Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons

Jian Tian; Wei Ye

doi:10.1088/1674-1137/40/9/094103

Chinese Physics C> 2016, Vol. 40> Issue(9) : 094103 DOI: 10.1088/1674-1137/40/9/094103

Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons

Jian Tian ,
Wei Ye ^,

1.
Department of Physics, Southeast University, Nanjing 210096, China

Abstract
HTML
Reference
Related

PDF

Abstract：
Using the stochastic Langevin model coupled with a statistical decay model, we study the influence of pre-equilibrium (PE) emission on probing postsaddle friction (β) with neutrons. A postsaddle friction value of (14-16.5)×10²¹ s^-1 and (11-13)×10²¹ s^-1 is obtained from comparing calculated and measured prescission neutron multiplicities of heavy fissioning systems ²⁴⁸Fm and ²⁵⁶Fm in the absence and presence of the deformation factor. Moreover, it is found that a larger β is required to fit multiplicity data after the PE effect is accounted for, and that the effect becomes stronger when more energy is removed by PE particles. Our findings suggest that, to more accurately determine the postsaddle friction strength through the measurement of prescission neutrons, in addition to incorporating the contribution of PE evaporation source into the experimental multi-source analysis for particle energy spectra in coincidence with fission fragments, on the theoretical side, it is very important to make a precise evaluation of the energy that PE emission carries away from excited compound systems produced in heavy-ion fusion reactions.
- nuclear dissipation ,
- Langevin model ,
- pre-equilibrium emission ,
- neutron

References

[1]	W. Q. Shen et al, Phys. Rev. C, 36:115(1987)
[2]	J. Velkovska et al, Phys. Rev. C, 59:1506(1999)
[3]	E. Williams et al, Phys. Rev. C, 88:034611(2013)
[4]	D. Jacquet, M. Morjean, Prog. Part. Nucl. Phys., 63:155(2009)
[5]	J. U. Andersen et al, Phys. Rev. C, 78:064609(2008)
[6]	P. Paul, M. Thoennessen, Annu. Rev. Nucl. Part. Sci., 44:65(1994)
[7]	J. Benlliure et al, Phys. Rev. C, 74:014609(2006)
[8]	H. Singh et al, Phys. Rev. C, 78:024609(2008)
[9]	R. Sandal et al, Phys. Rev. C, 87:014604(2013)
[10]	J. Sadhukhan et al, Phys. Rev. C, 79:064606(2009)
[11]	W. Ye, Phys. Rev. C, 84:034617(2011)
[12]	V. Singh et al, Phys. Rev. C, 87:064601(2013)
[13]	Y. Ayyad et al, Phys. Rev. C, 89:054610(2014)
[14]	P. Grange, J. Q. Li, H. A. Weidenmuller, Phys. Rev. C, 27:2063(1983)
[15]	P. Frbrich et al, Nucl. Phys. A, 556:281(1993)
[16]	Y. Abe et al, Phys. Rep., 275:49(1996)
[17]	K. Pomorski et al, Nucl. Phys. A, 679:25(2000)
[18]	W. Ye, Phys. Lett. B, 681:413(2009); Phys. Rev. C, 81:054609(2010)
[19]	W. Ye et al, Phys. Rev. C, 91:064603(2015); ibid., 90:041604(R) (2014)
[20]	A. V. Karpov et al, Phys. Rev. C, 63:054610(2001)
[21]	J. Sadhukhan et al, Phys. Rev. C, 84:044610(2011)
