Fri·Oct 7, 2016Friday·October 7, 2016

1. 01*

   Unexpected distribution of $\nu 1f_{7/2}$ strength in the calcium isotopes at $N$=30

   H. L. Crawford🇺🇸 · A. O. Macchiavelli🇺🇸 · P. Fallon🇺🇸 · M. Albers🇺🇸 · V. M. Bader🇺🇸 · D. Bazin🇺🇸 · C. M. Campbell🇺🇸 · R. M. Clark🇺🇸 · M. Cromaz🇺🇸 · J. Dilling🇨🇦 · A. Gade🇺🇸 · A. T. Gallant🇨🇦 and 21 other authors

   The calcium isotopes have emerged as an important testing ground for new microscopically derived shell-model interactions, and a great deal of focus has been directed toward this region. We investigate the relative spectroscopic strengths associated with $1f_{7/2}$ neutron hole states in ${}^{47,49}$Ca following one-neutron knockout reactions from ${}^{48,50}$Ca. The observed reduction of strength populating the lowest 7/2${}_1^{-}$ state in ${}^{49}$Ca, as compared to ${}^{47}$Ca, is consistent with the description given by shell-model calculations based on two- and three-nucleon forces in the neutron $pf$ model space, implying a fragmentation of the $l$=3 strength to higher-lying states. The experimental result is inconsistent with both the GXPF1 interaction routinely used in this region of the nuclear chart and with microscopic calculations in an extended model space including the $\nu 1g_{9/2}$ orbital.

   nucl-exnucl-thPRC(2017)·18 citations
2. 02*

   Isospin decomposition of the ${\gamma }^{(\ast )}N\to N^{\ast }$ transitions as input for constructing models of neutrino-induced reactions in the nucleon resonance region

   H. Kamano🇯🇵 · S. X. Nakamura🇯🇵 · T.-S. H. Lee🇺🇸 · T. Sato🇯🇵

   We present our recent efforts to determine the matrix elements associated with the transition between the nucleon and a nucleon resonance induced by the vector current, which are necessary ingredients for models of neutrino-induced reactions in the resonance region. This is accomplished by making the comprehensive analysis of the data for various meson photo- and electro-production reactions off the nucleon within a sophisticated coupled-channels framework, which is known as the ANL-Osaka dynamical coupled-channels model. We also give a brief introduction to our project for constructing a unified neutrino reaction model conducted at the J-PARC Branch of the KEK Theory Center.

   ↳ nucl-thhep-exhep-phnucl-ex1 citation
3. 03*

   Modern Dynamical Coupled-Channels Calculations for Extracting and Understanding the Nucleon Spectrum

   Hiroyuki Kamano🇯🇵

   We give an overview of recent progress in the spectroscopic study of nucleon resonances within the dynamical coupled-channels analysis of meson-production reactions. The important role of multichannel reaction dynamics in understanding various properties of nucleon resonances is emphasized.

   ↳ nucl-thhep-phnucl-exJPS Conf.Proc.(2017)·2 citations
4. 04*

   An Experiment to Demonstrate Separation of Cherenkov and Scintillation Signals

   J. Caravaca🇺🇸 · F.B. Descamps🇺🇸 · B.J. Land🇺🇸 · J. Wallig🇺🇸 · M. Yeh🇺🇸 · G.D. Orebi Gann🇺🇸

   The ability to separately identify the Cherenkov and scintillation light components produced in scintillating mediums holds the potential for a major breakthrough in neutrino detection technology, allowing development of a large, low-threshold, directional detector with a broad physics program. The CHESS (CHErenkov / Scintillation Separation) experiment employs an innovative detector design with an array of small, fast photomultiplier tubes and state-of-the-art electronics to demonstrate the reconstruction of a Cherenkov ring in a scintillating medium based on photon hit time and detected photoelectron density. This paper describes the physical properties and calibration of CHESS along with first results. The ability to reconstruct Cherenkov rings is demonstrated in a water target, and a time precision of 338 +/- 12 ps FWHM is achieved. Monte Carlo based predictions for the ring imaging sensitivity with a liquid scintillator target predict an efficiency for identifying Cherenkov hits of 94 +/- 1% and 81 +/- 1% in pure linear alkyl benzene (LAB) and LAB loaded with 2 g/L of PPO, respectively, with a scintillation contamination of 12 +/- 1% and 26 +/- 1%.

   ↳ physics.ins-dethep-exnucl-exPRC(2017)·65 citations
5. 05*

   Charged-particle multiplicity and transverse-energy distribution using the Weibull-Glauber approach in heavy-ion collisions

   Nirbhay K. Behera🇰🇷 · Sadhana Dash🇮🇳 · Bharati Naik🇮🇳 · Basanta K. Nandi🇮🇳 · Tanmay Pani🇮🇳

   The charged-particle multiplicity distribution and the transverse-energy distribution measured in heavy-ion collisions at top RHIC and LHC energies are described using the two-component model approach based on a convolution of the Monte Carlo Glauber model with the Weibull model for particle production. The model successfully describes the multiplicity and transverse-energy distribution of minimum-bias collision data for a wide range of energies. The Weibull-Glauber model can be used to determine the centrality classes in heavy-ion collisions as an alternative to the conventional negative binomial distribution (NBD)-Glauber approach.

   ↳ nucl-thhep-exhep-phnucl-exPRC(2017)·4 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.