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ResultsfromtheMAJORANA DEMONSTRATOR
ClaraCuestaCIEMAT
onbehalfoftheMAJORANA COLLABORATION
14th MultiDark ConsoliderWorkshop24th -26th May2017,IFT-UAM/CSIC,Madrid,Spain
C.Cuesta 1
� S� Bs� � HSSy� � ,� ,a� � eHfaryH,K� � � na� rcHy � � � �� � r� � � aa,ar
� psa� � eHfaryH,K� � � pr � t � � � Ur, � � � rUSHe� � � � el � � � � �� � ,, ah � � pyB
� UHe,� ey,H,p,a� cUr� � pBSa� r� � aya� rB � � � p e� � � � pyyH�� Hs,Ur� � rpl � eHe� � � � � � HrB aesU� � � arkaK� � � yHSKaf � � � � � � spy af � � � � � H,eHsUf
� � h raeBa� � arsaSaK� � � ,HUe� S� � � Ur� ,UrK� � � arsaSaK� � � � SHcUreH� � � el, a� � eHfaryH,K� Uc� � � SHcUreH� � � � arsaSaK
� HBUS� y� � kr� SS� � � pae� � � , � � � e� � � ps� y� � a e� � � Url � e� � KySHs� � � S� e� � UUe� �� � H� a,,ar
� Uy� � S� t Uy� � � ,HUe� S� � � Ur� ,UrK� � � Uy� � S� t Uy� � � ah � � aDHBU� Hek � e� � p� � � ,afae� SSHU,,� � � � Sn � � � yy� rBuKs� � � aH, � HaS� ka� �
� � rrK � Ul rHkpau� � � � rrK� � � S� u� r� � � r� el Ue� � H,a� � � rH� e� � p
� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �
� SaD� el ar� � � r� � y � � � arkaK� � UeUf � SUf � � � S� l Ht Hr� � pt � ,Uf
� Ur, � � � rUSHe� � � , � ,a� � eHfaryH,K� � � el � � � � �� � ,, ah � � � � � raae
� � s� � Hl ka� � � ,HUe� S� � � Ur� ,UrK ral � � ar,r� el � � � � rSHa� � � f aear� � � Ue,K � Hl l Sa rUUs� � � � fHl � � � l cUrl � �
� U ar, � � rear� � � � ek� � Uek� � p
� y� s� � � eHfaryH,K� � � y� s� � � � � n� e� HrUK� yp� iHrH
� � BHcHB� � Ur, h ay,� � � ,HUe� S� � � Ur� ,UrK� � � HB S� el � � � � y Hek,Ue y� � B� � revpHy,� � rHB� � Unna� � � HB � rl � � � � � Upuay
� rHeBa,Ue� � eHfaryH,K� � � rHeBa,Ue� � � ah � � aryaK� r� � t � � � � � HUf � ea,,H
� paaeCy� � eHfaryH,K� � � Heky,Ue� � � � e� l �� K� e� � � r,He
� Up, � � � sU,� � � B UUS� Uc� � Heay� � el � � aB eUSUkK� � � � nHl � � H,K� � � Up, � � � sU,�� US,ar� � pe� k � e� � � � U,� � ee� � rHy,UccaryUe� � � eea� � � rHa� � prH� eU� � � � ral � � Ut nyUe
� aeeayyaa� � aB � � eHfaryH,K� � � UUsafHSSa� � � aeeayyaa� � rK� � Hl l
� aB eHyB a� � eHfaryH,m,� � NeB ae� � � el � � � D� � S� eBs� ey,H,p,a� � � peHB � � � art � eK� U H� y� � Ul a� � � py� eea� � ar,aey
� eHfaryH,K� Uc� � Ur, � � � rUSHe� � � � � naS� � HSS� � � Ur, � � � rUSHe� � � � el � � � � �� Ut � y� � � Sl h aSS� � � Ut � y� � HSSHyy� � � rHy� � � pca� � aKBU� � aeeHek� � � � rs� � Uh a� �
