Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of 208Rn

Neeraj Kumar; Shashi Verma; Shabnam Mohsina; Jhilam Sadhukhan; K. Rojeeta Devi; A. Banerjee; N. Saneesh; M. Kumar; Ruchi Mahajan; Meenu Thakur; Gurpreet Kaur; Anjali Rani; Neelam; Abhishek Yadav; Kavita; Rakesh Kumar; Unnati; S. Mandal; Suresh Kumar; B. R. Behera; K. S. Golda; A. Jhingan; P. Sugathan

doi:10.1016/j.physletb.2021.136062

Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of ²⁰⁸Rn

Neeraj Kumar, Shashi Verma, Shabnam Mohsina, Jhilam Sadhukhan, K. Rojeeta Devi, A. Banerjee, N. Saneesh, M. Kumar, Ruchi Mahajan, Meenu Thakur, Gurpreet Kaur, Anjali Rani, Neelam, Abhishek Yadav, Kavita, Rakesh Kumar, Unnati, S. Mandal, Suresh Kumar, B. R. BeheraK. S. Golda, A. Jhingan, P. Sugathan

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

The pre- and post-scission neutron multiplicities are measured for the fission of ²⁰⁸Rn, populated with the reactions ³⁰Si+¹⁷⁸Hf and ⁴⁸Ti+¹⁶⁰Gd in the excitation energy range of 54.5 - 80.8 MeV. We found significant differences in the pre-scission neutron multiplicities of these two systems. Also, both the reactions exhibit an enhancement in the pre-scission multiplicity with respect to the existing data for the ¹⁶O+¹⁹⁴Pt reaction populating ²¹⁰Rn. The measured multiplicities are compared with the theoretical predictions obtained from the Langevin dynamical model for fission. Dynamical simulations are also performed to estimate the capture cross-sections. Contribution of the neutrons, emitted during the fusion process, is shown to be crucial in determining the neutron multiplicities for the present systems. Moreover, in case of the ⁴⁸Ti+¹⁶⁰Gd reaction, rapid quasi-fission dynamics prevents neutron emission from the thermalized target-projectile composite. The present measurement helps us to understand the relative importance of fusion and quasi-fission processes and their timescales depending on the entrance channel mass asymmetry.

Original language	English
Article number	136062
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	814
DOIs	https://doi.org/10.1016/j.physletb.2021.136062
State	Published - 10 Mar 2021
Externally published	Yes

Bibliographical note

Publisher Copyright:
© 2021 The Author(s)

Funding

Authors acknowledge the Pelletron group and Target Laboratory of IUAC for their support during the experiments. One of the authors (N.K.), acknowledges the financial assistance provided by CSIR and IUAC , in the form of Senior Research Fellowship [ 09/045(1567)/2018-EMR-I ] and Project Fellowship ( UFR-52305 ), respectively. S.V. acknowledges the support of the University of Delhi in the form of R&D Grant.

Funders	Funder number
Council of Scientific and Industrial Research, India
University of Delhi
Inter-University Accelerator Centre	09/045(1567)/2018-EMR-I, UFR-52305

Keywords

Dynamical model calculations
Neutron multiplicity
Nuclear fission dynamics

Access to Document

10.1016/j.physletb.2021.136062

Cite this

Kumar, N., Verma, S., Mohsina, S., Sadhukhan, J., Rojeeta Devi, K., Banerjee, A., Saneesh, N., Kumar, M., Mahajan, R., Thakur, M., Kaur, G., Rani, A., Neelam, Yadav, A., Kavita, Kumar, R., Unnati, Mandal, S., Kumar, S., ... Sugathan, P. (2021). Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of ²⁰⁸Rn. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 814, Article 136062. https://doi.org/10.1016/j.physletb.2021.136062

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title = "Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of 208Rn",

abstract = "The pre- and post-scission neutron multiplicities are measured for the fission of 208Rn, populated with the reactions 30Si+178Hf and 48Ti+160Gd in the excitation energy range of 54.5 - 80.8 MeV. We found significant differences in the pre-scission neutron multiplicities of these two systems. Also, both the reactions exhibit an enhancement in the pre-scission multiplicity with respect to the existing data for the 16O+194Pt reaction populating 210Rn. The measured multiplicities are compared with the theoretical predictions obtained from the Langevin dynamical model for fission. Dynamical simulations are also performed to estimate the capture cross-sections. Contribution of the neutrons, emitted during the fusion process, is shown to be crucial in determining the neutron multiplicities for the present systems. Moreover, in case of the 48Ti+160Gd reaction, rapid quasi-fission dynamics prevents neutron emission from the thermalized target-projectile composite. The present measurement helps us to understand the relative importance of fusion and quasi-fission processes and their timescales depending on the entrance channel mass asymmetry.",

