Collective clusterization effects in light heavy ion reactions

Gupta, Raj K.; Balasubramaniam, M.; Kumar, Rajesh; Singh, Dalip; Beck, Christian

doi:10.1016/j.nuclphysa.2004.04.091

Cited by 39 publications

(21 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A recent attempt toward dynamically treating the decay of a hot and rotating nucleus has been made by Gupta and collaborators [19][20][21][22][23][24], who propose a dynamical collective clusterization process as a possible alternative of the fission process. Both the LPs and IMFs are considered as the dynamical mass motion of preformed fragments or clusters through the barrier.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24
Gupta
¹
,
Balasubramaniam
²
,
Kumar
³

et al. 2005
Phys. Rev. C
Self Cite
81
6
48
2
View full text Add to dashboard Cite

The dynamical cluster-decay model (DCM) is developed further for the decay of hot and rotating compound nuclei (CN) formed in light heavy-ion reactions. The model is worked out in terms of only one parameter, namely the neck-length parameter, which is related to the total kinetic energy TKE(T ) or effective Q value Q eff (T ) at temperature T of the hot CN and is defined in terms of the CN binding energy and ground-state binding energies of the emitted fragments. The emission of both the light particles (LP), with A 4, Z 2, as well as the complex intermediate mass fragments (IMF), with 4 < A < 20, Z > 2, is considered as the dynamical collective mass motion of preformed clusters through the barrier. Within the same dynamical model treatment, the LPs are shown to have different characteristics compared to those of the IMFs. The systematic variations of the LP emission cross section σ LP and IMF emission cross section σ IMF calculated from the present DCM match exactly the statistical fission model predictions. A nonstatistical dynamical description is developed for the first time for emission of light particles from hot and rotating CN. The model is applied to the decay of 56 Ni * formed in the 32 S + 24 Mg reaction at two incident energies E c.m. = 51.6 and 60.5 MeV. Both the IMFs and average TKE spectra are found to compare resonably well with the experimental data, favoring asymmetric mass distributions. The LPs' emission cross section is shown to depend strongly on the type of emitted particles and their multiplicities.

show abstract

Section: Introductionmentioning

confidence: 99%

“…Interestingly enough, the light particles, though treated within the same dynamical collective clusterization process, are found to possess different characteristic properties. Brief reports of the present work have recently been presented elsewhere [23,24].…”

Section: Introductionmentioning

confidence: 99%

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24
Gupta
¹
,
Balasubramaniam
²
,
Kumar
³

et al. 2005
Phys. Rev. C
Self Cite
81
6
48
2
View full text Add to dashboard Cite

show abstract

“…This method of introducing the necklength parameter R is also used in our dynamical clusterdecay model (DCM) [26][27][28][29][30][31][32][33][34][35][36][37][38] and in the scission-point [39] and saddle-point [40,41] (statistical) fission models for decay of a hot and rotating compound nucleus.…”

Section: The Preformed Cluster Model (Pcm)mentioning

confidence: 99%

“…The ground-state cluster decays of different parent nuclei in the trans-lead region have been observed by many experimental groups around the world, specifically, the clusters 14 C, 18,20 O, 23 F, 22,24,26 Ne, 28,30 Mg, 32 Si, and 34 Si, respectively, from 221−224,226 Ra, 226,228 Th, 231 Pa, 230,232,234 U, 236,238 Pu, 238 Pu, and 242 Cm parents [3,4]. Also, 14 C decay from 221 Fr and 225 Ac, and, more recently 14 C from 223 Ac and 34 Si from 238 U are observed [5].…”

Section: Introductionmentioning

confidence: 98%

Pb208-daughter cluster radioactivity and the deformations and orientations of nuclei

et al. 2009

Self Cite

View full text Add to dashboard Cite

The role of deformations and orientations of nuclei is studied for the first time in cluster decays of various radioactive nuclei, particularly those decaying to doubly closed shell, spherical 208 Pb daughter nucleus. Also, the significance of using the correct Q-value of the decay process is pointed out. The model used is the preformed cluster model (In this model, cluster emission is treated as a tunneling of the confining interaction barrier by a cluster considered already preformed with a relative probability P 0 . Since both the scattering potential and potential energy surface due to the fragmentation process in the ground state of the parent nucleus change significantly with the inclusion of deformation and orientation effects, both the penetrability P and preformation probability P 0 of clusters change accordingly. The calculated decay half-lives for all the cluster decays investigated here are generally in good agreement with measured values for the calculation performed with quadrupole deformations β 2 alone and "optimum" orientations of cold elongated configurations. In some cases, particularly for 14 C decay of Ra nuclei, the inclusion of multipole deformations up to hexadecapole β 4 is found to be essential for a comparison with data. However, the available β 4 -values, particularly for nuclei in the mass region 16 A 26, need be used with caution.