� � t paS� � � aHiar� � � rHy,Un ar � � � pk eayyK� � � pSl ae� � , t � e� � � t He� � � kar� � � ee� � � aHea� �� aei � t He � � esy� � � rHy� � Urrae� � � U e� � � � HSsaryUe
� eHfaryH,K� Uc� � Up, � � � rUSHe� � � � USpt H� � � � Up, � � � rUSHe� r� es� � fHkeUea� � � HeBa� � pHyanna� � � � fHl � � al ayB H� � � SHe,� � Hyat � e
� eHfaryH,K� Uc� � Up, � � � sU,� � � � art HSSHUe� � � Up, � � � sU,�� � � � � r,Ue� � � aevHe� � p
� eHfaryH,K� Uc� � aeeayyaa� � � eUDfHSSa� � � aeeayyaa� prH� crat aesU� � � el rah � � Unau
� eHfaryH,K� Uc� � � y Hek,Ue� � � a� ,,Sa� � � � y Hek,Ue� a � y,H� e� � SfHy� � � Ut � � prrH,,� � � HB� � � ppBs� � � S� r� � � pay,� � � � � yUe� � a,h HSar� � � pSHa,� � � rpyusU�
� e� � pHee� � � � fHl � � a,aryUe� � � � S,ar� � a,,py� � � � � � � � � � t Hy � � U ar,yUe� � � HBs� � Upc� �� Ht � � � e� � aB aS
� a� � � � � � � � � � USS� Ur� ,HUe
� S� Bs� � HSSy� � ,� ,a� � eHfaryH,K� � � na� rcHy � � � �� � r� � � aa,ar
� psa� � eHfaryH,K� � � pr � t � � � Ur, � � � rUSHe� � � � el � � � � �� � ,, ah � � pyB
� UHe,� ey,H,p,a� cUr� � pBSa� r� � aya� rB � � � p e� � � � pyyH�� Hs,Ur� � rpl � eHe� � � � � � HrB aesU� � � arkaK� � � yHSKaf � � � � � � spy af � � � � � H,eHsUf
� � h raeBa� � arsaSaK� � � ,HUe� S� � � Ur� ,UrK� � � arsaSaK� � � � SHcUreH� � � el, a� � eHfaryH,K� Uc� � � SHcUreH� � � � arsaSaK
� HBUS� y� � kr� SS� � � pae� � � , � � � e� � � ps� y� � a e� � � Url � e� � KySHs� � � S� e� � UUe� �� � H� a,,ar
� Uy� � S� t Uy� � � ,HUe� S� � � Ur� ,UrK� � � Uy� � S� t Uy� � � ah � � aDHBU� Hek � e� � p� � � ,afae� SSHU,,� � � � Sn � � � yy� rBuKs� � � aH, � HaS� ka� �
� � rrK � Ul rHkpau� � � � rrK� � � S� u� r� � � r� el Ue� � H,a� � � rH� e� � p
� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � �
� SaD� el ar� � � r� � y � � � arkaK� � UeUf � SUf � � � S� l Ht Hr� � pt � ,Uf
� Ur, � � � rUSHe� � � , � ,a� � eHfaryH,K� � � el � � � � �� � ,, ah � � � � � raae
� � s� � Hl ka� � � ,HUe� S� � � Ur� ,UrK ral � � ar,r� el � � � � rSHa� � � f aear� � � Ue,K � Hl l Sa rUUs� � � � fHl � � � l cUrl � �
� U ar, � � rear� � � � ek� � Uek� � p
� y� s� � � eHfaryH,K� � � y� s� � � � � n� e� HrUK� yp� iHrH
� � BHcHB� � Ur, h ay,� � � ,HUe� S� � � Ur� ,UrK� � � HB S� el � � � � y Hek,Ue y� � B� � revpHy,� � rHB� � Unna� � � HB � rl � � � � � Upuay
� rHeBa,Ue� � eHfaryH,K� � � rHeBa,Ue� � � ah � � aryaK� r� � t � � � � � HUf � ea,,H
� paaeCy� � eHfaryH,K� � � Heky,Ue� � � � e� l �� K� e� � � r,He
