Alpha-cluster Condensations in Nuclei and Experimental Approaches for their Studies

The formation of alpha-clusters in nuclei close to the decay thresholds is discussed. These states can be considered to be boson-condensates, which are formed in a second order phase transition in a mixture of nucleons and alpha-particles. The de Broglie wavelength of the alpha-particles is larger than the nuclear diameter, therefore the coherent properties of the alpha-particles give particular effects for the study of such states. The states are above the thresholds thus the enhanced emission of multiple-alphas into the same direction is observed. The probability for the emission of multiple-alphas is not described by Hauser-Feshbach theory for compound nucleus decay.Comment: 21 pages, 12 figures

Collinear ternary cluster decay of hyperdeformed 60Zn at high angular momentum

Binary and ternary cluster decay of 60]Zn compound nuclei at high angular momentum, formed in the 36Ar 24]Mg reactions at E lab] 36Ar 195 MeV, has been measured in a unique kinematic coincidence setup consisting of two large area position sensitive x,y gas detector teleskope with Bragg ionisation chambers BRS . The BRS provides the opportunity to measure the reaction angles in and out of plane, and through Bragg curve spectroscopy to achieve a complete identification of the nuclear charge for different final channels. We observed very narrow out of plane angular correlations for two heavy fragments emitted either in purely binary events or in events missing mass consisting of 2 and 3 particles. These narrow correlations are interpreted as ternary fission decay from compound nuclei at high angular momenta through an elongated hyperdeformed shape with a very large moment of inerta. In these stretched configurations, the lighter mass in the neck region remains at rest or with very low momentum in the center of mas

Implementation of TTIK method and time of flight for resonance reaction studies at heavy ion accelerator DC-60

Abstract To study resonance reactions of heavy ions at low energy we have combined the Thick Target Inverse Kinematics Method (TTIK) with Time of Flight method (TF). We used extended target and TF to resolve the identification problems of various possible nuclear processes inherent to the simplest popular version of TTIK. Investigations of the 15N interaction with hydrogen and helium gas targets by using this new approach are presented

Technical design report for the upgrade of the ALICE inner tracking system

ALICE (A Large Ion Collider Experiment) is studying the physics of strongly interacting matter, and in particular the properties of the Quark-Gluon Plasma (QGP), using proton-proton, proton-nucleus and nucleus-nucleus collisions at the CERN LHC (Large Hadron Collider). The ALICE Collaboration is preparing a major upgrade of the experimental apparatus, planned for installation in the second long LHC shutdown in the years 2018-2019. A key element of the ALICE upgrade is the construction of a new, ultra-light, high-resolution Inner Tracking System (ITS) based on monolithic CMOS pixel detectors. The primary focus of the ITS upgrade is on improving the performance for detection of heavy-flavour hadrons, and of thermal photons and low-mass di-electrons emitted by the QGP. With respect to the current detector, the new Inner Tracking System will significantly enhance the determination of the distance of closest approach to the primary vertex, the tracking efficiency at low transverse momenta, and the read-out rate capabilities. This will be obtained by seven concentric detector layers based on a 50 \uce\ubcm thick CMOS pixel sensor with a pixel pitch of about 30\uc3\u9730 \uce\ubcm2. This document, submitted to the LHCC (LHC experiments Committee) in September 2013, presents the design goals, a summary of the R&D activities, with focus on the technical implementation of the main detector components, and the projected detector and physics performance. \uc2\ua9 2014 CERN on behalf of The ALICE Collaboration