山田シンポジウム援助一覧表
組織委員長
高輝度光科学研究センター
大阪大学名誉教授
江 尻 宏 泰集ム

名Yamada Symposium l
Neutrinos and Dark h/1atter in Nuclear
Physics 03

会

期

2003

地

奈良市

6/9‑6/14

1件

開 催

援 助金 8,800,000円

成果報 告
山田 シ ンポ ジウ ム 1 : N e u t r i n o s a n d D a r k M a t t e r i n N u c l e a r P h y s i c s
2003年6月 9日 〜 6月 14日 於奈 良新公会堂 &奈 良ホテル

組織委員長 高 輝度光科学研究 セ ンター ・大阪大学名誉教授 江尻宏 泰

第 1回 山田 シンポジウム、Neutrinos and Dark Matter in Nuclear Physicsの概要 と特徴 を記す。詳細 はCircular(1),PrOceedings(2), Web site(3)に公開 してある。
1.山 田財団 25周 年 にあた リス ター トした新 しいシンポジウム。将 来へ の学問 の発展 に重点 をお き、現
在発展 しつつ ある興味ある基礎科学の現状 と将来へ の展望 を、将来性 を担 う若 い研究者 を含 む最先端の研究者 と討論。2002年 2‑5月 の理事会 ・評議会 で決 まり、YSlと して行われた。
2.主 題は原子核物理に於けるニ ュー トリノとダー クマ ター (暗黒物質)で 、現在研究が発展 しつつ あ り、
新 しい (標準理論 を超 える)素 粒子宇宙像 の確 立 につ なが る重 要テーマ。素粒子、宇宙、原子核の分野にまたがる広 い分野か ら各界 の最先端 の研究者 と討論。
3.二 重 ベ ー タ崩壊研究やダー クマ ター研究 の最新 の研究、将来 に向けて のニュー トリノ質量研究、超新星 とニ ュー トリノなどで、世界 で初めての研究発表がなされ、 レベ ルの高 い最先端 の研究 とこれか らの研究 の展望が議論 された。
4.シ ンポジウムの組織 での特徴 は 19カ 国か ら 22人 (内 2人 は YSF評 議委員)の 顕著 な研究者がInternational Advisorsとして協力 し、その内 12人 が参加発表 し、多 くが若 い研究者を推薦 して くれた。
5.シ ンポジウムの規模 は 14カ 国 69人 (内 70%は 海外)の 研究者 と 15人 の国内か らの大学院学生の 84
人が参加者。 いずれ も最先端 の活発 な研究者で、学生、PDク ラス、若 い研究者が6害J程度で、十分 な
討論 と交流がで きた。他 に同伴者 8人 。
6。 日程は 5日 半 で、3日 半 は奈良公園内の奈良新公会堂、ユ日は奈良ホテル、1日 は大塔 コスモ観測所見
学 と大塔 セ ンターで行った。期 間中の 3日 目の午後は Free(但 し夕方の Sessionあり)と し、 自由な
討論 の時間 とした。ポスターセ ッシ ョンを1つつ くった。時間にゆとりを持たせ、 自由討論 と交流が十分に行われ た。
7.シ ンポ ジウムの最終 日はパ ネ ル討論 として研究 の最前線 の現在 と展望 につい ての 3人 の Leading
Scientistsの話があった。最後 に特別 セ ッションとして小柴氏 にニュー トリノ天文学の これまで とこれ
か らについ て話 をして いただい た。本 シンポジウムのハ イライ トで、極 めて追力あ り、示唆 に富 む話であ った。
8。 本 シンポジウムの Presidentに山田安定財団理事長 になっていただき、 開会、IACと の会 食、晩餐会等
で、理事長が シンポジウムの理念、山田科学振興財団の方針、基礎科学 の考 え方等 を話 された。 これ‑27‑