� Up, � � � sU,� � � B UUS� Uc� � Heay� � el � � aB eUSUkK� � � � nHl � � H,K� � � Up, � � � sU,�� US,ar� � pe� k � e� � � � U,� � ee� � rHy,UccaryUe� � � eea� � � rHa� � prH� eU� � � � ral � � Ut nyUe
� aeeayyaa� � aB � � eHfaryH,K� � � UUsafHSSa� � � aeeayyaa� � rK� � Hl l
� aB eHyB a� � eHfaryH,m,� � NeB ae� � � el � � � D� � S� eBs� ey,H,p,a� � � peHB � � � art � eK� U H� y� � Ul a� � � py� eea� � ar,aey
� eHfaryH,K� Uc� � Ur, � � � rUSHe� � � � � naS� � HSS� � � Ur, � � � rUSHe� � � � el � � � � �� Ut � y� � � Sl h aSS� � � Ut � y� � HSSHyy� � � rHy� � � pca� � aKBU� � aeeHek� � � � rs� � Uh a� �
� � t paS� � t paS� � � aHiar� � � rHy,Un ar � � � pk eayyK� � � pSl ae� � , t � e� � � t He� � � kar� � � ee� � � aHea� �� aei � t He � � esy� � � rHy� � Urrae� � � U e� � � � HSsaryUe
� eHfaryH,K� Uc� � Up, � � � rUSHe� � � � USpt H� � � � Up, � � � rUSHe� r� es� � fHkeUea� � � HeBa� � pHyanna� � � � fHl � � al ayB H� � � SHe,� � Hyat � e
� eHfaryH,K� Uc� � Up, � � � sU,� � � � art HSSHUe� � � Up, � � � sU,�� � � � � r,Ue� � � aevHe� � p
� eHfaryH,K� Uc� � aeeayyaa� � � eUDfHSSa� � � aeeayyaa� prH� crat aesU� � � el rah � � Unau
� eHfaryH,K� Uc� � � y Hek,Ue� � � a� ,,Sa� � � � y Hek,Ue� a � y,H� e� � SfHy� � � Ut � � prrH,,� � � HB� � � ppBs� � � S� r� � � pay,� � � � � yUe� � a,h HSar� �� HB� � � ppBs� � � S� r� � � pay,� � � � � yUe� � a,h HSar� �� HB� � � ppBs � pSHa,� � � rpyusU�
� e� � pHee� � � � fHl � � a,aryUe� � � � S,ar� � a,,py� � � � � � � � � � t Hy � � U ar,yUe� � � HBs� � Upc� �� Ht � � � e� � aB aS
�� � � � � � � � � � � � �
� � � � L� � � o� � � � � � � o� � � � L� sFhf 4� � � � � � � � � � � � � � � � o� � � � � � � � � � � � � � � � � Le� � � � � � � � o� � � � � � � � � � � L� � � f dd� � � � � � � � � � � � � � � � � � L� � � L� 0s � � � � � � L� Uf Ri � � � � ’
R� � � o� L 8� � 8L8e� 1� � m� r� � l � sOo o� � hmo4I� � � e� � g g� � o� � � � L� e� l � Rgho� � s� o� mt � 6� � t hl mb� � bmbO� � t r� � � mt l l � � � J � r u � l m
� ss5� � � � � � � � � � � L� � L� � By. IU� e� � t � � /U) � � l r � � � � � UF � � � � rOom� soB67I7� e� � t � � l � m� �B � � m� � mt r� � � � � l t st � Oa� � LmO � C t l mL� t l m� � mI
� U� � � � � � � � � � � L� � � e� L� L Bhsmr� L� s� � l C� � s� � mrt � t ru � � � � hB yy� e� � t � � � � m� � mt ro� � r� � rOt om� mB l � mhr� ssO� o� � s� � s�
� � � � � � � L� � � � � �B st AL� � � e� rt hl � � � oo M� � � h� � l � � � �o� � s� � A m� � � � m M� � u ht l � M� mt
