Experimental Progress in Hypernuclear Physics

Nagae, T.

doi:10.1143/ptps.185.299

Cited by 29 publications

(24 citation statements)

References 19 publications

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“…38)- 40) The typical examples of the calculated strength functions are shown in Fig. 2 for 12 C(π + , K + ) 12 Λ C and comparison of the angular distributions in Fig. 3, respectively.…”

Section: Use Of the Elementary Amplitudes Having Spin-flip And Spin-nmentioning

confidence: 99%

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(π⁺,K⁺) Reaction Spectroscopy of Heavy Hypernuclei

Motoba

Itonaga

Yamamoto

2010

Prog. Theor. Phys. Suppl.

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For the last few decades the (π + , K + ) reaction has played an important role in heavy hypernuclear spectroscopy where the Λ spin-orbit splitting should be one of the most interesting subjects. In this article, first, various stages of calculational frameworks for hypernuclear production cross sections are discussed. Then, focusing on the 89 Y(π + , K + ) 89 Λ Y experimental data, new DWIA analysis has been carried out by taking full account of the core nuclear excitation effects. As a result we found that one of the doublet peaks comes from the nuclear core excitation and that the Λ spin-orbit splitting is small in consistent with the finding in the p-shell hypernuclei. §1. IntroductionFor the last few decades the (π + , K + ) reaction has played a special role in hypernuclear reaction spectroscopy. It excites Λ-particle, neutron-hole states of stretched angular momentum quite selectively, so that it has revealed a series of almost all the bound Λ single-particle states inside some nuclei. The reaction mechanism and the theoretical demonstrations were discussed first by Dover et al. 1) and by Bandō and one of the present authors (T.M.). 2) In fact, the first (π + , K + ) experiment on a 12 C target, carried out at Brookhaven National Laboratory, showed promising results. 3) Sophisticated calculations using the Kapur-Peierls framework were performed in order to include quasi-free continuum strengths in addition to the wellseparated bound-state peaks. 4) On the experimental side, the BNL group extended the (π + , K + ) studies up to medium-mass systems with A 28 − 89, 6), 7) while at KEK better energy resolution was ¡achieved using the SKS spectrometer up to a heaviest target of 208 Pb. 8)-11) See Ref. 13) for review of the (π + , K + ) experiments.One of the purposes of the (π + , K + ) experiments on heavy nuclear targets was to extract the Λ spin-orbit splittings over a wide range of hypernuclear species. 4), 5) The 89 Y(π + , K + ) 89 Λ Y experiment 11) among others provides us with the most typical spectrum with good energy resolution (1.65 MeV) in which four (five) well-separated major peaks are understood to correspond basically to the s Λ , p Λ , d Λ , and f Λ (g Λ ) orbits. In addition, according to the experimental analysis, each peak (labeled p Λ , d Λ , f Λ in Fig. 5 of Ref. 11)) consists of two subpeaks, which are denoted as (1L,1R), (2L,2R), and (3L,3R), respectively. 11) If this double-peak structure is attributed to the spin-orbit partners, the splittings are ΔE exp 1 = 1.37 MeV (p Λ ), ΔE exp 2 = 1.63 MeV (d Λ ), and ΔE exp 3 = 1.70 MeV (f Λ ), respectively, 11) but, as shown later, these values are two or three times larger than the spin-orbit splittings estimated using the

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“…38)- 40) The typical examples of the calculated strength functions are shown in Fig. 2 for 12 C(π + , K + ) 12 Λ C and comparison of the angular distributions in Fig. 3, respectively.…”

Section: Use Of the Elementary Amplitudes Having Spin-flip And Spin-nmentioning

confidence: 99%

“…Strength functions (top) and polarization (bottom) calculated in KPM for the 12 C(π + , K + )12 Λ C reaction at p π = 1.04 GeV/c and θ K = 5 deg.…”

mentioning

confidence: 99%

(π⁺,K⁺) Reaction Spectroscopy of Heavy Hypernuclei

Motoba

Itonaga

Yamamoto

2010

Prog. Theor. Phys. Suppl.

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“…[2][3][4] for recent reviews. Due to the additional strangeness degree of freedom, a hyperon is free from nucleon's Pauli exclusion principle.…”

Section: Introductionmentioning

confidence: 99%

Quadrupole deformation(β,γ)of lightΛhypernuclei in a constrained relativistic mean field model: Shape evolution and shape polarization effect of the
Lü
¹
,
Zhao
²
,
Zhou
³

2011
Phys. Rev. C

117

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Quadrupole deformation (β, γ) of light Λ hypernuclei in constrained relativistic mean field model: shape evolution and shape polarization effect of Λ hyperon The shapes of light normal nuclei and Λ hypernuclei are investigated in the (β, γ) deformation plane by using a newly developed constrained relativistic mean field (RMF) model. As examples, the results of some C, Mg, and Si nuclei are presented and discussed in details. We found that for normal nuclei the present RMF calculations and previous Skyrme-Hartree-Fock models predict similar trends of the shape evolution with the neutron number increasing. But some quantitative aspects from these two approaches, such as the depth of the minimum and the softness in the γ direction, differ a lot for several nuclei. For Λ hypernuclei, in most cases, the addition of a Λ hyperon alters slightly the location of the ground state minimum towards the direction of smaller β and softer γ in the potential energy surface E ∼ (β, γ). There are three exceptions, namely, 13 Λ C, 23 Λ C, and 31 Λ Si in which the polarization effect of the additional Λ is so strong that the shapes of these three hypernuclei are drastically different from their corresponding core nuclei.

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“…The Fabre optimal subset [28], [29] is adopted to obtain fast and good convergence for the calculated binding energy using the renormalized Numerov method. [35], [36].The obtained results are then compared with those obtained using other methods of calculations as well as the recent experimental one reported by Nagara event [9], [21]. We employ the hyperspherical harmonics expansion (HH) method to solve such a three-body system.…”

Section: Introductionmentioning

confidence: 97%

Hyperspherical Three Body Calculations For The Exotic  6 He Hypernucleus

Allam¹

2012

IOSRJAP

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Experimental Progress in Hypernuclear Physics

Cited by 29 publications

References 19 publications

(π⁺,K⁺) Reaction Spectroscopy of Heavy Hypernuclei

(π⁺,K⁺) Reaction Spectroscopy of Heavy Hypernuclei

Quadrupole deformation(β,γ)of lightΛhypernuclei in a constrained relativistic mean field model: Shape evolution and shape polarization effect of the
Lü
¹
,
Zhao
²
,
Zhou
³

2011
Phys. Rev. C

Hyperspherical Three Body Calculations For The Exotic  6 He Hypernucleus

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Experimental Progress in Hypernuclear Physics

Cited by 29 publications

References 19 publications

(π+,K+) Reaction Spectroscopy of Heavy Hypernuclei

(π+,K+) Reaction Spectroscopy of Heavy Hypernuclei

Quadrupole deformation(β,γ)of lightΛhypernuclei in a constrained relativistic mean field model: Shape evolution and shape polarization effect of theLü1, Zhao2, Zhou3 2011Phys. Rev. C

Hyperspherical Three Body Calculations For The Exotic  6 He Hypernucleus

Contact Info

Product

Resources

About

(π⁺,K⁺) Reaction Spectroscopy of Heavy Hypernuclei

(π⁺,K⁺) Reaction Spectroscopy of Heavy Hypernuclei

Quadrupole deformation(β,γ)of lightΛhypernuclei in a constrained relativistic mean field model: Shape evolution and shape polarization effect of the
Lü
¹
,
Zhao
²
,
Zhou
³

2011
Phys. Rev. C