The α∗ and the neutron scattering lengths of 3He

Baumgartner, M.; Gubler, H.P.; Heller, M.; Plattner, G.R.; Roser, Werner; Sick, I.

doi:10.1016/0375-9474(81)90681-3

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…In this way the analysis of the shape of the experimental angular distribution can also signal the presence of non-monopole contributions in the 20.4 MeV resonance region. The extraction of the position and width of the 0 + resonance with better accuracy with respect to the previous ( 4 He, 4 He) measurements [161], [162] is also planned, to hopefully shed light on the disagreement with the extractions from (e,e') data [163]. Precise data will be useful to the ab-initio theory community, in view of a better understanding and constraining of the nuclear Hamiltonians.…”

Section: The Isoscalar Monopole Resonance Of the Alpha Particlementioning

confidence: 99%

The MAGNEX spectrometer: Results and perspectives

et al. 2016

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This article discusses the main achievements and future perspectives of the MAGNEX spectrometer at the INFN-LNS laboratory in Catania (Italy). MAGNEX is a large acceptance magnetic spectrometer for the detection of the ions emitted in nuclear collisions below Fermi energy. In the first part of the paper an overview of the MAGNEX features is presented. The successful application to the precise reconstruction of the momentum vector, to the identification of the ion masses and to the determination of the transport efficiency is demonstrated by in-beam tests. In the second part, an overview of the most relevant scientific achievements is given. Results from nuclear elastic and inelastic scattering as well as from transfer and charge exchange reactions in a wide range of masses of the colliding systems and incident energies are shown. The role of MAGNEX in solving old and new puzzles in nuclear structure and direct reaction mechanisms is emphasized. One example is the recently observed signature of the long searched Giant Pairing Vibration. Finally, the new challenging opportunities to use MAGNEX for future experiments are briefly reported. In particular, the use of double charge exchange reactions toward the determination of the nuclear matrix elements entering in the expression of the half-life of neutrinoless double beta decay is discussed. The new NUMEN project of INFN, aiming at these investigations, is introduced. The challenges connected to the major technical upgrade required by the project in order to investigate rare processes under high fluxes of detected heavy ions are outlined. Magnetic spectrometers in Nuclear Reaction studies .

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Section: The Isoscalar Monopole Resonance Of the Alpha Particlementioning

confidence: 99%

The MAGNEX spectrometer: Results and perspectives

et al. 2016

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“…In a previous experiment we also used the neutron interferometer for a precise measurement of the coherent scattering length for the neutron-He-3 system (a,. Including other low energy interaction parameters smaller error bars are obtained within the framework of theoretical model calculations [12]. A high accuracy was obtained even though the high absorption cross section of He-3 (a,=5327b) limits the amount of He-3 that can be inserted into the neutron beam.…”

Section: Introductionmentioning

confidence: 85%

“…ai=3.55_+0.38 fm [10]). Separable potentials of the central exchange type are used for the nucleon-nucleon interaction to get numerical values for the low energy interaction parameters of the four-nucleon system [7,[18][19][20][21] and even modified two-body calculations [12,23] yield reasonable estimates due to the repulsive character of the neutron-triton interaction. The large imaginary component of the singlet interaction, the Coulomb contribution and the mixture of various isospin states complicates quantitative predictions for these quantities by microscopic four nucleon calculations.…”

Section: Introductionmentioning

confidence: 99%

Measurements of the coherent neutron-tritium scattering length and its relation to the four nucleon problem

Hammerschmied

Rauch

Clerc³

et al. 1981

Z Physik A

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Using a neutron interferometer the bound coherent neutron-tritium scattering length was determined to b,. = 5.10 _+ 0.10 fm. This yields a free scattering length of ac=3.82 _+0.07fm. Together with the recently measured free cross section (c% =1.70 _+ 0.03 b [5, 6]) new recommended values for the singlet and triplet scattering lengths are obtained (a~=3.70+0.62 fm, at=3.70+_0.21 fm). These values are compared with theoretical estimates based on recent calculations for the four nucleon systems.

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“…Regarding the 4 He level scheme, it should be mentioned that no bound states are present [1] however, a pronounced resonance with the same spin and parity (0 + ) as the ground state exists with a centroid slightly above the proton emission energy threshold (S(p)= 19.813 MeV). Although several works have been devoted to the study of the 0 + first excited state of 4 He by using (e,e') [2,3,4,5] or ( 4 He, 4 He) probes [6,7], many of its properties remain unclear. In more details, different values for the resonance centroid and width are met in the literature.…”

Section: Introductionmentioning

confidence: 99%

Revisiting the ⁴He(⁴He,⁴He)⁴He* inelastic scattering at the MAGNEX facility

Soukeras,

Cappuzzello,

Agodi

et al. 2023

J. Phys.: Conf. Ser.

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The 4He(4He,4He)4He* inelastic scattering was investigated at the MAGNEX facility of INFN - LNS, aiming at shedding light on the characteristics of the isoscalar monopole resonance of 4He which lies at an energy slightly higher than the proton emission threshold and slightly lower than the neutron emission threshold. A complementary elastic scattering measurement was also performed to study the initial state interaction and set accurate coupled channel calculations. Here, the experimental setup, the data reduction and the theoretical interpretation strategy are briefly described.

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The α∗ and the neutron scattering lengths of 3He

Cited by 8 publications

References 23 publications

The MAGNEX spectrometer: Results and perspectives

The MAGNEX spectrometer: Results and perspectives

Measurements of the coherent neutron-tritium scattering length and its relation to the four nucleon problem

Revisiting the ⁴He(⁴He,⁴He)⁴He* inelastic scattering at the MAGNEX facility

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The α∗ and the neutron scattering lengths of 3He

Cited by 8 publications

References 23 publications

The MAGNEX spectrometer: Results and perspectives

The MAGNEX spectrometer: Results and perspectives

Measurements of the coherent neutron-tritium scattering length and its relation to the four nucleon problem

Revisiting the 4He(4He,4He)4He* inelastic scattering at the MAGNEX facility

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Revisiting the ⁴He(⁴He,⁴He)⁴He* inelastic scattering at the MAGNEX facility