� I� � h� om� 7
� � � � � Rt r� l � � � � u t l omr� mt r� 1- TDD4� hl � � � � � O� � � � � � � � � � � t � � � h� s� � r� � � Oo � oC� � � � � � � rm � s� � � omrt � Oo � oC� � � � � � h� s� � r�
� � Oo � o� A m� � � � � m t l � s� � t l mr � hm t l o� � rt u � l m� rl � m t l � s� � t ss� � t r� mt ro
� � � � r� � L � � u t l omr� m� � � � � e� rt hl � o� st A � � l t h� � � mt � Rhom � O� � h s� l � � � � mt l l � o� � s� � � J � r u � l mIL � om� � s o� � � � � o � s mO� mt � � t l omrh� m� W� � � s� � u t � hs� r� � rr� Oo� t � � � � � � � m� � mt roIL � � � r� � � o� � t r� � � � m t l � s� � Oo � o� � � Ot l � � m� � � om� l � � r� � u t � � sI
� � � � � � � � � � � � � � � � � � u s� u � l m� m t l
� I� � h� om� 7
t � hs� � 6a� 6FI. � e� � 1y- 4� � l r� �, IF� e� � 1. 4� l � m� �
t � hs� � ya� 6yI. � e� � 16, 4� � l r� �/ I/ � e� � 1674� l � m� �
� OB� � mI� y- 6, C�� l � s� l om� ss� m t l oC� � � I � y- 6, � t l � t l �
� � y- 6F
• Extensivecampaignstoqualify,procureandproducecleanmaterials.• Basedonachievedassaysofmaterials,whenULusedULascontribution.• NIMA828(2016)22
BackgroundModel
C.Cuesta 5
DavisCampusattheSanfordUndergroundResearchFacility
• 4,850feetbelowthesurface.• Cosmicrayshielding.• Cleanroomconditions.
MAJORANA UndergroundLaboratory
C.Cuesta 6
• Innerelectroformedcopperlayerinstalled• Outercoppershieldinstalled• Pbshieldinstalled• Rnexclusionboxinstalled• Polylayersinstalled• Vetopanelsoperational
arXiv:1602.07742
Shield
C.Cuesta 7
Outercopper+leadshieldRadonexclusionbox
� s� � mrt � t ru � � � � t � r
� � � � � � � � t � r� m� � � 6- � � � m� o� � m� m� � � � � u t r� rO� � s� � l � � t t u � � � � s mO� � m� m� � � 7/ , - n� s� M� s�� l � � F � � � m� o� � m� � � o� � sst A � � � � o m� � � m� � � � � I �
� � ss� � t � r� A � o� u � � � l � � � � m� m� � � � � M o� � � u hoI� � � � � � s� � mrt � t ru l � � t � � � t � r� � t u s� m� � � l � � O� y- 6, I�
� y7U7� e� � t � � � s� � mrt � t ru � � � � t � r� rt � h� � �� 66. F� e� � A � o� l om� ss� � � l � m� � � � � � � � � � � � � �
� I� � h� om� /
� s� � mrt � t ru l � � � � m� o� l � � � �
l o � � m t l � t � � � � � � t � r� t l � u � l � r� so
� � � � t � r� � � m� r� mhrl l � � t l � s� m� �� � � � � � � O� � � � l � 1� M� 4� 9� - I6� S � f be�� � � � � � O� � � � l � 1� M� 4� � 9� - I6� S � f be�
� hmO� � O� s� o� � l � � � � m� � o� mo
� I� � h� om� .
