Fri·Feb 27, 2015Friday·February 27, 2015

1. 01*

   Nuclear clocks based on resonant excitation of gamma-transitions

   Ekkehard Peik · Maxim Okhapkin

   We review the ideas and concepts for a clock that is based on a radiative transition in the nucleus rather than in the electron shell. This type of clock offers advantages like an insensitivity against field-induced systematic frequency shifts and the opportunity to obtain high stability from interrogating many nuclei in the solid state. Experimental work concentrates on the low-energy (about 8 eV) isomeric transition in Th-229. We review the status of the experiments that aim at a direct optical observation of this transition and outline the plans for high-resolution laser spectroscopy experiments.

   nucl-exphysics.atom-phComptes Rendus Physique(2015)·75 citations
2. 02*

   Examination of the Nature of the ABC Effect

   M. Bashkanov🇬🇧 · H. Clement🇩🇪 · T. Skorodko🇩🇪

   Recently it has been shown by exclusive and kinematically complete experiments that the appearance of a narrow resonance structure in double-pionic fusion reactions is strictly correlated with the appearance of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the $\pi \pi$-invariant mass spectrum. Whereas the resonance structure got its explanation by the $d^{\ast }(2380)$ dibaryonic resonance, a satisfactory explanation for the ABC effect is still pending. In this paper we discuss possible explanations of the ABC effect and their consequences for the internal structure of the $d^{\ast }$ dibaryon.

   nucl-exnucl-thNPA(2017)·32 citations
3. 03*

   Long-range pseudorapidity dihadron correlations in $d$+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV

   L. Adamczyk🇵🇱 · J. K. Adkins🇺🇸 · G. Agakishiev🇷🇺 · M. M. Aggarwal🇮🇳 · Z. Ahammed🇮🇳 · I. Alekseev🇷🇺 · J. Alford🇺🇸 · A. Aparin🇷🇺 · D. Arkhipkin🇺🇸 · E. C. Aschenauer🇺🇸 · G. S. Averichev🇷🇺 · A. Banerjee🇮🇳 and 323 other authors

   Dihadron angular correlations in $d$+Au collisions at $\sqrt{s_{\mathrm{NN}}}=200$ GeV are reported as a function of the measured zero-degree calorimeter neutral energy and the forward charged hadron multiplicity in the Au-beam direction. A finite correlated yield is observed at large relative pseudorapidity ($\Delta \eta$) on the near side (i.e. relative azimuth $\Delta \varphi \sim 0$). This correlated yield as a function of $\Delta \eta$ appears to scale with the dominant, primarily jet-related, away-side ($\Delta \varphi \sim \pi$) yield. The Fourier coefficients of the $\Delta \varphi$ correlation, $V_n=⟨\cos n\Delta \varphi ⟩$, have a strong $\Delta \eta$ dependence. In addition, it is found that $V_1$ is approximately inversely proportional to the mid-rapidity event multiplicity, while $V_2$ is independent of it with similar magnitude in the forward ($d$-going) and backward (Au-going) directions.

   nucl-exnucl-thPLB(2015)·145 citations
4. 04*

   A new measurement of the neutron detection efficiency for the NaI Crystal Ball detector

   M. Martemianov🇷🇺 · V. Kulikov🇷🇺 · B. T. Demissie🇺🇸 · Z. Marinides🇺🇸 · C. S. Akondi🇺🇸 · J. R. M. Annand🇬🇧 · H. J. Arends🇩🇪 · R. Beck🇩🇪 · N. Borisov🇷🇺 · A. Braghieri🇮🇹 · W. J. Briscoe🇺🇸 · S. Cherepnya🇷🇺 and 59 other authors

   We report on a measurement of the neutron detection efficiency in NaI crystals in the Crystal Ball detector obtained from a study of single p0 photoproduction on deuterium using the tagged photon beam at the Mainz Microtron. The results were obtained up to a neutron energy of 400 MeV. They are compared to previous measurements made more than 15 years ago at the pion beam at the BNL AGS.

   ↳ physics.ins-dethep-exnucl-exJINST(2015)·8 citations
5. 05*

   GPU accelerated image reconstruction in a two-strip J-PET tomograph

   P. Białas🇵🇱 · J. Kowal🇵🇱 · A. Strzelecki🇵🇱 · T. Bednarski🇵🇱 · E. Czerwiński🇵🇱 · A. Gajos🇵🇱 · D. Kamińska🇵🇱 · Ł. Kapłon🇵🇱 · A. Kochanowski🇵🇱 · G. Korcyl🇵🇱 · P. Kowalski🇵🇱 · T. Kozik🇵🇱 and 17 other authors

   We present a fast GPU implementation of the image reconstruction routine, for a novel two strip PET detector that relies solely on the time of flight measurements.

   ↳ physics.ins-detnucl-exActa Phys.Polon.A(2015)·7 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.