Study of the Jacobi shape transition in A≈30 nuclei

Balaram Dey; C. Ghosh; Deepak Pandit; A. K. Rhine Kumar; S. Pal; V. Nanal; R. G. Pillay; P. Arumugam; S. De; G. Gupta; H. Krishnamoorthy; E. T. Mirgule; Surajit Pal; P. C. Rout

doi:10.1103/PhysRevC.97.014317

Study of the Jacobi shape transition in A≈30 nuclei

Balaram Dey, C. Ghosh, Deepak Pandit, A. K. Rhine Kumar, S. Pal, V. Nanal, R. G. Pillay, P. Arumugam, S. De, G. Gupta, H. Krishnamoorthy, E. T. Mirgule, Surajit Pal, P. C. Rout

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10 Scopus citations

Abstract

This paper reports the first observation of the Jacobi shape transition in P31 using high energy γ rays from the decay of giant dipole resonance (GDR) as a probe. The measured GDR spectrum in the decay of P31 shows a distinct low energy component around 10 MeV, which is a clear signature of Coriolis splitting in a highly deformed rotating nucleus. Interestingly, a self-conjugate α-cluster nucleus Si28, populated at similar initial excitation energy and angular momentum, exhibits a vastly different GDR lineshape. Even though the angular momentum of the compound nucleus Si28 is higher than the critical angular momentum required for the Jacobi shape transition, the GDR lineshape is akin to a prolate deformed nucleus. Considering the present results for Si28 and similar observation recently reported in S32, it is proposed that the nuclear orbiting phenomenon exhibited by α-cluster nuclei hinders the Jacobi shape transition. The present experimental results suggest a possibility to investigate the nuclear orbiting phenomenon using high energy γ rays as a probe.

Original language	English
Article number	014317
Journal	Physical Review C
Volume	97
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.97.014317
State	Published - Jan 24 2018
Externally published	Yes

Funding

We would like to thank M. S. Pose, K. V. Divekar, M. E. Sawant, A. Quadir, R. Kujur for help with experimental setup, R. D. Turbhekar for target preparation, and the PLF staff for the smooth operation of the accelerator. A.K.R.K. acknowledges the financial support provided by the Department of Science and Technology, India, via the DST-INSPIRE Faculty award and the numerical calculations were carried out using RIKEN Supercomputer HOKUSAI-GreatWave System. P.A. acknowledges financial support from the SERB (India), DST/INT/POL/P-09/2014.

Funders	Funder number
DST-INSPIRE
Department of Science and Technology, Ministry of Science and Technology, India
Science and Engineering Research Board	DST/INT/POL/P-09/2014

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10.1103/PhysRevC.97.014317

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title = "Study of the Jacobi shape transition in A≈30 nuclei",

abstract = "This paper reports the first observation of the Jacobi shape transition in P31 using high energy γ rays from the decay of giant dipole resonance (GDR) as a probe. The measured GDR spectrum in the decay of P31 shows a distinct low energy component around 10 MeV, which is a clear signature of Coriolis splitting in a highly deformed rotating nucleus. Interestingly, a self-conjugate α-cluster nucleus Si28, populated at similar initial excitation energy and angular momentum, exhibits a vastly different GDR lineshape. Even though the angular momentum of the compound nucleus Si28 is higher than the critical angular momentum required for the Jacobi shape transition, the GDR lineshape is akin to a prolate deformed nucleus. Considering the present results for Si28 and similar observation recently reported in S32, it is proposed that the nuclear orbiting phenomenon exhibited by α-cluster nuclei hinders the Jacobi shape transition. The present experimental results suggest a possibility to investigate the nuclear orbiting phenomenon using high energy γ rays as a probe.",

author = "Balaram Dey and C. Ghosh and Deepak Pandit and {Rhine Kumar}, {A. K.} and S. Pal and V. Nanal and Pillay, {R. G.} and P. Arumugam and S. De and G. Gupta and H. Krishnamoorthy and Mirgule, {E. T.} and Surajit Pal and Rout, {P. C.}",

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doi = "10.1103/PhysRevC.97.014317",

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AU - Dey, Balaram

AU - Ghosh, C.

AU - Pandit, Deepak

AU - Rhine Kumar, A. K.

AU - Pal, S.

AU - Nanal, V.

AU - Pillay, R. G.

AU - Arumugam, P.

AU - De, S.

AU - Gupta, G.

AU - Krishnamoorthy, H.

AU - Mirgule, E. T.

AU - Pal, Surajit

AU - Rout, P. C.

PY - 2018/1/24

Y1 - 2018/1/24

N2 - This paper reports the first observation of the Jacobi shape transition in P31 using high energy γ rays from the decay of giant dipole resonance (GDR) as a probe. The measured GDR spectrum in the decay of P31 shows a distinct low energy component around 10 MeV, which is a clear signature of Coriolis splitting in a highly deformed rotating nucleus. Interestingly, a self-conjugate α-cluster nucleus Si28, populated at similar initial excitation energy and angular momentum, exhibits a vastly different GDR lineshape. Even though the angular momentum of the compound nucleus Si28 is higher than the critical angular momentum required for the Jacobi shape transition, the GDR lineshape is akin to a prolate deformed nucleus. Considering the present results for Si28 and similar observation recently reported in S32, it is proposed that the nuclear orbiting phenomenon exhibited by α-cluster nuclei hinders the Jacobi shape transition. The present experimental results suggest a possibility to investigate the nuclear orbiting phenomenon using high energy γ rays as a probe.

AB - This paper reports the first observation of the Jacobi shape transition in P31 using high energy γ rays from the decay of giant dipole resonance (GDR) as a probe. The measured GDR spectrum in the decay of P31 shows a distinct low energy component around 10 MeV, which is a clear signature of Coriolis splitting in a highly deformed rotating nucleus. Interestingly, a self-conjugate α-cluster nucleus Si28, populated at similar initial excitation energy and angular momentum, exhibits a vastly different GDR lineshape. Even though the angular momentum of the compound nucleus Si28 is higher than the critical angular momentum required for the Jacobi shape transition, the GDR lineshape is akin to a prolate deformed nucleus. Considering the present results for Si28 and similar observation recently reported in S32, it is proposed that the nuclear orbiting phenomenon exhibited by α-cluster nuclei hinders the Jacobi shape transition. The present experimental results suggest a possibility to investigate the nuclear orbiting phenomenon using high energy γ rays as a probe.

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JO - Physical Review C

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Study of the Jacobi shape transition in A≈30 nuclei

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