ENTRY A0684 20210315 A097A068400000001 SUBENT A0684001 20210315 A097A068400100001 BIB 13 64 A068400100002 TITLE Anomalous increase in width of fission fragment mass A068400100003 distribution in 19F + 232Th A068400100004 REFERENCE (J,PR/C,69,031603,2004) A068400100005 AUTHOR (T.K.Ghosh, S.Pal, T.Sinha, N.Majumdar, A068400100006 S.Chattopadhyay, P.Bhattacharya, A.Saxena, P.K.Sahu, A068400100007 K.S.Golda, S.K.Datta) A068400100008 INSTITUTE (3INDSAH,3INDTRM,3INDNSD) A068400100009 FACILITY (VDGT,3INDNSD) The 15UD Pelletron at the Nuclear A068400100010 Science Centre A068400100011 SAMPLE The target was a self-supporting 1.8 mg/cm2 foil of A068400100012 232Th. The average center of mass energies cited A068400100013 include correction for energy loss in the target. The A068400100014 target was placed at an angle 30 degree to the beam. A068400100015 DETECTOR (MWPC) Fission fragments were detected with two large A068400100016 area X-Y position sensitive multiwire proportional A068400100017 counters. These detectors provide good timing and A068400100018 position resolution and can discriminate the fission A068400100019 fragments from beamlike particles. A068400100020 (SOLST) Two solid state detectors were placed at ~10 A068400100021 degree with respect to the beam to detect elastically A068400100022 scattered 19F particles to monitor beam intensity and A068400100023 positioning of beam on target. One of the solid-state A068400100024 detectors was also used for monitoring of the time A068400100025 structure of the beam. A068400100026 (SCIN) Time structure of the beam was also monitored A068400100027 intermittently by measuring the width of pulse with a A068400100028 fast plastic scintillator. A068400100029 MONITOR (90-TH-232(9-F-19,EL)90-TH-232,,DA) A068400100030 METHOD (EXTB) The experiment was carried out using pulsed 19F A068400100031 beam. The pulse width was about 1.5 ns with a pulse A068400100032 separation of 250 ns. A068400100033 ADD-RES Mass variance and anisotropy, as a function of Ecm. A068400100034 Ecm (MeV) variance error A068400100035 97.5 574.56 13.42 A068400100036 95.7 484.88 12.11 A068400100037 93.8 443.52 11.58 A068400100038 91.8 398.00 10.77 A068400100039 89.9 377.91 10.88 A068400100040 89.0 372.87 10.62 A068400100041 88.0 380.64 10.73 A068400100042 87.1 429.73 12.23 A068400100043 85.2 538.70 16.24 A068400100044 83.4 543.82 17.72 A068400100045 81.5 556.01 20.98 A068400100046 79.7 553.66 18.82 A068400100047 77.8 529.92 23.01 A068400100048 COMMENT - By authors. The sudden and large increase in the A068400100049 width of the mass distribution near the barrier A068400100050 signifies the onset of a completely different reaction A068400100051 mechanism other than statistical fusion-fission. This A068400100052 different reaction mechanism dominates the fission A068400100053 events at subbarrier energies. The definite A068400100054 correspondence of the change of the mass distribution A068400100055 widths with that of the average value of anisotropy at A068400100056 subbarrier energies, strongly support the assumption ofA068400100057 quasifission reaction, where the dinuclear system A068400100058 