Identification of one-phonon and two-phonon γ-vibrational bands in odd-Z 103Nb nucleus

Wang, Jianguo; Zhu, S.; Hamilton, J. H.; Ramayya, A. V.; Hwang, J. K.; Liu, S.H.; Li, K.; Luo, Y. X.; Rasmussen, J. O.; Lee, I.Y.; Ding, H. B.; Xu, Q.; Gu, Long; Yeoh, E. Y.; Zhang, Xiao; Ma, W.C.

doi:10.1016/j.physletb.2009.04.057

Cited by 19 publications

(19 citation statements)

References 31 publications

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“…The first observation was made 10 years later in 105 Mo [7]. Soon after this, similar bands were observed in 103 Nb [8] and in 107 Tc [9]. The first realistic theoretical calculation in terms of the triaxial projected shell model was reported for 103 Nb [10] in 2010.…”

Section: Introductionmentioning

confidence: 64%

Single-phonon and multi-phonon excitations of theγvibration in rotating odd-Anuclei

Matsuzaki

2014

Phys. Rev. C

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Background: Collective motions in quantum many-body systems are described as bosonic excitations. Multiphonon excitations in atomic nuclei, however, were observed very rarely. In particular, the first two-phonon γ vibrational (2γ ) excitation in odd-A nuclei was reported in 2006 and only a few have been known so far. Two theoretical calculations for the data on 103 Nb were performed, one of which was done by the present author within a limited model space up to 2γ basis states. Quite recently, conspicuously enhanced B(E2)s, reduced E2 transition probabilities, feeding 2γ states were observed in 105 Nb and conjectured that their parent states, called band (4), are candidates of 3γ states. Purpose: In the present work, the model space is enlarged up to 4γ basis states. The purpose is twofold: One is to see how the description of 2γ eigenstates in the previous work is improved, and the other is to examine the existence of collective 3γ eigenstates, and when they exist, study their collectivity through calculating interband B(E2)s. Method:The particle-vibration coupling model based on the cranking model and the random-phase approximation is used to calculate the vibrational states in rotating odd-A nuclei. Interband B(E2)s are calculated by adopting the method of the generalized intensity relation. Results: The present model reproduces well the energy spectra and B(E2)s of 0γ -2γ states in 103 Nb and 105 Nb. For 3γ states, calculated spectra indicate that the most collective state with the highest K at zero rotation feels strong Coriolis force after rotation sets in and consequently is observed with lowered K, where K is the projection of the angular momentum to the z axis. The calculated states account for the observed enhanced B(E2)s within factors of 2-3. Conclusions:The present calculation with the enlarged model space reproduces the observed 0γ -2γ states well and predicts properties of collective 3γ states. The most collective one is thought to be the main component of the observed band (4) from the analyses of the energy spectra and interband B(E2)s although some mixing with states that are not included in the present model would be possible.

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Section: Introductionmentioning

confidence: 64%

Single-phonon and multi-phonon excitations of theγvibration in rotating odd-Anuclei

Matsuzaki

2014

Phys. Rev. C

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“…Until now, one-phonon γ -vibrational bands (1γ bands) have been found in many mass regions. Two-phonon γ -vibrational bands (2γ bands) have been identified also, such as in 104,105,106 Mo [1][2][3] and 103 Nb [4] in the A = 100 region, and in 154 Gd [5] and 166,168 Er [6,7] in the A = 160 region. For the A = 130-140 region, 1γ bands have been reported in many cases, for example, in 132,134,136 Nd [8][9][10].…”

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confidence: 98%

Multiphononγ-vibrational bands in theγ-soft nucleus138Nd

Zhang

Zhu

et al. 2013

Phys. Rev. C

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The low spin states of 138 Nd have been reinvestigated via the 124 Te( 19 F,4n1p) reaction at a beam energy of 103 MeV. The quasi-one-phonon γ -vibrational band based on the 1013.7 keV level has been expanded and the quasi-two-phonon γ -vibrational band built on the 1842.7 keV level has been proposed. A systematic comparison supports our assignments for multiphonon γ -vibrational bands in 138 Nd. The characteristics of γ softness in 138 Nd have been discussed. Triaxial projected shell model calculations can well describe the rotational feature of the bands, but they fail to reproduce simultaneously the bandhead energies of the two γ -vibrational bands if a fixed triaxial deformation is assumed.

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“…High-spin states in 161 Er have been studied experimentally with three rotational bands built on different configurations extended to higher spins, and signature inversions were discussed [38]. The high-spin states in neutron-rich 103 Nb, 107,109 Tc have been investigated by prompt γ-γ-γ coincident measurement [39,41], observing one-and two-phonon γ-vibrational bands. Particularly, it was the first time to observe two-phonon bands in odd-Z nuclei [39,41].…”

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confidence: 99%

“…The high-spin states in neutron-rich 103 Nb, 107,109 Tc have been investigated by prompt γ-γ-γ coincident measurement [39,41], observing one-and two-phonon γ-vibrational bands. Particularly, it was the first time to observe two-phonon bands in odd-Z nuclei [39,41]. A new rotational band was identified in 188 Au for the first time with an assignment of the πh 9/2 ⊗ νi 13/2 configuration [40].…”

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confidence: 99%

Towards the drip lines of the nuclide landscape

Fang

2012

Chin. Sci. Bull.

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In the paper we review the recent progress of studies in unstable nuclei, mainly affiliated with the facilities of radioactive ion beams in China, including both experimental and theoretical aspects of researches. Many experiments for reactions, decays and structures have been performed targeting better understandings of properties of unstable nuclei. Special experimental measurements related to nuclear astrophysics have been done to seek insights into the processes of syntheses of elements in the universe. Theoretical calculations have provided many useful predictions on the behaviors of unstable nuclei, with model developments. Studies covered many mass regions from light to superheavy nuclei, giving plenty of information about the structures of unstable nuclei, towards the limits of existence of atomic nuclei. unstable nuclei, radioactive ion beams, nuclear astrophysics, experiment, theory Citation: Xu F R. Towards the drip lines of the nuclide landscape.

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Identification of one-phonon and two-phonon γ-vibrational bands in odd-Z 103Nb nucleus

Cited by 19 publications

References 31 publications

Single-phonon and multi-phonon excitations of theγvibration in rotating odd-Anuclei

Single-phonon and multi-phonon excitations of theγvibration in rotating odd-Anuclei

Multiphononγ-vibrational bands in theγ-soft nucleus138Nd

Towards the drip lines of the nuclide landscape

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