show abstract

“…Apparently, in the above stated formalisms, the emission of light particles (LPs) is calculated within the Hauser-Feshbach method [5]. Alternatively, in the dynamical cluster-decay model [6][7][8][9][10][11][12][13][14], one of us (R.K.G.) and collaborators treated both the LPs and IMFs on an equal footing as the dynamical collective mass motions of preformed clusters through the barrier.…”

Section: Introductionmentioning

confidence: 99%

Decay ofBk246formed in similar entrance channel reactions of
Singh
¹
,
Sharma
²
,
Gupta
³

2008
Phys. Rev. C*
Self Cite

134

View full text Add to dashboard Cite

The decay of the 246 Bk * nucleus, formed in entrance channel reactions 11 B+ 235 U and 14 N+ 232 Th at different incident energies, is studied by using the dynamical cluster-decay model (DCM) extended to include the deformations and orientations of nuclei. The main decay mode here is fission. The other (weaker) decay channels are the light particles evaporation (A 4) and intermediate mass fragments (5 A 20). All decay products are calculated as emissions of preformed clusters through the interaction barriers. The calculated fission cross sections σ fiss , taken as a sum of the energetically favored symmetric and near symmetric fragments (A CN /2 ± 7 and A = 106-110 plus complementary fragments) show an excellent agreement with experimental data at all experimental incident c.m. energies for both reactions, except for the top three energies in the case of the 11 B+ 235 U reaction. The disagreement between the DCM calculations and data at higher incident c.m. energies for the 11 B+ 235 U entrance channel is associated with the presence of additional effects of noncompound, quasifission (qf) components, in contradiction with the measured anisotropy effects which indicate the other entrance channel 14 N+ 232 Th to contain the noncompound nucleus contribution. The prediction of two fission windows, the symmetric fission (SF) and near symmetric or heavy mass fragments (HMFs), suggests the presence of a fine structure of fission fragments, which also need an experimental verification. The only parameter of the model is the neck length parameter R whose value is shown to depend strongly on limiting angular momentum, which in turn depends on the use of sticking or nonsticking moment of inertia for angular momentum effects.

show abstract

Collective clusterization effects in light heavy ion reactions

Cited by 39 publications

References 9 publications

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24
Gupta
¹
,
Balasubramaniam
²
,
Kumar
³

et al. 2005
Phys. Rev. C
Self Cite
81
6
48
2
View full text Add to dashboard Cite

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24
Gupta
¹
,
Balasubramaniam
²
,
Kumar
³

et al. 2005
Phys. Rev. C
Self Cite
81
6
48
2
View full text Add to dashboard Cite

Pb208-daughter cluster radioactivity and the deformations and orientations of nuclei

Decay ofBk246formed in similar entrance channel reactions of
Singh
¹
,
Sharma
²
,
Gupta
³

2008
Phys. Rev. C*
Self Cite

Contact Info

Product

Resources

About

Collective clusterization effects in light heavy ion reactions

Cited by 39 publications

References 9 publications

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24Gupta1, Balasubramaniam2, Kumar3 et al. 2005Phys. Rev. CSelf Cite816482View full textAdd to dashboardCite

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24Gupta1, Balasubramaniam2, Kumar3 et al. 2005Phys. Rev. CSelf Cite816482View full textAdd to dashboardCite

Pb208-daughter cluster radioactivity and the deformations and orientations of nuclei

Decay ofBk246*formed in similar entrance channel reactions ofSingh1, Sharma2, Gupta3 2008Phys. Rev. CSelf Cite

Contact Info

Product

Resources

About

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24
Gupta
¹
,
Balasubramaniam
²
,
Kumar
³

et al. 2005
Phys. Rev. C
Self Cite
81
6
48
2
View full text Add to dashboard Cite

Dynamical cluster-decay model for hot and rotating light-mass nuclear systems applied to the low-energyS32+Mg24
Gupta
¹
,
Balasubramaniam
²
,
Kumar
³

et al. 2005
Phys. Rev. C
Self Cite
81
6
48
2
View full text Add to dashboard Cite

Decay ofBk246formed in similar entrance channel reactions of
Singh
¹
,
Sharma
²
,
Gupta
³

2008
Phys. Rev. C*
Self Cite