[22]	H. J. Krappe, K. Pomorski, Theory of Nuclear Fission, Lectcure Notes in Physics, (Springer, Berlin), 838 (2012)
[23]	H. Eslamizadeh et al, Chin. Phys. C,38:064101(2014); Eur. Phys. J. A, 47:134(2011)
[24]	Y. Z. Xing, Chin. Phys. C, 33:269(2009)
[25]	B. B. Back et al, Phys. Rev. C, 60:044602(1999)
[26]	S. K. Hui et al, Phys. Rev. C, 62:054604(2000)
[27]	G. Chaudhuri, S Pal, Eur. Phys. J. A, 14:287(2002)
[28]	B. Jurado et al, Phys. Rev. Lett., 93:072501(2004)
[29]	C. Schmitt et al, Phys. Rev. Lett., 99:042701(2007)
[30]	W. Ye et al, Phys. Rev. C, 77:011302(R) (2008)
[31]	W. Ye et al, Phys. Rev. C, 87:041610(2013)
[32]	Y. Ayyad et al, Phys. Rev. C, 91:034601(2015)
[33]	P. Frbrich, I.I.Gontchar, Phys. Rep., 292:131(1998)
[34]	V. A. Rubchenya et al, Phys. Rev. C, 58:1587(1998)
[35]	K. Ramachandran et al, Phys. Rev. C, 73:064609(2006)
[36]	D. Hilscher, H. Rossner, Ann. Phys. (Paris), 17:471(1992)
[37]	J. Acharya et al, Phys. Rev. C, 93:024608(2016)
[38]	A. Saxena et al, Phys. Rev. C, 49:932(1994)
[39]	Z. H. Liu et al, Phys. Rev. C, 89:024604(2014)
[40]	Sh. A. Kalandarov, D. Lacroix, G. G. Adamian, N. V. Antonenko, J. P. Wieleczko, S. Pirrone, G. Politi, Phys. Rev. C, 93:024613(2016)
[41]	P. Frbrich, Nucl. Phys. A, 787:170c (2007)
[42]	H. J. Krappe et al, Phys. Rev. C, 20:992(1979); A. J. Sierk, ibid., 33:2039(1986)
[43]	A. V. Ignatyuk et al, Sov. J. Nucl. Phys. 21:612(1975)
[44]	I. I. Gontchar et al, Phys. Rev. C 47, 2228(1993).
[45]	M. Blann, Phys. Rev. C, 21:1770(1980)
[46]	D. J. Hinde et al, Phys. Rev. C, 45:1229(1992)
[47]	E. G. Ryabov et al, Phys. Rev. C, 78:044614(2008)
[48]	C. Schmitt et al, Phys. Rev. C, 81:064602(2010)
[49]	E. Holub et al, Phys. Rev. C, 33:143(1986)
[50]	M. Blann, Phys. Rev. C, 23:205(1981).
[51]	W. Ye et al, HEP NP, 21:348(1997) (in Chinese); H. Feldmeier, Rep. Prog. Phys., 50:915(1987)
[52]	K. Siwek-Wilczyńska et al, Phys. Rev. C, 51:2054(1995)
[53]	M. Blann, Phys. Rev. C, 54:1341(1996)
[54]	J. P. Lestone, Phys. Rev. Lett., 70:2245(1993)
[55]	W. Ye, Commun. Theor. Phys. (Beijing, China), 40:477(2003)
[56]	P. Mller et al, At. Data Nucl. Data Tables, 39:225(1988)
[57]	K. Pomorski et al, Nucl. Phys. A, 605:87(1996)
[58]	J. P. Lestone, S. G. McCalla, Phys. Rev. C, 79:044611(2009)
[59]	N. P. Shaw et al, Phys. Rev. C, 61:044612(2000); I. Diszegi et al, ibid., 61:024613(2000)
[60]	V. P. Aleshin, Nucl. Phys. A, 781:363(2007)
[61]	W. Ye, J. Tian, Phys. Rev. C, 93:044603(2016)
[62]	G. Chauduri, S. Pal, Phys. Rev. C, 63:064603(2001)
[63]	G. G. Adamian, N. Antonenko, W. Scheid, Clustering Effects Within the Dinuclear Model, Lectcure Notes in Physics, edited by C. Beck (Springer, Berlin 2012), 848, p. 165
[64]	G. Chaudhuri et al, Phys. Rev. C, 65:054612(2002)
[65]	P. N. Nadtochy et al, Phys. Rev. C, 89:014616(2014)
[66]	E. Vardaci et al, Phys. Rev. C, 92:034610(2015)

