DOCSLIB.ORG

Halo Or Skin in Zr-Isotopes Harvinder Kaur, Sarabjeet Kaur, and M

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Halo Or Skin in Zr-Isotopes Harvinder Kaur, Sarabjeet Kaur, and M Proceedings of the DAE Symp. on Nucl. Phys. 62 (2017) 350 Halo or Skin in Zr-Isotopes Harvinder Kaur, Sarabjeet Kaur, and M. S. Mehta∗ Department of Physics, Rayat Bahra University, Mohali-140 104, INDIA Introduction to the continuum, the Borromean structure etc. In the past, several theoretical models The information of properties of neutron-rich in relativistic kinematics such as Hartree Bo- (in particular) nuclei in the region away from goliubov with or without the Fock term, Rel- β-stability line is becoming more and more ativistic Mean Field model with hartree ap- clear with the availability of more energetic proximation have been developed for a self- radioactive beams of short-lived nuclei of consistent description of spherical as well as the rare isotope. In the recent decades, deformed halo nuclei. the studies of nuclear structure has made a considerable progress by exploring new phe- nomena that opened up the new frontiers in Very recently, the nuclear reaction cross- sections of 19,20,22C [3] nuclei are measured the field. The density distribution of nucleons 22 is an important observable of nucleus which and it is shown that C nucleus has halo gives information of a nucleus . The density structure. This drip-line nucleus is reported 42,44 distribution of nuclei towards the drip-line is to be two neutron halo nucleus. Also, Mg quite different to the one near the β-stability nuclei which are close to neutron drip-line have been predicted as showing halo structure line. A significant character in nuclei at the 11 19 31 extreme is the existence of nuclear halos and [4, 5]. The nuclei Be, C, Ne are the ex- skins [1]. This exotic property of nuclei in amples of one-neutron halo [6, 7]. Usually, light mass region was first observed by I. halo is the name given to the long extended Tanihata et al. [2], experimentally, in 1985 low density tail in the nuclear matter distri- for 11Li. bution, which results in larger radius. On the other hand, the neutron skin is the significant The definition of a halo nucleus is still be- difference in the values of matter radii for neu- ing debated. The large value of N/Z ratio trons and protons. The neutron skin, qualita- in unstable nuclei produces a large difference tively, describes an excess of neutrons at the in Fermi energy of neutrons and protons, and nuclear surface. Recently, the skin thickness thus, decoupling of neutron and proton distri- is calculated [8] for 208Pb and its correlation butions appears as halos and/ or skins. The with the slope of symmetry energy. halo structure in nuclei can appear when the system reaches the threshold and the role of long-range repulsive force on relative motion In the present work we employ axially de- of particle becomes less. As a result the tail formed relativistic mean field model with NL3 of wave function extends farther away from parameterization to calculate the neutron the region of nuclear interaction, thereby pro- and proton density distributions. ducing an unusual extended region of low nu- clear density distribution. The other interest- ing features in nuclei close to neutron drip-line are, for example, the largely extended spatial Formalism density distribution, coupling of bound states The Relativistic Mean Field formalism is used here to investigate the decay properties of superheavy nuclei. The Lagrangian density ∗Electronic address: [email protected] as given by, Available online at www.sympnp.org/proceedings Proceedings of the DAE Symp. on Nucl. Phys. 62 (2017) 351 -10 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 -1 10 10 -2 132 -2 10 n Zr 10 1 1 p 130 µ µ 2 2 -3 Zr -3 L = ψi{iγ ∂µ − M}ψi + ∂ σ∂µσ − mσσ 10 10 2 2 -4 -4 10 10 1 3 1 4 1 µν 2 3 ) -2 -2 − g σ − g σ − g ψ ψ σ − Ω Ω -3 s i i µν 10 134 136 10 Zr Zr 3 4 4 (fm n,p -3 -3 1 2 µ 1 µ 2 µ ρ 10 10 + m V Vµ + c3(VµV ) − gwψ γ ψiVµ w i -1 -1 2 4 10 10 -2 -2 1 1 2 138 µν µ µ µ 10 Zr 140 10 − B~ .B~ µν + m R~ .R~ µ − gρψ γ ~τψi.R~ Zr ρ i -3 -3 4 2 10 10 -4 -4 1 (1 − τ3) 10 10 − F µν F − eψ γµ ψ A 0 1 2 