らの話 に多 くの参加者が大変感銘 を受けた事 を表明 してい た。 また大塔村、北村村長の生 の挨拶 (代筆、代読 でない ￨)に も多 くの参加者が 「
地方には優れた Statesmanがいると」感心 した。
YSl―
NDh/103が大変 EnjoyableでPrOductiveであった ことによ り、同様な趣 旨で続けて行 く事 になった。次回 (第二 回 NDM)は NDA/106をパ リで 2006年 に行 う。NDM06の 責任者 (PrOi S.」
ullian)と私は 2月 中旬東京で打ち合わせ を行った。
シンポジウム後 に半 日、二重ベ ー タ崩壊 によるニ ュー トリノ国際協カ ネッ トヮー クの会が持 たれた (4)。
この他 にも共同研究など活発な議論が行なわれた。
会 の組織運営等は全て Electric(ポスター以外)に 行 い Circular,Proceedings等
も Websiteで行なった。
Websiteの サ ーバ ーや事務局 は大阪大学理 学部、岸本一 能町研究室 (旧江尻研究室)が 協力。特 にScientinc Secretary小川氏が奮闘。YS委 員 (山田、井日、江尻、金森、芝、永井の各先生)と 河場専
務理事が適宜ア ドバ イス協力。
(1)YSl―NDA/103 Circular http://ndm03.phys.sci osakttutac.jp/(2)YSl‐NDh/103 Proceedings http://ndm03.phys,scitosaka,u.acjp/proc/index.htm(3)Yamada web site http://www.yamadazaidan.jp/seika4̲1.html(4)International Statement of Double Beta Decays httpi//www.rcnp.osaka―u.ac.jp/〜ejiri/DBD―
Lett

Opening Address
Good morning ladies and gentlemen.
This is the first Yamada Symposium on Neutrinos and Dark A/1atter in
Nuclear Physics,YSl‐ NDM103.On behalf of the organizationcommittee of YSl―
NDA/103,we would like tO welcOme you to this
symposiunl at Nara,

Are are very grateful to a1l of you, particularly those coming far、
from abroad,fOr joining this symposium.We are very pleased tO havehere many distingtlished and active physicists
M′ fOr neutrinos
Orkingand dark matter(D卜71)in nuclear physics and fOr related subjects.
YSl―
N D ふ江0 3 i s t h e l s t s y m p o s i u m o f a n e w s e r i e s o f s y m p O s i astarted On the occasion of the 25th anniversary of Yamada Science
Foundation(YSF).
The purpose of the Yamada Symposium is tO discuss science frontiers and perspecjves of currently
developing subjects together with young researchers.The ideas of the neM/symposium will be given
later by the rFSF director general,Pro二
Y.Yamada.
Neutrinos and dark matter are current interesting subjects of nuclear and astrOparticle physics.
Experilnental and theoretical studies of lthe■
open ne、ハ′physics in the 21st centuries.
In fact recent studies of neutrino oscillations provide evidences for physics beyOnd the standard
electro―M′
eak theory. Neutrinos and dark matter are studied in nuclei as ■licro̲laboratOries,herev′
nuclear responses for neutrinos and dark matter are crucial. Neutrino nuclear interactiOns play
ilnportant roles in astrO̲nuclear prOcesses.

‑28‑

The present symposium NDM103 aiins at discussions on research frontiers and perspectives ofneutrinos and dark matter in nuclear physics.NDA/103 includes 15 scientific sessions in 5 days,and one
session and visit to Oto Cosmo Observatory,the Underground Laboratory of Osaka University,in one
day.
The subjects discussed in the present symposium are(1)neutrinO mass by beta and double beta
decays and neutrinos,(2)solar and supernova neutrinos and neutrinos in astrophysics,(3)neutrin0
nuclear interactions and physics of neutrino beams,(4)dark matter and cosm01ogy, and dark matterscattering from nuclel,and(5)related subjects「ヽヽe,on behalf of the NDlv103 organizatiOn cOmmittee,、ハァould like to express our cordial thanks to YSF
and the director general of YSF,Prof,Y.Yamada,for the generous suppOrts,and all IAC (International

Advisor Committee h/1embers)fOr valuable suggestions,WVe are indebted much tO Physic
Physics Laboratory and RClヾP,Osaka University for thetr collaborations A/1any thanks are due to Nara
Prefecture and Nara city,Oto Village,and Nara Convention bureau for their supports and helps.
ヽVe do hope you all enjoy physics discusslons in
YSl―
NDA403,Nara
was the ttrst modern capital in」apan,Started at 710.So please enjOy Japanese cultures in Nara as well in the free afternOon tinl
」une 10th,1lth,and in 13th.
Thank you for your attention

