<i>β</i>-decay spectroscopy of neutron-rich<sup>160,161,162</sup>Sm isotopes

Patel, Z.; Podolyák, Zs.; Walker, P. M.; Regan, P. H.; Söderström, P.-A.; Watanabe, H.; Ideguchi, E.; Simpson, G. S.; Nishimura, S.; Browne, F.; Doornenbal, P.; Lorusso, G.; Rice, S.; Sinclair, L.; Sumikama, T.; Wu, J.; Xu, Z. Y.; Aoi, N.; Baba, H.; Garrote, F. L. Bello; Daido, R.; Dombrádi, Zs.; Fang, Y.; Fukuda, N.; Gey, G.; Go, S.; Gottardo, A.; Inabe, N.; Isobe, T.; Kameda, D.; Kobayashi, K.; Kobayashi, Mariko; Komatsubara, T.; Kojouharov, I.; Kubo, T.; Kurz, N.; Kuti, I.; Li, Z.; Liu, H. L; Matsushita, M.; Michimasa, S.; Moon, C.-B.; Nishizuka, H.; Nishizuka, I.; Odahara, A.; Şahin, E.; Sakuraï, H.; Schaffner, H.; Suzuki, Hiroshi; Takeda, Hiroyuki; Tanaka, M.; Taprogge, J.; Vajta, Zs.; Xu, F. R.; Yagi, A.; Yokoyama, R.

doi:10.1051/epjconf/201612302002

Cited by 3 publications

(13 citation statements)

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“…Therefore all the moments of inertia display a gradual and smooth variation with frequency ω. [4,9] and Yokoyama et al [5] independently. The configuration is assigned as a two-neutron ν 1 2 − [521]⊗ν 7 2 + [633] configuration by Nilsson-BCS [4,9], deformed Hartree-Fock [5], projected shell model [55] and present PNC-CSM calculations.…”

Section: E Moment Of Inertiamentioning

confidence: 99%

“…4 it shows the occupation probabilities n µ versus frequency ω of each cranked Nilsson orbital µ near the FIG . 5. (color online) Calculated kinematic moments of inertia for samarium and gadolinium isotopes, compared with available experimental data [8,9,11,12,52,53]. Experimental data are denoted by symbols and the multi-particle state configurations of these bands are labelled by K π .…”

Section: Occupation Probabilitymentioning

confidence: 99%

“…In Fig. 5 it shows the comparison of the calculated kinematic moments of inertia and the available experimental data [8,9,11,12,52,53] for samarium and gadolinium isotopes. The experimental data are reproduced well by the theoretical results.…”

Section: E Moment Of Inertiamentioning

confidence: 99%

“…The nuclear structure inputs of the rare-earth nuclei can lead to an improved understanding of the r−process nucleosynthesis [3]. However, due to their neutron excess, detailed structure informations are very difficult to be revealed by the experiment in these rare-earth neutron-rich nuclei.The recent experimental progresses in the neutron-rich A = 150 − 170 region [4][5][6][7][8][9][10][11][12][13] are attributed to a great extent to the existence of the nuclear isomeric state. A nucleus can be "traped" in an aligned spin orientation relative to its symmetric axis to form the K isomeric state (or K-isomer), where K is a quantum number representing the projection of the total nuclear spin along the symmetry axis of the nucleus.…”

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confidence: 99%

“…Investigations of K-isomers have been reviewed recently in Refs. [14][15][16][17][18].An impressive progress has been achieved in experimental studies of samarium and gadolinium isotopes very recently [4,5,8,9,11,12]. The most exiting discoveries include: 160 Sm became the lightest nucleus with a known four-quasiparticle K-isomer [8], K-isomers were firstly observed in very neutron-rich nuclei 164 Sm and 166 Gd [11] and in odd-A samarium isotopes [4,5].…”

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Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

He¹,

Li²

2018

Phys. Rev. C

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Inspired by the newly discovered isomeric states in the rare-earth neutron-rich nuclei, high-K isomeric states in neutron-rich samarium and gadolinium isotopes are investigated within the framework of the cranked shell model (CSM) with pairing correlation treated by a particle-numberconserving (PNC) method. The experimental multi-particle state energies and moments of inertia are reproduced quite well by the PNC-CSM calculations. A remarkable effect from the high-order deformation ε6 is demonstrated. Based on the occupation probabilities, the configurations are assigned to the observed high-K isomeric states. The lower 5 − isomeric state in 158 Sm is preferred as the two-proton state with configuration π 5 2 + [413]⊗π 5 2 − [532]. More low-lying two-particle states are predicted. The systematics of the electronic quadrupole transition probabilities, B(E2) values along the neodymium, samarium, gadolinium and dysprosium isotopes and N = 96, 98, 100, 102 isotones chains is investigated to reveal the midshell collectivities. * hext@nuaa.edu.cn arXiv:1808.03945v1 [nucl-th] 12 Aug 2018The rare-earth neutron-rich nuclei lie in the midshell region between the closed shells of proton Z = 50, 82 and neutron N = 82, 126. The high spin spectroscopy of these nuclei can provide important insights into the midshell collectivity, changes in nuclear shape and deformed sub-shells in a less-explored single-particle spectrum region. Furthermore, the pygmy rare-earth peak at A ∼ 160 of the r−process abundance is believed to arise from strong midshell nuclear deformation [1,2]. The nuclear structure inputs of the rare-earth nuclei can lead to an improved understanding of the r−process nucleosynthesis [3]. However, due to their neutron excess, detailed structure informations are very difficult to be revealed by the experiment in these rare-earth neutron-rich nuclei.The recent experimental progresses in the neutron-rich A = 150 − 170 region [4][5][6][7][8][9][10][11][12][13] are attributed to a great extent to the existence of the nuclear isomeric state. A nucleus can be "traped" in an aligned spin orientation relative to its symmetric axis to form the K isomeric state (or K-isomer), where K is a quantum number representing the projection of the total nuclear spin along the symmetry axis of the nucleus. K-isomer arises from the multi-particle state, of which the transition to a lower energy state with a different K value is inhibited by the ∆K ≤ λ selection rule where λ is the multipole order of the transition. However, symmetry-breaking processes make these transitions possible to process with the ∆K − λ related hindrance factor [14,15]. The multi-particle state is formed by breaking pairs of nucleon. The excitation energy and configuration of multi-particle state depend strongly on the position of the specific single-particle orbitals near the Fermi surface and correlations, such as pairing. K-isomer appears only in axially symmetric deformed nuclei well away from the closed shell. This implies that K-isomer cannot be a pure intrinsi...

