Investigation of the nuclear matter distribution of ⁵⁶Ni by elastic proton scattering in inverse kinematics

Abstract

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The Use of Storage Rings in the Study of Reactions at Low-momentum Transfers

“…With this, the procedures for obtaining density parameters were thoroughly checked. The preliminary value of the RMS (folded) matter radius lies in the range of 3.7-3.8 fm with an expected uncertainty of the order of 0.1 fm [18] which is in the range of most theoretical predictions [19,20] while it rules out the lower values predicted by [21].…”

Physics book: CRYRING@ESR

“…Recently a first reaction experiment with a stored radioactive beam was successfully performed at the ESR, where elastic and inelastic proton scattering on 56 Ni was investigated in inverse kinematics (von Schmid et al, 2014;Egelhof et al, 2015;von Schmid et al, 2015). For the energy range accessible at the CRYRING the investigation of one-or few-nucleon transfer reactions is a prominent example.…”

Experimental techniques for in-ring reaction experiments

“…As proof of concept for the innovative vacuum design for the ESPA detection system, based on the differential pumping idea, it was realized inside a dedicated UHV scattering chamber built for the internal gas-jet target section of the ESR. The experiment aimed at (i) commissioning with stable 58 Ni beam on H 2 and 4 He targets [7], (ii) studying 20 Ne at 50 MeV u −1 on H 2 target (experiment E87) [8] and, in particular, (iii) accurately measuring 56 Ni(p, p) 56 Ni at 400 MeV u −1 , as a first nuclear reaction study with radioactive beams in a storage ring [4,9,10]. The measured elastic-scattering cross section provides insight into the radial distribution of nuclear matter and the rms radius of the doubly-magic 56 Ni nucleus.…”

“…The benefit of the slit aperture in front of DSSD1 and Si(Li)s is demonstrated in figure 4, for the relation of the energy of scattered protons with the scattering angle in the 56 Ni(p, p) 56 Ni reaction. In contrast to the situation without slit, inserting the 1 mm wide aperture permits to fully separate elastic scattering from inelastic channels [9,10]. For elastic scattering, there is an analytic relationship between recoil energy and scattering angle.…”