Search SciRate

4 results for au:Levand_A in:nucl-ex

Show all abstracts

Improved Limit on Tensor Currents in the Weak Interaction from $^8$Li $\beta$ Decay
M. T. Burkey, G. Savard, A. T. Gallant, N. D. Scielzo, T. Y. Hirsh, L. Varriano, G. H. Sargsyan, K. D. Launey, M. Brodeur, D. P. Burdette, E. Heckmaier, K. Joerres, J. W. Klimes, K. Kolos, A. Laminack, K. G. Leach, A. F. Levand, B. Longfellow, B. Maaß, S. T. Marley, et al (11)
May 05 2022 nucl-ex hep-ph nucl-th arXiv:2205.01865v1

@misc{2205.01865, author = {M.~T.~Burkey and G.~Savard and A.~T.~Gallant and N.~D.~Scielzo and T.~Y.~Hirsh and L.~Varriano and G.~H.~Sargsyan and K.~D.~Launey and M.~Brodeur and D.~P.~Burdette and E.~Heckmaier and K.~Joerres and J.~W.~Klimes and K.~Kolos and A.~Laminack and K.~G.~Leach and A.~F.~Levand and B.~Longfellow and B.~Maaß and S.~T.~Marley and G.~E.~Morgan and P.~Mueller and R.~Orford and S.~W.~Padgett and A.~Pérez Galván and J.~R.~Pierce and D.~Ray and R.~Segel and K.~Siegl and K.~S.~Sharma and B.~S.~Wang}, title = {{I}mproved {L}imit on {T}ensor {C}urrents in the {W}eak {I}nteraction from $^8${L}i $\beta$ {D}ecay}, year = {2022}, eprint = {2205.01865}, note = {arXiv:2205.01865v1} }
PDF
The electroweak interaction in the Standard Model (SM) is described by a pure vector-axial-vector structure, though any Lorentz-invariant component could contribute. In this work, we present the most precise measurement of tensor currents in the low-energy regime by examining the $\beta$-$\bar{\nu}$ correlation of trapped $^{8}$Li ions with the Beta-decay Paul Trap. We find $a_{\beta\nu} = -0.3325 \pm 0.0013_{stat} \pm 0.0019_{syst}$ at $1\sigma$ for the case of coupling to right-handed neutrinos $(C_T=-C_T')$, which is consistent with the SM prediction.
Beta-delayed-neutron studies of $^{135,136}$Sb and $^{140}$I performed with trapped ions
B. S. Alan, S. A. Caldwell, N. D. Scielzo, A. Czeszumska, J. A. Clark, G. Savard, A. Aprahamian, M. T. Burkey, C. J. Chiara, J. Harker, A. F. Levand, S. T. Marley, G. E. Morgan, J. M. Munson, E. B. Norman, A. Nystrom, R. Orford, S. W. Padgett, A. Perez Galvan, K. S. Sharma, et al (2)
Apr 16 2019 nucl-ex astro-ph.IM arXiv:1904.06623v1

@misc{1904.06623, author = {B.~S.~Alan and S.~A.~Caldwell and N.~D.~Scielzo and A.~Czeszumska and J.~A.~Clark and G.~Savard and A.~Aprahamian and M.~T.~Burkey and C.~J.~Chiara and J.~Harker and A.~F.~Levand and S.~T.~Marley and G.~E.~Morgan and J.~M.~Munson and E.~B.~Norman and A.~Nystrom and R.~Orford and S.~W.~Padgett and A.~Perez Galvan and K.~S.~Sharma and K.~Siegl and S.~Y.~Strauss}, title = {{B}eta-delayed-neutron studies of $^{135,136}${S}b and $^{140}${I} performed with trapped ions}, year = {2019}, eprint = {1904.06623}, note = {arXiv:1904.06623v1} }
PDF
Beta-delayed-neutron ($\beta$n) spectroscopy was performed using the Beta-decay Paul Trap and an array of radiation detectors. The $\beta$n branching ratios and energy spectra for $^{135,136}$Sb and $^{140}$I were obtained by measuring the time of flight of recoil ions emerging from the trapped ion cloud. These nuclei are located at the edge of an isotopic region identified as having $\beta$n branching ratios that impact the r-process abundance pattern around the A~130 peak. For $^{135,136}$Sb and $^{140}$I, $\beta$n branching ratios of 14.6(11)%, 17.6(28)%, and 7.6(28)% were determined, respectively. The $\beta$n energy spectra obtained for $^{135}$Sb and $^{140}$I are compared with results from direct neutron measurements, and the $\beta$n energy spectrum for $^{136}$Sb has been measured for the first time.
Mass measurements near the $r$-process path using the Canadian Penning Trap mass spectrometer
J. Van Schelt, D. Lascar, G. Savard, J. A. Clark, S. Caldwell, A. Chaudhuri, J. Fallis, J. P. Greene, A. F. Levand, G. Li, K. S. Sharma, M. G. Sternberg, T. Sun, B. J. Zabransky
Mar 21 2012 nucl-ex arXiv:1203.4470v2

