The giant dipole resonance in light nuclei and related phenomena

Eramzhyan, R.A.; Ishkhanov, B. S.; Капитонов, И.М.; Neudatchin, V. G.

doi:10.1016/0370-1573(86)90136-5

Cited by 85 publications

(44 citation statements)

References 317 publications

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“…The interpretation of MR complicated structure and its dependence on the individual properties of nuclei is one of the aims of nuclear theory. The giant dipole resonance E1 is up to now the best explored among the multipole resonances [1]. The efforts to explain the origin of its position on energy axis promote the creation of multiparticle shell model (MSM).…”

Section: Description Of Multipole Resonancesmentioning

confidence: 99%

Origins of dipole resonance strength fragmentation in calcium and titanium isotopes

Goncharova

Skorodumina

2012

EPJ Web of Conferences

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Abstract. Theoretical description of dipole resonances in 46 Ti, 48 Ti, 50 Ti, 48 Ca, 40 Ca was performed. The distribution of the "hole" among the states of final nuclei was taken into account using information on pick-up reactions. The obtained results are in reasonable agreement with experimental data. Description of multipole resonancesThe giant multipole resonances (MR) represent the most striking feature of the reactions cross sections up to energy excitation E<40 MeV and transferred momentum q< 3 fm -1 . The interpretation of MR complicated structure and its dependence on the individual properties of nuclei is one of the aims of nuclear theory. The giant dipole resonance E1 is up to now the best explored among the multipole resonances [1]. The efforts to explain the origin of its position on energy axis promote the creation of multiparticle shell model (MSM). The success of MSM in interpretation of dipole resonance as a result of collectivization of so-called "doorway states" could not eliminate all problems in its theoretical description. One of them is the need to explain the great differences in widths and structures of the distributions of E1 strength in various nuclei. The growth of information on structure of giant resonances has shown that the MSM calculations based on particle-hole configurations are unable to reproduce complicated structure of MR. The usual way to overcome this problem is to expand the basic space and to take into account the interaction of "doorway" states with more complicated configurations, first of all with collective phonons. Applications of this method to the resonances in the middle and heavy closed-shell nuclei were rather successful, but the interpretation of structure and decay properties of MR in open shell nuclei represents a challenge to the theory. Moreover, due to pairing forces the "magic" nuclei are not bona fide completely closed-shell systems. Particle-core coupling version of Shell ModelOne of the possible ways to build a set of basic configurations which could be used as doorway states in the microscopic description of multipole resonances in open shell nuclei is to take into account the distribution of the "hole" configurations among the states of residual (A-1) nuclei.In the "Particle Core Coupling version of Shell Model" (PCC SM) these distributions are taken into account in microscopic description of multipole resonances [2,3]. Theoretical description of MR in 1p-shell nuclei in the PCC SM has shown good agreement with experimental data for nuclei with A from 7 up to 15 [3]. The same approach to sd-shell nuclei strikes against the lack of reliable wave functions for the nuclear ground states. The alternative way to estimate the probabilities of the various core states which appears when one of the nucleons would be extracted from nucleus is to use the experimental data on the spectroscopy of direct pick-up reactions .This method was applied to calculations of multipole resonances in sd-shell nuclei [4]. Wave functions of excited nuclear states in th...

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Section: Description Of Multipole Resonancesmentioning

confidence: 99%

Origins of dipole resonance strength fragmentation in calcium and titanium isotopes

Goncharova

Skorodumina

2012

EPJ Web of Conferences

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“…For 1p-shell hypernuclei SAS do belong to the nominally "1hω" excitation band splitted into three groups, because the single-particle energies differ significantly, as can be seen in Table 3. The situation reminds "configurational splitting" of Giant Dipole Resonance [43]. …”

Section: Modelmentioning

confidence: 88%

Hyperfragments from lightest p-shell hypernuclei

Majlingová¹,

Majling²

2013

Proceedings of XXI International Baldin Seminar on High Energy Physics Problems — PoS(Baldin ISHEPP XXI)

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In this contribution, we discuss the potential of Λ-hypernuclear physics. A short overview of current experiments is given and the essential features of Λ hypernuclei are briefly mentioned. The observation of the heavy hyper Hydrogen 6 Λ H revived interest in identification of hyperfragments -products of the strong decay of a primary hypernuclei. The registration of hypernuclei 6 Λ H and 8 Λ H was already put on the list of tasks for Nuclotron. Theoretical background is pointed out and experimental possibilities are compared with other experiment. Our contribution is inspired by the possibility to identify hyperfragments in the reaction (e, e K + ). In the near future two experiments: at JLab and at Mainz will provide a systematic study of the fragments from the primary p-shell hypernuclei. It is an important extension of the very successful experiments investigated discrete part of hypernuclear spectra. We present an approach to identification hyperfragments from p-shell hypernuclei. As a first step we analyze the decay of the components of Strange Analogue States (p Λ p −1 , s Λ s −1 ) for hypernuclei A ≤ 9 using Translation Invariant Shell Model (TISM). The attention is focused on the nuclear structure role of concrete decay channels population. Some predictions are given.

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“…We have noted similarity of hypernuclear spectra with Giant Dipole Resonance [17], namely its "configurational splitting" [18], when nominally 1 ω states are splitted into three groups, because single-particle energies differ significantly, as can be seen in Table 1. …”

Section: Baryonic Decaymentioning

confidence: 99%

“…The concept of configurational splitting comprises two effects [18,20]: (i) the energy gap between the groups of transitions corresponding to valence (1p → 2d, s) and core nucleon excitation (0s → 1p), and EPJ Web of Conferences (ii) the predominance of clustering phenomena in the lightest nuclei (related to Wigner supermultiplet symmetry).…”

Section: Baryonic Decaymentioning

confidence: 99%

Translational invariant shell model for Λ hypernuclei

Jolos¹,

Majling²,

Majlingová

2016

EPJ Web of Conferences

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Abstract. We extend shell model for Λ hypernuclei suggested by Gal and Millener by including 2 ω excitations in the translation invariant version to estimate yields of different hyperfragments from primary p-shell hypernuclei. We are inspired by the first successful experiment done at MAMI which opens way to study baryon decay of hypernuclei. We use quantum numbers of group SU(4), [ f ], and SU(3), (λμ), to classify basis wave functions and calculate coefficients of fractional parentage.

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The giant dipole resonance in light nuclei and related phenomena

Cited by 85 publications

References 317 publications

Origins of dipole resonance strength fragmentation in calcium and titanium isotopes

Origins of dipole resonance strength fragmentation in calcium and titanium isotopes

Hyperfragments from lightest p-shell hypernuclei

Translational invariant shell model for Λ hypernuclei

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