Conveners
Beta-decay and fundamental interactions
- Stephane Grevy (CENBG)
Beta-decay and fundamental interactions
- Stephane Grevy (CENBG)
Beta-decay and fundamental interactions
- Adriana Nannini (Universita e INFN, Firenze (IT))
Beta-decay and fundamental interactions
- Adriana Nannini (Universita e INFN, Firenze (IT))
The standard model (SM) of weak interaction describes all weak decays with an amazing precision. It contains two interaction types (or currents): vector currents and axial-vector currents. However, by requiring only Lorentz invariance, three more currents, scalar, tensor, and pseudo-scalar, are also allowed. For these “exotic” currents, only limits are defined today. Search for these currents...
Nuclear beta decay has represented for more than half a century a blooming testing ground for the Standard Model (SM), contributing particularly to the development of the theory of the electroweak interaction. The broad variety of nuclear states and beta transitions provide a highly remarkable tool to be competitive with high-energy physics experiments in searching for the possible presence of...
The Standard Model of Particle Physics (SM) has been a great success describing three of the four fundamental interactions. At the same time, it does not resolve mysteries such as the matter-antimatter asymmetry observed in the Universe, the occurrence of dark matter and dark energy, nor the origin of CP symmetry breaking. Furthermore, the theory includes a large number of free parameters....
A unique feature of thorium-229 is its isomer with an exceptionally low excitation energy, proposed as a candidate for future optical clocks [1]. The small decay width is expected to outperform the accuracy of current state-of-the-art atomic clocks by an order of magnitude [2]. The current best values of the excitation energy are 8.28(17)eV and 8.10(17)eV [3,4]. These were determined using two...
The recent beta delayed neutron emission experiments near 132Sn with VANDLE, and BRIKEN arrays enabled detailed studies of nuclei with very large Qb and small Sn. This allows exploring the underlying physics more thoroughly. The modeling of beta-delayed neutron emission requires the knowledge of beta-decay strength distribution and neutron emission model. The latter customarily uses the...
The β decay of the neutron-rich 134In and 135In was investigated experimentally with the aim of providing new insights into the nuclear structure of the tin isotopes above N=82. Better understanding of exotic nuclides from the 132Sn region is required for accurate modeling of the rapid neutron capture nucleosynthesis process (r process), due to the A≈130 peak in the r-process abundance pattern...
On behalf of IS608/IS650 IDS-Bucharest-York-Leuven Collaboration
The level structure of the semi-magic $^{213}$Fr nucleus has been studied by means of EC/$\beta^{+}$ decay of the $^{213}$Ra 1/2$^{-}$ ground state up to an excitation energy of 3.6 MeV. It is the first observation of the low spin states, with J$\leq$7/2, above the previously known (7/2$^{-}$)$\rightarrow$9/2$^{-}_{gs}$...
Beta-delayed fission ($\beta$DF) provides a means to obtain a wealth of information on fission of exotic isotopes [1,2]. On top of that, it plays an important role in the nucleosynthesis as it contributes to the termination and fission recycling in the r process and thus impacts final abundances of elements in the Universe [3].
In $\beta$DF process, an excited state populated in the...
C. Sotty on behalf of IS650/IS665 IDS, IFIN-HH, Univ. York, IKS Leuven collaborations
The $^{232}Ra$ $\beta^{-}$decay chain was investigated through $\beta$ and $\gamma$-ray spectroscopy at CERN-ISOLDE. A radioactive beam of $^{232}Fr$ and $^{232}Ra$ was implanted on the ISOLDE Decay Station tape, where the $\gamma$-rays originating from the $\beta^{-}$decay chains...