� � � � � s � r� m t l
� I� � h� om� 6-
� o l � � � homt u � yy/ � � � s l � � ot hr� � o� � l � � rt hm l � � r� u tm� � � � s � r� m t l a� hsm L � � e� � mm� r� � u st O� � C� t l s l � � � � m� � � o� � omt r� o� r� ohsmo� � � s � r� m t l � � � ra� i � r� Ma6U- yI- y7FFkC� oh� u mm� � � mt � � �
� � � � � m� � mt r� � � � � � � r� t ru � l � �
� I� � h� om� 66
� � � � � hmo� � r� � t m u N� � � mt � e� � � . - ) � o l � s� Lo m� � � l � � –6- ) � u hsm Lo m� � � M� l mo� - TDD� o� � � o l � s� � o m� � � M� l m� y- / � s� yF67� e� � E � � l � � � M� � � r� rt � h� m t l � � l � � � u m� yE� � t m� � Eno � o� � � � � rt u � � � m� � mt ro� g � � t h� s� � � o� � � � � � e� 1� � � 4C� o l � s� � o m�� � l � � E � o� � � o� � rt u � � � m� � mt ro� g � � l � s� � � o� � � � � � e� 1� � � 4C� u hsm Lo m�
P425
75A
P426
61C
P425
38A
B847
4P4
2664
A
P426
65A
P426
98A
P425
38B
P425
73A
B845
5B8
465
B846
9
P425
75B
P426
61A
P425
74C
P425
74A
P426
62A
B848
2P4
2574
B
P426
62B
P425
37A
P427
48A
B848
1
B857
6B8
594
P427
49A
P427
49B
B860
7
B846
6
B848
7P4
2853
B
P235
17A
P429
09B
P429
09A
B871
7
Acce
ptan
ce (%
)
0
10
20
30
40
50
60
70
80
90
100
Tl DEP208 Tl DEP Mean208
Tl SEP208 Tl SEP Mean208
0vBB Cont. 0vBB Cont. Mean
y- / � s� � � � � 1o l � s� �o m� � � M� l mo4� � J � � �� mt � . - )
y- / � s� � � � � 1u hsm s� �o m� � � M� l mo4�r� � h� � � � mt � 6- )
� � s� O� � � � � � r� � � � � � t M� rO� � l � � � s � � o
� I� � h� om� 6y
� � s � � � � � � e� rt hl � � A m� � � � � r� � � � � � l � r� � o� t � o� rM� � � l � � � -� � � � r� � � t � � m� � o� � � M� l mo� � r � mo� � st l � � m� � � � � m� � mt r� ohr� � � � C� l t m� � hse� � rt � h� � o� � � � om l � m M� � A � M� � t ru � � sst A l � � � � � � � � � � � � � l � O� � hm
Slow drift of charges along passivated surface results in very slow signal component
• Unexpected background found in commissioning run (1700-3500 keV). • Identified as arising from alpha particles impinging on passivated surface. • Results in prompt collection of some energy, plus very slow collection of remainder. • Produces a distinctive waveform resulting in a high efficiency cut.
