The 4433 and 6450 keV states in 21Ne

Rolfs, C.; Kuhlmann, E.; Riess, F.; Kraemer, R.W.

doi:10.1016/0375-9474(71)90056-x

Cited by 25 publications

(35 citation statements)

References 16 publications

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“…Rolls et al [4,5] and Kuhlmann et al [6] used the ~80(~, ny) reaction to make spin(-parity) assignments to many levels, the highest lying of these being the 6446 keV, J== 13/2 + state. Rolls et al [4,5] and Kuhlmann et al [6] used the ~80(~, ny) reaction to make spin(-parity) assignments to many levels, the highest lying of these being the 6446 keV, J== 13/2 + state.…”

Section: Introductionmentioning

confidence: 99%

“…Appreciable spectroscopic factors for stripping are observed (Table4) in the cases of the 3/22, 3/23 and 5/23 states while spectroscopic factors for pick-up are appreciable in the cases of the 3/2 z and 5/23 states. Appreciable spectroscopic factors for stripping are observed (Table4) in the cases of the 3/22, 3/23 and 5/23 states while spectroscopic factors for pick-up are appreciable in the cases of the 3/2 z and 5/23 states.…”

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confidence: 98%

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Structure of the mirror nuclei21Ne and21Na

Hoffmann

Betz

Röpke

et al. 1989

Z. Physik A - Atomic Nuclei

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The y-decay of levels in 2aNe up to 10 MeV excitation energy has been investigated by n-y coincidence measurements initiated with the 180(a, ny) reaction at 12, 13, 14.5 and 15.4 MeV bombarding energies. Spin(-parity) assignments of excited states are obtained by combining the n-y angular correlation measurements performed at E~ = 11, 11.82 and 13.6 MeV with a consideration of lifetimes, ne~atron penetrabilities of the unbound states, and information from the mirror nucleus 21Na. The resulting values of Ex[keV]-2J ~ are as follows: 4525-5 +, 4686-3 +, 5431-7 +, 5549-3 +, 5819-7-, 6175-7 +, 6268-9 +, 6550-9, 6639-9, 7006-7 +, 7041-9, 7356-7 or 9, 7422-11 (-t, 7648-7 +, 7981-11 or (7+), 8154-9, 8240-11, 8664-9-or 11 or 13-, 9401-13-, 9867-13-or 15 +, 9941-13-or 15 or 17 +. The assignment of mirror levels in 21Ne -2~Na has been extended to the 6175 keV level of 2aNe. Excitation energies, electromagnetic properties, Gamow-Teller matrix elements and spectroscopic factors of positive parity states are compared with the results of shell-model calculations which employ a unified s-d shell Hamiltonian and the unrestricted configuration space of the 0d5/2 -1 s~/2-Od3/2 shell. Collective properties contained in shell model wave functions are explored up to the termination of bands at J= 17/2 or 19/2. The spectrum of intruder states in 2~Ne is observed to begin with a 5628 keV, J~=7/2 + state. The 7422, 8664 and 9401 keV levels are assigned as members of previously established negative-parity rotational bands.

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Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 98%

Structure of the mirror nuclei21Ne and21Na

Hoffmann

Betz

Röpke

et al. 1989

Z. Physik A - Atomic Nuclei

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“…In the last columns the extracted lifetimes are compared with previous results. The errors given include the uncertainty of the stopping data, which was assumed to be 5% for __< 50 fs, 10 % for 50 fs _< z -< 100 fs and 20 % for longer [5] is good, and with the accuracy of the present data, due to the well defined kinematics, large recoil and therefore well known stopping data, the diverging sets of lifetimes listed in Reference i can be checked.…”

Section: Resultsmentioning

confidence: 98%

“…The known M1 and E2 transition rates within the ground state band are described equally well by the rotational [4,5] and the shell model [6]. Discrepancies were found for the E1 interband transitions and M1 transitions from excited bands [7,8].…”

Section: Introductionmentioning

confidence: 94%

DSA lifetime measurements in21Ne at high recoil velocity

1977

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States in 21Ne up to 5 MeV excitation energy have been populated using the inverted reaction 2H(2~ PT). The Doppler shift attenuation (DSA) analysis of the P7 coincidence spectra taken in a Ge(Li) detector at 45 ~ and 135 ~ and an annular silicon surface barrier detector near 0 ~ yielded the lifetimes of 8 states in 2~Ne. Due to the large recoil of vl/c~-4%o three new lifetimes were determined for the short lived levels at 2.80, 4.68 and 4.73 MeV, namely 10+4 fs, 16_+4 fs and 10_+4 fs, respectively. The results are compared with rotational and shell model calculations.

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“…The (c~, ny) reactions leading to 4n+ 1 nuclei of the s-d shell have proved [1][2][3] to be powerful spectroscopic tools, especially in the location of high spin states. The experimental method commonly applied is the measurement of direct y-ray spectra, preferably [3] with anti-Compton spectrometers.…”

Section: Introductionmentioning

confidence: 99%