Mon·Mar 26, 2018Monday·March 26, 2018

1. 01*

   Into the fission valley of magic nucleus Polonium

   Tilak Kumar Ghosh🇮🇳

   The word "radioactive" was first coined by Marie Curie when she, along with her husband Pierre Curie, discovered the element Polonium. The nucleus 210Po is a testing ground for many theoretical and experimental aspects of nuclear structure as well as nuclear fission dynamics as it is a magic nucleus with neutron number N=126. At Variable Energy Cyclotron Centre, Kolkata the fission of Polonium nuclei is being studied in order to understand the survival of nuclear shell effects that is known to be the key for the stability of super heavy elements (SHE).

   nucl-ex0 citations
2. 02*

   Neutron-induced reactions in nuclear astrophysics

   René Reifarth🇩🇪 · David Brown🇺🇸 · Saed Dababneh🇯🇴 · Yuri A. Litvinov🇩🇪 · Shea M. Mosby

   The quest for the origin of the chemical elements, which we find in our body, in our planet (Earth), in our star (Sun), or in our galaxy (Milky Way) could only be resolved with a thorough understanding of the nuclear physics properties of stable and unstable atomic nuclei. While the elements until iron are either created during the big bang or during fusion reactions in stars, most of the elements heavier than iron are produced via neutron-induced reactions. Therefore, neutron capture cross sections of stable and unstable isotopes are important. So far, time-of-flight or activation methods have been applied very successfully, but these methods reach their limits once the isotopes with half-lives shorter than a few months are of interest. A combination of a radioactive beam facility, an ion storage ring and a high flux reactor or a spallation source would allow a direct measurement of neutron-induced reactions over a wide energy range of isotopes with half-lives down to minutes. The idea is to measure neutron-induced reactions on radioactive ions in inverse kinematics. This means, the radioactive ions will pass through a neutron target. In order to efficiently use the rare nuclides as well as to enhance the luminosity, the exotic nuclides can be stored in an ion storage ring. The neutron target can be the core of a research reactor, where one of the central fuel elements is replaced by the evacuated beam pipe of the storage ring. Alternatively, a large moderator surrounding a spallation source can be intersected by the beam pipe of an ion storage ring. Using particle detectors and Schottky spectroscopy, most of the important neutron-induced reactions, such as (n,$\gamma$), (n,p), (n,$\alpha$), (n,2n), or (n,f), could be investigated.

   nucl-exJordan J.Phys.(2018)·0 citations
3. 03*

   On the emission probability of the 66.7 keV {\gamma}-transition in the decay of 171Tm

   I. Kajan · S. Heinitz🇨🇭 · R. Dressler🇨🇭 · P. Reichel · N. Kivel🇩🇪 · D. Schumann🇨🇭

   The {\gamma}-emission probability of the 66.73 keV line in the decay of 171Tm has been experimentally determined using {\gamma}-spectrometry and inductively coupled mass spectrometry. Using a set of two reference sources, namely 60Co as primary standard and 44Ti/44Sc in secular equilibrium as secondary standards, we were able to deduce the detection efficiency at 67.87 keV of the used {\gamma}-spectrometry setup with high precision. The emission probability of the 66.73 keV {\gamma}-transition in the decay of 171Tm has been determined with a set of three radioisotopically pure 171Tm samples to be 0.159(6) %.

   nucl-exphysics.atom-phPRC(2018)·3 citations
4. 04*

   Probing the gluonic structure of the nucleon through quarkonium production

   S. Joosten🇺🇸

   Heavy quarkonium production will provide for novel opportunities to study the gluonic structure of the nucleon in the near future. Near threshold quarkonium production allows for direct experimental access of the dynamic origin of the nucleon mass as well as the nature of the color Van der Waals force, while quarkonium production at high energies can be used to create a full three-dimensional tomographic image of the gluons inside the nucleon, constraining the gluonic radius of the nucleon.