IIiro Ejiri
Chair person of YSl―
NDM103

WFelcome Address
Ladies and gentiemen,
On behalf of The Yamada Science Foundation, I would like toextend our hearty、 velcome to a1l of you,M/ho are participating in thefirst YamadalSymposium on Neutrinos and Dark A/1atter in Nuclear

Physics, particularly to those vho、 have come a long、

vay to」 apan

from various places all over the orld.
w′
Yamada Science Foundation was founded in 1977 at Osaka,」 apan.It
develops its activities by giving supports to the outstanding research
projects in the basic natural sciences,especially in the interdisciplinary
domains that bridges betM′ een the 、vell established research ields
such as physics,chemistry,and biology.The Foundation also provides
travei funds for the scientists to visit or to go out of Japan in Order tocarry out international collaborative projects.It also holds conferences and workshops etc..

As a private organization,we have the policy that the axis of our activities should be oriented in t
direction 6rthogonal to the large scale activities carried out by the government. Recently, thel to recognize the importance ofgovernments of lnost of the advanced countries,including Japan,see■basic natural sciences,and tend to invest a large amount of lnoney.The underlying idea would be that i
is useful for the future econoHlical development of the country through advanced technologicalapplications.This is in sotte sense legitilnate because the source of the investment is the public mon‑29‑Therefore the interests of the investlnent should be returned to the taxpayers in the form Of thepromotion of standard Of living of the natiOn.
However,from the view point of pure promotion of basic sciences,such the pragmatic stance is nOt
totally acceptable,because science is a part of the culture of human being hichM′ is valuable by itseli lnother、vOrds,science has its OM′
n internal motivation of development irrespective of whether it is usefulfor something else or not.It is this internal motivadOn that our Foundation is 、
villing tO give support,
although the amount of lnoney is rather inOdest.
Last year, 2002, M′as 25 years since it 、ハ′
as fOunded in 1977. In celebration of quarter century
annivもrsary,M′e decided tO start a neM′
activityi that is Organization Of a series of international symposia
called Yamada Symposium. Yamada Symposium prOvides a forum of discussiOns among the scientists
belonging tO different generations as 、 vell as different natiOnalities,Veヽput emphasis on different
generations Why? Because the achievements of culture shOuld be measured in the time scale ofcenturies rather than decadesヽVe envisage the f0110、
ving scheme Of Yamada Symposiun■: The scientists whO are the most active
members of the present generation and the scientists、 ハ′
hO are expected to be mOst active in the next
generation in a selected research field are invited to get together. The former presents the present
status and the perspective view Of the research field,、
vhlle the latter receive the messages and,throughhot discusslons,wOuld pick up sOme hints Of the M′
ay for hiln to proceed、B y this M′
ay,Yamada Symposia、
汗ould function as the driving mechanism to drive the science in the proper direction guided bサtheinternal mouvation,
A■ er some discussions as for the subject Of the ttrst Yamada Symposium,PrOfessOr Ejiri,a membもr Of
the AdvisOry Board of Our Foundation, proposed ̀IWeutrinos and Dark MIatter in Nuclear Physics'、
vhich、vas unanilnously agreed upOn,and、
ve are here today.

I hope all of you would enjoy this sympOsium and also relax some time staying in this attract
Nara,the ancient capitalapan.Thankof」
yOu,
Yasusada Yamada
Director general ttt YS president
Yamada Science Foundation

Summary ofthe YSl‐

NDM03

The irst Yamada Symposium On Neutrinos and Dark Matter in Nuclear Physics(YSl‐
NDM03)was heldat the Nara district in June 9̲14,2003.The Yamada Science Foundation(YSF)has started a new prOgramof the Yamada Symposium on the occasion Of it's25th anniversary.iFSl― NDA403 is the first symposiumof the nゃ、v series of the Yamada Symposium.This is a brieF suIIIInary of the YS]―
ND卜江03 symposium.
The purpose Of the Yamada Symposium is tO discuss research frOntiers and perspectives On currently
developing subjects together with yOunger researchers,who will play mttOr r01es in research activides
in future.
The symposiuln includes revie、vs on science frontiers and future perspectives,presentatiOns of recent
research wOrks and fOrums On ne、 ハ′science fronters and perspectives.The symposium encourages hOt
discuss10ns as well.

