Fri·Apr 6, 2018Friday·April 6, 2018

1. 01*

   First observation of the competing fission modes in the neutron-deficient sub-lead region

   I. Tsekhanovich🇫🇷 · A.N. Andreyev🇬🇧 · K. Nishio🇯🇵 · D. Denis-Petit🇫🇷 · K. Hirose🇯🇵 · H. Makii🇯🇵 · Z. Matheson🇺🇸 · K. Morimoto🇯🇵 · K. Morita🇯🇵 · W. Nazarewicz🇺🇸 · R. Orlandi🇯🇵 · J. Sadhukhan🇮🇳 and 3 other authors

   Fragment mass distributions from fission of excited compound nucleus ${}^{178}$Pt have been deduced from the measured fragment velocities. The ${}^{178}$Pt nucleus was created at the JAEA tandem facility in a complete fusion reaction ${}^{36}$Ar + ${}^{142}$Nd, at beam energies of 155, 170 and 180 MeV. The data are indicative of a mixture of the mass-asymmetric and mass-symmetric fission modes associated with higher and lower total kinetic energies of the fragments, respectively. The measured fragment yields are dominated by asymmetric mass splits, with the symmetric mode contributing at the level of $\approx 1/3$. This constitutes the first observation of a multimodal fission in the sub-lead region. Most probable experimental fragment-mass split of the asymmetric mode, $A_L/A_H\approx 79/99$, is well reproduced by nuclear density functional theory using the UNEDF1-HFB and D1S potentials. The symmetric mode is associated by theory with very elongated fission fragments, which is consistent with the observed total kinetic energy/fragment mass correlation.

   nucl-exPLB(2019)·52 citations
2. 02*

   Deep excursion beyond the proton dripline. II. Toward the limits of existence of nuclear structure

   L.V. Grigorenko🇷🇺 · I. Mukha · D. Kostyleva🇩🇪 · C. Scheidenberger🇩🇪 · L. Acosta🇮🇹 · E. Casarejos🇪🇸 · V. Chudoba🇷🇺 · A.A. Ciemny🇵🇱 · W. Dominik🇵🇱 · J.A. Dueñas🇪🇸 · V. Dunin · J. M. Espino🇪🇸 and 38 other authors

   Prospects of experimental studies of argon and chlorine isotopes located far beyond the proton dripline are studied by using systematics and cluster models. The deviations from the widespread systematics observed in ${}^{28,29}$Cl and ${}^{29,30}$Ar have been theoretically substantiated, and analogous deviations predicted for the lighter chlorine and argon isotopes. The limits of nuclear structure existence are predicted for Ar and Cl isotopic chains, with ${}^{26}$Ar and ${}^{25}$Cl found to be the lightest sufficiently long-living nuclear systems. By simultaneous measurements of protons and $\gamma$-rays following decays of such systems as well as their $\beta$-delayed emission, an interesting synergy effect may be achieved, which is demonstrated by the example of ${}^{30}$Cl and ${}^{31}$Ar ground state studies. Such synergy effect may be provided by the new EXPERT setup (EXotic Particle Emission and Radioactivity by Tracking), being operated inside the fragment separator and spectrometer facility at GSI, Darmstadt.

   nucl-exPRC(2018)·7 citations
3. 03*

   Electron drift properties in high pressure gaseous xenon

   NEXT Collaboration: A. Simón🇪🇸 · R. Felkai🇪🇸 · G. Martínez-Lema🇪🇸 · F. Monrabal🇺🇸 · D. González-Díaz🇪🇸 · M. Sorel🇪🇸 · J.A. Hernando Morata🇪🇸 · J.J. Gómez-Cadenas🇪🇸 · C. Adams🇺🇸 · V. Álvarez🇪🇸 · L. Arazi🇮🇱 · C.D.R. Azevedo🇵🇹 and 63 other authors

   Gaseous time projection chambers (TPC) are a very attractive detector technology for particle tracking. Characterization of both drift velocity and diffusion is of great importance to correctly assess their tracking capabilities. NEXT-White is a High Pressure Xenon gas TPC with electroluminescent amplification, a 1:2 scale model of the future NEXT-100 detector, which will be dedicated to neutrinoless double beta decay searches. NEXT-White has been operating at Canfranc Underground Laboratory (LSC) since December 2016. The drift parameters have been measured using ${}^{83m}$Kr for a range of reduced drift fields at two different pressure regimes, namely 7.2 bar and 9.1 bar. The results have been compared with Magboltz simulations. Agreement at the 5% level or better has been found for drift velocity, longitudinal diffusion and transverse diffusion.

   ↳ physics.ins-dethep-exnucl-exJINST(2018)·32 citations
4. 04*

   Effects of Tensor Force in the Relativistic Scheme: A Case Study of Neutron Drops

   Shihang Shen🇨🇳 · Haozhao Liang🇯🇵 · Jie Meng🇨🇳 · Peter Ring🇨🇳 · Shuangquan Zhang🇨🇳

   Tensor force is an important component in the nucleon-nucleon interaction, nevertheless, the role of the tensor force in the spin properties in finite nuclei is much less clear. In this report, we mainly focus on our recent progress on this topic about the relativistic Brueckner-Hartree-Fock theory and the corresponding tensor effects on the spin-orbit splittings in neutron drops. This will serve as an important guide for future microscopic derivations of the relativistic and non-relativistic nuclear energy density functionals.

   ↳ nucl-thnucl-exJPS Conf.Proc.(2018)·0 citations
5. 05*

   Particle identification using digital pulse shape discrimination in a nTD silicon detector with a 1 GHz sampling digitizer

   K. Mahata🇮🇳 · A. Shrivastava🇮🇳 · J. A. Gore · S. K. Pandit🇮🇳 · V. V. Parkar🇮🇳 · K. Ramachandran🇮🇳 · A. Kumar🇮🇳 · S. Gupta · P. Patale

   In beam test experiments have been carried out for particle identification using digital pulse shape analysis in a 500~$\mu$m thick Neutron Transmutation Doped (nTD) silicon detector with an indigenously developed FPGA based 12 bit resolution, 1 GHz sampling digitizer. The nTD Si detector was used in a low-field injection setup to detect light heavy-ions produced in reactions of $\sim$ 5 MeV/A ${}^7$Li and ${}^{12}$C beams on different targets. Pulse height, rise time and current maximum have been obtained from the digitized charge output of a high bandwidth charge and current sensitive pre-amplifier. Good isotopic separation have been achieved using only the digitized charge output in case of light heavy-ions. The setup can be used for charged particle spectroscopy in nuclear reactions involving light heavy-ions around the Coulomb barrier energies.

   ↳ physics.ins-detnucl-exNucl.Instrum.Meth.A(2018)·6 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.