Experimental apparatus for the study of small angle neutron-proton elastic scattering at intermediate energies

Vorobyov, A. A.; Korolev, G.A.; Dobrovolsky, A. V.; Khanzadeev, A.; Petrov, G.E.; Spiridenkov, E.; Terrien, Y.; Lugol, J.C.; Saudinos, J.; Silverman, B.H.; Wellers, F.

doi:10.1016/0168-9002(88)90710-3

Cited by 19 publications

(4 citation statements)

References 17 publications

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“…In order to study exotic nuclei, it was proposed at the Petersburg Nuclear Physics Institute (PNPI) [5] to perform experiments in inverse kinematics, in which case beams of exotic nuclei are scattered on a hydrogen target, using the IKAR ionization spectrometer developed and fabricated at PNPI. Earlier, the IKAR spectrometer [6,7] was successfully used in experiments on small-angle elastic hadron scattering [8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the structure of light exotic nuclei by proton elastic scattering in inverse kinematics

et al. 2015

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In order to study the spatial structure of exotic nuclei, it was proposed at the Petersburg Nuclear Physics Institute (PNPI) to measure the differential cross section for small-angle proton elastic scattering in inverse kinematics. Several experiments in beams of 0.7-GeV/nucleon exotic nuclei were performed at the heavy-ion accelerator facility of GSI (Gesellschaft f¨ur Schwerionenforschung, Darmstadt, Germany) by using the IKAR ionization spectrometer developed at PNPI. The IKAR ionization chamber filled with hydrogen at a pressure of 10 bar served simultaneously as a target and as a recoil-proton detector, which measured the recoil-proton energy. The beam-particle scattering angle was also measured. The results obtained for the cross sections in question were analyzed on the basis of the Glauber-Sitenko theory using phenomenological nuclear-density distributions with two free parameters. Nuclear-matter distributions and root-mean-square radii were found for the nuclei under investigation. The size of the halo in the 6 Не, 8 Не, 11 Li, and 14 Ве nuclei was determined among other things. Information about neutron distributions in nuclei was deduced by combining the data obtained here with the known values of the radii of proton distributions. A sizable neutron skin was revealed in the 8 Li, 9 Li, and 12 Be nuclei.

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Section: Introductionmentioning

confidence: 99%

Investigation of the structure of light exotic nuclei by proton elastic scattering in inverse kinematics

et al. 2015

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“…First detectors specifically dedicated to nuclear physics have been developed in that sense [45,46]. Two TPCs (Time Projection Chambers) have been developed in the 80s-90s with a specific design for reaction studies with stable beams: the IKAR chamber [47,48] and the MSTPC (Multi Sample Tracking Proportional Chamber) [49]. In the following, we present recent developments for active targets dedicated to inverse kinematics reaction with exotic beams.…”

Section: Gaseous Active Targetsmentioning

confidence: 99%

Hydrogen targets for exotic-nuclei studies developed over the past 10 years

Obertelli

Uesaka

2011

Eur. Phys. J. A

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Abstract. Hydrogen-induced reactions provide essential information on nuclear structure, complementary to other experimental probes. For studies at both low and relativistic incident energy, developments in hydrogen targets have been performed over the past 10 years in parallel with the development of new radioactive beams. We present a review of all major hydrogen target developments related to the study of exotic nuclei with direct reactions in inverse kinematics. Both polarized and non-polarized systems are presented.PACS. 2 9.25.Pj

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“…The detection in coincidence of the beam and the reaction products improves the reaction vertex reconstruction and allows a good background rejection. While IKAR is the first example of this type of detector [1], very interesting results have been recently obtained with the active target MAYA [2].…”

Section: Introductionmentioning

confidence: 99%

Electrostatic mask for active targets

et al. 2012

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Active gas targets have been used in nuclear physics since 30 years. They are promising systems in view of the new exotic beams soon available at facilities like SPIRAL2 or FAIR, but the system can still be improved. One of the main limitation is the dynamic range in energy deposition. The energy deposited per unit length can be 3 decades higher for the beam than for the light reaction products and the risk to saturate the electronics or that the detector spark are not negligible. A simple solution using a wire plane to mask partially the beam is presented here. Some simulation has been realized and some experimental results are shown confirming the feasibility of this wire tunable mask. The mask can be used from full transparency to full opacity without degrading neither the drift electric field of the chamber nor the performances of detection of the beam or the light products.

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Experimental apparatus for the study of small angle neutron-proton elastic scattering at intermediate energies

Cited by 19 publications

References 17 publications

Investigation of the structure of light exotic nuclei by proton elastic scattering in inverse kinematics

Investigation of the structure of light exotic nuclei by proton elastic scattering in inverse kinematics

Hydrogen targets for exotic-nuclei studies developed over the past 10 years

Electrostatic mask for active targets

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