Mon·Apr 11, 2016Monday·April 11, 2016

1. 01*

   Clustering in stable and exotic nuclei

   C. Beck🇫🇷

   Since the pioneering discovery of molecular resonances in the 12C+12C reaction more than half a century ago a great deal of research work has been undertaken in alpha clustering. Our knowledge on physics of nuclear molecules has increased considerably and nuclear clustering remains one of the most fruitful domains of nuclear physics, facing some of the greatest challenges and opportunities in the years ahead. The occurrence of "exotic" shapes and Bose-Einstein alpha condensates in light N=Z alpha-conjugate nuclei is investigated. Various approaches of the superdeformed and hyperdeformed bands associated with quasimolecular resonant structures are presented. Evolution of clustering from stability to the drip-lines is examined: clustering aspects are, in particular, discussed for light exotic nuclei with large neutron excess such as neutron-rich Oxygen isotopes with their complete spectroscopy.

   nucl-exnucl-thNuclear Particle Correlations and Cluster…·2 citations
2. 02*

   Search for narrow resonances in $\pi p$ elastic scattering from the EPECUR experiment

   A. Gridnev🇷🇺 · I.G. Alekseev🇷🇺 · V.A. Andreev🇷🇺 · I.G. Bordyuzhin🇷🇺 · W.J. Briscoe🇺🇸 · Ye.A. Filimonov🇷🇺 · V.V. Golubev🇷🇺 · D.V. Kalinkin🇷🇺 · L.I. Koroleva🇷🇺 · N.G. Kozlenko🇷🇺 · V.S. Kozlov🇷🇺 · A.G. Krivshich🇷🇺 and 13 other authors

   The analysis of high-precision ${\pi }^{\pm }p\to {\pi }^{\pm }p$ cross section data from the EPECUR Collaboration based on the multichannel $K$-matrix approach is presented.The sharp structures seen in these data are studied in terms of both opening thresholds and new resonance contributions. Some prominent features are found to be due to the opening $K\Sigma$ channel. However, a complete description of the data is improved with the addition of two narrow resonant structures at $W\sim 1.686$ and $W\sim 1.720$ GeV. These structures are interpreted as manifestations of $S_{11}$ and $P_{11}$ resonances. The underlying nature of the observed phenomena is discussed.

   nucl-exPRC(2016)·15 citations
3. 03*

   A dipole amplifier for electric dipole moments, axion-like particles and a dense dark matter hairs detector

   Gary Prezeau🇺🇸

   A tool that can constrain, in minutes, beyond-the-standard-model parameters like electric dipole moments (EDM) down to a lower-bound $d_{\text{e}}^{\mathcal{N}}<10^{-37}\text{e}\cdot \text{cm}$ in bulk materials, or the coupling of axion-like particles (ALP) to photons down to $|G_{a\gamma \gamma }|<10^{-16}$~GeV${}^{-1}$, is described. Best limits are $d_e^n<3\cdot 10^{-26}\text{e}\cdot \text{cm}$ for neutron EDM and $|G_{a\gamma \gamma }|<6.6\cdot 10^{-11}$~GeV${}^{-1}$. The {\it dipole amplifier} is built from a superconducting loop immersed in a toroidal magnetic field, $\vec{B}$. When nuclear magnetic moments in the London penetration depth align with $\vec{B}$, the bulk magnetization is always accompanied by an EDM-induced bulk electric field $\vec{E}\propto \vec{B}$ that generates detectable oscillatory supercurrents with a characteristic frequency ${\omega }_{\text{D}}\propto d_{\text{e}}^{\mathcal{N}}$. Cold dark matter (CDM) ALP are formally similar where ${\omega }_{\text{D}}\propto |G_{a\gamma \gamma }|\sqrt{n_a/(2m_a)}$ with $m_a$ the ALP mass and $n_a$ its number density. A space probe traversing a dark matter hair with a dipole amplifier is sensitive enough to detect ALP density variations if $|G_{a\gamma \gamma }|\sqrt{n_h/(2m_a)}>4.9\cdot 10^{-27}$ where $n_h$ is the ALP number density in the hair.

   ↳ astro-ph.IMastro-ph.COhep-exnucl-ex+10 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.