3 4 5 6 7 8 9 10 11 12 1 2 3 4 5 6 7 8 9 10 11 12 4 µν i 2 i µ r (fm) where ψ is Dirac spinor for nucleon and M is FIG. 1: The density distribution for even-even 130−140 mass of nucleon. The quantities mσ,mω, and Zr nuclei using NL3 parameter set. mρ are the masses of σ, ω, and ρ. The non- linear self interaction coupling of σ mesons is denoted by g2 and g3. In the present calcu- lations, we employ NL3 parameterization for considered here has extended tail as compared meson-baryon coupling. to proton density. The extension in neutron density is ≥ 2.5 fm at the outer region of nu- Results and Discussion clei. Such a long tail indicates the halo (or near halo) nature of these nuclei. At the cen- The halo and/or skin in nuclei is a threshold tral region the neutron density is compara- effect that arises due to a very weak binding tively larger than the proton density, which of the last one or two valence nucleons and shows Coulomb repulsion among protons. In 130−140 hence get decoupled from the rest of nucleons the isotopic series Zr most of the nu- in nucleus. The variation of neutron and clei are spherical or near spherical and oblate proton densities as a function of distance deformed. from the nucleus gives the insight of the distribution of nucleons near the surface of nucleus. The tail part of density distribution is important as far as the skin and halo References structure is concerned. [1] I. Tanihata, J. Phys. G: Nucl. Part. Phys. The baryon density is calculated by the re- 22, 157, (1996). lation given by, [2] I. Tanihata, et al., Phys. Rev. Lett. 55, 2676, (1985). A et al. 104 † [3] K. Tanaka, , Phys. Rev. Lett., , ρv(r) = X ψi (r)ψi(r) 062701, (2010). i=1 [4] L. Li, et al., Phys. Rev. C 85, 024312, The baryon density is the sum of squares of (2012). large and small components of Dirac spinors [5] Zhou, et al., Phys. Rev. C 82, 011301(R), and is normalized to nucleon number. (2010). In the present work, we calculate the neu- [6] T. Nakamura, et. al., Phys. Rev. Lett., tron and proton density distributions for even- 103, 262501, (2009). even Zr-isotopes (130−140Zr) using axially de- [7] A. Di Pietro, et. al., Phys. Rev. Lett., 105, formed relativistic mean field model. The den- 022701, (2010). sity distribution of neutron and proton is plot- [8] M. Warda, M. Centelles, X. Vi˜nas, and X. ted in figure 1. From the figure it is clearly vis- Roca Maza, Acta Phys. Pol. B 43, 209, ible that the neutron density for all isotopes (2012). Available online at www.sympnp.org/proceedings.
Load more

Recommended publications
  • Studies on Different Halo Nuclei Models
    ISSN: 2347-3215 Volume 2 Number 3 (March-2013) pp. 169-173 www.ijcrar.com Studies on different halo nuclei models B.M.Fulmante1* and Sharma Umashankar2 1Head, Department of Physics, Sanjeevani Mahavidyalaya , Chapoli, Dist. Latur (M.S), India 2RJIT, BSF, Tekanpur, Gwalior (M.P.), India *Corresponding author KEYWORDS A B S T R A C T Halo nuclei; In the present work were showed different existing halo nuclei models and Carbon-22, compared their results. It also includes the necessity of the research on the Borromean ring; halo nuclei. Previous Discovery, Recent discovery and the remarkable points Li halo; about the limitations in the research. The differences in the properties of halo Oxygen-23; nuclei are also concluded in paper. The study of heaviest halo carbon22 Be, He, and calcium; nuclei, Be, He, Oxygen23 and calcium are also incorporated in the present Magic isotopes etc. study. This paper also includes Historical back ground. Recent discovery of the Heaviest Halo carbon nuclei-22, Comparative description of Be, He, Halo Oxygen23 and calcium etc. Introduction Halo nuclei are very weakly-bound exotic halo nucleons tend to be in low relative states of nuclear matter in which the outer orbital. The field of halo nuclei represents a one or two valence nucleons (usually paradigm shift in the study of nuclear neutrons) are spatially decoupled from a structure and is still regarded as a hot relatively tightly bound core such that they topic almost twenty years after their spend more than half their time beyond the discovery. But when did the field actually range of the binding nuclear potential.
