Isomeric states in Λ7He

Dalitz, R.H.; Gal, A.

doi:10.1016/0550-3213(67)90148-4

Cited by 28 publications

(10 citation statements)

References 11 publications

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“…4 top) and the binding energy was not obtained [6]. It was hypothesized that the cluster corresponded to the ground state and that the broad tail originated from the decay of isomeric states of 7 Λ He but this was not experimentally confirmed [7][8][9]. The E01-011 data are consistent with the interpretation that the cluster of emulsion data corresponds to the ground state.…”

Section: Fig 2 Missing Mass Spectrum Of the P(e Esupporting

confidence: 79%

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Observation of theHeΛ7Hypernucleus by the (e,e′K+
Nakamura¹,
Matsumura²,
Okayasu³
et al. 2013
Phys. Rev. Lett.
82
1
45
0
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Section: Fig 2 Missing Mass Spectrum Of the P(e Esupporting

confidence: 79%

“…We report here the first clear observation of the ground state of [6], only a total of 11 events are known; furthermore, the measured masses for these events are spread out widely, which lead to speculation that long lived isomeric states [7][8][9] were observed together with the ground state. Therefore, no ground state mass has been quoted in the literature.…”

mentioning

confidence: 99%

Observation of theHeΛ7Hypernucleus by the (e,e′K+
Nakamura¹,
Matsumura²,
Okayasu³
et al. 2013
Phys. Rev. Lett.
82
1
45
0
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“…The momentum values of 3 He, 4 He and 6 He are concentrated in the ≈ 14 GeV/c, ≈ 19 GeV/c and We repeat once again advantages of Dubna setup presented at Baldin seminar six years ago [31]: • unique identification of 6 Λ H see Fig. 2; • possibility to measure lifetime of 6 Λ H and to verify the existence of long-lived isomeric state in neutron-rich hypernuclei [32]; • possibility to identify even extremely exotic hypernucleus 8 Λ H (= p + Λ+ 6 n) -the chart of hypernuclei (Fig. 1) suggests that Λ might bind 7 H [33].…”

Section: Pos(baldin Ishepp Xxi)101mentioning

confidence: 99%

“…The lower state has symmetry [41] for its nuclear core, so its break-up to 5 Λ He+p or to 5 Li+Λ is allowed both energetically and by supermultiplet symmetry. The upper (narrow) state has symmetry [ f ] = [32] for its nuclear core, so that its decay to 5 Li +Λ or 5 Λ He+p, is forbidden by the selection rules for the supermultiplet symmetry. Another example of the important role s −1 s Λ states play are γ-ray transitions in hyperfragments.…”

Section: Approachmentioning

confidence: 99%

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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“…13 Let us consider in some detail the case A = 9. Be 8 (the core of A Be 9 ) nas predominantly the maximum orbital symmetry, [4], in its ground state, 14 while Li 8 (the core of A Li9 )> because of the Pauli principle, cannot have more spatial symmetry than the [3, 1] type. The interaction (3) is capable therefore of lowering the binding energy of \Be 9 relative to that of A Li 9 .…”

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confidence: 99%

Evidence forΛNNRepulsive Forces fromp-Shell Hypernuclei

Gal

1967

Phys. Rev. Lett.

