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Otto Robert Frisch

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657: 614: 589:". His body reflected neutrons back into the stack. Out of the corner of his eye he saw that the red lamps that flickered intermittently when neutrons were being emitted, were 'glowing continuously'. Realizing what was happening, Frisch quickly scattered the bars with his hand. Later he calculated that the radiation dose was "quite harmless" but that if he "had hesitated for another two seconds before removing the material ... the dose would have been fatal". "In two seconds he received, by the generous standards of the time, a full day's permissible dose of neutron radiation." In this way his experiments determined the exact masses of uranium required to fire the 561: 55: 1467: 191: 265: 427: 1402:
O. R. Frisch brought to physics the approach of a craftsman. He enjoyed, above all, doing experiments with his own hands, preferably on apparatus of his own design, aimed at simple basic questions. This approach required the ability to think about the important problems of physics simply, but deeply,
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Political restraints of the Nazi era forced the teams of Hahn and Strassmann and that of Frisch and Meitner (both of whom were Jewish) to publish separately. Hahn's paper described the experiment and the finding of the barium byproduct. Meitner's and Frisch's paper explained the physics behind the
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which would be required to create the critical mass, the mass of uranium which would sustain a nuclear chain reaction. He did this by stacking several dozen 3 cm bars of enriched uranium hydride at a time and measuring rising neutron activity as the critical mass was approached. The
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as one of its byproducts. Hahn, in a letter to Meitner, called this new reaction a "bursting" of the uranium nucleus. Frisch and Meitner hypothesized that the uranium nucleus had split in two, explained the process, and estimated the energy released, and Frisch coined the term
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He also designed the "dragon's tail" or "guillotine" experiment in which a uranium slug was dropped through a hole in larger fixed mass of uranium, reaching just above critical mass (0.1%) for a fraction of a second. At the meeting to approve the experiment,
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Frisch went back to Copenhagen, where he was quickly able to isolate the pieces produced by fission reactions. As Frisch himself later recalled, a fundamental idea of the direct experimental proof of the nuclear fission was suggested to him by
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and could be made to achieve criticality using conventional explosives to create an immensely powerful detonation. The memorandum went on to predict the effects of such an explosion—from the initial blast to the resulting
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The paper is dated 16 January 1939. Meitner is identified as being at the Physical Institute, Academy of Sciences, Stockholm. Frisch is identified as being at the Institute of Theoretical Physics, University of
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an ability underlying the two contributions for which he was best known: his share in the explanation of the fission process and that in the recognition of the feasibility of an atomic weapon.
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We were building an unusual assembly, with no reflecting material around it; just the reacting compound of uranium-235 ... For obvious reasons we called it the Lady Godiva assembly.
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in the metal bars increased the time that the reaction required to accelerate. One day Frisch almost caused a runaway reaction by leaning over the stack, which he termed the "
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Hahn, O.; Strassmann, F. (1939). "Ăśber den Nachweis und das Verhalten der bei der Bestrahlung des Urans mittels Neutronen entstehenden Erdalkalimetalle ".
1494: 648:. Seeing that this had wider applications, he helped found a company, Laser-Scan Limited, now known as Laser-Scan Engineering Ltd., to exploit the idea. 203: 40: 333:
family, the son of Justinian Frisch, a painter, and Auguste Meitner Frisch, a concert pianist. He himself was talented at both but also shared his aunt
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Oral history interview transcript with Otto Robert Frisch on 3 May 1967, American Institute of Physics, Niels Bohr Library & Archives
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Oral history interview transcript with Otto Robert Frisch on 8 May 1963, American Institute of Physics, Niels Bohr Library & Archives
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Frisch, Otto R.; Stern, Otto (1933). "Ăśber die magnetische Ablenkung von WasserstoffmolekĂĽlen und das magnetische Moment des Protons".
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The authors were identified as being at the Kaiser-Wilhelm-Institut fĂĽr Chemie, Berlin-Dahlem. Received 22 December 1938.
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The paper is dated 17 January 1939. [The experiment for this letter to the editor was conducted on 13 January 1939; see
893: 421: 576:, one of Frisch's tasks as the leader of the Critical Assemblies group was to accurately determine the exact amount of 490:. Many feel that Meitner and Frisch deserved Nobel Prize recognition for their contributions to understanding fission. 1547: 207: 156: 44: 275: 1602: 1542: 1002: 634: 294: 279: 804: 539: 510: 1457: 1452: 514: 243:(coining the term) and first experimentally detected the fission by-products. Later, with his collaborator 54: 1552: 763: 1214: 1504: 1323: 1143: 664:
He retired from the chair in 1972 as required by University regulations. He died on 22 September 1979.