passes over a conditional saddle point without A068400100059 equilibration in all degrees of freedom. A068400100060 STATUS (TABLE) Data from authors. A068400100061 HISTORY (20040623C) A068400100062 (20040615R) Data tables were received from T.K.Gnosh. A068400100063 (20040625U) Last checking has been done. A068400100064 (20170211U) SD: Institute code corrected. BIB update. A068400100065 (20210315A) SD: Correction in Subent 002. A068400100066 ENDBIB 64 0 A068400100067 NOCOMMON 0 0 A068400100068 ENDSUBENT 67 0 A068400199999 SUBENT A0684002 20210315 A097A068400200001 BIB 4 7 A068400200002 REACTION (90-TH-232(9-F-19,F)MASS,SEC,FY,,REL) A068400200003 No information about units. A068400200004 COMMENT - By compiler. The authors used "counts" as A068400200005 measurement unit. A068400200006 ERR-ANALYS (DATA-ERR) Probably statistical error. A068400200007 HISTORY (20210315A) SD: SF5=SEC added; SF6=SIG -> FY in A068400200008 REACTION code. A068400200009 ENDBIB 7 0 A068400200010 NOCOMMON 0 0 A068400200011 DATA 4 317 A068400200012 EN-CM MASS DATA DATA-ERR A068400200013 MEV NO-DIM ARB-UNITS ARB-UNITS A068400200014 77.8 45. 2. 1.41421 A068400200015 77.8 50. 3. 1.73205 A068400200016 77.8 55. 3. 1.73205 A068400200017 77.8 60. 5. 2.23607 A068400200018 77.8 65. 8. 2.82843 A068400200019 77.8 70. 12. 3.4641 A068400200020 77.8 75. 20. 4.47214 A068400200021 77.8 80. 19. 4.3589 A068400200022 77.8 85. 27. 5.19615 A068400200023 77.8 90. 45. 6.7082 A068400200024 77.8 95. 52. 7.2111 A068400200025 77.8 100. 70. 8.3666 A068400200026 77.8 105. 106. 10.29563 A068400200027 77.8 110. 83. 9.11043 A068400200028 77.8 115. 126. 11.22497 A068400200029 77.8 120. 110. 10.48809 A068400200030 77.8 125. 113. 10.63015 A068400200031 77.8 130. 110. 10.48809 A068400200032 77.8 135. 101. 10.04988 A068400200033 77.8 140. 85. 9.21954 A068400200034 77.8 145. 86. 9.27362 A068400200035 77.8 150. 64. 8. A068400200036 77.8 155. 42. 6.48074 A068400200037 77.8 160. 34. 5.83095 A068400200038 77.8 165. 21. 4.58258 A068400200039 77.8 170. 15. 3.87298 A068400200040 77.8 175. 10. 3.16228 A068400200041 77.8 180. 5. 2.23607 A068400200042 77.8 185. 4. 2. A068400200043 77.8 190. 3. 1.73205 A068400200044 77.8 195. 5. 2.23607 A068400200045 77.8 200. 0. A068400200046 77.8 205. 0. A068400200047 77.8 210. 0. A068400200048 77.8 215. 0. A068400200049 77.8 220. 0. A068400200050 77.8 225. 0. A068400200051 83.4 45. 0. A068400200052 83.4 48. 2. 1.41421 A068400200053 83.4 51. 3. 1.73205 A068400200054 83.4 54. 5. 2.23607 A068400200055 83.4 57. 7. 2.64575 A068400200056 83.4 60. 9. 3. A068400200057 83.4 63. 21. 4.58258 A068400200058 83.4 66. 14. 3.74166 A068400200059 83.4 69. 25. 5. A068400200060 83.4 72. 12. 3.4641 A068400200061 83.4 75. 37. 6.08276 A068400200062 83.4 78. 30. 5.47723 A068400200063 83.4 81. 61. 7.81025 A068400200064 83.4 84. 74. 8.60233 A068400200065 83.4 87. 62. 7.87401 A068400200066 83.4 90. 91. 9.53939 A068400200067 83.4 93. 106. 10.29563 A068400200068 83.4 96. 133. 11.53256 A068400200069 83.4 99. 154. 12.40967 A068400200070 83.4 102. 182. 13.49074 A068400200071 83.4 105. 196. 14. A068400200072 83.4 108. 210. 14.49138 A068400200073 83.4 111. 231. 