Potential description of the positive- and negative-energy properties of the α<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo><mml:mi mathvariant="normal" /></mml:mrow><mml:mrow><mml:mn>40</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Ca system and<i>α</i>-cluster structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ti</mml:mi><

Michel, F. C.; Reidemeister, Guy; Ohkubo, S.

doi:10.1103/physrevc.37.292

Cited by 67 publications

(61 citation statements)

References 61 publications

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“…For 46 Cr a clear increase of λ is found for L > 6. A similarly increasing λ for large L was also found for α-cluster states in 44 Ti [18]. The L dependence of λ can be fitted by a parabola…”

Section: Resultsmentioning

confidence: 99%

“…212 Po = 208 Pb ⊗ α, 44 [3,4,5,6,7,8,9,10]. Very recently, Souza and Miyake [1] (hereafter: S&M) have extended these studies towards the chromium isotopes.…”

Section: Introductionmentioning

confidence: 99%

“…First, the calculations of α-cluster states in 44 Ti of our previous work [18] were repeated using the theoretical density of 40 Ca from TALYS instead of an experimental density, and only tiny deviations to the results in Tables II and III of [18] were found. Second, folding potentials were calculated for 50 Ti-α using either the theoretical density from TALYS or a matter density derived from the experimental charge density [30].…”

Section: Folding Potential Modelmentioning

confidence: 99%

“…Their subsequent study finds that 46 Cr has a significant degree of α-clustering, whereas the reduced α widths in 54 Cr are about a factor of three lower. Interestingly, earlier studies above 44 Ti have focused on 48 Cr which is considered as a 40 Ca core plus two α particles [11,12].…”

Section: Introductionmentioning

confidence: 99%

“…A detailed 16 O ⊗ α is given in [14] which was later extended to (α,γ) capture reactions [15,16,17]. 44 Ti = 40 Ca ⊗ α and 40 Ca(α,α) 40 Ca elastic scattering was studied in [18], and the mass region around A ≈ 40 was also reviewed in detail in [6].…”

Section: Introductionmentioning

confidence: 99%

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$ \alpha$ α -cluster states in 46,54Cr from double-folding potentials

Mohr

2017

Eur. Phys. J. A

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Section: Resultsmentioning

confidence: 99%

“…212 Po = 208 Pb ⊗ α, 44 [3,4,5,6,7,8,9,10]. Very recently, Souza and Miyake [1] (hereafter: S&M) have extended these studies towards the chromium isotopes.…”

Section: Introductionmentioning

confidence: 99%

Section: Folding Potential Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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$ \alpha$ α -cluster states in 46,54Cr from double-folding potentials

Mohr

2017

Eur. Phys. J. A

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Weak coupling in the upper part of the sd-shell and α-clustering in 38Ar

Miyamoto

Ohkubo

1995

Atomic and Nuclear Clusters

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Abstract.It is suggested that weak coupling picture for the e-cluster states holds not only in the 44Ti~4~ region but also in the upper part of the sd-shell region. To confirm this experimentally, the e-clustering aspects of 3BAr is investigated. 25.55.Ci; 21.60.Gx; 27.30. +t Alpha-cluster picture has been successful in light nuclei up to 2~ in the sd-shell region. Recent observations [1] of a theoretically predicted parity doublet K=0-band [-2] with an e-cluster structure both in 44Ti and 4~ have shown that the e-cluster structure is important even in the fp-shell region. However, e-clustering aspects in the upper part of the s d-shell remain unclear. In this communication we suggest that the weak coupling picture for e-cluster states holds not only in the beginning of the fp-shell region of 44Ti ~ 4~ but also across the shell closure. To confirm this, attention is drawn to the importance of the observation of a welldeveloped e-cluster K = 0-band in 3BAr. PACS:The e-hole (in the d3/2 orbit) interaction in thefp-shell region estimated by using the experimental binding energies [4] is repulsive and weak at about 0.48 MeV, which supports weak coupling in the region. However, we see in Fig. 1 that weak coupling of the energy levels seems to hold not only in the beginning of the fp-shell but also in the upper part of the sd-shell across the shell closure. In 3SAr not only does the rotational K=0 + band built on the first excited 0 § state [5] resemble that in 4~ 42Ca and 44Ti but also the B(E2) values between the states of the band are similarly very much enhanced. This K=0 § band can be considered to be a 4p-6h intruder state, while in 36Ar the 0~, wich is enhanced in the e-transfer reactions I-6], can be considered to be a 4p-8 h intruder state.One of the direct ways to confirm that weak coupling based on the e-cluster picture persists across the shell closure is to observe the e-cluster K=0-band in 3SAt which is a parity-doublet partner of the K=0 § band. To know how the band is enhanced in the e-transfer reactions in spite of the fragmentation [1], e-widths as well as location of the energy levels are needed.e-particle scattering from nuclei in this region does not show a pronounced backward angle anomaly (BAA) which is typically seen in e-scattering from 4~ because of increased absorption. This is one of the reasons why little attention has been paid to studies of e-clustering in this region. However, we notice that angular distributions at backward angles still retain a characteristic feature peculiar to the BAA. For the e+34S system the angular distribution of e-particle scattering at E. = 18 MeV [7] shows a characteristic feature at backward angles more or less similar to e+ 36Ar scattering.

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