    [Show full text]
  • Nuclear Physics: the ISOLDE Facility
    Nuclear physics: the ISOLDE facility Lecture 1: Nuclear physics Magdalena Kowalska CERN, EP-Dept. [email protected] on behalf of the CERN ISOLDE team www.cern.ch/isolde Outline Aimed at both physics and non-physics students This lecture: Introduction to nuclear physics Key dates and terms Forces inside atomic nuclei Nuclear landscape Nuclear decay General properties of nuclei Nuclear models Open questions in nuclear physics Lecture 2: CERN-ISOLDE facility Elements of a Radioactive Ion Beam Facility Lecture 3: Physics of ISOLDE Examples of experimental setups and results 2 Small quiz 1 What is Hulk’s connection to the topic of these lectures? Replies should be sent to [email protected] Prize: part of ISOLDE facility 3 Nuclear scale Matter Crystal Atom Atomic nucleus Macroscopic Nucleon Quark Angstrom Nuclear physics: femtometer studies the properties of nuclei and the interactions inside and between them 4 and with a matching theoretical effort theoretical a matching with and facilities experimental dedicated many with better and better it know to getting are we but Today Becquerel, discovery of radioactivity Skłodowska-Curie and Curie, isolation of radium : the exact form of the nuclear interaction is still not known, known, not still is interaction of nuclearthe form exact the : Known nuclides Known Chadwick, neutron discovered History 5 Goeppert-Meyer, Jensen, Haxel, Suess, nuclear shell model first studies on short-lived nuclei Discovery of 1-proton decay Discovery of halo nuclei Discovery of 2-proton decay Calculations with
    [Show full text]
  • Nuclear Charge Radius Determination of the Halo Nucleus Be-11
    Nuclear charge radius determination of the halo nucleus Be-11 Monika Žáková, Johannes Gutenberg-Universität Mainz 6 7 2 3 1 1 1 M. Bissell , K. Blaum , Ch. Geppert , M. Kowalska , J. Krämer , A. Krieger , R. Neugart , W. Nörtershäuser1,2 , R. Sanchez1, F. Schmidt-Kaler4, D. Tiedemann1, D. Yordanov7, C. Zimmermann5 1 Johannes Gutenberg-Universität Mainz, Germany Laser Spectroscopy of Highly Charged 2 GSI Darmstadt, Germany Ions and Exotic Radioactive Nuclei 3 CERN (Helmholtz Young Investigators Group) 4 Universität Ulm, Germany 5 Eberhard-Karls Universität Tübingen, Germany 6 Instituut voor Kern- en Stralingsfysica, Leuven 7Max Planck Institut für Kernphysik, Heidelberg http://www.kernchemie.uni-mainz.de/laser/ Outline ► Halo Nuclei ► Isotope Shift ► Collinear Laser Spectroscopy ► Results Halo Nuclei 3 Isotope Shift → Nuclear Charge Radius ► Charge radius – proton distribution ► Nuclear model – independent Isotop 1 Δν Absorption IS spectra Isotop 2 ΔνIS = ΔνMS + ΔνFS 4 Isotope Shift ΔνIS = ΔνMS + ΔνFS meausrements calculations charge radius ≈10 GHz ≈1 MHz ► Calculations up to three e- system Be+ Z.-C. Yan et al., Phys. Rev. Lett., 100, 243002 (2008) M. Puchalski, K. Pachucki Phys. Rev A 78, 052511 (2008) 5 Isotope Shift ΔνIS = ΔνMS + ΔνFS meausrements calculations charge radius ≈10 GHz ≈1 MHz r 2 Δν = 2πZeΔ|ψ(0)|2 2 FS 3 δ r V(r) field shift coefficient C - calculations Z.-C. Yan et al., Phys. Rev. Lett., 100, 243002 (2008) M. Puchalski, K. Pachucki Phys. Rev A 78, 052511 (2008) 6 6He, 8He ► 6He, 8He – isotope shifts measurements in magneto optical trap, Argonne National Lab, GANIL P. Müller et al., Phys. Rev.
