Fri·Apr 15, 2016Friday·April 15, 2016

1. 01*

   Spectroscopy of 46Ar by the (t,p) two-neutron transfer reaction

   K. Nowak · K. Wimmer · S. Hellgartner · D. Mücher · V. Bildstein · J. Diriken · J. Elseviers · L. P. Gaffney · R. Gernhäuser · J. Iwanicki · J. G. Johansen · M. Huyse and 15 other authors

   States in the $N=28$ nucleus ${}^{46}$Ar have been studied by a two-neutron transfer reaction at REX-ISOLDE (CERN). A beam of radioactive ${}^{44}$ at an energy of 2.16~AMeV and a tritium loaded titanium target were used to populate ${}^{46}$ by the t(${}^{44}$,p) two-neutron transfer reaction. Protons emitted from the target were identified in the T-REX silicon detector array. The excitation energies of states in ${}^{46}$ have been reconstructed from the measured angles and energies of recoil protons. Angular distributions for three final states were measured and based on the shape of the differential cross section an excited state at 3695~keV has been identified as $J^{\pi }=0^{+}$. The angular differential cross section for the population of different states are compared to calculations using a reaction model employing both sequential and direct transfer of two neutrons. Results are compared to shell model calculations using state-of-the-art effective interactions.

   nucl-exnucl-thPRC(2016)·22 citations
2. 02*

   From dripline to dripline: Nuclear astrophysics in the laboratory

   Zach Meisel🇺🇸

   For the better part of a century the field of nuclear astrophysics has aimed to answer fundamental questions about nature, such as the origin of the elements and the behavior of high-density, low-temperature matter. Sustained and concerted efforts in nuclear experiment have been key to achieving progress in these areas and will continue to be so. Here I will briefly review recent accomplishments and open questions in experimental nuclear astrophysics.

   nucl-exJ.Phys.Conf.Ser.(2016)·3 citations
3. 03*

   A measurement method of a detector response function for monochromatic electrons based on the Compton scattering

   S.V. Bakhlanov🇷🇺 · N.V. Bazlov · A.V. Derbin🇷🇺 · I.S. Drachnev🇮🇹 · A.S. Kayunov🇷🇺 · V.N. Muratova🇷🇺 · D.A. Semenov🇷🇺 · E.V. Unzhakov🇷🇺

   In this paper we present a method of scintillation detector energy calibration using the gamma-rays. The technique is based on the Compton scattering of gamma-rays in a scintillation detector and subsequent photoelectric absorption of the scattered photon in the Ge-detector. The novelty of this method is that the source of gamma rays, the germanium and scintillation detectors are immediately arranged adjacent to each other. The method presents an effective solution for the detectors consisting of a low atomic number materials, when the ratio between Compton effect and photoelectric absorption is large and the mean path of gamma-rays is comparable to the size of the detector. The technique can be used for the precision measurements of the scintillator light yield dependence on the electron energy.

   ↳ physics.ins-dethep-exnucl-exNucl.Instrum.Meth.A(2016)·1 citation
4. 04*

   Tidal wave in ${}^{102}$Pd: An extended five-dimensional collective Hamiltonian description

   Y. Y. Wang🇨🇳 · Z. Shi🇨🇳 · Q. B. Chen🇨🇳 · S. Q. Zhang🇨🇳 · C. Y. Song🇨🇳

   The five-dimensional collective Hamiltonian based on the covariant density functional theory is applied to investigate the observed tidal wave mode in the yrast band of ${}^{102}$Pd. The energy spectra, the relations between the spin and the rotational frequency, and the ratios of $B(E2)/\mathcal{J}(I)$ in the yrast band are well reproduced by introducing the empirical $ab$ formula for the moments of inertia. This $ab$ formula is related to the fourth order effect of collective momentum in the collective Hamiltonian. It is also shown that the shape evolution in the tidal wave is determined microscopically by the competition between the rotational kinetic energy and the collective potential in the framework of the collective Hamiltonian.

   ↳ nucl-thnucl-exPRC(2016)·12 citations
5. 05*

   Understanding the shortened lifetime of \boldmath$\text{isotope}[3][\Lambda ]H$\unboldmath

   Jean-Marc Richard🇫🇷 · Qian Wang🇩🇪 · Qiang Zhao🇨🇳

   The lifetime of the hypertriton $\text{isotope}[3][\Lambda ]H$ has been recently measured as significantly shorter than that of the free $\Lambda$. We present an explanation based on a change of the intrinsic hyperon decay due to the nuclear environment.

   ↳ nucl-thnucl-ex8 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.