Multiwire proportional chamber for the IUCF cooler ring

Solberg, K.; Eads, A.; Goodwin, J.; Pancella, P. V.; Meyer, H. O.; Rinckel, T.; Ross, A.R.L.

doi:10.1016/0168-9002(89)91326-0

Cited by 9 publications

(2 citation statements)

References 2 publications

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“…A 1.5-mm-thick scintillator (F), segmented into quadrants, is followed by two pairs of orthogonal wire planes, and by a 102-mm-thick (E) and a 6.4-mmthick (V) scintillator, both segmented into octants. The wire chambers have a wire separation of 6.4 mm and are of a special design, 6 which features a central hole for the beam pipe. The wire chambers determine the direction of outgoing charged particles.…”

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Total cross section forp+p→p+p+π0near threshold measured with the Indiana Cooler

et al. 1990

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The total cross section for the reaction pp-*ppn Q was measured at nine center-of-mass energies from 1.5 to 23 MeV above threshold. The experiment was carried out with the Indiana Cooler, a recently constructed storage ring. The experimental advantages of an electron-cooled proton beam were utilized. The data cover an energy range where only the lowest possible angular momentum state contributes in the exit channel. The measured energy dependence of the total cross section is not compatible with that predicted by models of s-wave pion production and rescattering. PACS numbers: 25.10,+s, 13.75.Cs, 21.30.+y, 29.25.Fb Meson-exchange models of the nucleon-nucleon (AW) interaction above the pion threshold rely on detailed information about the strongly coupled inelastic channels which must be treated coherently with the elastic interaction. Information on pion production in the NN system is also required in models of pion production or absorption in nuclei. Customarily, the partial waves in the exit channel of NN-* NNK reactions are labeled by Ll, where L is the angular momentum of the nucleon pair and / is the angular momentum of the pion with respect to the nucleon pair. l Within 100 MeV of threshold, because of the short range of the interaction, only Ss, Sp, Ps, and Pp final states contribute significantly; within 25 MeV the Ss configuration should dominate. In addition, the Sp final state is forbidden in the pp-* ppn° reaction.In the pp-^ppK° reaction, the normally dominant pion production via an intermediate A7V system is suppressed, since the N and the A cannot be in a relative S state. The rescattering contribution is also small because the dominant isovector part of low-energy nN scattering cannot contribute. Thus, near threshold, the pp-*ppn° reaction is dominated by the direct-production Born term. 2 The energy dependence of the cross section is customarily expressed in terms of n, the largest possible center-of-mass pion momentum (with nucleons at rest relative to each other) divided by the pion mass. Based on phase-space arguments, the assumption of r/ o)-This should greatly simplify the theoretical interpretation of the data. The experiment described here is the first to cover this energy range. Previous experiments were hampered by the fact that the cross section (due to the suppressed resonant production) is small and competes with background caused by nuclei other than hydrogen in the path of the beam. Because of the properties of the novel experimental environment described below, it becomes feasible to measure the four-momenta of both outgoing protons, making it possible to comple...

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Total cross section forp+p→p+p+π0near threshold measured with the Indiana Cooler

et al. 1990

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“…It consisted of two scintillator arrays, able to stop 200-MeV protons, and four wire chamber planes. The wire chambers were of a new design and featured a hole in the center (for the stored beam to pass through) bounded by a narrow ring that was supported solely by the wires and thin foils (94). The ce01 detector was capable of measuring the momenta of multiple charged particles, making it possible to reconstruct the kinematics of each recorded event.…”

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The Indiana Cooler: A Retrospective

Meyer

2007

Annu. Rev. Nucl. Part. Sci.

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From 1983 to 2002, the Indiana Cooler was constructed and operated at the Indiana University Cyclotron Facility. During that period, a relatively small group of people built an accelerator complex, explored the new technology of electron cooling, and demonstrated its usefulness in nuclear and particle physics. This review recounts the history of the project, describes the facility, and summarizes the scientific results in atomic, nuclear, and particle physics, and in the physics of beams.

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Non-spin-flip (3He, t) charge-exchange and isobaric analog states of actinide nuclei studied at and 200 MeV

et al. 1991

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The ('He, t) charge-exchange reaction has been studied at 0 = O",and bombarding energies of E('He) = 76.5 MeV and 200 MeV. Spectra were measured using magnetic analysis for target nuclei of 11.13C ) IhO, WF, '8.11Y,30Si, 90Zr, "7.'ZOSn, "ZITa, nalW, 'WAU, ZO8& ?3fk23?Tfl, 234.276.238u and 'JJPu. The measurements at 76.5 MeV concentrated on the isobaric analog states of several actinide nuclei, particularly on their widths and the branching ratios for proton decay. Cross sections, Q-values and total widths were determined for the transitions to the isobaric analog states. Coulomb displacement energies derived from the measured Q-values display the influence of deformed nuclear shapes. Escape widths 1.' and spreading widths r" of the isobaric analog states in five actinide nuclei were deduced from the measured proton-decay branching ratios. They were found to be in agreement with predictions which postulate isospin mixing via the Coulomb force with the ( T,, -1 )-component of the isovector giant monopole resonance. The measurements at 200 MeV were concerned with transitions to isobaric analog states in both light and heavy nuclei, including several actinide nuclei, but Gamow-Teller resonances and transitions to n"mero"s other states were also observed. The measured cross sections for several transitions to isobaric analog states from %i to "'Pb were used to extract the effective interaction V, for non-spin-flip ('He, t) charge exchange at E(3He) = 200 MeV. Theinteraction strength V, decreases by a factor 0.6 when compared to previously measured values for the energy range E(-'He) = 65 to 90 MeV. An angular distribution from 0, =O" to 16' for the transition to the isobaric analog state in '>"Sb measured at E(jHe) = 200 MeV was found to be in very good agreement with microscopic calculations.

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Multiwire proportional chamber for the IUCF cooler ring

Cited by 9 publications

References 2 publications

Total cross section forp+p→p+p+π0near threshold measured with the Indiana Cooler

Total cross section forp+p→p+p+π0near threshold measured with the Indiana Cooler

The Indiana Cooler: A Retrospective

Non-spin-flip (3He, t) charge-exchange and isobaric analog states of actinide nuclei studied at and 200 MeV

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