15.19868 A068400200074 83.4 114. 239. 15.45962 A068400200075 83.4 117. 257. 16.03122 A068400200076 83.4 120. 285. 16.88194 A068400200077 83.4 123. 283. 16.8226 A068400200078 83.4 126. 280. 16.7332 A068400200079 83.4 129. 274. 16.55295 A068400200080 83.4 132. 262. 16.18641 A068400200081 83.4 135. 244. 15.6205 A068400200082 83.4 138. 229. 15.13275 A068400200083 83.4 141. 225. 15. A068400200084 83.4 144. 219. 14.79865 A068400200085 83.4 147. 160. 12.64911 A068400200086 83.4 150. 135. 11.61895 A068400200087 83.4 153. 119. 10.90871 A068400200088 83.4 156. 103. 10.14889 A068400200089 83.4 159. 89. 9.43398 A068400200090 83.4 162. 71. 8.42615 A068400200091 83.4 165. 48. 6.9282 A068400200092 83.4 168. 57. 7.54983 A068400200093 83.4 171. 56. 7.48331 A068400200094 83.4 174. 34. 5.83095 A068400200095 83.4 177. 28. 5.2915 A068400200096 83.4 180. 22. 4.69042 A068400200097 83.4 183. 15. 3.87298 A068400200098 83.4 186. 12. 3.4641 A068400200099 83.4 189. 10. 3.16228 A068400200100 83.4 192. 6. 2.44949 A068400200101 83.4 195. 3. 1.73205 A068400200102 83.4 198. 6. 2.44949 A068400200103 83.4 201. 5. 2.23607 A068400200104 83.4 204. 2. 1.41421 A068400200105 83.4 207. 0. A068400200106 83.4 210. 0. A068400200107 85.3 45. 0. A068400200108 85.3 48. 1. 1. A068400200109 85.3 51. 2. 1.41421 A068400200110 85.3 54. 3. 1.73205 A068400200111 85.3 57. 1. 1. A068400200112 85.3 60. 10. 3.16228 A068400200113 85.3 63. 12. 3.4641 A068400200114 85.3 66. 16. 4. A068400200115 85.3 69. 19. 4.3589 A068400200116 85.3 72. 26. 5.09902 A068400200117 85.3 75. 33. 5.74456 A068400200118 85.3 78. 50. 7.07107 A068400200119 85.3 81. 76. 8.7178 A068400200120 85.3 84. 86. 9.27362 A068400200121 85.3 87. 103. 10.14889 A068400200122 85.3 90. 133. 11.53256 A068400200123 85.3 93. 134. 11.57584 A068400200124 85.3 96. 189. 13.74773 A068400200125 85.3 99. 183. 13.52775 A068400200126 85.3 102. 251. 15.84298 A068400200127 85.3 105. 234. 15.29706 A068400200128 85.3 108. 280. 16.7332 A068400200129 85.3 111. 315. 17.74824 A068400200130 85.3 114. 325. 18.02776 A068400200131 85.3 117. 354. 18.81489 A068400200132 85.3 120. 354. 18.81489 A068400200133 85.3 123. 350. 18.70829 A068400200134 85.3 126. 341. 18.46619 A068400200135 85.3 129. 352. 18.76166 A068400200136 85.3 132. 347. 18.62794 A068400200137 85.3 135. 332. 18.22087 A068400200138 85.3 138. 285. 16.88194 A068400200139 85.3 141. 248. 15.74802 A068400200140 85.3 144. 238. 15.42725 A068400200141 85.3 147. 217. 14.73092 A068400200142 85.3 150. 214. 14.62874 A068400200143 85.3 153. 170. 13.0384 A068400200144 85.3 156. 131. 11.44552 A068400200145 85.3 159. 117. 10.81665 A068400200146 85.3 162. 89. 9.43398 A068400200147 85.3 165. 101. 10.04988 A068400200148 85.3 168. 58. 7.61577 A068400200149 85.3 171. 57. 7.54983 A068400200150 85.3 174. 30. 5.47723 A068400200151 85.3 177. 29. 5.38516 A068400200152 85.3 180. 25. 5. A068400200153 85.3 183. 17. 4.12311 A068400200154 85.3 186. 12. 3.4641 A068400200155 85.3 189. 14. 3.74166 A068400200156 85.3 192. 8. 2.82843 A068400200157 85.3 195. 5. 2.23607 A068400200158 85.3 198. 4. 2. A068400200159 85.3 201. 2. 1.41421 A068400200160 85.3 204. 2. 1.41421 A068400200161 85.3 207. 2. 