    [Show full text]
  • Arxiv:2001.01849V2 [Nucl-Th] 21 Feb 2020 Rich Medium-Mass Isotopes of Ne, Na and Mg [4]
    Exploring two-neutron halo formation in the ground-state of 29F within a three-body model Jagjit Singh,1, ∗ J. Casal,2, 3, y W. Horiuchi,4 L. Fortunato,2, 3 and A. Vitturi2, 3 1Research Center for Nuclear Physics (RCNP), Osaka University, Ibaraki 567-0047, Japan 2Dipartimento di Fisica e Astronomia \G.Galilei", Universit`adegli Studi di Padova, via Marzolo 8, Padova, I-35131, Italy 3INFN-Sezione di Padova, via Marzolo 8, Padova, I-35131, Italy 4Department of Physics, Hokkaido University, Sapporo 060-0810, Japan (Dated: February 24, 2020) Background: The 29F system is located at the lower-N boundary of the \island of inversion" and is an exotic, weakly bound system. Little is known about this system beyond its two-neutron separation energy (S2n) with large uncertainties. A similar situation is found for the low-lying spectrum of its unbound binary subsystem 28F. Purpose: To investigate the configuration mixing, matter radius and neutron-neutron correlations in the ground- state of 29F within a three-body model, exploring the possibility of 29F to be a two-neutron halo nucleus. Method: The 29F ground-state wave function is built within the hyperspherical formalism by using an analytical transformed harmonic oscillator basis. The Gogny-Pires-Tourreil (GPT) nn interaction with central, spin-orbit and tensor terms is employed in the present calculations, together with different core + n potentials constrained by the available experimental information on 28F. Results: The 29F ground-state configuration mixing and its matter radius are computed for different choices of 28 the F structure and S2n value. The admixture of d-waves with pf components are found to play an important role, favouring the dominance of dineutron configurations in the wave function.
    [Show full text]
  • Journal of Nuclear Physics, Material Sciences, Radiation and Applications Journal Homepage
    J. Nucl. Phys. Mat. Sci. Rad. A. Vol. 8, No. 1 (2020), pp.11–24 Journal of Nuclear Physics, Material Sciences, Radiation and Applications Journal homepage: https://jnp.chitkara.edu.in/ Theoretical Study on the Formation of 1-neutron and 2-neutron Halo Nuclei via Decay of Elements in Super-Heavy Region K. Prathapan1 , K.P. Anjali2 and R.K. Biju3 1, 2, 3Department of Physics, Government Brennan College, Thalassery, Kerala-670106, India 3Department of Physics, Pazhassi Raja N.S.S. College, Mattannur, Kerala-670702, India [email protected] [email protected] [email protected] (Corresponding Author) ARTICLE INFORMATION ABSTRACT Received: June 18, 2020 The decay characteristics of 1-neutron and 2-neutron halo nuclei from 270-316116, 272-318118 and 278-320120 Revised: August 31, 2020 even-even nuclei is studied within the frame work of the Coulomb and Proximity Potential Model Accepted: September 08, 2020 (CPPM). Halo structure in neutron rich nuclei is identified by calculating the neutron separation Published Online: November 09, 2020 energies and on the basis of potential energy considerations. A comparison of the decay half-life is made by considering the halo nuclei as spherical cluster and as deformed nuclei with a rms radius. Further, neutron shell closure at neutron numbers 150, 164 and 184 is identified form the plot of -1/2 Keywords: log10T1/2 verses the neutron number of parents. The plots of Q verses log10 T1/2 and -ln P verses Halo Nuclei, Cluster Radioactivity log10T1/2 for various halo nuclei emitted from the super-heavy elements are found to be linear showing that Geiger-Nuttall law is applicable to the emission of neutron halo also.