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After some years working in relatively obscure laboratories in Germany, Frisch obtained a position in
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to the chancellorship of Germany in 1933 caused Otto Robert Frisch to make the decision to move to
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In 1946 he returned to England to take up the post of head of the nuclear physics division of the
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Annotated bibliography for Otto Frisch from the Alsos Digital Library for Nuclear Issues
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In mid-1939 Frisch left Denmark for what he anticipated would be a short trip to
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at Harwell, though he also spent much of the next thirty years teaching at
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People associated with the nuclear weapons programme of the United Kingdom
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Otto Frisch, "What Little I Remember", Cambridge University Press (1979),
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where he was Jacksonian Professor of Natural Philosophy and a fellow of
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The Prometheus Bomb: The Manhattan Project and Government in the Dark
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he designed the first theoretical mechanism for the detonation of an
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University of Birmingham - Poynting Physics Building - blue plaque
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1939–40. He went to America in 1943 having been hurriedly made a
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precluded his return. With war on his mind, he and the physicist
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Otto R. Frisch, "The Discovery of Fission – How It All Began",
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Jews who immigrated to the United Kingdom to escape Nazism
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During the Christmas holiday in 1938, he visited his aunt
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Los Alamos National Laboratory on the British mission
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Q is for Quantum: An Encyclopedia of Particle Physics
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Biographical Memoirs of Fellows of the Royal Society
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Biographical Memoirs of Fellows of the Royal Society
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While there she received the news that 313:Learn how and when to remove this message 1628:Fellows of the American Physical Society 640:Before he retired he designed a device, 1129:J. A. Wheeler, "Mechanism of Fission", 672: 457:had discovered that the collision of a 27:Austrian-born British nuclear physicist 1332: 1321: 1593:Fellows of Trinity College, Cambridge 1292:"Experiments with the Dragon Machine" 1001:Meitner, Lise; Frisch, O. R. (1939). 858:. Simon & Schuster. p. 150. 680: 678: 676: 408:where he increasingly specialised in 7: 1468:Works by or about Otto Robert Frisch 627:Atomic Energy Research Establishment 291:adding citations to reliable sources 412:, particularly in neutron physics. 25: 734:; Winter, George (January 1980). 1533:20th-century Austrian scientists 263: 189: 1633:20th-century British physicists 1251:. Simon and Schuster. pp.  1193:. Simon and Schuster. pp.  1102:. Simon and Schuster. pp.  430:Otto Frisch, Lise Meitner, and 390:Patrick Maynard Stuart Blackett 384:, where he joined the staff at 736:"Obituary: Otto Robert Frisch" 532:part of the British delegation 526:project) and also that of the 388:and worked with the physicist 1: 1247:The Making of the Atomic Bomb 1189:The Making of the Atomic Bomb 1120:, V20, N11, pp. 43-48 (1967). 