1.41421 A068400200162 85.3 210. 2. 1.41421 A068400200163 90. 45. 1. 1. A068400200164 90. 48. 2. 1.41421 A068400200165 90. 51. 4. 2. A068400200166 90. 54. 8. 2.82843 A068400200167 90. 57. 0. A068400200168 90. 60. 7. 2.64575 A068400200169 90. 63. 19. 4.3589 A068400200170 90. 66. 18. 4.24264 A068400200171 90. 69. 27. 5.19615 A068400200172 90. 72. 67. 8.18535 A068400200173 90. 75. 132. 11.48913 A068400200174 90. 78. 200. 14.14214 A068400200175 90. 81. 285. 16.88194 A068400200176 90. 84. 396. 19.89975 A068400200177 90. 87. 514. 22.67157 A068400200178 90. 90. 780. 27.92848 A068400200179 90. 93. 1046. 32.34192 A068400200180 90. 96. 1304. 36.11094 A068400200181 90. 99. 1688. 41.08528 A068400200182 90. 102. 2013. 44.86647 A068400200183 90. 105. 2304. 48. A068400200184 90. 108. 2714. 52.09607 A068400200185 90. 111. 2938. 54.20332 A068400200186 90. 114. 3196. 56.53318 A068400200187 90. 117. 3418. 58.46366 A068400200188 90. 120. 3523. 59.35487 A068400200189 90. 123. 3471. 58.91519 A068400200190 90. 126. 3472. 58.92368 A068400200191 90. 129. 3392. 58.24088 A068400200192 90. 132. 3191. 56.48894 A068400200193 90. 135. 2994. 54.71746 A068400200194 90. 138. 2679. 51.75906 A068400200195 90. 141. 2289. 47.84349 A068400200196 90. 144. 2109. 45.92385 A068400200197 90. 147. 1806. 42.49706 A068400200198 90. 150. 1479. 38.45777 A068400200199 90. 153. 1188. 34.46738 A068400200200 90. 156. 970. 31.14482 A068400200201 90. 159. 750. 27.38613 A068400200202 90. 162. 575. 23.97916 A068400200203 90. 165. 464. 21.54066 A068400200204 90. 168. 327. 18.08314 A068400200205 90. 171. 236. 15.36229 A068400200206 90. 174. 171. 13.0767 A068400200207 90. 177. 142. 11.91638 A068400200208 90. 180. 91. 9.53939 A068400200209 90. 183. 58. 7.61577 A068400200210 90. 186. 40. 6.32456 A068400200211 90. 189. 34. 5.83095 A068400200212 90. 192. 18. 4.24264 A068400200213 90. 195. 13. 3.60555 A068400200214 90. 198. 3. 1.73205 A068400200215 90. 201. 7. 2.64575 A068400200216 90. 204. 4. 2. A068400200217 90. 207. 2. 1.41421 A068400200218 90. 210. 2. 1.41421 A068400200219 93.8 45. 0. A068400200220 93.8 48. 0. A068400200221 93.8 51. 7. 2.64575 A068400200222 93.8 54. 17. 4.12311 A068400200223 93.8 57. 17. 4.12311 A068400200224 93.8 60. 23. 4.79583 A068400200225 93.8 63. 37. 6.08276 A068400200226 93.8 66. 69. 8.30662 A068400200227 93.8 69. 104. 10.19804 A068400200228 93.8 72. 167. 12.92285 A068400200229 93.8 75. 254. 15.93738 A068400200230 93.8 78. 379. 19.46792 A068400200231 93.8 81. 521. 22.82542 A068400200232 93.8 84. 677. 26.01922 A068400200233 93.8 87. 980. 31.30495 A068400200234 93.8 90. 1151. 33.92639 A068400200235 93.8 93. 1502. 38.75564 A068400200236 93.8 96. 1918. 43.79498 A068400200237 93.8 99. 2357. 48.54894 A068400200238 93.8 102. 2680. 51.76872 A068400200239 93.8 105. 2962. 54.42426 A068400200240 93.8 108. 3403. 58.33524 A068400200241 93.8 111. 3782. 61.49797 A068400200242 93.8 114. 3957. 62.90469 A068400200243 93.8 117. 4262. 65.28399 A068400200244 93.8 120. 4396. 66.30234 A068400200245 93.8 123. 4315. 65.68866 A068400200246 93.8 126. 4536. 67.34983 A068400200247 93.8 129. 4327. 65.77994 A068400200248 93.8 132. 4047. 63.61604 A068400200249 93.8 135. 