Thu·Feb 12, 2015Thursday·February 12, 2015

1. 01*

   Rate Analysis or a Possible Interpretation of Abundances

   Miklos Kiss

   Heavy elements are formed in nucleosynthesis processes. Abundances of these elements can be classified as elemental abundance, isotopic abundance, and abundance of nuclei. In this work we propose to change nucleon identification from the usual (Z,A) to (Z,N), which allows reading out new information from the measured abundances. We are interested in the neutron density required to reproduce the measured abundance of nuclei assuming equilibrium processes. This is only possible when two stable nuclei are separated by an unstable nucleus. At these places we investigated the neutron density required for equilibrium nucleosynthesis both isotopically and isotonically at temperatures of AGB interpulse and thermal pulse phases. We obtained an estimate for equilibrium nucleosynthesis neutron density in most of the cases. Next we investigated the possibility of partial formation of nuclei. We analyzed the meaning of the branching factor. We found a mathematical definition for the unified interpretation of a branching point closed at isotonic case and open at isotopic case. We introduce a more expressive variant of branching ratio called partial formation rate. With these we are capable of determining the characteristic neutron density values.

   nucl-exPoS(2015)·0 citations
2. 02*

   Low Background Signal Readout Electronics for the MAJORANA DEMONSTRATOR

   I. Guinn🇺🇸 · N. Abgrall🇺🇸 · F. T. Avignone III🇺🇸 · A. S. Barabash🇷🇺 · F. E. Bertrand🇺🇸 · V. Brudanin🇷🇺 · M. Busch🇺🇸 · M. Buuck🇺🇸 · D. Byram🇺🇸 · A.S. Caldwell🇺🇸 · Y-D. Chan🇺🇸 · C. D. Christofferson🇺🇸 and 53 other authors

   The MAJORANA DEMONSTRATOR is a planned 40 kg array of Germanium detectors intended to demonstrate the feasibility of constructing a tonne-scale experiment that will seek neutrinoless double beta decay ($0\nu \beta \beta$) in ${}^{76}\mathrm{Ge}$. Such an experiment would require backgrounds of less than 1 count/tonne-year in the 4 keV region of interest around the 2039 keV Q-value of the $\beta \beta$ decay. Designing low-noise electronics, which must be placed in close proximity to the detectors, presents a challenge to reaching this background target. This paper will discuss the MAJORANA collaboration's solutions to some of these challenges.

   ↳ physics.ins-detnucl-exJ.Phys.Conf.Ser.(2015)·3 citations
3. 03*

   Spectrometer for new gravitational experiment with UCN

   G.V. Kulin (1) · A.I. Frank (1) · S.V. Goryunov (1) · D.V. Kustov (1 and 3) · P. Geltenbort (2)🇫🇷 · M. Jentschel (2)🇫🇷 · A.N. Strepetov (4) · V.A. Bushuev (5) ((1) Joint Institute for Nuclear Research, Dubna, Russia, (2) Institut Lauer-Langevin, Grenoble, France, (3) Institute for Nuclear Research, Kiev, Ukraine, (4) Institute of General and Nuclear Physics, RCC Kurchatov Institute, Moscow, Russia, (5) Moscow State University, Moscow, Russia)

   We describe an experimental installation for a new test of the weak equivalence principle for neutron. The device is a sensitive gravitational spectrometer for ultra-cold neutrons allowing to precisely compare the gain in kinetic energy of free falling neutrons to quanta of energy $\hslash \Omega$ transferred to the neutron via a non stationary device, i.e. a quantum modulator. The results of first test experiments indicate a collection rate allowing measurements of the factor of equivalence $\gamma$ with a statistical uncertainty in the order of $5\times 10^{-3}$ per day. A number of systematic effects were found, which partially can be easily corrected. For the elimination of others more detailed investigations and analysis are needed. Some possibilities to improve the device are also discussed.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2015)·15 citations
4. 04*

   Determination of the structure of the $X(3872)$ in $\bar{p}A$ collisions

   A.B. Larionov🇩🇪 · M. Strikman🇺🇸 · M. Bleicher🇩🇪

   Currently, the structure of the $X(3872)$ meson is unknown. Different competing models of the $c\bar{c}$ exotic state $X(3872)$ exist, including the possibilities that this state is either a mesonic molecule with dominating $D^0{\bar{D}}^{\ast 0}+c.c.$ composition, a $c\bar{c}q\bar{q}$ tetraquark, or a $c\bar{c}$-gluon hybrid state. It is expected that the $X(3872)$ state is rather strongly coupled to the $\bar{p}p$ channel and, therefore, can be produced in $\bar{p}p$ and $\bar{p}A$ collisions at PANDA. We propose to test the hypothetical molecular structure of $X(3872)$ by studying the $D$ or ${\bar{D}}^{\ast }$ stripping reactions on a nuclear residue.

   ↳ nucl-thhep-phnucl-exPLB(2015)·11 citations
5. 05*

   Searching for P- and CP-odd effects in heavy ion collisions

   A.A. Andrianov🇷🇺 · V.A. Andrianov🇷🇺 · D. Espriu🇪🇸 · X. Planells🇪🇸

   In this talk we will summarize the main results from our recent work concerning the possibility that a new metastable phase occurs in some heavy ion collisions (HIC). This phase would be characterized by the breaking of two characteristic symmetries of strong interactions; namely P and CP. We investigate the experimental consequences of parity breaking in such a situation and propose suitable observables to elucidate the presence this phenomenon.

   ↳ hep-phhep-exnucl-exAIP Conf.Proc.(2016)·0 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.