Comparative tests of isospin - symmetry - breaking corrections to superallowed 0 + → 0 + nuclear β decay

نویسندگان

  • I. S. Towner
  • J. C. Hardy
چکیده

We present a test with which to evaluate the calculated isospin-symmetry-breaking corrections to superallowed 0+ → 0+ nuclear β decay. The test is based on the corrected experimental F t values being required to satisfy conservation of the vector current (CVC). When applied to six sets of published calculations, the test demonstrates quantitatively that only one set, the one based on the shell model with Saxon-Woods radial wave functions, provides satisfactory agreement with CVC. This test can easily be applied to any sets of calculated correction terms that are produced in future.

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

منابع مشابه

nuclear β decays : A new survey with precision tests of the conserved vector current hypothesis and the standard model

Superallowed 0 + → 0 + nuclear β decays: A new survey with precision tests of the conserved vector current hypothesis and the standard model 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 mea...

متن کامل

Superallowed Fermi beta decay: the radiative correction

Precision studies of superallowed beta decay are used to determine the Cabibbo-KobayashiMaskawa (CKM) matrix element Vud and to study the matrix’s unitarity. To reach this goal, however, the experimental β-decay rates need to be corrected for radiative and isospin-symmetry-breaking effects. The radiative correction, which in total is around 4%, is conveniently divided into terms that are nucleu...

متن کامل

Improved calculation of the isospin-symmetry-breaking corrections to superallowed Fermi β decay

We report new shell-model calculations of the isospin-symmetry-breaking correction δC to superallowed 0+ → 0+ nuclear β decay. The most important improvement is the inclusion of core orbitals, which are demonstrated to have a significant impact on the mismatch in the radial wave functions of the parent and daughter states. We determine which core orbitals are important to include from an examin...

متن کامل

Extraction of Vud from superallowed Fermi b decay by the Wilkinson techniques

The up–down element Vud of the Cabibbo–Kobayashi–Maskawa (CKM) quark mixing matrix is derived from superallowed Fermi b decays between isospin T 1⁄4 1 states using the semi-empirical techniques pioneered by D.H. Wilkinson. Rather than relying directly on the absolute magnitude of theoretical nuclear structure calculations to correct each decay for isospin symmetry breaking effects, these method...

متن کامل

Direct mass measurements on the superallowed emitter 74Rb and its daughter 74Kr: isospin-symmetry-breaking correction for standard-model tests.

The decay energy of the superallowed beta decay 74Rb(beta+)74Kr was determined by direct Penning trap mass measurements on both the mother and the daughter nuclide using the time-of-flight resonance technique and was found to be Q=10 416.8(4.5) keV. The exotic nuclide 74Rb, with a half-life of only 65 ms, is the shortest-lived nuclide on which a high-precision mass measurement in a Penning trap...

متن کامل

ذخیره در منابع من


  با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید

برای دانلود متن کامل این مقاله و بیش از 32 میلیون مقاله دیگر ابتدا ثبت نام کنید

ثبت نام

اگر عضو سایت هستید لطفا وارد حساب کاربری خود شوید

عنوان ژورنال:

دوره   شماره 

صفحات  -

تاریخ انتشار 2010