A measurement of the differential cross sections for the proton-deuteron elastic scattering and the deuteron breakup in collision with a proton was carried out at Cyclotron Center Bronowice using the BINA detection system. The very preliminary analysis of the experimental data taken at three proton beam energies: 108, 135 and 160 MeV is presented

Ciepał, I.

Jamróz, Barbara

Kalantar-Nayestanaki, N.

Khatri, G.

Kistryn, St.

Kłos, Barbara

Rusnok, Angelina

Stephan, Elżbieta

Wilczek, Andrzej

Acta Physica Polonica B

English

Repozytorium Uniwersytetu Śląskiego RE-BUŚ

             Title: Experimental study of three-nucleon dynamics in proton-deuteron breakup reaction  Author: Angelina Rusnok, I. Ciepał , Barbara Jamróz, N. Kalantar-Nayestanaki, G. Khatri, St. Kistryn, Barbara Kłos, Elżbieta Stephan, Andrzej Wilczek i in.  Citation style: Rusnok Angelina, Ciepał I., Jamróz Barbara, Kalantar-Nayestanaki N., Khatri G., Kistryn St., Kłos Barbara, Stephan Elżbieta, Wilczek Andrzej i in. (2017). Experimental study of three-nucleon dynamics in proton-deuteron breakup reaction. "Acta Physica Polonica B" (Vol. 48, no. 3 (2017), s. 485-488).  Vol. 48 (2017) ACTA PHYSICA POLONICA B No 3EXPERIMENTAL STUDY OF THREE-NUCLEONDYNAMICS IN PROTON–DEUTERONBREAKUP REACTION∗A. Rusnoka, I. Ciepałb, B. Jamróza, N. Kalantar-NayestanakicG. Khatrid, St. Kistrynd, B. Kłosa, A. Kozelab, J. KubośeP. Kulessab, A. Liptake, W. Parolb, I. Skwira-ChalotfE. Stephana, A. Wilczeka, B. Włochb, J. ZejmadaInstitute of Physics, University of Silesia, Katowice, PolandbThe H. Niewodniczański Insitute of Nuclear Physics, PAN, Kraków, PolandcKVI-CART, University of Groningen, Groningen, The NetherlandsdThe M. Smoluchowski Inst. of Physics, Jagiellonian University, Kraków, PolandeFaculty of Physics and Applied Computer ScienceAGH University of Science and Technology, Kraków, PolandfFaculty of Physics, University of Warsaw, Warszawa, Poland(Received December 14, 2016)Ameasurement of the differential cross sections for the proton–deuteronelastic scattering and the deuteron breakup in collision with a proton wascarried out at Cyclotron Center Bronowice using the BINA detection sys-tem. The very preliminary analysis of the experimental data taken at threeproton beam energies: 108, 135 and 160 MeV is presented.DOI:10.5506/APhysPolB.48.4851. MotivationResearch in the domain of few-nucleon systems is the basis for un-derstanding of nuclear interactions and properties of nuclei. The proton–deuteron breakup reaction can serve as a tool for testing modern approachesto describe nuclear interactions between three nucleons [1–3]. At interme-diate energies, below the threshold for pion production, a comparison ofthe data with exact theoretical calculations is possible and effects of thedynamics beyond the pairwise nucleon–nucleon interaction, the so-calledthree-nucleon force (3NF), are significant. Beside the 3NF, the Coulombinteraction and relativistic effects also affect the differential cross section ofthe breakup reaction.∗ Presented at the Zakopane Conference on Nuclear Physics “Extremes of the NuclearLandscape”, Zakopane, Poland, August 28–September 4, 2016.(485)486 A. Rusnok et al.A series of experiments was carried out at KVI Groningen and FZ-Jülichto determine cross section and polarization observables of the 1H(d, pp)n and2H(p, pp)n breakup reactions at intermediate energies [4–10]. The experi-mental data confirmed importance of the 3NF and huge influence of theCoulomb interaction between protons at certain kinematic configurations.There are also regions and observables where pd elastic scattering and/orbreakup reaction data are not well-described by the state-of-the-art theoret-ical calculations. The database for the breakup reaction is still limited instudied energies, which hinders the conclusions on the role of 3NF and onthe deficiencies of the description given by the current models. As a continu-ation of the studies, the measurements are carried out at the new CyclotronCenter Bronowice (CCB, Kraków), at three proton beam energies (108, 135,160 MeV).The combination of large phase space coverage of the BINA detectorsystem and wide range of accessible beam energies provides a unique possi-bility to study various aspects of the dynamics in the three-nucleon system,in regions of their maximum visibility.2. Experiment and preliminary resultsThe BINA detection system is defined by a large angular acceptance andlow-energy threshold for the particle detection [11, 12]. It is composed oftwo detector groups — Wall and Ball. The Wall, covering the forward scat-tering angles (12◦–35◦ in the lab-frame), consists