Resonant state in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mrow /><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msubsup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>

Kahana, D. E.; Kahana, S.; Millener, D.J.

doi:10.1103/physrevc.68.037302

Cited by 13 publications

(22 citation statements)

References 28 publications

(21 reference statements)

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“…Then, it could be appropriate to treat the four-and five-body nature of these NMWD explicitly, as was done for instance in the evaluation of separation energies in single and double strange hypernuclei [40][41][42][43][44][45], and in ab initio calculations of four-nucleon scattering [46]. (The shell model yields quite nice results for light S = −1, −2 hypernuclei [47,48].) It would be very interesting to analyze whether it is possible to account for the experimental nn coincidence spectra through such microscopic calculations.…”

Section: Final Remarksmentioning

confidence: 99%

Nonmesonic Weak Decay Spectra of Light Hypernuclei

Krmpotić

2014

Few-Body Syst

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The nonmesonic weak decay spectra of light hypernuclei have been evaluated in a systematic way. As theoretical framework we adopt the independent particle shell model with three different one-meson-exchange transition potentials. Good agreement with data is obtained for proton and neutron kinetic energy spectra of 4 Λ He, and 5 Λ He, when the recoil effect is considered. The coincidence spectra of proton-neutron pairs are also accounted for quite reasonably, but it was not possible to reproduce the data for the neutron-neutron pair spectra. It is suggested that the π + K meson-exchange model with soft monopole form factors could be a good starting point for describing the dynamics responsible for the decays of these two hypernuclei. The 4 Λ H spectra are also presented.

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Section: Final Remarksmentioning

confidence: 99%

Nonmesonic Weak Decay Spectra of Light Hypernuclei

Krmpotić

2014

Few-Body Syst

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“…Both recent experimental and theoretical studies of doubly strange (S ÿ2) s-shell hypernuclei ( 4 H, 5 H, 5 He, and 6 He) are of utmost interest in the field of hypernuclei [1][2][3][4][5][6][7][8][9][10][11]. An experimental report [1] on a new observation of 6 He has had a significant impact on strangeness nuclear physics.…”

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confidence: 99%

“…An experimental report [1] on a new observation of 6 He has had a significant impact on strangeness nuclear physics. The Nagara event provides unambiguous identification of 6 He production, and suggests that the interaction strength is rather weaker than that expected from an older experiment [12].…”

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confidence: 99%

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Fully Coupled Channel Approach to Doubly Stranges-Shell Hypernuclei

et al. 2005

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We describe ab initio calculations of doubly strange, S = -2, s-shell hypernuclei (4(LambdaLambda)H, 5LambdaLambda)H, 5(LambdaLambda)He, and 6(LambdaLambda)He) as a first attempt to explore the few-body problem of the full-coupled channel scheme for these systems. The wave function includes LambdaLambda, LambdaSigma, NXi, and SigmaSigma channels. Minnesota NN, D2' YN, and simulated YY potentials based on the Nijmegen hard-core model are used. Bound-state solutions of these systems are obtained. We find that a set of phenomenological B8B8 interactions among the octet baryons in S = 0,-1, and -2 sectors, which is consistent with all of the available experimental binding energies of S = 0,-1, and -2 s-shell (hyper)nuclei, can predict a particle stable bound state of 4(LambdaLambda)H. For 5(LambdaLambda)H and 5(LambdaLambda)He, LambdaN-SigmaN and XiN-LambdaSigma potentials significantly affect the net LambdaLambda-NXi coupling, and a large Xi probability is obtained even for a weaker LambdaLambda-NXi potential.

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“…53), 56)-60) Further experimental work is needed to decide whether or not the events reported in the AGS experiment E906 22) correspond to 4 ΛΛ H, particularly in view of subsequent conflicting theoretical analyses of this experiment. 61), 62) 4.3. 10 ΛΛ Be For heavier ΛΛ hypernuclei, the relationship between the three-body and fourbody models is opposite to that found by Filikhin and Gal for 4 ΛΛ H: the ΛΛC 1 C 2 calculation provides higher binding than a properly defined ΛΛC calculation yields (with C = C 1 + C 2 ) due to the attraction induced by the ΛC 1 -ΛC 2 , ΛΛC 1 -C 2 , C 1 -ΛΛC 2 four-body rearrangement channels that include bound states for which there is no room in the three-body ΛΛC model.…”

Section: λλ H I Start By Discussing the First Faddeev-yakubovsky Fourmentioning

confidence: 98%

Fifty Years of Hypernuclei and Beyond

Gal

2004

Prog. Theor. Phys. Suppl.

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On this occasion of marking 50 years to the inception of hypernuclear physics, a brief overview of strangeness nuclear physics is given, focussing on the recent determination of spin-dependent effects in Λ hypernuclei, on the recently established repulsive nature of the Σ nuclear potential and particularly on new developments in double-strangeness physics. Special emphasis is placed on the extrapolation to strange hadronic matter. §1. Introduction and summaryThe properties of hypernuclei reflect the nature of the underlying baryon-baryon interactions and, thus, can provide rather stringent tests of models for the freespace hyperon-nucleon (Y N) and hyperon-hyperon (Y Y ) interactions. Over the years, the Nijmegen group has constructed a number of one-boson-exchange (OBE) models for the baryon-baryon interaction (NN , ΛN − ΣN , and ΞN − ΛΛ − ΣΣ − ΛΣ) using SU(3) f symmetry to relate baryon-baryon-meson coupling constants and phenomenological hard or soft cores at short distances (for a recent review, see Ref . 1)). In addition, the Jülich group has constructed meson-exchange models for the Y N interaction along the lines of the Bonn Model for the NN interaction using SU(6) symmetry to relate coupling constants and short-range form factors. 2) Baryon-baryon SU(6) quark model interactions have also been used within a unified framework of a (3q) − (3q) resonating group method, augmented by a few effective meson exchange potentials of scalar and pseudoscalar meson nonets directly coupled to quarks (see Ref.3), and references therein).To test these models against the considerable body of information on Λ hypernuclei, effective interactions appropriate for use in limited spaces of shell-model orbits must be calculated. This has been done by calculating nuclear-matter G-matrices 4) for the coupled ΛN and ΣN channels. For most models, the resulting Λ well depth is in reasonable agreement with the empirical value 28 MeV deduced from fitting the binding energies of Λ single-particle states 5), 6) observed via the (π + , K + ) reaction at BNL 7) and KEK, 8) but the partial-wave contributions vary widely for the different models. In fact, the spin-dependence of the central interaction varies considerably in the different models. 4) While empirical ΛN effective interactions fitted to the properties of light Λ hypernuclei are more attractive in the singlet than the triplet state, 9), 10) a conclusive choice between the models cannot be made since the effective ΛN N interaction resulting from ΛN − ΣN coupling, which contributes strongly to the spin-dependence for A = 4, 11) has yet to be evaluated in a consistent way. Nevertheless, the spin dependence of the effective ΛN interaction can be extracted by observing excited states in light Λ hypernuclei, as proposed long ago by Dalitz and Gal. 12) This program has been accomplished experimentally in a beautiful set of γ-ray measurements in BNL and KEK, as reported in this meeting by Tamura.

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Resonant state inΛ4He

Cited by 13 publications

References 28 publications

Nonmesonic Weak Decay Spectra of Light Hypernuclei

Nonmesonic Weak Decay Spectra of Light Hypernuclei

Fully Coupled Channel Approach to Doubly Stranges-Shell Hypernuclei

Fifty Years of Hypernuclei and Beyond

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