Non-normal-parity states in A = 7 and 8 nuclei

Aswad, Ahmad; Kissener, H.R.; Jäger, H.U.; Eramzhian, R.A.

doi:10.1016/0375-9474(73)90735-5

Cited by 16 publications

(4 citation statements)

References 63 publications

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“…Excited states of 8 B higher than 3.5 MeV were not explored in past measurements, and we discovered new resonance at 5.0 MeV and assigned its J π as 1 − . A 1 − resonance in the A=8 nuclei was predicted to emerge in the vicinity of a 2 − state by theoretical studies [34,20,21,22]. In [24], a structure due to 1 − level appeared at E ex = 4.1 MeV (E proton = 4.5 MeV) in the calculated S-factor spectrum.…”

Section: Tablementioning

confidence: 99%

“…The presence of the 2 − state around 3.5 MeV was questionable because of the limited statistics and energy range in previous experiments [17,18], although the 2 − state was also expected to exist from the analysis on the experimental data of mirror nucleus [33,19,20,23,24] and shell model calculations [34,21,22]. We successfully performed measurements with more counting statistics and a wider energy range, and a slowly varying excitation function after the peak around 2.3 MeV was observed, as shown in Fig.…”

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confidence: 97%

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Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

et al. 2009

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A new measurement of proton resonance scattering on 7 Be was performed up to the center-of-mass energy of 6.7 MeV using the low-energy RI beam facility CRIB (CNS Radioactive Ion Beam separator) at the Center for Nuclear Study of the University of Tokyo. The excitation function of 7 Be+p elastic scattering above 3.5 MeV was measured successfully for the first time, providing important information about the resonance structure of the 8 B nucleus. The resonances are related to the reaction rate of 7 Be(p,γ) 8 B, which is the key reaction in solar 8 B neutrino production. Evidence for the presence of two negative parity states is presented. One of them is a 2 − state observed as a broad s-wave resonance, the existence of which had been questionable. Its possible effects on the determination of the astrophysical S-factor of 7 Be(p,γ) 8 B at solar energy are discussed. The other state had not been observed in previous measurements, and its J π was determined as 1 − .

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Section: Tablementioning

confidence: 99%

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confidence: 97%

Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

et al. 2009

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“…The shell model prediction of Aswad et a1 [18] for $ and 2 are at 11.52 and 12.63MeV respectively whilst Knox and Lane [19] estimate $ and 2 at 8.81 and 9.97 MeV respectively. According to measurements by Skopik et a1 [5], there is also evidence for a smaller resonance state observed around E = 18 MeV.…”

Section: Results and Conclusionmentioning

confidence: 87%

“…Combining (18) and the wavefunction ( 7 ) , recoupling the angular momenta and effecting the transformation from one pair of Jaboci coordinates (R4 -R 3 ) , (Rzr ) to another pair (R4 -R 2 ) , (& -r ) , then inserting this together with ( 17) into (3) we finally obtain the expression for the (SA) for the transition from the states s4p2 (2~-ld),…”

Section: S H Al-samurai Et A1mentioning

confidence: 99%

Widths of the positive parity states in⁷Li for the (α+t) channel

Al-Samarai¹,

Al-Hamdani²,

Al-Kateeb³

1990

J. Phys. G: Nucl. Part. Phys.

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Formulae for calculating the spectroscopic amplitudes of the positive parity states in 'Li for the ((U + t) channel are derived. The wavefunctions of the simple harmonic oscillator shell model with an LS-scheme for the initial and final nuclei are used. The formulae are applied for calculating the spectroscopic amplitudes for transitions from the dipole states of 7Li into ((U + t). Transitions to the CY excited states are also included. Widths of the positive parity states for the ((U + t) channel are computed and the results are compared with experimental data.

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Microscopic Studies of Electric Dipole Resonances in 1p Shell Nuclei

1987

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Recent data on total and partial photonuclear cross sections in the GDR region of the nuclei 6Li to 16O are compared with theoretical predictions, mostly from shell model and continum shell model studies. The influence of the size of the configuration space, of the adopted residual interaction and of the continuous spectrum on the isovector E1 response is discussed to some detail. The observed trends of the localization, the shape and width, the isospin and the configurational structure of the GDR with increasing 1p shell occupation are related to the microscopic structure of the nuclear ground state. Particular attention is given to the partial (γ, Ni) disintegration channels. Complex‐particle emission and isospin mixing in the nuclear states are discussed for a few cases. An attempt is made to bring some systematics also in the evidence on excited‐state giant resonances through the 1p shell region. The photonuclear GDR is compared with other giant multipole excitations, mostly for the example of the 14C nucleus.

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Non-normal-parity states in A = 7 and 8 nuclei

Cited by 16 publications

References 63 publications

Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

Widths of the positive parity states in⁷Li for the (α+t) channel

Microscopic Studies of Electric Dipole Resonances in 1p Shell Nuclei

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Non-normal-parity states in A = 7 and 8 nuclei

Cited by 16 publications

References 63 publications

Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

Low-lying non-normal parity states in 8B measured by proton elastic scattering on 7Be

Widths of the positive parity states in7Li for the (α+t) channel

Microscopic Studies of Electric Dipole Resonances in 1p Shell Nuclei

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Widths of the positive parity states in⁷Li for the (α+t) channel