    [Show full text]
  • Nuclear Charge Radius of the Halo Nucleus Lithium-11
    Nuclear Charge Radius of the Halo Nucleus Lithium-11 Dissertation zur Erlangung des Grades \Doktor der Naturwissenschaften" am Fachbereich Physik, Mathematik und Informatik der Johannes Gutenberg-Universit¨at in Mainz Rodolfo Marcelo S´anchez Alarc´on geboren in La Paz, Bolivien Mainz, den 2006 Zusammenfassung Kernladungsradien kurzlebiger Isotope k¨onnen nur durch die Messung der Isotopie- verschiebung kernmodellunabh¨angig bestimmt werden. Dazu wurde an der Gesellschaft fur¨ Schwerionenforschung (GSI), Darmstadt eine neuartige Technik entwickelt. Diese 2 2 kombiniert Zweiphotonen-Spektroskopie des 2s S1=2 ! 3s S1=2-Ub¨ ergangs mit Resonanz- Ionization und einem Nachweis durch Quadrupol-Massenspektrometrie. Auf diese Weise wird sowohl fur¨ eine Bestimmung der Kernladungsradien die notwendige Genauigkeit 5 4 von 5 × 10− als auch eine Effizienz von 10− erreicht. Im Rahmen dieser Arbeit ist es mit der Methode gelungen am TRIUMF Institut (Vancouver) erstmals die Isotopiev- erschiebung des Isotops 11Li zu messen. Darub¨ erhinaus konnte die Genauigkeit fur¨ die anderen Lithiumisotope gegenub¨ er fruheren¨ Messungen an der GSI um etwa einen Fak- tor vier verbessert werden. Die Resultate wurden mit den neuesten Berechnungen des Masseneffekts in Drei-Elektronen-Systemen kombiniert, um die mittleren quadratischen Ladungsradien aller Lithium-Isotope, insbesondere des Zwei-Neutronen-Halokerns 11Li, zu bestimmen. Die erhaltenen Radien nehmen von 6Li bis 9Li kontinuierlich ab, w¨ahrend der Radius von 9Li zu 11Li stark ansteigt. Dies wird mit verschiedenen Kernmodellen ver- glichen, von denen ein Multicluster-Modell die beste Ub¨ ereinstimmung zeigt. In diesem Modell wird der Anstieg des Kernladungsradius zwischen 9Li und 11Li haupts¨achlich durch intrinsische Anregungen des 9Li-Rumpfes verursacht, w¨ahrend die Korrelation der Halo Neutronen nur eine untergeordnete Rolle spielt.
    [Show full text]
  • Scattering and Reactions of Halo Nuclei
    Lectures presented at the VII Hispalensis International Summer School, Nuclear Physics 2000: Masters’ Lessons, Oramana, Sevilla, Spain, June 11-23, 2000 Scattering and Reactions of Halo Nuclei Ronald C. Johnson1 Department of Physics, School of Physics and Chemistry, University of Surrey, Guildford, Surrey, GU2 7XH, UK Abstract. In these lectures I describe some of the key features of halo nuclei and how these features require a re-think of theories required to adequately describe their collisions with stable nuclei. I provide the basic scattering theory needed to understand few-body models of halo crosssections. The ‘frozen halo’ approximation is explained in detail and applications of the theory to elastic scattering, break-up and transfer reactions are discussed. 1 Introduction Several times in the lectures at this Summer School we have been shown a picture of the N-Z plane with the valley of stability displayed and an indication of the position of the neutron and proton drip lines. There has been some emphasis on the properties of medium mass and heavy nuclei far from the valley of stability. My lectures will be mainly concerned with the neutron dripline in the region of small N and Z where very different types of phenomena occur and theories emphasise a different set of degrees of freedom than is usual in heavy nuclei. One of the most exciting scientific developments in recent years has been the advent of accelerated beams of radioactive nuclei with exotic combinations of neutron and proton numbers. The new techniques produce beams of nuclei which decay by the weak interaction but are stable against decay into their constituents.
