Seeking asymmetric rotors in mass region<i>A</i>∼100–110

Varshney, Mani; Singh, M. P.; Singh, Yuvraj; Bihari, Chhail; Varshney, Atul; Gupta, K. K.; Gupta, D. K.

doi:10.1088/0031-8949/83/01/015201

Cited by 14 publications

(7 citation statements)

References 22 publications

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“…The γ-intensity ratio between the 266-keV and 153-keV transitions measured here was consistent within experimental uncertainties with the value measured by Kanazawa et al [37], but not consistent with the value measured by Casten et al [38]. Our value for the intensity of the 266-keV γ ray per 100 γ rays of 153 keV is 64 (13), while those previous measurements recorded 41.7(90) [37] and 28.9(41) [28,38], respectively.…”

Section: Analysis and Resultssupporting

confidence: 77%

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New lifetime measurements inPd109and the onset of deformation atN=60

et al. 2015

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Several new sub-nanosecond lifetimes were measured in 109 Pd using the fast-timing βγγ(t) method. Fission fragments of the A=109 mass chain were produced by bombarding natural uranium with 30 MeV protons at the Jyväskylä Ion Guide Isotope Separator On-Line (IGISOL) facility. Lifetimes were obtained for excited states in 109 Pd populated following β decay of 109 Rh. The new lifetimes provide some insight into the evolution of nuclear structure in this mass region. In particular, the distinct structure of the two low-lying 7/2 + states occurring systematically across the Pd isotopic chain is supported by the new lifetime measurements. The available nuclear data indicate a sudden increase in deformation at N =60 which is related to the strong p-n interaction between πg 9/2 and νg 7/2 valence nucleons expected in this region.

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Section: Analysis and Resultssupporting

confidence: 77%

“…Refs. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17]). The precise origins and evolutions of such phenomena are still not well-understood.…”

Section: Introductionmentioning

confidence: 99%

New lifetime measurements inPd109and the onset of deformation atN=60

et al. 2015

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“…Many studies indicate that in Mo and Ru isotopes, the coexisting shapes tend to merge to form relatively rigid, triaxially-deformed ground states [22,25,36,43,48,49] or, in the least, potential energy surfaces that are γ-soft [21,23,[50][51][52]. The rigidity of triaxial deformation in nuclei remains an open question, but the general consensus is that triaxiality occurs in isotopes that are transitional between two regions where widely different shapes are favored: either between prolate and oblate regions, or between spherical and substantially (quadrupole) deformed regions [14,21,24].…”

Section: Introductionmentioning

confidence: 99%

New insights into triaxiality and shape coexistence from odd-mass Rh109

et al. 2018

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Rapid shape evolutions near A=100 are now the focus of much attention in nuclear science. Much of the recent work has been centered on isotopes with Z≤40, where the shapes are observed to transition between near-spherical to highly-deformed with only a single pair of neutrons added. At higher Z, the shape transitions become more gradual as triaxiality sets in, yet the coexistence of varying shapes continues to play an important role in the low-energy nuclear structure, particularly in the odd-Z isotopes. This work aims to characterize competing shapes in the triaxial region between Zr and Sn isotopes using ultra-fast timing techniques to measure lifetimes of excited states in the neutron-rich nucleus, 109 Rh. The measurements confirm the persistence at higher-Z of similarlylarge deformations observed near Z=40. Moreover, we show that new self-consistent mean-field calculations, with proper treatment of the odd nucleon, are able to reproduce the coexisting triaxial and highly-deformed configurations revealing, for the first time, the important contribution of the unpaired nucleon to these different shapes based on the blocking of specific single-particle orbitals.

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“…Most of the atomic nuclei are known to have spherical or prolate ground state shapes except in few regions on the nuclear chart where oblate and triaxial shapes [23,24,33] are predominant. The nuclear masses around A∼100 [7,[13][14][15]17,28,29,32] offer an interesting region to explore shape changes and shape coexistence in the vicinity of Z > 40 and then transition towards less deformed to spherical while approaching shell closure Z = 50.…”

Section: Introductionmentioning

confidence: 99%

Study of Excitation Functions of (p, n) Reactions for 56Fe and 57Fe Target from Threshold to 30 MeV

Suchiang¹,

Jyrwa

2015

JNP

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A theoretical investigation on the shape transitions with neutron number, temperature and spin for A = 100 isobars of Z = 42 to 50 is presented. A variety of shape transitions are observed while moving from neutron rich 100 Mo to proton rich 100 Sn with predominant triaxiality. Temperature and spin induced shape transitions are explored within the microscopic theoretical framework of statistical theory of hot rotating nuclei. Prolate non-collective -a rare shape phase is reported in this mass region on the proton rich side of the nuclear chart.

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Seeking asymmetric rotors in mass regionA∼100–110

Cited by 14 publications

References 22 publications

New lifetime measurements inPd109and the onset of deformation atN=60

New lifetime measurements inPd109and the onset of deformation atN=60

New insights into triaxiality and shape coexistence from odd-mass Rh109

Study of Excitation Functions of (p, n) Reactions for 56Fe and 57Fe Target from Threshold to 30 MeV

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