{"id":7797,"date":"2022-10-21T08:30:22","date_gmt":"2022-10-21T06:30:22","guid":{"rendered":"https:\/\/sceaux-lagazette.fr\/?p=7797"},"modified":"2023-03-12T10:29:38","modified_gmt":"2023-03-12T09:29:38","slug":"quand-helene-langevin-evoque-ses-parents","status":"publish","type":"post","link":"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/","title":{"rendered":"Quand H\u00e9l\u00e8ne Langevin \u00e9voque ses parents"},"content":{"rendered":"\n<p>Dans le cadre de <a href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/09\/28\/exposition-joliot-curie\/\">l\u2019exposition Joliot-Curie<\/a>, une conf\u00e9rence a eu lieu \u00e0 la mairie lundi 10 octobre avec <a href=\"https:\/\/fr.wikipedia.org\/wiki\/H%C3%A9l%C3%A8ne_Langevin-Joliot\" target=\"_blank\" rel=\"noreferrer noopener\">H\u00e9l\u00e8ne Langevin<\/a>, la fille de Fr\u00e9d\u00e9ric et Ir\u00e8ne.<\/p>\n\n\n\n<p>Une centaine de personnes \u00e9taient pr\u00e9sentes. On remarquait notamment de nombreux \u00e9lus de la ville, de Philippe Laurent \u00e0 Jean-Philippe Allardi, en passant par Patrice Patt\u00e9e, Liliane Wietzerbin, Jean-Christophe Dessanges, Fabrice Bernard et Christiane Gautier-Ajzenberg.<\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"alignright size-medium\"><img decoding=\"async\" width=\"300\" height=\"224\" src=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/10\/Helene-Langevin-PL-J-P-A-JB-300x224.jpg\" alt=\"\" class=\"wp-image-7809\" srcset=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/10\/Helene-Langevin-PL-J-P-A-JB-300x224.jpg 300w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/10\/Helene-Langevin-PL-J-P-A-JB-768x573.jpg 768w, https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/10\/Helene-Langevin-PL-J-P-A-JB.jpg 827w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><figcaption>Photo JC Blais<\/figcaption><\/figure><\/div>\n\n\n\n<p>Philippe Laurent ouvre la s\u00e9ance en rendant hommage \u00e0 Jocelyne Blais \u00e0 l\u2019origine de l\u2019exposition et cheville ouvri\u00e8re de sa r\u00e9alisation (H\u00e9l\u00e8ne Langevin en fera autant). Il salue ensuite H\u00e9l\u00e8ne Langevin avant de lui donner la parole.<\/p>\n\n\n\n<p>Pendant une heure, celle qui est directrice de recherche honoraire au CNRS et a manifestement l\u2019habitude de parler en public, pr\u00e9sente et commente des photos de ses parents.<\/p>\n\n\n\n<p>La reprise de tout ce qui a \u00e9t\u00e9 dit serait trop longue. On dira donc ici quelques mots sur ce qui a valu le prix Nobel \u00e0 <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Fr%C3%A9d%C3%A9ric_Joliot-Curie\" target=\"_blank\" rel=\"noreferrer noopener\">Fr\u00e9d\u00e9ric<\/a> et <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Ir%C3%A8ne_Joliot-Curie\" target=\"_blank\" rel=\"noreferrer noopener\">Ir\u00e8ne Joliot Curie<\/a> pour ensuite relever surtout ce qui, dans les souvenirs de leur fille, r\u00e9v\u00e8le la personnalit\u00e9 de ses parents.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La d\u00e9couverte de la radioactivit\u00e9 artificielle<\/h2>\n\n\n\n<p>Lors du <a rel=\"noreferrer noopener\" href=\"https:\/\/fr.wikipedia.org\/wiki\/Congr%C3%A8s_Solvay\" target=\"_blank\">congr\u00e8s Solvay<\/a> de 1933, qui r\u00e9unit la cr\u00e8me des physiciens de l\u2019\u00e9poque, Fr\u00e9d\u00e9ric et Ir\u00e8ne pr\u00e9sentent une exp\u00e9rience consistant \u00e0 bombarder une feuille d\u2019aluminium avec un <a rel=\"noreferrer noopener\" href=\"https:\/\/www.irsn.fr\/FR\/connaissances\/Sante\/rayonnements-ionisants-effets-radioprotection-sante\/effets-rayonnements-ionisants\/Pages\/2-differents-rayonnements-ionisants.aspx\" target=\"_blank\">rayonnement