1098:The Making of the Atomic Bomb 924:The Making of the Atomic Bomb 465:nucleus produced the element 59:Otto Robert Frisch's wartime 1588:Fellows of the Royal Society 1213:Frisch, Otto Robert (1980). 1144:"Fame without a Nobel Prize" 894:University of Nebraska Press 478:in biology, to describe it. 422:Discovery of nuclear fission 1563:Austrian nuclear physicists 1133:V20, N11, pp. 49-52 (1967). 157:Fellow of the Royal Society 1649: 1558:British nuclear physicists 886:Sullivan, Neil J. (2016). 621:and John Cockcroft in 1946 553: 530:on which Frisch worked as 419: 396:technology and artificial 1501: 1492: 1484: 1479: 507:Frisch–Peierls memorandum 188: 179: 162: 52: 1568:Manhattan Project people 1243:Rhodes, Richard (1986). 1185:Rhodes, Richard (1986). 1165:University of Birmingham 1094:Rhodes, Richard (1986). 540:University of Birmingham 511:University of Birmingham 1290:r.e. Malenfant (2005). 782:Encyclopedia Brittanica 1618:Scientists from Vienna 1430:What Little I Remember 1390:10.1098/rsbm.1981.0012 1331:Cite journal requires 1216:What Little I Remember 1052:Frisch, O. R. (1939). 805:Zeitschrift fĂĽr Physik 709:10.1098/rsbm.1981.0012 661: 622: 569: 497:, but the outbreak of 434: 227:he first measured the 1370:Peierls, Rudolf Ernst 766:on 28 September 2013. 659: 616: 563: 429: 1418:Atomic Physics Today 852:Gribbin, J. (2000). 587:Lady Godiva assembly 339:University of Vienna 287:improve this section 137:University of Vienna 1538:Austrian physicists 1372:(1 November 1981). 1070:1939Natur.143..276F 1021:1939Natur.143..239M 971:1939NW.....27...11H 959:Naturwissenschaften 818:1933ZPhy...85....4F 752:1980PhT....33a..99B 361:-winning scientist 325:Frisch was born in 1548:British physicists 1424:Working with ATOMS 1146:. 5 November 2015. 979:10.1007/BF01488241 826:10.1007/BF01330773 662: 623: 570: 435: 225:Immanuel Estermann 200:Otto Robert Frisch 36:Otto Robert Frisch 1603:Austrian refugees 1543:Jewish physicists 1511: 1510: 1502:Succeeded by 1480:Academic offices 1277:"Here Be Dragons" 1015:(3615): 239–240. 935:978-0-684-81378-3 903:978-1-61234-890-2 865:978-0-684-86315-3 760:10.1063/1.2913924 609:Return to England 556:Manhattan Project 550:Manhattan Project 528:Manhattan Project 474:, adopted from a 376:The accession of 323: 322: 315: 197: 196: 164:Scientific career 97:22 September 1979 16:(Redirected from 1640: 1485:Preceded by 1477: 1472:Internet Archive 1406: 1405: 1366: 1360: 1350: 1341: 1340: 1334: 1329: 1327: 1319: 1287: 1281: 1280: 1273: 1267: 1266: 1250: 1240: 1234: 1233: 1210: 1199: 1198: 1192: 1182: 1176: 1175: 1173: 1171: 1162: 1154: 1148: 1147: 1140: 1134: 1127: 1121: 1114: 1108: 1107: 1101: 1091: 1081: 1079:10.1038/143276a0 1049: 1043: 1040: 1029:10.1038/143239a0 998: 992: 990: 954: 948: 947: 927: 914: 908: 907: 883: 877: 876: 874: 872: 849: 838: 837: 799: 793: 792: 790: 788: 774: 768: 767: 762:. Archived from 728: 722: 721: 711: 682: 578:enriched uranium 451:Fritz Strassmann 386:Birkbeck College 318: 311: 307: 304: 298: 267: 259: 210: 193: 107:, United Kingdom 100: 78: 76: 57: 47: 32: 21: 1648: 1647: 1643: 1642: 1641: 1639: 1638: 1637: 1513: 1512: 1507: 1498: 1490: 1439: 1414: 1409: 1368: 1367: 1363: 1351: 1344: 1330: 1320: 1289: 1288: 1284: 1275: 1274: 1270: 1263: 1242: 1241: 1237: 1227: 1212: 1211: 1202: 1184: 1183: 1179: 1169: 1167: 1160: 1156: 1155: 1151: 1142: 1141: 1137: 1128: 1124: 1115: 1111: 1093: 1051: 1050: 1046: 1000: 999: 995: 956: 955: 951: 936: 918:Rhodes, Richard 916: 915: 911: 904: 885: 884: 880: 870: 868: 866: 851: 850: 841: 801: 800: 796: 786: 784: 776: 775: 771: 