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Section: E Moment Of Inertiamentioning

confidence: 99%

Section: Occupation Probabilitymentioning

confidence: 99%

Section: E Moment Of Inertiamentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

He¹,

Li²

2018

Phys. Rev. C

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High-K isomer and the rotational properties in the odd-Z neutron-rich nucleus M¹⁶³Eu *

Chen²

2019

Chinese Phys. C

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The newly observed isomer and ground-state band in the odd-Z neutron-rich rare-earth nucleus 163 Eu are investigated by using the cranked shell model (CSM) with pairing treated by the particlenumber conserving (PNC) method. This is the first time detailed theoretical investigations are performed of the observed 964(1) keV isomer and ground-state rotational band in 163 Eu. The experimental data are reproduced very well by the theoretical results. The configuration of the 964(1) keV isomer is assigned as the three-particle state 13 2 − (ν 7 2 + [633]⊗ν 1 2 − [521]⊗π 5 2 + [413]). Morelow-lying multi-particle states are predicted in 163 Eu. Due to its significant effect on the nuclear mean field, the high-order ε 6 deformation plays an important role in the energy and configuration assignment of the multi-particle states. Compared to its neighboring even-even nuclei 162 Sm and 164 Gd, there is a 10% ∼ 15% increase of J (1) of the one-particle ground-state band in 163 Eu. This is explained by the pairing reduction due to the blocking of the nucleon on the proton π 5 2 + [413] orbital in 163 Eu. * hext@nuaa.edu.cn 1 arXiv:1906.06473v1 [nucl-th]

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Isomer-delayed γ -ray spectroscopy of A=159–164 midshell nuclei and the variation of K -forbidden
Patel¹,
Walker²,
Podolyák³
et al. 2017
Phys. Rev. C
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Excited states have been studied in 159 Sm, 161 Sm, 162 Sm (Z = 62), 163 Eu (Z = 63), and 164 Gd (Z = 64), populated by isomeric decay following 238 U projectile fission at RIBF, RIKEN. The isomer half-lives range from 50 ns to 2.6 μs. In comparison with other published data, revised interpretations are proposed for 159 Sm and 163 Eu. The first data for excited states in 161 Sm are presented, where a 2.6-μs isomer is assigned a three-quasiparticle, K π = 17/2 − structure. The interpretation is supported by multi-quasiparticle Nilsson-BCS calculations, including the blocking of pairing correlations. A consistent set of reduced E1 hindrance factors is obtained. Limited evidence is also reported for isomeric decay in 163 Sm, 164 Eu, and 165 Eu.

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β-decay spectroscopy of neutron-rich^160,161,162Sm isotopes

Abstract: Abstract. Neutron-rich 160,161,162 Sm isotopes have been populated at the RIBF, RIKEN via β decay for the first time. β-coincident γ rays were observed in all three isotopes including γ rays from the isomeric decay of 160

Cited by 3 publications

References 13 publications

Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

High-K isomer and the rotational properties in the odd-Z neutron-rich nucleus M¹⁶³Eu *

Isomer-delayed γ -ray spectroscopy of A=159–164 midshell nuclei and the variation of K -forbidden
Patel¹,
Walker²,
Podolyák³
et al. 2017
Phys. Rev. C
Self Cite
19
1
24
0
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β-decay spectroscopy of neutron-rich160,161,162Sm isotopes

Abstract: Abstract. Neutron-rich 160,161,162 Sm isotopes have been populated at the RIBF, RIKEN via β decay for the first time. β-coincident γ rays were observed in all three isotopes including γ rays from the isomeric decay of 160

Cited by 3 publications

References 13 publications

Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

Insight into nuclear midshell structures by studying K isomers in rare-earth neutron-rich nuclei

High-K isomer and the rotational properties in the odd-Z neutron-rich nucleus M163Eu *

Isomer-delayed γ -ray spectroscopy of A=159–164 midshell nuclei and the variation of K -forbidden Patel1, Walker2, Podolyák3 et al. 2017Phys. Rev. CSelf Cite191240View full textAdd to dashboardCite

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β-decay spectroscopy of neutron-rich^160,161,162Sm isotopes

High-K isomer and the rotational properties in the odd-Z neutron-rich nucleus M¹⁶³Eu *

Isomer-delayed γ -ray spectroscopy of A=159–164 midshell nuclei and the variation of K -forbidden
Patel¹,
Walker²,
Podolyák³
et al. 2017
Phys. Rev. C
Self Cite
19
1
24
0
View full text Add to dashboard Cite