alpha<\/a> (c\u2019est-\u00e0-dire un faisceau de noyaux d\u2019h\u00e9lium compos\u00e9 de deux protons et deux neutrons). La pr\u00e9sentation ne convainc pas et les deux chercheurs am\u00e9liorent leur proc\u00e9d\u00e9. Ils <a rel=\"noreferrer noopener\" href=\"https:\/\/journals.openedition.org\/bibnum\/840\" target=\"_blank\">arrivent \u00e0 montrer<\/a> qu\u2019il se cr\u00e9e d\u2019abord du <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Isotopes_du_phosphore\" target=\"_blank\" rel=\"noreferrer noopener\">phosphore 30<\/a> puis que celui-ci se transmute en <a href=\"https:\/\/fr.wikipedia.org\/wiki\/Isotopes_du_silicium\" target=\"_blank\" rel=\"noreferrer noopener\">silicium 30<\/a> (il a une demi-vie de 3mn 15) \u00e9mettant un positon. Deux \u00e9l\u00e9ments artificiels (des \u00e9l\u00e9ments qu\u2019on ne trouve pas dans la nature, car instable avec une demi-vie courte) ont ainsi successivement \u00e9t\u00e9 cr\u00e9\u00e9s (voir description ici). La r\u00e9ussite de l\u2019exp\u00e9rience tient notamment aux proc\u00e9d\u00e9s chimiques mis en place pour mettre en \u00e9vidence les \u00e9l\u00e9ments cr\u00e9\u00e9s. Les r\u00e9sultats sont r\u00e9compens\u00e9s par le Nobel de chimie en 1935.<\/p>\n\n\n\n<p>\u00ab<em>&nbsp;Ces travaux prolongeaient ceux r\u00e9alis\u00e9s par Pierre et Marie Curie&nbsp;\u00bb, <\/em>pr\u00e9cise H\u00e9l\u00e8ne Langevin.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">La personnalit\u00e9 des deux chercheurs.<\/h2>\n\n\n\n<p>Ses parents ont v\u00e9cu une p\u00e9riode compliqu\u00e9e entre les deux guerres mondiales. Sur les premi\u00e8res photos les montrant ensemble en 1926, l\u2019ann\u00e9e de leur mariage(il n\u2019existe pas de photo de cet \u00e9v\u00e9nement), elle commente&nbsp;: \u00ab&nbsp;<em>C\u2019est l\u2019association dans le travail et dans la vie de deux personnes qui ne se ressemblent pas, mais qui sont compl\u00e9mentaires, partageant une passion pour la recherche et l\u2019engagement \u00e0 gauche&nbsp;\u00bb<\/em><\/p>\n\n\n\n<p>On notera ici qu\u2019<a href=\"https:\/\/www.pourlascience.fr\/sd\/histoire-sciences\/la-radioactivite-artificielle-4517.php\" target=\"_blank\" rel=\"noreferrer noopener\">un article de <em>Pour la Science<\/em> <\/a>en 2001 en apporte une confirmation&nbsp;: \u00ab&nbsp;<em>Fr\u00e9d\u00e9ric et Ir\u00e8ne se compl\u00e8tent et ils en ont conscience. Il est audacieux, tr\u00e8s adroit manuellement et d\u00e9borde d\u2019imagination ; elle est pond\u00e9r\u00e9e, tenace et m\u00e9thodique<\/em>.&nbsp;\u00bb<\/p>\n\n\n\n<p>H\u00e9l\u00e8ne Langevin donne de ses parents quelques aper\u00e7us intimistes qui leur donne chair. &nbsp;Son p\u00e8re \u00e9tait \u00ab&nbsp;<em>un incorrigible bavard, mais en m\u00eame temps, une des personnes sachant le mieux \u00e9couter les autres<\/em>&nbsp;\u00bb. Sa m\u00e8re, qui a perdu son propre p\u00e8re \u00e0 8 ans, a \u00e9t\u00e9 tr\u00e8s li\u00e9e \u00e0 son grand p\u00e8re dont elle tient \u00ab&nbsp;<em>quelques id\u00e9es simples sur la vie<\/em>&nbsp;\u00bb. Ir\u00e8ne Curie a \u00e9t\u00e9 tr\u00e8s marqu\u00e9e par la guerre de 14&nbsp;: elle a pass\u00e9 son dipl\u00f4me d\u2019infirmi\u00e8re en aidant sa m\u00e8re \u00e0 installer les unit\u00e9s de radiologie sur le front, avant de rester \u00e0 l\u2019Institut pour former les manipulateurs. &nbsp;<\/p>\n\n\n\n<p><em>Ils \u00e9taient passionn\u00e9s de recherche, mais l\u00e0 n\u2019\u00e9tait pas toute leur vie. Ils \u00e9taient attach\u00e9s \u00e0 la vie de famille, \u00e0 leurs engagements, \u00e0 leurs loisirs&nbsp;: comme la p\u00eache pour Fr\u00e9d\u00e9ric, le ski et les vacances en Bretagne pour les deux. Ils se sont beaucoup occup\u00e9s de leurs enfants, mais ceux-ci n\u2019\u00e9taient pas le centre du monde (ils ne devaient pas \u00ab&nbsp;faire d\u2019embarras&nbsp;\u00bb d\u2019apr\u00e8s Ir\u00e8ne).