Hybrid recoil mass analyzer at IUAC — First results using gas-filled mode and future plans

Madhavan, N.; Nath, S.; Varughese, T.; Gehlot, J.; Jhingan, A.; Sugathan, P.; Sinha, A. K.; Singh, Raghuvir; Varier, K. M.; Radhakrishna, M. C.; Prasad, E.; Kalkal, Sunil; Mohanto, G.; Das, J. J.; Kumar, R.; Singh, R. P.; Muralithar, S.; Bhowmik, R. K.; Roy, A.; Kumar, Rajesh; Suman, Saket; Mandal, A.; Datta, T. K.; Chacko, J.; Choudhury, Anup; Naik, Umesh; Malyadri, A J; Archunan, M.; Zacharias, Jerrold R.; Rao, S. Venugopal; Kumar, Mukesh; Barua, P.; Subramanian, E. T.; Rani, K. J.; Kumar, Bharat; Golda, K. S.

doi:10.1007/s12043-010-0119-3

Cited by 37 publications

(19 citation statements)

References 14 publications

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“…The recoil mass separator, HYRA (HYbrid Recoil mass Analyzer) [26,27] was used for the separation and identification of the ERs from the intense beam background. HYRA is a dual mode, dual stage mass separator, with its first stage can be operated in gas-filled mode or vacuum mode.…”

Section: Experimental Methods and Resultsmentioning

confidence: 99%

Probing Quasifission In Reactions Forming Rn Nucleus

Shamlath¹,

Prasad²,

Madhavan³

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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We studied the competition between fusion and quasifission by populating the compound nucleus (CN) 210 Rn through different entrance channels - 16 O+ 194 Pt and 30 Si+ 180 Hf, at energies around the Coulomb barrier. The larger widths of the fission fragment mass distribution in the 30 Si+ 180 Hf reaction which could not be explained by using transition state models, indicated the onset of quasifission in this reaction. Further, the evaporation residues (ERs) produced in these reactions were measured using the gas-filled recoil mass separator HYRA at IUAC. The measurements showed reduced ER cross sections for the 30 Si+ 180 Hf reaction when compared with that of 16 O+ 194 Pt at similar excitation energies, confirming the presence of quasifission in the 30 Si+ 180 Hf reaction. The experimental results are analysed using the dinuclear system (DNS) and statistical models to understand the possible influence of potential energy surfaces (PES) and different entrance channel conditions in heavy ion fusion reactions.

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Section: Experimental Methods and Resultsmentioning

confidence: 99%

Probing Quasifission In Reactions Forming Rn Nucleus

Shamlath¹,

Prasad²,

Madhavan³

et al. 2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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“…Pulsed 19 F, 16 O and 18 O beams with a pulse separation of 4 µs (as ERs, produced at the target chamber, took about 3.5 to 4 µs to reach the focal plane, covering a distance of ~ 7.6 m.) was used in the experiment to bombard isotopically enriched 194 18 O beam respectively. The heavy ERs produced in the reaction were separated from the intense beam background by the gas-filled HYRA spectrometer [4]. It is a dual-mode, dual-stage recoil mass separator and spectrometer.…”

Section: Methodsmentioning

confidence: 99%

Recent results of measurements of evaporation residue excitation functions for¹⁹F+^194,196,198Pt and^16,18O+¹⁹⁸Pt systems with HYRA spectrometer at IUAC

Behera

2015

EPJ Web of Conferences

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Abstract. In this talk results of the evaporation residue (ER) cross sections for the 19 F+ 194,196,198 Pt (forming compound nuclei 213,215,217 Fr) and 16,18 O+ 198 Pt (forming compound nuclei 214,216 Rn) systems measured at Hybrid Recoil mass Analyzer (HYRA) spectrometer installed at the Pelletron+LINAC accelerator facility of the Inter University Accelerator Center (IUAC), New Delhi are reported. The survival probabilities of 215 Fr and 217 Fr with neutron numbers N = 126 are found to be lower than the survival probabilities of 215 Fr and 217 Fr with neutron numbers N = 128 and 130 respectively. Statistical model analysis of the ER cross sections show that an excitation energy dependent scaling factor of the finite-range rotating liquid drop model fission barrier is necessary to fit the experimental data. For the case of 214,216 Rn, the experimental ER cross sections are compared with the predictions from the statistical model calculations of compound nuclear decay where Kramer's fission width is used. The strength of nuclear dissipation is treated as a free parameter in the calculations to fit the experimental data.

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“…3. The HYbrid Recoil mass Analyser (HYRA) [4] will be combined with INGA in future for carrying out evaporation residue gated nuclear structure studies. …”

Section: Facilitymentioning

confidence: 99%