730: 729: 725: 684: 683: 674: 670: 654: 646:bubble chambers 635:Trinity College 611: 603:Richard Feynman 558: 552: 544:British citizen 424: 418: 416:Nuclear fission 410:nuclear physics 367:magnetic moment 351: 349:Nuclear physics 319: 308: 302: 299: 284: 268: 257: 241:nuclear fission 229:magnetic moment 217:nuclear physics 202: 133:Alma mater 127: 108: 102: 98: 89: 87:Austria-Hungary 80: 74: 72: 64: 48: 39: 37: 28: 23: 22: 15: 12: 11: 5: 1646: 1644: 1636: 1635: 1630: 1625: 1620: 1615: 1610: 1605: 1600: 1595: 1590: 1585: 1580: 1575: 1570: 1565: 1560: 1555: 1550: 1545: 1540: 1535: 1530: 1525: 1515: 1514: 1509: 1508: 1503: 1500: 1491: 1488:John Cockcroft 1486: 1482: 1481: 1475: 1474: 1465: 1460: 1455: 1450: 1445: 1438: 1437:External links 1435: 1434: 1433: 1427: 1421: 1413: 1410: 1408: 1407: 1361: 1342: 1333:|journal= 1300:10.2172/876514 1282: 1268: 1261: 1235: 1225: 1200: 1177: 1149: 1135: 1122: 1109: 1044: 993: 949: 934: 909: 902: 896:. p. 19. 878: 864: 839: 794: 769: 723: 671: 669: 666: 653: 650: 619:Rudolf Peierls 610: 607: 554:Main article: 551: 548: 536:Rudolf Peierls 503:Rudolf Peierls 488:George Placzek 420:Main article: 417: 414: 350: 347: 321: 320: 271: 269: 262: 256: 253: 245:Rudolf Peierls 215:who worked on 195: 194: 186: 185: 181: 180: 177: 176: 171: 167: 166: 160: 159: 154: 150: 149: 144: 143:Known for 140: 139: 134: 130: 129: 128:United Kingdom 124: 120: 119: 114: 110: 109: 103: 101:(aged 74) 95: 91: 90: 81: 79:1 October 1904 70: 66: 65: 63:ID badge photo 58: 50: 49: 38: 35: 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1645: 1634: 1631: 1629: 1626: 1624: 1621: 1619: 1616: 1614: 1611: 1609: 1606: 1604: 1601: 1599: 1596: 1594: 1591: 1589: 1586: 1584: 1581: 1579: 1576: 1574: 1571: 1569: 1566: 1564: 1561: 1559: 1556: 1554: 1553:Austrian Jews 1551: 1549: 1546: 1544: 1541: 1539: 1536: 1534: 1531: 1529: 1526: 1524: 1521: 1520: 1518: 1506: 1497: 1496: 1489: 1483: 1478: 1473: 1469: 1466: 1464: 1461: 1459: 1456: 1454: 1451: 1449: 1446: 1444: 1441: 1440: 1436: 1431: 1428: 1425: 1422: 1419: 1416: 1415: 1411: 1404: 1399: 1395: 1391: 1387: 1383: 1379: 1375: 1371: 1365: 1362: 1359: 1358:0-521-40583-1 1355: 1349: 1347: 1343: 1338: 1325: 1317: 1313: 1309: 1305: 1301: 1297: 1293: 1286: 1283: 1278: 1272: 1269: 1264: 1262:9780671441333 1258: 1254: 1249: 1248: 1239: 1236: 1232: 1228: 1226:0-52-128010-9 1222: 1218: 1217: 1209: 1207: 1205: 1201: 1196: 1191: 1190: 1181: 1178: 1166: 1159: 1153: 1150: 1145: 1139: 1136: 1132: 1131:Physics Today 1126: 1123: 1119: 1118:Physics Today 1113: 1110: 1105: 1100: 1099: 1089: 1085: 1080: 1075: 1071: 1067: 1064:(3616): 276. 1063: 1059: 1055: 1048: 1045: 1038: 1034: 1030: 1026: 1022: 1018: 1014: 1010: 1009: 1004: 997: 994: 988: 984: 980: 976: 972: 968: 964: 961:(in German). 960: 953: 950: 945: 941: 937: 931: 926: 925: 919: 913: 910: 905: 899: 895: 891: 890: 882: 879: 867: 861: 857: 856: 848: 846: 844: 840: 835: 831: 827: 823: 819: 815: 812:(1–2): 4–16. 811: 808:(in German). 807: 806: 798: 795: 783: 779: 773: 770: 765: 761: 757: 753: 749: 746:(1): 99–100. 745: 741: 740:Physics Today 737: 733: 727: 724: 719: 715: 710: 705: 701: 697: 696: 691: 687: 681: 679: 677: 673: 667: 665: 658: 651: 649: 647: 643: 638: 636: 632: 628: 620: 615: 608: 606: 604: 598: 596: 592: 588: 584: 579: 575: 568:at Los Alamos 567: 566:Godiva device 562: 557: 549: 547: 545: 541: 537: 534:. 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Index

Otto Frisch
OBE
FRS

Los Alamos
Vienna
Austria-Hungary
Cambridge
Austrian
University of Vienna
Atomic bomb
Fellow of the Royal Society
Physics

OBE
FRS
physicist
nuclear physics
Otto Stern
Immanuel Estermann
magnetic moment
proton
Lise Meitner
nuclear fission
Rudolf Peierls
atomic bomb

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