Gamma-Ray Spectroscopy of Low-Lying Levels in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Mg</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>28</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Fisher, T. R.; Bardin, Thomas; Becker, J. A.; Chase, L. F.; Kohler, D.; McDonald, Roderick P.; Poletti, A.R.; Pronko, J.G.

doi:10.1103/physrevc.7.1878

Cited by 8 publications

(9 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Taking into account the data from Refs. [13,14], the CCEI calculations with effective charges best reproduce the trend of observed B(E2; I i → I i −2) values in 28 Mg. For the SA-NCSM calculations, uncertainties were determined for each data point and are plotted in Figure 9, with lower and upper limits corresponding to calculations in 9 and 11 major harmonic oscillator shells respectively. Taking these uncertainties into consideration, the SA-NCSM calculations are in the best agreement with the experimentally observed B(E2; 4 + 1 → 2 + 1 ) value, and are within the limits of the other data from this study.…”

Section: A Collectivity In the Yrast Bandmentioning

confidence: 60%

“…For the 4 + 1 level at 4021. 4(3) keV, the present evaluated lifetime of 1.5(5) × 10 2 fs [19] was based on two conflicting measurements by Fintz et al [13] and Fisher et al [14], as summarized in Table V. This disagreement has implications for the structure of the yrast band, as the measurement of Fintz et al implies increasing B(E2; I i → I i − 2) transition strength with increasing spin -consistent with a rotational or vibrational model, while the measurement of Fisher et al implies the opposite.…”

Section: A Collectivity In the Yrast Bandmentioning

confidence: 99%

“…Experimentally determined B(E2) values for the yrast band of28 Mg, from this work and previous studies[13,14], compared to calculated values derived from various interaction models.…”

mentioning

confidence: 90%

“…Even for low-lying levels, the existing lifetime measurements often carry large uncertainties. For instance, the two existing measurements of the 4 + 1 → 2 + 1 transition rate in 28 Mg disagree significantly [13,14], leading to opposing conclusions as to the degree of collectivity of states in the yrast band. Furthermore, almost no data exists for states with spin I > 4 and/or high excitation energy where the influence of intruder orbitals is expected.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Structure of Mg28 and influence of the neutron pf shell

et al. 2019

View full text Add to dashboard Cite

Gamma-ray spectroscopy and lifetime measurements using the Doppler Shift Attenuation Method (DSAM) were performed on the nucleus 28 Mg near the N = 20 'island of inversion', which was populated using a 12 C(18 O,2p) 28 Mg fusion-evaporation reaction to investigate the impact of shell evolution on its high-lying structure. Three new levels were identified at 7203(3), 7747(2), and 7929.3(12) keV along with several new gamma rays. A newly extracted B(E2; 4 + 1 → 2 + 1) of 42(7) e 2 fm 4 indicates reduced collectivity in the yrast band at high spin, consistent with ab initio SA-NCSM calculations. At high excitation energy, evidence for the population of intruder orbitals was obtained through identification of negative parity levels (I π = (0, 4) − , (4, 5) −). Calculations using the SDPF-MU interaction indicate that these levels arise from single neutron excitation to the pf shell and provides evidence for the lowering of these intruder orbitals approaching the 'island of inversion'.

show abstract

Section: A Collectivity In the Yrast Bandmentioning

confidence: 60%

Section: A Collectivity In the Yrast Bandmentioning

confidence: 99%

“…Experimentally determined B(E2) values for the yrast band of28 Mg, from this work and previous studies[13,14], compared to calculated values derived from various interaction models.…”

mentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure of Mg28 and influence of the neutron pf shell

et al. 2019

View full text Add to dashboard Cite

show abstract

“…The level structure of 28 Mg has been investigated by the 26 Mg(t, p) 28 Mg reaction [21][22][23][24] and the β decay of 28 Na [14,25]. Middleton and Pullen [22] assigned the spins and parities of nine levels by the angular distribution of the proton.…”

Section: Introductionmentioning

confidence: 99%

Structure of28Mg studied byβ-decay spectroscopy of spin-polarized28Na: The first step of systematic studies on neutron-rich Mg isotopes

et al. 2012

View full text Add to dashboard Cite

As the first step of systematic studies on neutron-rich Mg isotopes, the structure of 28 Mg has been investigated by β-decay spectroscopy of spin-polarized 28 Na at TRIUMF. Spin-parity assignments have been successfully performed for levels in 28 Mg by taking advantage of the anisotropic β decay. Previous assignments for three levels were reconfirmed. New assignments were performed for four levels including a newly found 2 + level at 7.461 MeV. The experimental results were compared, on a level-by-level basis, with the shell-model calculation in the model space restricted to the sd shell. Overall good agreement between the experimental and theoretical results indicates dominance of the normal configurations in most of the 28 Mg levels. High performance of the present method promises successful application to heavier Mg isotopes to elucidate the shell evolution in the region of the N = 20 island of inversion.

show abstract

Nuclear Data Sheets for A = 28

Basunia

2013

Nuclear Data Sheets

View full text Add to dashboard Cite

Gamma-Ray Spectroscopy of Low-Lying Levels inMg28

Cited by 8 publications

References 12 publications

Structure of Mg28 and influence of the neutron pf shell

Structure of Mg28 and influence of the neutron pf shell

Structure of28Mg studied byβ-decay spectroscopy of spin-polarized28Na: The first step of systematic studies on neutron-rich Mg isotopes

Nuclear Data Sheets for A = 28

Contact Info

Product

Resources

About