High spin structure of 
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 and the FSU cross-shell interaction

Abromeit, B.; Tabor, S. L.; Tripathi, Vandana; Lubna, R. S.; Caussyn, D. D.; Dungan, R.; Kravvaris, Konstantinos; Rubino, E.; Tai, Pei-Luan; Volya, Alexander

doi:10.1103/physrevc.100.014310

Cited by 7 publications

(5 citation statements)

References 15 publications

(18 reference statements)

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“…Additionally, our group has recently developed a new spsdpf crossshell interaction. It has been quite successful in predicting higher-spin cross-shell excitations in nuclei a little lighter than A ≈ 40 and is compared to our experimental results further on [4][5][6].…”

Section: Introductionmentioning

confidence: 71%

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Multiparticle-hole excitations in nuclei near N = Z = 20: $^{41}$K

Rubino,

Tabor,

Tripathi

et al. 2022

Preprint

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This experimental study of high-spin structure near N = Z = 20 nuclei was focused on 41 K, but will also mention three newly observed γ transitions in 41 Ca observed in the same reaction. Highspin states were populated using the 26 Mg( 18 O, p2nγ) 41 K and 26 Mg( 18 O, 3nγ) 41 Ca reactions. The experiment was carried out at an incident beam energy of 50 MeV at the Florida State University (FSU) John D. Fox Superconducting Linear Accelerator Laboratory and used the FSU high-purity germanium detector array. The 41 K level scheme was extended to 12325 keV, possibly with J π = 25/2 − or 27/2 + , by means of 25 new transitions and that of 41 Ca to 9916 keV. Linear polarization and a measure of angular distribution results are also reported and used to provide information on the spins and parities of several states in the 41 K decay scheme. The results have been compared to the spsdpf cross-shell FSU shell model interaction calculations. The theoretical results from configurations involving no or one additional nucleon promoted from the sd to the f p shell agree relatively well with the energies of known states, while those that involve multi-particle excitations paint an interesting and complex picture of interplay between single-particle excitations, collective pairing, and deformation. This presents an interesting challenge for future theory.

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Section: Introductionmentioning

confidence: 71%

“…Clearly higher spin positive-parity states within the range of this experiment will involve 2ph excitations, note that the FSU interaction was not directly fitted to any 2ph states although some reasonable agreement has been reported in Refs. [4] and [5]. The 0ph FSU interaction calculations are from the USDB [18] interaction.…”

Section: Discussionmentioning

confidence: 99%

Multiparticle-hole excitations in nuclei near N = Z = 20: $^{41}$K

Rubino,

Tabor,

Tripathi

et al. 2022

Preprint

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“…No 0p0h sd states are included in this figure or the fit because the USDB interaction which was previously fitted to them was used unchanged. Predictions from the FSU interaction have compared well with experiment for 38 Cl [9] and 39 Ar [12]. In the present report we are applying the model to understand few interesting features of the sd-shell nuclei.…”

Section: Introductionmentioning

confidence: 71%

“…These agreed within 200 keV with the experimental states. The other test was performed on 38 Ar, since experimental states up to 8 + and (10 + ) are known [12]. Calculations using the USD family of interactions agree within 200 keV with the excitation energy of the lowest 2 + state of 38 Ar, but over-predict the lowest experimental 4 + level by over 3 MeV.…”

Section: Fully Aligned Statesmentioning

confidence: 99%

Evolution of the N=20 and 28 Shell Gaps and 2-particle-2-hole states in the FSU Interaction

Lubna,

Kravvaris,

Tripathi

et al. 2020

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The FSU spsdf p cross-shell interaction for the shell model was successfully fitted to a wide range of mostly intruder negative parity states of the sd shell nuclei. This paper reports the application of the FSU interaction to systematically trace out the relative positions of the effective singleparticle energies of the 0f 7/2 and 1p 3/2 orbitals, the evolution from normally ordered low-lying states to the "Island of Inversion" (IoI), and the behavior of a wide range of excited states with a 0f 7/2 proton and neutron coupled to maximum spin of 7 . Above a proton number of about 13 the 0f 7/2 orbital lies below that of 1p 3/2 , which is considered normal ordering, but systematically at Z = 10 to 12 the orbitals cross. The calculations reproduce well the 2p2h -0p0h inversion in the configurations of nuclei inside the IoI, they reproduce the absolute binding energies and the transition to normal ordering as the proton number approaches that of the neutrons. The important role of 1p 3/2 neutron pairs in the IoI is also demonstrated. The calculations account well for the energies of the fully aligned states with 0, 1, or 2 individual sd nucleon aligned in spin with the aligned π0f 7/2 -ν0f 7/2 pair and reproduce well their systematic variation with A and number of aligned sd nucleons. The results presented in this paper give hope for the predictive power of the FSU interaction for more exotic nuclei to be explored in near future.

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“…The study of SD bands has been an active field in nuclear physics and the rotational bands have been observed up to high spins in various mass regions [3] since its discovery in 1986 [4]. Recently, the high-spin structures in light N ≃ Z nuclei near the doubly-magic 40 Ca nucleus have been studied experimentally [5][6][7][8][9][10][11][12][13][14][15][16], and SD bands have been observed in such as 36 Ar [5,6], 40 Ar [9], 40 Ca [11,12], 42 Ca [17], and 44 Ti [16]. An interesting feature in this mass region is the coexistence of states with different shapes in low energy, which is caused by the single-particle excitations from the core and the coherent shell effects of neutrons and protons.…”

Section: Introductionmentioning

confidence: 99%

Signature dependent triaxiality for shape evolution from superdeformation in rapidly rotating $^{40}$Ca and $^{41}$Ca

Sakai,

Yoshida,

Matsuo

2020

Preprint

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We investigate the possible occurrence of the highly-elongated shapes near the yrast line in 40 Ca and 41 Ca at high spins on the basis of the nuclear energy-density functional method. Not only the superdeformed (SD) yrast configuration but the yrare configurations on top of the SD band are described by solving the cranked Skyme-Kohn-Sham equation in the three-dimensional coordinate-space representation. It is suggested that some of the excited SD bands undergo band crossings and develop to the hyperdeformation (HD) beyond J ≃ 25 in 40 Ca. We find that the change of triaxiality in response to rotation plays a decisive role for the shape evolution towards HD, and that this is governed by the signature quantum number of the last occupied orbital at low spins. This mechanism can be verified in an experimental observation of the positiveparity SD yrast signature-partner bands in 41 Ca, one of which (α = +1/2) undergoes crossings with the HD band while the other (α = −1/2) shows the smooth evolution from the collective rotation at low spins to the non-collective rotation with oblate shape at the termination.

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High spin structure of Ar39 and the FSU cross-shell interaction

Cited by 7 publications

References 15 publications

Multiparticle-hole excitations in nuclei near N = Z = 20: $^{41}$K

Multiparticle-hole excitations in nuclei near N = Z = 20: $^{41}$K

Evolution of the N=20 and 28 Shell Gaps and 2-particle-2-hole states in the FSU Interaction

Signature dependent triaxiality for shape evolution from superdeformation in rapidly rotating $^{40}$Ca and $^{41}$Ca

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