Polarization measurements and high-spin states in 8638Sr48

Kumar, Naveen; Kumar, Suresh; Kumar, V.; Mandal, S.; Palit, R.; Saha, S.; Sethi, J.; Trivedi, T.; Pancholi, S. C.; Srivastava, P. C.

doi:10.1016/j.nuclphysa.2016.05.018

Cited by 5 publications

(4 citation statements)

References 34 publications

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“…The behaviour of S(I) for Band 1 and Band 2 is compared with N = 42, 44 and 46 isotones of Se [52][53][54], Kr [23,54,55], Sr [54,55] and Zr [55,56] and the pattern of S(I) as a function of spin is shown in figure 5. The systematic evolution of excited levels of γ-band in Sr isotopes with N = 42 [25], 44 [26], 46 and 48 [27] is presented in figure 6.…”

Section: Lower Part Of Band 1 and Band 2: The γ-Bandmentioning

confidence: 99%

“…The 70,72 Ge [19,20], 74 Se [21], 76,78,82 Kr [22][23][24] and 80,82 Sr [25,26] nuclei were reported to have K π = 2 + band. The Yrast band of Strontium (Sr) even-even isotopes having A 88 manifests a shape transition from deformed ( 80,82 Sr [25,26]) to spherical( 86,88 Sr [27,28]) at N = 44-46 and therefore, the 84 Sr is expected to be a transitional nucleus. Thus, to identify the structure of the octupole and γ-band, the excited states of 84 Sr were re-investigated in this work.…”

Section: Introductionmentioning

confidence: 99%

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Indications of octupole correlation in ⁸⁴Sr

Anuj

Kumar

et al. 2023

Phys. Scr.

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Excited states in the 84 Sr nucleus were investigated via theGe( 12 C,4n) 84 Sr reaction at a beam energy of 58 MeV. The de-excited γ-rays weredetected using the Indian National Gamma Array (INGA) spectrometer at Inter-University Accelerator Center, New Delhi. Directional Correlation from Oriented(DCO) states ratio and the polarization asymmetry (∆) measurements were done toconfirm the spin-parity of the low-lying states. Eight new γ-ray transitions were placedin the level scheme of 84 Sr. The systematic behaviour of energy staggering S(I) of theγ-band (Band 1 and Band 2) was compared with the γ-bands in the mass A≈80 regionand the nuclei of other mass region with similar behaviour (odd-I down). The E1character is confirmed for strong γ-ray transitions connecting Band 3 to Yrast band.Comparison of new results such as B(E1)/B(E2) ratio, frequency ratio ω − /ω + andenergy displacement ∆E in 84 Sr with those of 72 Se, 150 Sm, 152 Gd, 220 Ra and 224 Thnuclei suggests the presence of octupole correlations in 84 Sr.

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Section: Lower Part Of Band 1 and Band 2: The γ-Bandmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Indications of octupole correlation in ⁸⁴Sr

Anuj

Kumar

et al. 2023

Phys. Scr.

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“…The level scheme up to 10.9 MeV excitation energy and maximum spin of ∼ 19 have been reported in Ref. [16].…”

Section: Introductionmentioning

confidence: 97%

“…Motivated by the success of our shell model results in this region for recently measured high spin states of 88 Zr [13], 89 Zr [14], 85 Sr [15] and 86 Sr [16], in the present work we will be focusing on the shell model study of recently populated high-spin states of 87 Sr and 87 Zr.…”

Section: Introductionmentioning

confidence: 99%

High-spin Structure of $^{87}$Sr and $^{87}$Zr Nuclei: Shell-model Interpretation

Srivastava¹,

Kumar²,

Ermamatov³

2016

Acta Phys. Pol. B

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In the present work we report a comprehensive analysis of shell model results for high-spin states of 87 Sr and 87 Zr for recently available experimental data within the full f 5/2 pg 9/2 model space using JUN45 and jj44b effective interactions developed for this model space. In this work we have compared the energy levels, electromagnetic transition probabilities, quadrupole and magnetic moments with available experimental data. We have confirmed structure of high-spin states of these two nuclei which were tentatively assigned in the recent experimental work. In the case of 87 Sr, for positive parity states up to ∼ 7.5 MeV, both interactions predict very good agreement with experimental data, while negative parity states are slightly suppressed in jj44b calculation. For the 87 Zr nucleus, the jj44b interaction predicts higher energies for the negative parity states beyond J ≥ 27/2 − . The configuration, which have one hole in νg 9/2 orbital, is responsible for generating the states in 87 Sr. In the case of 87 Zr, low-lying positive parity states come with the configuration having three holes in the νg 9/2 , while the odd-parity states have configuration ν(f −1 5/2 g −2 9/2 ). PACS numbers: 21.60.Cs, 27.50.+e * pcsrifph@iitr.ac.in Experimental information on low-lying single-particle excited states are available for many nuclei. Because of the advancement in experimental techniques now it is possible to populate high spin states of nuclei beyond Ni. These experimental results are stringent test for the predicting power of shell model for high spin excited states. It is possible to test two-body matrix elements for predicting the high-spin states which are generated by aligning the angular momenta due to broken nucleon pairs. The nuclei in Sr-Zr region show many interesting features, such as spherical shell, isomeric states, candidates of double and neutrinoless double beta decay [1-12].High spin states of 88 Zr have been recently populated up to ∼ 20 and an excitation energy of 10 MeV was measured in 80 Se( 13 C,5n) 88 Zr fusion evaporation reaction [13]. Similarly, the high spin states of 89 Zr were populated using the fusion evaporation reaction 80 Se( 13 C,4n) 89 Zr. The observed high-spin states up to 10 MeV excitation energy and spin ∼ 37/2 are reported in Ref. [14]. The dominance of single-particle excitations is shown for both positive and negative parity states. The high-spin band structure of 85 Sr was populated in the reaction 76 Ge( 13 C,4n) 85 Sr [15]. The spin and parity of different levels up to the spin of ∼ 35/2 and an excitation energy ∼ 7.5 MeV were established. Here shell model explains various features, such as the odd-even staggering, very well. In the case of 86 Sr the high-spin states were populated using 76 Ge( 13 C,3n) 86 Sr reaction. The level scheme up to 10.9 MeV excitation energy and maximum spin of ∼ 19 have been reported in Ref. [16].Experimentally, the high-spin structure of 87 Sr previously was studied in Refs. [17,18].Recently, using the fusion-evaporation reaction 82 Se( 9 Be,4n...

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