keywords = "Dynamical model calculations, Neutron multiplicity, Nuclear fission dynamics",

author = "Neeraj Kumar and Shashi Verma and Shabnam Mohsina and Jhilam Sadhukhan and {Rojeeta Devi}, K. and A. Banerjee and N. Saneesh and M. Kumar and Ruchi Mahajan and Meenu Thakur and Gurpreet Kaur and Anjali Rani and Neelam and Abhishek Yadav and Kavita and Rakesh Kumar and Unnati and S. Mandal and Suresh Kumar and Behera, {B. R.} and Golda, {K. S.} and A. Jhingan and P. Sugathan",

note = "Publisher Copyright: {\textcopyright} 2021 The Author(s)",

year = "2021",

month = mar,

day = "10",

doi = "10.1016/j.physletb.2021.136062",

language = "אנגלית",

volume = "814",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

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Kumar, N, Verma, S, Mohsina, S, Sadhukhan, J, Rojeeta Devi, K, Banerjee, A, Saneesh, N, Kumar, M, Mahajan, R, Thakur, M, Kaur, G, Rani, A, Neelam, Yadav, A, Kavita, Kumar, R, Unnati, Mandal, S, Kumar, S, Behera, BR, Golda, KS, Jhingan, A & Sugathan, P 2021, 'Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of ²⁰⁸Rn', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 814, 136062. https://doi.org/10.1016/j.physletb.2021.136062

TY - JOUR

T1 - Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of 208Rn

AU - Kumar, Neeraj

AU - Verma, Shashi

AU - Mohsina, Shabnam

AU - Sadhukhan, Jhilam

AU - Rojeeta Devi, K.

AU - Banerjee, A.

AU - Saneesh, N.

AU - Kumar, M.

AU - Mahajan, Ruchi

AU - Thakur, Meenu

AU - Kaur, Gurpreet

AU - Rani, Anjali

AU - Neelam,

AU - Yadav, Abhishek

AU - Kavita,

AU - Kumar, Rakesh

AU - Unnati,

AU - Mandal, S.

AU - Kumar, Suresh

AU - Behera, B. R.

AU - Golda, K. S.

AU - Jhingan, A.

AU - Sugathan, P.

PY - 2021/3/10

Y1 - 2021/3/10

N2 - The pre- and post-scission neutron multiplicities are measured for the fission of 208Rn, populated with the reactions 30Si+178Hf and 48Ti+160Gd in the excitation energy range of 54.5 - 80.8 MeV. We found significant differences in the pre-scission neutron multiplicities of these two systems. Also, both the reactions exhibit an enhancement in the pre-scission multiplicity with respect to the existing data for the 16O+194Pt reaction populating 210Rn. The measured multiplicities are compared with the theoretical predictions obtained from the Langevin dynamical model for fission. Dynamical simulations are also performed to estimate the capture cross-sections. Contribution of the neutrons, emitted during the fusion process, is shown to be crucial in determining the neutron multiplicities for the present systems. Moreover, in case of the 48Ti+160Gd reaction, rapid quasi-fission dynamics prevents neutron emission from the thermalized target-projectile composite. The present measurement helps us to understand the relative importance of fusion and quasi-fission processes and their timescales depending on the entrance channel mass asymmetry.

AB - The pre- and post-scission neutron multiplicities are measured for the fission of 208Rn, populated with the reactions 30Si+178Hf and 48Ti+160Gd in the excitation energy range of 54.5 - 80.8 MeV. We found significant differences in the pre-scission neutron multiplicities of these two systems. Also, both the reactions exhibit an enhancement in the pre-scission multiplicity with respect to the existing data for the 16O+194Pt reaction populating 210Rn. The measured multiplicities are compared with the theoretical predictions obtained from the Langevin dynamical model for fission. Dynamical simulations are also performed to estimate the capture cross-sections. Contribution of the neutrons, emitted during the fusion process, is shown to be crucial in determining the neutron multiplicities for the present systems. Moreover, in case of the 48Ti+160Gd reaction, rapid quasi-fission dynamics prevents neutron emission from the thermalized target-projectile composite. The present measurement helps us to understand the relative importance of fusion and quasi-fission processes and their timescales depending on the entrance channel mass asymmetry.

KW - Dynamical model calculations

KW - Neutron multiplicity

KW - Nuclear fission dynamics

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U2 - 10.1016/j.physletb.2021.136062

DO - 10.1016/j.physletb.2021.136062

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AN - SCOPUS:85099395182

SN - 0370-2693

VL - 814

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

M1 - 136062

ER -