<\/em><\/p>\n\n\n\n<p>La construction de la maison du parc de Sceaux, qu\u2019habite toujours H\u00e9l\u00e8ne Langevin, date de 1935. A une question pos\u00e9e sur le choix de l\u2019architecte, l\u2019intervenante r\u00e9pondra qu\u2019il s\u2019agissait d\u2019un ami, que le couple lui a fait confiance, insistant seulement pour avoir une tr\u00e8s grande salle de s\u00e9jour.<\/p>\n\n\n\n<p>L\u2019\u00e9change avec la salle pr\u00e9cise un peu la personnalit\u00e9 de ses parents.<\/p>\n\n\n\n<p>Quand H\u00e9l\u00e8ne fut \u00e9l\u00e8ve du lyc\u00e9e Marie Curie de Sceaux, sa m\u00e8re fit partie du conseil d\u2019administration. On apprend qu\u2019elle s\u2019inqui\u00e9ta de l\u2019avancement des travaux du gymnase. Ou bien qu\u2019un enseignant s\u2019\u00e9tonna qu\u2019H\u00e9l\u00e8ne se retrouve en classe \u00ab&nbsp;moderne&nbsp;\u00bb et n\u2019apprenne pas le grec et le latin. A quoi, Ir\u00e8ne r\u00e9pondit qu\u2019elle trouvait plus important que sa fille soit dans les sciences que dans les textes anciens. J<\/p>\n\n\n\n<p>A la question sur la conscience des dangers de la radioactivit\u00e9, elle explique que les risques ont toujours \u00e9t\u00e9 connus des scientifiques. Ce sont les normes qui \u00e9voluent (\u00e0 la baisse) dans le temps.<\/p>\n\n\n\n<p>R\u00e9pondant \u00e0 une question sur la guerre de 39\/45, H\u00e9l\u00e8ne Langevin \u00e9voque l\u2019exode. Sa famille part \u00e0 Bordeaux pour pouvoir exp\u00e9dier certains produits cl\u00e9s en Angleterre. Ensuite, ils font le choix de rester en France. L\u2019arrestation de Paul Langevin (par la Gestapo) le 30 octobre 1940 fait basculer Fr\u00e9d\u00e9ric (et beaucoup d\u2019autres dans le milieu de la science) dans la R\u00e9sistance. Il rejoint<a href=\"https:\/\/fr.wikipedia.org\/wiki\/Front_national_(R%C3%A9sistance)\" target=\"_blank\" rel=\"noreferrer noopener\"> le Front national<\/a> pour la lib\u00e9ration de la France, dont il devient l\u2019un des responsables. Il travaille pourtant avec l\u2019allemand qui a pris la possession de son labo, car il le connait depuis longtemps et le sait antinazi. D\u00e9but 1944, sa participation \u00e0 la R\u00e9sistance devient connue de trop de gens. Il passe dans la clandestinit\u00e9, alors qu\u2019H\u00e9l\u00e8ne de son c\u00f4t\u00e9 passe son bac.<\/p>\n\n\n\n<p>Une question porte sur l\u2019origine du nom Joliot-Curie. Elle \u00e9voque une l\u00e9gende selon laquelle c\u2019est Paul Langevin qui l\u2019utilise le premier. Elle observe que son p\u00e8re utilisait le seul nom Joliot et pense que les choses se sont faites progressivement. Elle y voit une volont\u00e9 de ne pas laisser dispara\u00eetre le nom de Curie.<\/p>\n\n\n\n<p>Une autre question porte sur la mani\u00e8re dont Fr\u00e9d\u00e9ric conciliait son pacifisme et sa fonction au Commissariat \u00e0 l\u2019\u00e9nergie atomique. Pour sa fille, il n\u2019\u00e9tait pas question en 1946 de toucher \u00e0 la bombe. Il y a eu une discussion \u00e0 l\u2019ONU sur le contr\u00f4le des installations nucl\u00e9aires. Dans les ann\u00e9es 60 d\u00e9marre une campagne contre les essais nucl\u00e9aires, mais pour H\u00e9l\u00e8ne, \u00ab&nbsp;<em>si on avait laiss\u00e9 faire les scientifiques, on aurait trouv\u00e9 une solution<\/em>&nbsp;\u00bb.