‑30‑

The present symposiuln NDい/103 aims at discussions on research frontiers and perspectives ofneutrinos and dark matter in nuclei. Active scientists of around 85 from 15 countries particlpated in
NDM03. They include many young and promising scientists.International advisory colnlnittee was
1 17 countries.
composed by 22 1eading scientists fro■
The symposium was held at the Nar4 new publiq hallin」

une loth,1lth,13th,and 14th,at the Nara

hotelin June 9th and at the Fureal Kohryu Hal1 0to village in the after■oon of」une 12th.Au participants
visited the Oto Cosmo Observatory,the underground laboratory of Osaka University,Here experimental
studies of neutrinos and dark lnatter are under progress.
The subjects discussed in YSl‐ NDヽ 103 are l)neutrino mass by beta and double beta decays andneutrinos. 2)solar and supernova neutrinos and neutrinos in astrophysics, 3)neutrinO nuclear
interactions and physics Of neutrino beams,41 dark matter and cosmology and dark matter studies by
nuclear scatterings,and 5)related subjects.
The scientific sess10ns cOnsist of an opening sesslon,14 sessions,a special sesslo■,and a poster session,
Scientiic subjects discussed are given in the section 2
1t was our great pleasure that Proi MIs Koshiba gave an impressive and instructive talk in the special
session on the neutrino astrophysics,for which the Novel prize was awarded to Proi Koshiba in 2002、.

vas、held in the afternoon of」
An informal meeting on double beta decays
une 13 to discusslnternational couaboration for futurepβ
decay experiments,This is based on our agreement as given in
the international statement,httpノ/www.rcnp.osaka‐u.acおejiri/DBD‐Lettp/〜
une 8th at the Nara New public Hall,theSocial programs include the weicome party in 17‑19」
reception in 19:30‑21」
une 9h at Nara hotel,the barbecue party in 17:15‑19 June 12th at Hoshino"kuniune 13th.The three afternoons in
Oto,the Koto and Shakuhachi concert and the banquet in 19:30‑22」
une 10th, 1lth, and 13th were free for discussions and visiting temples and shrines in Nara Park, A」international advisors were invited by the rFSF director Proi Y.Yamada to a dinner at Kikusui rou i
the evening of」
une llい.These social programs and the ample free discussion dmes,together with thevisit to the Oto underground laboratory,were very effective for further lively discusslons
they allヽVe are very pleased to hear from most participants during and/Or after the symposium vho、
have enjoyed much nice talks and active discusslons through YSl‐

NDM03.Many of them were

ilnpressed by the new type of the physics symposium,and by the idea of YS as presented by Proi Y.
Yamada in the opening session,
Acoordingly we have agreed to continue this type of the symposium on neutrinos and dark matter innuclear physics,next one being]NDM06 in Paris to be organized by Proi S,Jullian and the Orsay group.
NDM103 circular given in the web site,
The oudine of the symposium is found in the YSl‐
httpi〃ndm03.phys.sci.osaka‐u.acおp/
1.Scientific subiects Of NDM03
Neutrinos and dark matter are current subjects of nuclear particle and astro physics.Experimental
and theoretical studies of them are ow■ opening new ields of physics in the 21 st centuries. Recent
theory.
studies of neutrino oscillations provide evidences for physics beyond the standardweak
electro‐‑31‑

Neutrinos and dark matter are studied in nuclei, which are well isOlated systems of nucleons inquantum states Nuclear responses for neutrinos and dark matter are crucial for studies of theln in
nuclei.Neutrino nuclear interactions play important roles in astro nuclear
procё
sses.