3875. 62.2495 A068400200250 93.8 138. 3517. 59.3043 A068400200251 93.8 141. 3197. 56.54202 A068400200252 93.8 144. 2771. 52.64029 A068400200253 93.8 147. 2497. 49.96999 A068400200254 93.8 150. 2119. 46.0326 A068400200255 93.8 153. 1830. 42.7785 A068400200256 93.8 156. 1488. 38.5746 A068400200257 93.8 159. 1187. 34.45287 A068400200258 93.8 162. 946. 30.75711 A068400200259 93.8 165. 768. 27.71281 A068400200260 93.8 168. 533. 23.08679 A068400200261 93.8 171. 409. 20.22375 A068400200262 93.8 174. 356. 18.86796 A068400200263 93.8 177. 244. 15.6205 A068400200264 93.8 180. 145. 12.04159 A068400200265 93.8 183. 109. 10.44031 A068400200266 93.8 186. 87. 9.32738 A068400200267 93.8 189. 87. 9.32738 A068400200268 93.8 192. 46. 6.78233 A068400200269 93.8 195. 28. 5.2915 A068400200270 93.8 198. 16. 4. A068400200271 93.8 201. 16. 4. A068400200272 93.8 204. 10. 3.16228 A068400200273 93.8 207. 6. 2.44949 A068400200274 93.8 210. 5. 2.23607 A068400200275 97.5 45. 13. 3.60555 A068400200276 97.5 48. 23. 4.79583 A068400200277 97.5 51. 36. 6. A068400200278 97.5 54. 60. 7.74597 A068400200279 97.5 57. 86. 9.27362 A068400200280 97.5 60. 110. 10.48809 A068400200281 97.5 63. 184. 13.56466 A068400200282 97.5 66. 254. 15.93738 A068400200283 97.5 69. 339. 18.41195 A068400200284 97.5 72. 500. 22.36068 A068400200285 97.5 75. 703. 26.51415 A068400200286 97.5 78. 858. 29.29164 A068400200287 97.5 81. 1128. 33.58571 A068400200288 97.5 84. 1484. 38.52272 A068400200289 97.5 87. 1791. 42.32021 A068400200290 97.5 90. 2250. 47.43416 A068400200291 97.5 93. 2721. 52.16321 A068400200292 97.5 96. 3190. 56.48008 A068400200293 97.5 99. 3620. 60.16644 A068400200294 97.5 102. 4162. 64.51356 A068400200295 97.5 105. 4662. 68.27884 A068400200296 97.5 108. 5045. 71.02816 A068400200297 97.5 111. 5350. 73.14369 A068400200298 97.5 114. 5672. 75.31268 A068400200299 97.5 117. 5802. 76.17086 A068400200300 97.5 120. 5822. 76.30203 A068400200301 97.5 123. 5745. 75.79578 A068400200302 97.5 126. 5799. 76.15117 A068400200303 97.5 129. 5728. 75.68355 A068400200304 97.5 132. 5409. 73.5459 A068400200305 97.5 135. 5050. 71.06335 A068400200306 97.5 138. 4525. 67.26812 A068400200307 97.5 141. 4144. 64.37391 A068400200308 97.5 144. 3747. 61.21274 A068400200309 97.5 147. 3340. 57.79273 A068400200310 97.5 150. 2891. 53.76802 A068400200311 97.5 153. 2522. 50.21952 A068400200312 97.5 156. 2169. 46.57252 A068400200313 97.5 159. 1818. 42.63801 A068400200314 97.5 162. 1487. 38.56164 A068400200315 97.5 165. 1222. 34.95712 A068400200316 97.5 168. 955. 30.90307 A068400200317 97.5 171. 788. 28.07134 A068400200318 97.5 174. 607. 24.63737 A068400200319 97.5 177. 495. 22.2486 A068400200320 97.5 180. 364. 19.07878 A068400200321 97.5 183. 292. 17.08801 A068400200322 97.5 186. 193. 13.89244 A068400200323 97.5 189. 150. 12.24745 A068400200324 97.5 192. 110. 10.48809 A068400200325 97.5 195. 91. 9.53939 A068400200326 97.5 198. 80. 8.94427 A068400200327 97.5 201. 54. 7.34847 A068400200328 97.5 204. 40. 6.32456 A068400200329 97.5 207. 28. 5.2915 A068400200330 97.5 210. 12. 3.4641 A068400200331 ENDDATA 319 0 A068400200332 ENDSUBENT 331 0 A068400299999 ENDENTRY 2 0 A068499999999