    [Show full text]
  • Study of Nuclear Structure with Rare Isotope's
    New Physics: Sae Mulli, Vol. 66, No. 12, December 2016, pp. 1537∼1542 http://dx.doi.org/10.3938/NPSM.66.1537 Study of Nuclear Structure with Rare Isotope’s Seonho Choi∗ Department of Physics & Astronomy, Seoul National University, Seoul 08826, Korea (Received 16 November 2016 : revised 7 December 2016 : accepted 7 December 2016) With the advent of next generation rare isotope (RI) accelerators, nuclear physics is receiving new attention worldwide. The RAON of Korea will play an important role in international research activities. Isotopes far from the valley of stability provide new, interesting phenomena, which have never been observed in ordinary, stable nuclei. At the same time, the study of these unstable nuclei will provide deep insight into understanding the nucleus, a strongly-bound system of protons and neutrons. The new knowledge obtained from the study of rare, unstable isotopes will play an important role in nuclear structure, nuclear reaction dynamics, nuclear astrophysics, etc. This review will focus on the aspects of the study of nuclear structure that can be accressed at next- generation RI accelerators, including RAON. PACS numbers: 81.05.Ea, 85.30.Tv Keywords: Neutron-rich isotopes, Halo nucleus, Evolution of shell structure, Beta-delayed gamma ray spec- troscopy, Nuclear structure I. NUCLEAR PHYSICS AND NUCLEI FAR 1960’s, thanks to the development of heavy ion accelera- FROM THE STABILITY LINE tors, it has been possible to produce various nuclei in ex- treme conditions: high temperature, high density and/or Nuclear physics can be stated as the study of sys- high spin states and our knowledge on nuclei has been tem of strongly interacting particles, although over- enlarged.
    [Show full text]
  • Is a Neutron Halo Nothing but a Large Neutron Skin?
    Is a neutron halo nothing but a large neutron skin? Fumiyo Uchiyama University of Tsukuba∗, 1-1-1 Tennodai, Tsukuba, Japan 305† November 12, 2018 Abstract We discuss the difference between neutron halos and neutron skins matching to our usual thinking of a skin as being connected to a body whereas a halo is, in some sense, disconnected from the body. We emphasize that the existence of one or more neutrons behaving incoherently with respect to the rest of the nucleons in a nucleus can match the picture of a neutron halo. 1 Introduction arXiv:nucl-th/0309080v2 7 Oct 2005 In 1967, D. Wilkinson[1] suggested that in neutron rich nuclei, a few neutron might be loosely bound forming ”halos”. Though it was unclear what precisely was meant by this terms, in the ’80 the unusual result concerning the structures in longitudinal momentum distribution [2] in 9Li fragments from neutron rich 11Li led physicists[3] to consider the possibility of 11Li being one of these new “halo” nuclei. This is because, at the time, in high energy ( 1Gev/c)heavy ion experiments[4] , ≥ it was known that momentum distributions of fragments produced peripherally from ordinary stable nuclei such as 16O in peripheral interactions were Gaussian whose widths were statistical averages of Fermi motions of the nucleons in the nuclei[5] (200-350MeV/c) while that of 11Li was well fitted ∗Former Professor †Present mailing address: P.O.Box 14932, Berkeley California, USA 94712 1 by the sum of two Gaussian of a narrow width( 70 MeV/c) and an ordinary width.
    [Show full text]
  • Neutron Halo Structure Probed by Breakup Reactions
    Rutherford Centennial Conference on Nuclear Physics IOP Publishing Journal of Physics: Conference Series 381 (2012) 012014 doi:10.1088/1742-6596/381/1/012014 Neutron Halo Structure Probed by Breakup Reactions Takashi Nakamura Department of Physics, Tokyo Institute of Technology, 2-12-1 O-Okayama, Meguro, Tokyo 152-8551 E-mail: [email protected] Abstract. The neutron drip line represents the boundary of nuclei in the neutron-rich side of the nuclear chart. In the vicinity of the neutron drip line, we often observe 'neutron halo' structure. We discuss how the neutron halo nuclei are studied by the breakup reactions at relativistic energies. Coulomb breakup is the dominant process in the breakup with a heavy target, such as Pb. In the Coulomb breakup of halo nuclei, enhancement of the electric dipole strength at low excitation energies (soft E1 excitation) is observed as a unique property for halo nuclei. The mechanism of the soft E1 excitation and its spectroscopic significance is shown as well as the applications of the Coulomb breakup to the very neutron rich 22C and 31Ne, which was measured at 230-240 MeV/nucleon at the new-generation RI beam facility, RIBF(RI Beam Factory), at RIKEN. Evidence of halo structures for these nuclei is provided as enhancement of the inclusive Coulomb breakup, which is a useful tool for the low-intense secondary beam. We also show that the breakup with a light target (C target), where nuclear breakup is a dominant process, can be used to extract the spectroscopic information of the removed neutron. The combinatorial analysis was found very useful to extract more-detailed information such as the spectroscopic factor and the separation energy.
