High-spin states in27Al

Röpke, H.; Betz, P.; Bender, G.; Glattes, V.; Hammel, G.; Brendler, W.

doi:10.1007/bf01668915

Cited by 15 publications

(14 citation statements)

References 17 publications

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“…Between 6.3 and 7.5 MeV all levels of high-spin (I > 9/2) have been located. For this reason, and also in view of the existing gaps in our knowledge of higher excited states, we have resumed previous studies [13] of 27A1 with the 24Mg(e, py) and 26Mg(p, ~) reactions. For instance, the number of assigned I~=11/2 + states seems to exceed the number of theoretical levels, while the opposite is the case for the P=9/2 + states.…”

Section: Introductionmentioning

confidence: 97%

“…Extensive y-spectroscopic investigations of 2VA1 have been performed in the past using the radiative capture reactions 26Mg(p, 7) [6][7][8][9] and 23Na(e, 7) [10][11] and also by the 24Mg(c~, PY) reaction [12][13][14]. As a result all levels up to 5247 keV excitation energy have unique spin-parity assignments and the coverage of y-decay modes of levels is close to complete up to 6.3 MeV excitation energy.…”

Section: Introductionmentioning

confidence: 99%

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The structure of27Al

Lickert

Brenneisen

Glatz

et al. 1988

Z. Physik A - Atomic Nuclei

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Gamma decay modes and spin assignments of levels in 27A1 have been investigated by proton-y-ray angular correlation measurements in the 24Mg(~, PY) reaction at 14.2, 15 and 15.6 MeV bombarding energy and by y-ray angular distribution measurements on the Ep = 1820, 2114, 2293 and 2574 keV resonances of the 26Mg(p, 7) reaction. Unique spin assignments were obtained as follows: 1=3/2 for the 5827 keV state, I=5/2 for the 6115, 6465, 6765, 7577, 7721, 8097, 8136, 8324 keV states, I=7/2 for the 5433, 6533, 7413, 8037, 8442, 8586 keV states, I = 9/2 for the 5418, 6512, 6713, 7997 keV states, I = 11/2 for the 5500, 6948, 7400, 8396 keV states. The level scheme and electromagnetic properties of levels are compared with the results of shell model calculations which use the complete configuration space of the 0d5/2-1 s 1~2-0d3/2 shell and the unified s-d shell Hamiltonian. The agreement is good to excellent and extends into the region of high level density above 7 MeV excitation energy. The total B(M1T) below 8.5 MeV excitation energy is evaluated, using published resonance fluorescence and (e, e') data, and quenching relative to the flee-nucleon predictions is reexamined. Evidence in favour of a prolate ground state deformation of 27A1 and implications of this work for the astrophysically interesting 26Al(p, 7) reaction are discussed.

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Section: Introductionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

The structure of27Al

Lickert

Brenneisen

Glatz

et al. 1988

Z. Physik A - Atomic Nuclei

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“…The yrast states of 27A1 are well established up to 11/2 +. At least one of the two levels at 7.286 MeV and at 7.444 MeV is very likely to have 13/2 + [2,3]. Many states around 12 MeV excitation have been located by a-capture in 23Na [4] and spins up to 11/2 have been assigned.…”

Section: Introductionmentioning

confidence: 99%

“…However, with increasing spin a fairly stable deformation seems to develop. Within a strong coupling picture the 5/2+-ground state and the 9/2 + state at 3.0MeV represent band heads of a K=5/2 + and a K = 9/2 + rotational band [2] with a moment of inertia 20/h 2 of approximately 6 MeV -1, a value typical for the neighbouring nuclei of the sd-shell. The yrast states of 27A1 are well established up to 11/2 +.…”

Section: Introductionmentioning

confidence: 99%

Properties of unbound high-spin states in27Al

et al. 1984

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Selectively excited high-spin states in 27A1 have been located by the reaction 12C(160,p)ZVA1. The excitation functions of these states have been measured at incident energies Ecm = 18.7 to 30.1 MeV at intervals of 150keV. They exhibit maxima of presumably non-statistical origin. At four different energies the subsequent decay of the 27A1 states has been studied by detecting the final heavy recoils with the Munich recoil spectrometer in coincidence with the proton emitted in the first stage of the reaction. Using this new method branching ratios of the 7-, ~-, and n-decay have been measured. Based on angular correlation arguments spins up to 27/2 h have been determined within the experimental accuracy of 1-2 h. The observations suggest a superdeformed shape of 27A1 at least in some of the states.

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“…Thus the hope was raised that the shell model would be the superior model for the transitional nuclei. To further test this idea we have extended our previous work [7,8] on the A=27 system from the T=1/2 levels of 27A1 to the T=3/2 levels of 27Mg. The investigation was performed using the 26Mg(d, pT) reaction.…”

Section: Introductionmentioning

confidence: 97%

The structure of27Mg from the26Mg(d, p?) reaction

et al. 1977

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The excited states of 27Mg have been investigated up to E~=7976 keV using the 26Mg(d, py) reaction. A measurement of proton-y-ray angular correlations at E~=6.5 MeV has yielded spin-parity assignments or restrictions of levels up to E x = 6508 keV and accurate excitation energies and branching ratios of levels up to Ex=7976 keV, respectively. The Doppler-shift attenuation of y-rays has been measured at E d = 5.5 MeV yielding information on the lifetimes of levels up to Ex=6009keV. The properties of positive-parity levels up to E~ = 5 MeV are successfully reproduced by recent shell-model calculations. The rotational model is also applicable to the description of collective properties without reaching the overall agreement of the shell model. The negative-parity states are well described by the rotational model.

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High-spin states in27Al

Cited by 15 publications

References 17 publications

The structure of27Al

The structure of27Al

Properties of unbound high-spin states in27Al

The structure of27Mg from the26Mg(d, p?) reaction

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