alduino🇺🇸 · K. Alfonso🇺🇸 · D. R. Artusa🇺🇸 · F. T. Avignone III🇺🇸 · O. Azzolini🇮🇹 · T. I. Banks🇺🇸 · G. Bari🇮🇹 · J.W. Beeman🇺🇸 · F. Bellini🇮🇹 · G. Benato🇺🇸 · A. Bersani🇮🇹 · M. Biassoni🇮🇹 and 118 other authors

   We report a study of the CUORE sensitivity to neutrinoless double beta ($0\nu \beta \beta$) decay. We used a Bayesian analysis based on a toy Monte Carlo (MC) approach to extract the exclusion sensitivity to the $0\nu \beta \beta$ decay half-life ($T_{1/2}^{0\nu }$) at $90\%$ credibility interval (CI) -- i.e. the interval containing the true value of $T_{1/2}^{0\nu }$ with $90\%$ probability -- and the $3\sigma$ discovery sensitivity. We consider various background levels and energy resolutions, and describe the influence of the data division in subsets with different background levels. If the background level and the energy resolution meet the expectation, CUORE will reach a $90\%$ CI exclusion sensitivity of $2\cdot 10^{25}$ yr with $3$ months, and $9\cdot 10^{25}$ yr with $5$ years of live time. Under the same conditions, the discovery sensitivity after $3$ months and $5$ years will be $7\cdot 10^{24}$ yr and $4\cdot 10^{25}$ yr, respectively.

   ↳ physics.ins-detnucl-exEPJC(2017)·57 citations
3. 03*

   Lorentz Structure of Vector Part of Matrix Elements of Transitions n <-> p, Caused by Strong Low-Energy Interactions and Hypothesis of Conservation of Charged Vector Current

   A. N. Ivanov🇦🇹

   We analyse the Lorentz structure of the matrix elements of the transitions "neutron <-->proton", induced by the charged hadronic vector current. We show that the term maintaining conservation of the charged hadronic vector current even for different masses of the neutron and proton (see T. Leitner et al., Phys. Rev. C 73, 065502 (2006) and A. M. Ankowski, arXiv:1601.06169 [hep-ph]) has a dynamical origin, related to the G-even first class current contribution. We show that because of invariance of strong low-energy interactions under the G-parity transformations, the G-odd contribution with the Lorentz structure $q_{\mu }$, where $q_{\mu }$ is a momentum transferred, does not appear in the matrix elements of the ``neutron <-> proton' transitions.

   ↳ hep-phhep-exnucl-exnucl-thJ.Phys.G(2018)·9 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.