    [Show full text]
  • Halo Effects in the Low-Energy Scattering of 15C with Heavy Targets∗
    Vol. 51 (2020) Acta Physica Polonica B No 3 HALO EFFECTS IN THE LOW-ENERGY SCATTERING OF 15C WITH HEAVY TARGETS∗ J.D. Ovejasa, A. Knyazevb, I. Martelc;d, O. Tengblada M.J.G. Borgea, J. Cederkällb, N. Keeleye, K. Rusekf C. García-Ramosd, L.A. Acostag, A.A. Arokiarajh, M. Baboh T. Cape, N. Ceyland, G. de Angelisi, A. Di Pietroj J.P. Fernándezj, P. Figueraj, L. Frailek, H. Fynbol, D. Galavizm J.H. Jensenl, B. Jonsonn, R. Kotako, T. Kurtukianp M. Madurgaq, G. Marquínez-Duránd, M. Munchl, A.K. Orduzr R. Honóriom, A. Pakous, T. Pérezd, L. Peraltam, A. Pereaa R. Raabeh, M. Renaudh, K. Riisagerl, A.M. Sánchez-Benítezd J. Sánchez-Segoviad, O. Sgouross, V. Soukerass, P. Teubigm S. Viñalsa, M. Wolińska-Cichockaf , R. Wolskit, J. Yangh aInstituto de Estructura de la Materia — CSIC, Madrid bLund University, Sweden cUniversity of Liverpool, UK dUniversity of Huelva, Spain eNational Centre for Nuclear Research, Poland f Heavy Ion Laboratory, University of Warsaw, Poland gInstituto de Física UNAM, Mexico hKU Leuven, Belgium iINFN Laboratori Nazionali di Legnaro, Italy jINFN Laboratori Nazionali del Sud, Italy kUniversidad Complutense de Madrid, Spain lAarhus University, Denmark mLIP Lisbon, Portugal nChalmers University of Technology, Sweden oQueen’s University Belfast, UK pCentre d’Etudes Nucléaires de Bordeaux Gradignan, France qTexas A&M University, USA rGANIL, France sDepartment of Physics and HINP, Greece tInstitute of Nuclear Physics Polish Academy of Sciences, Poland (Received January 15, 2020) ∗ Presented at the XXXVI Mazurian Lakes Conference on Physics, Piaski, Poland, September 1–7, 2019. (731) 732 J.D. Ovejas et al.
    [Show full text]
  • Explorations at and Beyond the Neutron Dripline”
    EXPAND – CS IN2P3 June 2019 1 EXPAND: “Explorations at and beyond the neutron dripline” SUMMARY The objective of the EXPAND project is to investigate, using the RIBF1 facility at RIKEN (Saitama, Japan), the structure of light neutron-rich nuclei lying at and beyond the neutron dripline and to search for new phenomena. The RIBF provides unique possibilities for such experiments as it can provide the most intense secondary beams of light neutron dripline nuclei in the world – typically three or four orders of magnitude higher than any other facility. The technical aspects of EXPAND focus on augmenting the neutron detection capabilities of the SAMURAI setup, which are critical to the study of nuclei at and beyond the dripline. Specifically the existing two-wall neutron array (NEBULA2) is being transformed by augmenting the number of scintillator modules and associated walls so as to create the NEBULA-Plus array. This will enable 3 and 4 neutron detection to be routinely possible, as well as increasing dramatically the single and two- neutron detection efficiencies. The present document outlines the physics case for EXPAND. The status of the development of NEBULA-Plus as well as the experimental work that has gone on in parallel with the existing SAMURAI setup, including the NEBULA array supplemented with a NeuLAND demonstrator3, is also presented. INTRODUCTION & MOTIVATION The exploration and understanding of the structure of the most neutron-rich nuclei is one of the primary goals of present day nuclear physics. The light mass region (A<40) offers the most promising possibilities in this respect: not only are a variety of well-developed theoretical models available (shell model, shell model in the continuum and various ab intio approaches), but from experimental point of view it has become possible to access nuclei at and beyond the neutron dripline.
    [Show full text]