<\/p>\n\n\n\n<p>De longs applaudissements ont ponctu\u00e9 la soir\u00e9e. C\u2019est une grande dame qui parlait. Elle d\u00e9gageait la force d\u2019exemple de grands scientifiques qui ne se sont pas content\u00e9s de se concentrer sur leur recherche et qui ont bien m\u00e9rit\u00e9 les fun\u00e9railles nationales qui les ont salu\u00e9s.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Dans le cadre de l\u2019exposition Joliot-Curie, une conf\u00e9rence a eu lieu \u00e0 la mairie lundi 10 octobre avec H\u00e9l\u00e8ne Langevin, la fille de Fr\u00e9d\u00e9ric et Ir\u00e8ne. Une centaine de personnes \u00e9taient pr\u00e9sentes. On remarquait notamment de nombreux \u00e9lus de la ville, de Philippe Laurent \u00e0 Jean-Philippe Allardi, en passant par&#8230;<\/p>\n","protected":false},"author":11,"featured_media":7808,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"_uf_show_specific_survey":0,"_uf_disable_surveys":false,"footnotes":""},"categories":[253],"tags":[],"class_list":["post-7797","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-manifestations-locales","entry","simple"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.6 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Quand H\u00e9l\u00e8ne Langevin \u00e9voque ses parents - La Gazette<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/\" \/>\n<meta property=\"og:locale\" content=\"fr_FR\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Quand H\u00e9l\u00e8ne Langevin \u00e9voque ses parents - La Gazette\" \/>\n<meta property=\"og:description\" content=\"Dans le cadre de l\u2019exposition Joliot-Curie, une conf\u00e9rence a eu lieu \u00e0 la mairie lundi 10 octobre avec H\u00e9l\u00e8ne Langevin, la fille de Fr\u00e9d\u00e9ric et Ir\u00e8ne. Une centaine de personnes \u00e9taient pr\u00e9sentes. On remarquait notamment de nombreux \u00e9lus de la ville, de Philippe Laurent \u00e0 Jean-Philippe Allardi, en passant par&#8230;\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/\" \/>\n<meta property=\"og:site_name\" content=\"La Gazette\" \/>\n<meta property=\"article:published_time\" content=\"2022-10-21T06:30:22+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2023-03-12T09:29:38+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/10\/Helene-Langevin-seule.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"960\" \/>\n\t<meta property=\"og:image:height\" content=\"541\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"G\u00e9rard Bardier\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"\u00c9crit par\" \/>\n\t<meta name=\"twitter:data1\" content=\"G\u00e9rard Bardier\" \/>\n\t<meta name=\"twitter:label2\" content=\"Dur\u00e9e de lecture estim\u00e9e\" \/>\n\t<meta name=\"twitter:data2\" content=\"6 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/\"},\"author\":{\"name\":\"G\u00e9rard Bardier\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/#\/schema\/person\/5650e206a121f68c6f5e76379bccfbc4\"},\"headline\":\"Quand H\u00e9l\u00e8ne Langevin \u00e9voque ses parents\",\"datePublished\":\"2022-10-21T06:30:22+00:00\",\"dateModified\":\"2023-03-12T09:29:38+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/\"},\"wordCount\":1265,\"commentCount\":1,\"publisher\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/#organization\"},\"image\":{\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/sceaux-lagazette.fr\/wp-content\/uploads\/2022\/10\/Helene-Langevin-seule.jpg\",\"articleSection\":[\"Manifestations locales\"],\"inLanguage\":\"fr-FR\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/\",\"url\":\"https:\/\/sceaux-lagazette.fr\/index.php\/2022\/10\/21\/quand-helene-langevin-evoque-ses-parents\/\",\"name\":\"Quand H\u00e9l\u00e8ne Langevin \u00e9voque ses parents - 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