The scientific sessiOns consists of 15 plenary sesslons and one poster session.The plenary sesslons are
as follows

lt Neutrino masses and nuclearβ
and β
βdeCays.
Il. Double beta decays and neutrinos
lll.Double beta decay experiments,future I
Ⅳ. Double beta decay experilnents,future II「ヽ.Solar v's,v osCillations,and v interactiOns.
WI.Solar v experilnents and perspectives.
W皿.Solar v productions and nuclear interactiOns with DMI
Illl.SupernOva v's and Astrophysics
IX̀Physics M/ith low energy v's,and v nuclear interactions.
X.Accelerator―based v physics
XI.Underground laboratories.
II.DA/1 and cosm010gy
llll.DX/1 experilnents
lll.Future Dい
71 experiments】
掛′.Perspectives Of v's and DMIin nuclear physics
掛′Special Session
ln the scientinc sesslons 54 invited papers were presented,and 13 contributions、vere displayed in theposter session.
い江any interesting 、vOrks and original views Of the perspectives on neutrinos and dark matter innuclear physics were presented.
The irst results on the double beta decay experiments M′
ith sub eV mass sensitivity were reported by
NEMO and CUORECINO groups,New projects On the double beta decays with even higher 30 meVsensitivity were presented by MajOrana,M00N,EXO and other groups,and Katrin group showed thebeta experilnent. These experimental 、vorks, together with new theoretical methOds On
progress of t‐
nuclear matrix elements presented by several nuclear theory grOups, are pronlising for studies of theneutrino lnasses. New results and progresses of the neutrino oscillations by SK,SNO,KamLArヾ D,FNAL
and others are quite impressive to establish the neutrino mass differences and the nlixing parameters.
High precislon studies of dark matter and theoretical studies of dark matter and cOsmology、

vere
discussed by several grOups. These works are impOrtant for ne、 v physics beyond the standard theOry
and fOr understanding our universe. Theoretical and experilnental works on supernova neutrinos andthe explosion processes、ぉrere presented by several groupst
Perspectves and futures of neutrino and DA/1 studies were extensively discussed.The last session(
session XV)iS a fOrum on the perspectives by leading physicists.
One Of highlights was obvlously the talk presented by Proi A/1.Koshiba in the special sess10■ .
Pro二 Koshiba discussed how the neutrino astrophysics was developed by hiln and his Kanlloka/SK
group and will be further studied by yOunger generation scientists,

‑32‑

.

Unique features of the present symposium are l)new and original works On current subjects onneutrino,dark matter and related subjects in nuclear physics,2)emphasis on interdisciphnary fields

particle nuclear and astrO physics, 3)active discussions among distinguished leading physicists andyoung pronlising physicists,and 4)discuSsions on perspectives and futures of research frontiers.

Invited papers presented in these sess10ns and short contributions presented in the poster sesslon
NDA/103 proceedings.This as
M′published in the web site,
given in the YSl―
httpノ/ndm03.phys.scl osaka‐utac.jp/proc/index.htm
The present symposium was supported by the Yamada Science Foundatlon(YSF)̀ヽ

Ve Would like toexpress our hearty gratitude to Proi Y. Yamada, the director general and the YSF for the generous

A403,and to Dr T.Kawaba and the YSF star for the corporation ttVe would ttk
s u p p o r t f o r Y SN lD ―thank all international advisors and all local organizers for valuable suggestions and symposium
organization and all YS committee members for kind suggestions̀い江any thanks are also due to Physics, OULNS and RCNP,Osaka University for various kinds ofork and other technical supports. WVe appreciate supports andsupports including the NDい71 netv′
corporation by MIr T.Kitamura,A/1ayor of Oto vlllage,Nara prefecture and Nara convention bureau.In
fact many of the participants M′
ere ilnpressed by the excellent speech by A/1r T, Kitamura and his
understanding of and support for the basic science
Special thanks are due to Dr I Ogawa(PhySiCS Osaka Univ),YSl― NDA/103 scientinc secretary for all
nice and hard works for YSl―
NDヽ403.
Links
YSl‐
NDA/103 circular
YSl―
NDA/103 Proceedings
lnternational Statement of Double Beta Decays

httpi//ndm03.phys.sci.osaka―u,ac,jp/
http://ndm03,phys.sci.osaka―u.ac.jp/proc/index̀htm
tt
h t t p : / / w w w r c n p . o suàkaac―j ep j/ i〜r i / D BLDe‐‑33‑