Wed·Apr 15, 2015Wednesday·April 15, 2015

1. 01*

   Empirical description of beta-delayed fission partial half-lives

   L. Ghys · AN. Andreyev🇧🇪 · S. Antalic · M. Huyse🇧🇪 · P. Van Duppen🇧🇪

   Background: The process of beta-delayed fission (bDF) provides a versatile tool to study low-energy fission in nuclei far away from the beta-stability line, especially for nuclei which do not fission spontaneously. Purpose: The aim of this paper is to investigate systematic trends in bDF partial half-lives. Method: A semi-phenomenological framework was developed to systematically account for the behavior of bDF partial half-lives. Results: The bDF partial half-life appears to exponentially depend on the difference between the Q value for beta decay of the parent nucleus and the fission-barrier energy of the daughter (after beta decay) product. Such dependence was found to arise naturally from some simple theoretical considerations. Conclusions: This systematic trend was confirmed for experimental bDF partial half-lives spanning over 7 orders of magnitudes when using fission barriers calculated from either the Thomas-Fermi or the liquid-drop fission model. The same dependence was also observed, although less pronounced, when comparing to fission barriers from the finite-range liquid-drop model or the Thomas-Fermi plus Strutinsky Integral method.

   nucl-exnucl-thPRC(2015)·18 citations
2. 02*

   CUPID: CUORE (Cryogenic Underground Observatory for Rare Events) Upgrade with Particle IDentification

   The CUPID Interest Group

   CUPID is a proposed future ton-scale bolometric neutrinoless double beta decay ($0\nu \beta \beta$) experiment to probe the Majorana nature of neutrinos and discover Lepton Number Violation in the so-called inverted hierarchy region of the neutrino mass. CUPID will be built on experience, expertise and lessons learned in CUORE, and will exploit the current CUORE infrastructure as much as possible. In order to achieve its ambitious science goals, CUPID aims to increase the source mass and dramatically reduce the backgrounds in the region of interest. This requires isotopic enrichment, upgraded purification and crystallization procedures, new detector technologies, a stricter material selection, and possibly new shielding concepts with respect to the state of the art deployed in CUORE. This document reviews the science goals of CUPID, defines the scope for the near-term R&D activities, and presents a roadmap towards mounting this next-generation experiment. A separate document discusses the extensive R&D program in more detail.

   ↳ physics.ins-dethep-exnucl-ex147 citations
3. 03*

   R&D towards CUPID (CUORE Upgrade with Particle IDentification)

   The CUPID Interest Group

   CUPID is a proposed future tonne-scale bolometric neutrinoless double beta decay ($0\nu \beta \beta$) experiment to probe the Majorana nature of neutrinos and discover Lepton Number Violation in the so-called inverted hierarchy region of the neutrino mass. CUPID will be built on experience, expertise and lessons learned in CUORE, and will exploit the current CUORE infrastructure as much as possible. In order to achieve its ambitious science goals, CUPID aims to increase the source mass and dramatically reduce the backgrounds in the region of interest. This requires isotopic enrichment, upgraded purification and crystallization procedures, new detector technologies, a stricter material selection, and possibly new shielding concepts with respect to the state of the art deployed in CUORE. This document reviews and describes the rich and varied R&D activities, performed inside and outside the CUORE collaboration towards the next generation bolometric $0\nu \beta \beta$ experiment. A separate document discusses the science goals and timescale for CUPID in more detail.

   ↳ physics.ins-dethep-exnucl-ex86 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.