   ↳ hep-phhep-exnucl-ex5 citations
5. 05*

   New physics searches in nuclear and neutron $\beta$ decay

   Martin Gonzalez-Alonso🇨🇭 · Oscar Naviliat-Cuncic🇺🇸 · Nathal Severijns🇧🇪

   The status of tests of the standard electroweak model and of searches for new physics in allowed nuclear $\beta$ decay and neutron decay is reviewed including both theoretical and experimental developments. The sensitivity and complementarity of recent and ongoing experiments are discussed with emphasis on their potential to look for new physics. Measurements are interpreted using a model-independent effective field theory approach enabling to recast the outcome of the analysis in many specific new physics models. Special attention is given to the connection that this approach establishes with high-energy physics. A new global fit of available $\beta$-decay data is performed incorporating, for the first time in a consistent way, superallowed $0^{+}\to 0^{+}$ transitions, neutron decay and nuclear decays. The constraints on exotic scalar and tensor couplings involving left- or right-handed neutrinos are determined while a constraint on the pseudoscalar coupling from neutron decay data is obtained for the first time as well. The values of the vector and axial-vector couplings, which are associated within the standard model to $V_{ud}$ and $g_A$ respectively, are also updated. The ratio between the axial and vector couplings obtained from the fit under standard model assumptions is $C_A/C_V=-1.27510(66)$. The relevance of the various experimental inputs and error sources is critically discussed and the impact of ongoing measurements is studied. The complementarity of the obtained bounds with other low- and high-energy probes is presented including ongoing searches at the Large Hadron Collider.

   ↳ hep-phnucl-exnucl-thPPNP(2019)·297 citations
6. 06*

   Structure and Width of the d*(2380) Dibaryon

   Avraham Gal🇮🇱

   In this contribution, dedicated to the memory of Walter Greiner, we discuss the structure and width of the recently established d*(2380) dibaryon, confronting the consequences of our Pion Assisted Dibaryons hadronic model with those of quark motivated calculations. In particular, its relatively small width of about 70 MeV favors hadronic structure for the d*(2380) dibaryon rather than a six-quark structure.

   ↳ nucl-thhep-phnucl-ex6 citations
7. 07*

   Effect of in-medium nucleon-nucleon cross section on proton-proton momentum correlation in intermediate energy heavy-ion collision

   Ting-Ting Wang🇨🇳 · Yu-Gang Ma🇨🇳 · Chun-Jian Zhang🇨🇳 · Zheng-Qiao Zhang🇨🇳

   The proton-proton momentum correlation function from different rapidity regions are systematically investigated for the Au + Au collisions at different impact parameters and different energies from 400$A$ MeV to 1500$A$ MeV in the framework of the isospin-dependent quantum molecular dynamics model complemented by the $Lednick\acute{y}$ and $Lyuboshitz$ analytical method. In particular, in-medium nucleon-nucleon cross section dependence of the correlation function is brought into focus, while the impact parameter and energy dependence of the momentum correlation function are also explored. The sizes of the emission source are extracted by fitting the momentum correlation functions using the Gaussian source method. We find that the in-medium nucleon-nucleon cross section obviously influence the proton-proton momentum correlation function which is from the whole rapidity or projectile/target rapidity region at smaller impact parameters, but there is no effect on the mid-rapidity proton-proton momentum correlation function, which indicates that the emission mechanism differs between projectile/target rapidity and mid-rapidity protons.

   ↳ nucl-thnucl-exPRC(2018)·21 citations
8. 08*

   Progress in measurements of 0.1--10 GeV neutrino-nucleus scattering and anticipated results from future experiments

   Kendall Mahn🇺🇸 · Chris Marshall🇺🇸 · Callum Wilkinson🇨🇭

   Neutrino interactions with nuclei have been the subject of intense interest over the last 15 years. Current and future measurements of neutrino oscillation and exotic physics use order 0.1--10 GeV neutrinos on a range of nuclear targets (${}^{12}$C, ${}^{16}$O, ${}^{40}$Ar). As the precision of these experiments has increased, information from their detectors and dedicated experiments indicate deficiencies in the modeling of neutrino interactions on nuclear targets. Here, we present the current state of knowledge about neutrino-nucleus interactions, the challenge of extracting the cross section of these processes, and current experimental puzzles in the field. We also look forward to new and novel measurements and efforts in the future which seek to resolve these questions.

   ↳ hep-exhep-phnucl-exAnn.Rev.Nucl.Part.Sci.(2018)·44 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.