@misc{1203.4470, author = {J.~Van Schelt and D.~Lascar and G.~Savard and J.~A.~Clark and S.~Caldwell and A.~Chaudhuri and J.~Fallis and J.~P.~Greene and A.~F.~Levand and G.~Li and K.~S.~Sharma and M.~G.~Sternberg and T.~Sun and B.~J.~Zabransky}, title = {{M}ass measurements near the $r$-process path using the {C}anadian {P}enning {T}rap mass spectrometer}, year = {2012}, eprint = {1203.4470}, howpublished = {Phys. Rev. C 85, 045805 (2012)}, doi = {10.1103/PhysRevC.85.045805}, note = {arXiv:1203.4470v2} }
PDF
The masses of 40 neutron-rich nuclides from Z = 51 to 64 were measured at an average precision of $\delta m/m= 10^{-7}$ using the Canadian Penning Trap mass spectrometer at Argonne National Laboratory. The measurements, of fission fragments from a $^{252}$Cf spontaneous fission source in a helium gas catcher, approach the predicted path of the astrophysical $r$ process. Where overlap exists, this data set is largely consistent with previous measurements from Penning traps, storage rings, and reaction energetics, but large systematic deviations are apparent in $\beta$-endpoint measurements. Differences in mass excess from the 2003 Atomic Mass Evaluation of up to 400 keV are seen, as well as systematic disagreement with various mass models.
Double-beta decay Q values of 130Te, 128Te, and 120Te
N. D. Scielzo, S. Caldwell, G. Savard, J. A. Clark, C. M. Deibel, J. Fallis, S. Gulick, D. Lascar, A. F. Levand, G. Li, J. Mintz, E. B. Norman, K. S. Sharma, M. Sternberg, T. Sun, J. Van Schelt
Feb 16 2009 nucl-ex arXiv:0902.2376v1

@misc{0902.2376, author = {N.~D.~Scielzo and S.~Caldwell and G.~Savard and J.~A.~Clark and C.~M.~Deibel and J.~Fallis and S.~Gulick and D.~Lascar and A.~F.~Levand and G.~Li and J.~Mintz and E.~B.~Norman and K.~S.~Sharma and M.~Sternberg and T.~Sun and J.~Van Schelt}, title = {{D}ouble-beta decay {Q} values of 130{T}e, 128{T}e, and 120{T}e}, year = {2009}, eprint = {0902.2376}, howpublished = {Phys.Rev.C80:025501,2009}, doi = {10.1103/PhysRevC.80.025501}, note = {arXiv:0902.2376v1} }
PDF
The double-beta decay Q values of 130Te, 128Te, and 120Te have been determined from parent-daughter mass differences measured with the Canadian Penning Trap mass spectrometer. The 132Xe-129Xe mass difference, which is precisely known, was also determined to confirm the accuracy of these results. The 130Te Q value was found to be 2527.01(32) keV which is 3.3 keV lower than the 2003 Atomic Mass Evaluation recommended value, but in agreement with the most precise previous measurement. The uncertainty has been reduced by a factor of 6 and is now significantly smaller than the resolution achieved or foreseen in experimental searches for neutrinoless double-beta decay. The 128Te and 120Te Q values were found to be 865.87(131) keV and 1714.81(125) keV, respectively. For 120Te, this reduction in uncertainty of nearly a factor of 8 opens up the possibility of using this isotope for sensitive searches for neutrinoless double-electron capture and electron capture with positron emission.