[1]	Divya Arora , P. Sugathan , A. Chatterjee . Investigating the fission dynamics of the following neutron shell closed nuclei within a stochastic dynamical approach: ²¹⁰Po, ²¹²Rn, and ²¹³Fr. Chinese Physics C, 2023, 47(3): 034003. doi: 10.1088/1674-1137/aca7e2
[2]	D. Naderi , M. Salimi . Investigation of fission fragments average spin based on four dimensional Langevin dynamical model. Chinese Physics C, 2017, 41(2): 024104. doi: 10.1088/1674-1137/41/2/024104
[3]	H. Eslamizadeh , F. Bagheri . Simulation of the fission dynamics of the excited compound nuclei ²⁰⁶Po and ¹⁶⁸Yb produced in the reactions ¹²C+¹⁹⁴Pt and ¹⁸O+¹⁵⁰Sm. Chinese Physics C, 2017, 41(4): 044101. doi: 10.1088/1674-1137/41/4/044101
[4]	Ming-Zhe Liu , Bing-Qi Liu , Zhuo Zuo , Lei Wang , Gui-Bin Zan , Xian-Guo Tuo . Toward a fractal spectrum approach for neutron and gamma pulse shape discrimination. Chinese Physics C, 2016, 40(6): 066201. doi: 10.1088/1674-1137/40/6/066201
[5]	SUN Xiao-Jun , YU Cheng-Gang , WANG Ning , YANG Yong-Xu , PAN Cheng-Hua . Pre-neutron-emission mass distributions for reaction²³⁸U(n, f) up to 60 MeV. Chinese Physics C, 2015, 39(1): 014102. doi: 10.1088/1674-1137/39/1/014102
[6]	CHEN Guo-Chang , CAO Wen-Tian , YU Bao-Sheng , TANG Guo-You , SHI Zhao-Min , TAO Xi . Neutron nuclear data evaluation of actinide nuclei for CENDL-3.1. Chinese Physics C, 2012, 36(9): 823-826. doi: 10.1088/1674-1137/36/9/005
[7]	LIU Min , LI Zhu-Xia , WANG Ning , ZHANG Feng-Shou . Exploring nuclear symmetry energy with isospin dependence in neutron skin thickness of nuclei. Chinese Physics C, 2011, 35(7): 629-634. doi: 10.1088/1674-1137/35/7/006
[8]	YE Wei . Surveying post-saddle nuclear dissipation with protons and α particles as probes. Chinese Physics C, 2010, 34(1): 45-48. doi: 10.1088/1674-1137/34/1/008
[9]	WU Feng , YE Wei . System size effects on probing nuclear dissipation with neutrons. Chinese Physics C, 2010, 34(5): 551-554. doi: 10.1088/1674-1137/34/5/007
[10]	YE Wei . Surveying the role of excitation energy in probing nuclear dissipation. Chinese Physics C, 2009, 33(7): 528-531. doi: 10.1088/1674-1137/33/7/005
[11]	CHU Yan-Yun , CHEN Shuang , REN Zhong-Zhou . Three-body model for neutron-halo nuclei. Chinese Physics C, 2008, 32(12): 972-975. doi: 10.1088/1674-1137/32/12/006
[12]	YE Wei , WU Feng . Influence of angular momentum on evaporation residue cross section as a probe of nuclear dissipation. Chinese Physics C, 2008, 32(6): 433-436. doi: 10.1088/1674-1137/32/6/004
[13]	YE Wei , WU Feng , YANG Hong-Wei . Langevin study of neutron emission in the reactions ¹⁶O+¹⁸¹Ta and ¹⁹F+¹⁷⁸Hf. Chinese Physics C, 2008, 32(10): 816-819. doi: 10.1088/1674-1137/32/10/010
[14]	Chen Liewen , Zhang Xiaodong , Ge Lingxiao . Isospin Effects on Pre-Equilibrium Nucleon Emission in Heavy-Ion Collisions. Chinese Physics C, 1997, 21(S1): 465-470.
[15]	Zhang Changhua , Gu Jinnan . Shell Model Calculation for Light Neutron-Rich Nuclei. Chinese Physics C, 1996, 20(S2): 165-170.
[16]	Hu Jimin , An Yu . Nuclear Macro-Microscopic Model. Chinese Physics C, 1992, 16(S3): 339-342.
[17]	MIAO Rong-Zhi . A STUDY OF PRE-EQUILIBRIUM EMISSION INVOLVING COMPLEX PROJECTILE AND EMITTED PARTICLE IN MEMORY MODEL. Chinese Physics C, 1989, 13(11): 1039-1048.
[18]	MIAO Rong-Zhi . A MEMORY PARTICLE MODEL IN STUDY OF PRE-EQUILIBRIUM EMISSION. Chinese Physics C, 1989, 13(10): 942-955.
[19]	MIAO Rong-Zhi , WU Guo-Hua . A STUDY OF COMPLEX PARTICLE EMISSION IN THE PRE-EQUILIBRIUM STATISTICAL MODEL. Chinese Physics C, 1986, 10(1): 82-91.
[20]	MIAO Rong-Zhi , WU Guo-Hua , ZHENG Wei-Han , LIU Jian-Ye , YU Chao-Fan , YU Xie . A MODIFICATION FOR COMPLEX-PARTICLE EMISSION PROBABILITY IN THE PRE-EQUILIBRIUM EXCITON MODEL. Chinese Physics C, 1985, 9(1): 95-100.

Access

Get Citation

Jian Tian and Wei Ye. Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons[J]. Chinese Physics C, 2016, 40(9): 094103. doi: 10.1088/1674-1137/40/9/094103

Jian Tian and Wei Ye. Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons[J]. Chinese Physics C, 2016, 40(9): 094103. doi: 10.1088/1674-1137/40/9/094103 shu

RIS(for EndNote,Reference Manager,ProCite)

BibTex

Txt

Milestone

Received: 2016-04-12

Fund

Supported by National Nature Science Foundation of China (11575044)

Article Metric

Article Views(1871)
PDF Downloads(138)
Cited by(0)

Policy on re-use

To reuse of subscription content published by CPC, the users need to request permission from CPC, unless the content was published under an Open Access license which automatically permits that type of reuse.

通讯作者: 陈斌, [email protected]

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons

Abstract：

References

Access

Article Metrics

Metrics

通讯作者: 陈斌, [email protected]

Email This Article

Effect of pre-equilibrium emission on probing postsaddle nuclear dissipation with neutrons

Corresponding author: Wei Ye,

HTML

目录