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is taken from V. Barger and D. Cline, Phys. Rev. Letters 16, 913 (1966); and to be published. The first four resonances are chosen for AL and A^ f and for N a the AT(938), iV*(1688), and a possible f ~ resonance mentioned in Ref. 8 are taken. 8 C. B. Chiu and J. D. Stack, Phys. Rev. 153, 1575 (1967). Our results reproduce their W = 0 intercept of the N a trajectory. 9 The N a and ATy trajectories do not turn around, while AQ turns around at W « 35 BeV and a « 125. Whether or not the trajectories turn around depends on the detailed asymptotic behavior of Ima^. Our results for the polarization in question (where W £ 5 BeV) are insensitive to such details o 10 Since Imc^ is small compared with Rea^, the imaginary part of Xi is ignored. n C. B. Chiu, R. J. N. Phillips, and W. Rarita, Phys. Rev 0 153., 1485 (1967).A binding energies of hypernuclei in the p shell follow a linear trend when plotted against baryon number ,4 ( Fig. 1). The over-all linear increase with A is attributed, in various approaches, 1 ? 2 to the strong spin-independent central part of the AN interaction. For each p -shell nucleon, an average of about 1-to 1.5-MeV binding has been obtained. 2 ? 3 The spindependent components of the AN interaction are expected to produce deviations of about 0.5 MeV 3 > 4 from the straight line shown in Fig. 1.There are some exceptions to this general description of p -shell hypernuclei, notably at A numbers 9 and 13. Both A Be9 and A c * 3 lie considerably below the straight line of Fig. 1. For these two A values surprisingly large binding-energy differences are found 5 " 7 :AB ( A Li 9 -Be 9 ) = 1.62 ± 0.19 MeV, AAA '(1) AAA It is to be noticed that # A ( A C 13 )= 10.9 ±0.3 MeV 7 is even lower thanB A ( A B 12 )= 11.06±0.14 MeV, 5 in spite of the smaller A value of A B 12 . The third example we wish to consider is that of 12 One can use more complicated expressions for X${W) which would, among other things, take account of its threshold properties. However, experimental information on these quantities at low energies is not very good and, consequently, no useful purpose is served in increasing the number of parameters. We have implicitly assumed that, asymptotically, Xf falls off as an exponential. This need not be true in practice.13 This is partly due to the fact that higher partialwave amplitudes carry larger statistical weight.14 The direct-channel contribution is comparable with p only around the dip region, where the p amplitude is ~J-its forward value. However, p is a rather weak secondary trajectory because at £ = 0 it is already ~^j the Pomeranchuk (P) amplitude. Therefore, compared with P the direct channel is quite small and the basic Regge hypothesis of the asymptotic dominance of the leading poles in unhampered.the A = 8 hypernuclei. The "exotic" A He 88 lies considerably above the straight line of Fig. 1. Here we have 5 ? 8 AS (He 8 -Li 8 ) =1.0 ±0.8 MeV,(2) AAA ' which might appear less problematic than in the previous examples (1). However, by coupling the particularly low first excited stat...

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Isomeric states in Λ7He

Cited by 28 publications

References 11 publications

Observation of theHeΛ7Hypernucleus by the (e,e′K+
Nakamura¹,
Matsumura²,
Okayasu³
et al. 2013
Phys. Rev. Lett.
82
1
45
0
View full text Add to dashboard Cite

Observation of theHeΛ7Hypernucleus by the (e,e′K+
Nakamura¹,
Matsumura²,
Okayasu³
et al. 2013
Phys. Rev. Lett.
82
1
45
0
View full text Add to dashboard Cite

Hyperfragments from lightest p-shell hypernuclei

Evidence forΛNNRepulsive Forces fromp-Shell Hypernuclei

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Isomeric states in Λ7He

Cited by 28 publications

References 11 publications

Observation of theHeΛ7Hypernucleus by the (e,e′K+Nakamura1, Matsumura2, Okayasu3 et al. 2013Phys. Rev. Lett.821450View full textAdd to dashboardCite

Observation of theHeΛ7Hypernucleus by the (e,e′K+Nakamura1, Matsumura2, Okayasu3 et al. 2013Phys. Rev. Lett.821450View full textAdd to dashboardCite

Hyperfragments from lightest p-shell hypernuclei

Evidence forΛNNRepulsive Forces fromp-Shell Hypernuclei

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Observation of theHeΛ7Hypernucleus by the (e,e′K+
Nakamura¹,
Matsumura²,
Okayasu³
et al. 2013
Phys. Rev. Lett.
82
1
45
0
View full text Add to dashboard Cite

Observation of theHeΛ7Hypernucleus by the (e,e′K+
Nakamura¹,
Matsumura²,
Okayasu³
et al. 2013
Phys. Rev. Lett.
82
1
45
0
View full text Add to dashboard Cite