Recommended standards for γ-ray energy calibration (1999)

Helmer, R.G.; Leun, C. van der

doi:10.1016/s0168-9002(00)00252-7

Cited by 154 publications

(50 citation statements)

References 45 publications

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“…(19)-from which to determine two parameters, |V ud | and |V us |. We perform a nonlinear least squares fit to obtain the result |V ud | = 0.97424 (22), |V us | = 0.22534 (93). (20) Note that the value of |V ud | obtained from this fitting procedure has only changed by one unit in the last figure compared to Eq.…”

Section: B Unitarity Of the Ckm Matrixmentioning

confidence: 99%

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

2009

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A new critical survey is presented of all half-life, decay-energy, and branching-ratio measurements related to 20 superallowed 0 + → 0 + β decays. Compared with our last review, there are numerous improvements: First, we have added 27 recently published measurements and eliminated 9 references, either because they have been superseded by much more precise modern results or because there are now reasons to consider them fatally flawed; of particular importance, the new data include a number of high-precision Penning-trap measurements of decay energies. Second, we have used the recently improved isospin symmetry-breaking corrections, which were motivated by these new Penning-trap results. Third, our calculation of the statistical rate function f now accounts for possible excitation in the daughter atom, a small effect but one that merits inclusion at the present level of experimental precision. Finally, we have re-examined the systematic uncertainty associated with the isospin symmetry-breaking corrections by evaluating the radial-overlap correction using Hartree-Fock radial wave functions and comparing the results with our earlier calculations, which used Saxon-Woods wave functions; the provision for systematic uncertainty has been changed as a consequence. The new "corrected" Ft values are impressively constant and their average, when combined with the muon lifetime, yields the up-down quark-mixing element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix, V ud = 0.97425 ± 0.00022. The unitarity test on the top row of the matrix becomes |V ud | 2 + |V us | 2 + |V ub | 2 = 0.99995 ± 0.00061. Both V ud and the unitarity sum have significantly reduced uncertainties compared with our previous survey, although the new value of V ud is statistically consistent with the old one. From these data we also set limits on the possible existence of scalar interactions, right-hand currents, and extra Z bosons. Finally, we discuss the priorities for future theoretical and experimental work with the goal of making the CKM unitarity test even more definitive.

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Section: B Unitarity Of the Ckm Matrixmentioning

confidence: 99%

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

2009

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“…The electron-capture decay of 51 Cr is followed by the emission of several X-rays [23] and a 320.0824(4) keV γ ray [24] with a branching ratio of 9.91(1)% [23]. The number of neutrons N n produced in the reaction can then be simply determined from the activity of the target after irradiation.…”

Section: Measurement Of Nero Efficiency With Non-resonant Reactionsmentioning

confidence: 99%

The neutron long counter NERO for studies of neutron emission in the r-process

Pereira

Hosmer

Lorusso

et al. 2010

Nuclear Instruments and Methods in Physics Research Section A:

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The neutron long counter NERO was built at the National Superconducting Cyclotron Laboratory (NSCL), Michigan State University, for measuring β-delayed neutron-emission probabilities. The detector was designed to work * Corresponding author. Tel.: +1 517 9087428; fax: +1 517 3535967Email address: pereira@nscl.msu.edu (J. Pereira) 1 Present address: Navy Nuclear Power School, Goose Creek, South Carolina, USA 2 Present address: Los Alamos National Laboratory, MS E540, Los Alamos, New Mexico, USA Preprint submitted to ElsevierMay 28, 2018 in conjunction with a β-decay implantation station, so that β decays and β-delayed neutrons emitted from implanted nuclei can be measured simultaneously. The high efficiency of about 40%, for the range of energies of interest, along with the small background, are crucial for measuring β-delayed neutron emission branchings for neutron-rich r-process nuclei produced as low intensity fragmentation beams in in-flight separator facilities.

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“…Under certain circumstances, the energies of the prominent gamma rays have been adopted directly from the most accurate measurements, taking into account a correction of 5.8 ppm in the gamma-ray energy scale from ref. [11]. The energies of the gamma rays accompanying the β − decay of 236 Np and 236m Np have been adopted from measurements [12], while the energies of the gamma rays accompanying 236 Np and 236m Np electron-capture decay have been adopted from the evaluated DDEP data for 240 Pu α decay [13].…”

Section: Energies and Probabilities Of Gamma-ray Emissionsmentioning

confidence: 99%

Decay Data Evaluation Project (DDEP): evaluation of the ²³⁷U, ²³⁶Np, ^236mNp and ²⁴¹Pu decay characteristics

Chechev

Kuzmenko

2007

Nd2007

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Recommended standards for γ-ray energy calibration (1999)

Cited by 154 publications

References 45 publications

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

The neutron long counter NERO for studies of neutron emission in the r-process

Decay Data Evaluation Project (DDEP): evaluation of the ²³⁷U, ²³⁶Np, ^236mNp and ²⁴¹Pu decay characteristics

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Recommended standards for γ-ray energy calibration (1999)

Cited by 154 publications

References 45 publications

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

Superallowed0+→0+nuclearβdecays: A new survey with precision tests of the conserved vector current hypothesis and

The neutron long counter NERO for studies of neutron emission in the r-process

Decay Data Evaluation Project (DDEP): evaluation of the 237U, 236Np, 236mNp and 241Pu decay characteristics

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Decay Data Evaluation Project (DDEP): evaluation of the ²³⁷U, ²³⁶Np, ^236mNp and ²⁴¹Pu decay characteristics