of a multiwire proportionalchamber (MWPC) and scintillation hodoscope system ∆E–E. MWPC pro-vides information for exact reconstruction of the momentum direction ofthe charged particles, whereas the ∆E–E system is applied for charged par-ticle identification and total energy measurement. The backward angles(35◦–160◦ in the lab-frame) are covered by the second detector group, Ball,consisting of 149 “phoswich”-type scintillation detectors dedicated to mea-surement of the particle energy and to approximate determination of themomentum direction. The liquid D2 target is located inside the Ball detec-tor which serves also as a vacuum chamber.The first data have been collected for elastic scattering and the pdbreakup reaction at three proton beam energies: 108, 135 and 160 MeV. TheBall part was not fully operational at the time of the measurements, so thepreliminary analysis is devoted to checking consistency of the data collectedin the Wall part. The high efficiency of MWPC has been demonstrated. Asample particle identification spectrum, obtained for one “virtual telescope”,i.e. the combination of overlapping elements of the ∆E and E detectors,is presented in Fig. 1 (left panel). Proton and deuteron bands and spotsare well-visible allowing for clear definition of corresponding graphical cuts.The simplified energy calibration has been applied leading to a proper dis-Experimental Study of Three-nucleon Dynamics in Proton–Deuteron . . . 487tribution of proton–proton coincidences along the corresponding three-bodybreakup reaction kinematics (see Fig. 1 (right panel)). The clean spectrumbelow the breakup kinematics proves low level of accidental coincidences.The number of events collected at beam energy of 108 MeV corresponds toan average statistical accuracy of about 4–5% in one bin (defined by the binsin the proton emission angles: ∆θ1 = ∆θ2 = 2◦, ∆φ12 = 10◦ and the bin inenergy of 2 MeV).Fig. 1. Left panel: Sample particle identification spectrum measured with onevirtual telescope at the beam energy of 135 MeV — a proton band and a deuteronspot are very well-separated. Right panel: Kinematical spectrum measured for asample configuration of the proton pair (θ1 = θ2 = 20◦, φ12 = 140◦) originatingfrom the breakup reaction; data measured at the beam energy of 108 MeV.Fig. 2. Particles registered in the Wall presented on the plane of polar angle ver-sus energy. The spectra have been produced separately for particles identified asprotons (left panel) and deuterons (right panel); the lines represent dependencescalculated for elastic scattering kinematics at 108 MeV.488 A. Rusnok et al.After the PID selection, energy versus angle θ dependences have beenchecked for protons and deuterons separately, see Fig. 2. Bands of elasticallyscattered protons and deuterons are in agreement with the correspondingkinematical curves.3. OutlookThe very preliminary analysis of the data taken with the BINA detectorat CCB demonstrates a proper and efficient functioning of the forward partof this detector. The aim of the further analysis is to obtain differentialcross section of the breakup reaction at 108 MeV as a function of kinematicvariables. In a first step, a number of angular configurations of outgoingprotons will be chosen. The absolute normalization relies on the elasticscattering data measured in parallel to the breakup reaction and the knownelastic scattering cross section [13].This work was partially supported by the Polish National Science Center(NCN) from grant DEC-2012/05/B/ST2/02556 .REFERENCES[1] St. Kistryn, E. Stephan, J. Phys. G: Nucl. Part. Phys. 40, 063101 (2013).[2] K. Sagara, Few-Body Syst. 48, 59 (2010).[3] N. Kalantar-Nayestanaki, E. Epelbaum, J.G. Meschendorp, A. Nogga, Rep.Prog. Phys. 75, 016301 (2012).[4] St. Kistryn et al., Phys. Rev. C 68, 054004 (2003).[5] St. Kistryn et al., Phys. Rev. C 72, 044006 (2005).[6] E. Stephan et al., Phys. Rev. C 82, 014003 (2010).[7] M. Eslami-Kalantari et al., Mod. Phys. Lett. A 24, 839 (2009).[8] H. Mardanpour et al., Phys. Lett. B 687, 149 (2010).[9] I. Ciepał et al., Few-Body Syst. 56, 665 (2015).[10] I. Ciepał et al., Phys. Rev. C 85, 017001 (2012).[11] St. Kistryn, E. Stephan, J. Phys. G: Nucl. Part. Phys. 40, 063101 (2013).[12] A. Ramazani-Moghaddam-Arani et al., Phys. Rev. C 78, 014006 (2008).[13] K. Ermish et al., Phys. Rev. C 68, 051001(R) (2003).

Experimental study of three-nucleon dynamics in proton-deuteron breakup reaction

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Experimental study of three-nucleon dynamics in proton-deuteron breakup reaction

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