Example pole-zero corrected waveforms
MJD
F-20
16-0
4-06
-001
-R1
� � � e� rt hl � � � � � mrhu � 1� � 0� W� � � 74
� � t A � om� � � � e� rt hl � � � t l � � hr� m t l C� A m� � � t m� � u t � hs� o� l � o� � s� I� 1� r� M t ho� � � m� � r� o� l m� � � � m� � � hmr l t � 6F� A � o� � rt u � t � hs� � 6C� � � � - b64
� I� � h� om� 60
� � � mrhu � o� t u l � m� � � � OyTDD
� om u � m� � � - TDDL� � � � O� � � � � e� � 1� � 0� W� � � 74
� � J t ohr� a� 6I0. � e� � O
� � � m� r� � hmoC� 6� � t hl m� l � 7- - � e� � �A l � t A � � � l m� r� � � � m� y- 0. � e� � �1- TDD� � � e4
� � rt R� � m� � � � � � e� rt hl � � r� m� � o�, I6� x/ I. � � b1� � � m� O4� t r� � �yI. � 1 6L � � 04� W� IF� e� � � 1 y � L� � 74� � � C� 1F/ ) � � � 4I
� � � � e� rt hl � � l � � J � t � �I/ � J � 6- � b1e� � � e� � O4
� � l � sOo o� � hmo� � r� � om ss� � � l � �t m u N� � I
� I� � h� om� 67
h� � � st A � r� � � � e� rt hl � � l � � l r � � � � � � � m� � mt roC� � h� � mt � m� � � m � � m� � J t ohr� � � t l mrt s� � J t ohr� C� � l r � � � � a� 7U/ � F� e� L� � OoC� l � mhr� sa� d6. , � e� L� � Oo� � rt u � y- L7- � e� � a� d- I- 7� � mobe� L� Le� �� � r m hu � o� t � M t ho� � l � � � t u l � m� o� l � l � mhr� s� � � m� � mt ro� � � st A � y- � e� �� � � � � � l � O� � � st A � , � e� � o� hl � � r� omh� O
� � t A � r� � � � e� rt hl � � l � � � 6L, C�� l � sOo o� t l L� t l �
� t AL� l � r� O� � � � mrhu � l � � � -
� I� � h� om� 6,
� � OoI� � � MI� � � mmI� 66/ � 1y- 6U4� 6F6/ - 6
�
� � � � t AL� l � r� O� � rt � r� u
� I� � h� om� 6F
� a � � � L� � L� � � L� � � � � � � � � � � � a � o � L� � � � � � � � � � � c � � � � � � � a 5� � � � � e� � � � � � � r � � � � � r � t � � � L� � � � � � � �� � � � m� 1–6- � � � � b� y4� � � � o� � r� � � o � J � � oo� –� yLyI, � e� � � rt u � l h� s� � r� r� � t so� � t ot l � � h � rA � � e � � re� � mm� r � l t u � st ho� � � e� –� 6- - � e� �� � � hs L� J � sho t l � � r l � s� � � t s� m t l � � � JLr� O� � � e� � m� 6- IF� e� �� � s� � mrt l � � � � � Oa � � � JLr� O� � � e� � mC� 66I6� e� �� � t s� r� � J t l o � J � � oo� l � � t l m l hhu � t r� � � eo� –� 6, � e� �
� � re� � mm� r� � t h s l � � � � ohsmo
� t r� � � L- C� 60� � l r � � � � � � � m� � mt ro� � l � � � � 7U/ � e� L� � O� � J t ohr� a� t om� omr l � � l m� s u m� o� � t r� o� h� t o� � s� r � J t l Ls e� � � rm � s� o� 1u � oo� 66I/ � e� � 4� . - ) � h � r� s u m� � t r� m� � � � t h s l � � � t l om� l mo� � � o� � � t l � m� � � � J � � m� � � � M� l m� r� m�
� I� � h� om� 6U
� � OoI� � � MI� � � mmI� 66/ � 1y- 6U4� 6F6/ - 6
SummaryandOutlook
• The76GeenrichedpointcontactdetectorsdevelopedbyMAJORANA
– haveattainedthebestenergyresolution (2.4keV FWHMat2039keV)ofanyββ-decayexperiment.
– provideexcellentpulseshapediscrimination reductionofbackgrounds.
– atlowenergieshavesub-keV energythresholdsandexcellentresolutionallowingtheDEMONSTRATOR toperform sensitivetestinthisregionforphysicsbeyond thestandardmodel.
• The DEMONSTRATOR’s initialbackgrounds areamongstthelowestbackgrounds intheROIachievedtodate(approaching toGERDA’srecentbestvalue).Attainedbydevelopmentandselectionofultra-lowactivitymaterialsandlowmassdesigns.
• Combining thestrengthsofGERDA andtheMAJORANA DEMONSTRATOR, theLEGENDCollaboration ismoving forwardwithaton-scale76Gebasedexperiment.Basedonthesuccessestodate,LEGENDshouldbeabletoreachthebackgrounds (~0.1c/(ROIty)andenergyresolution necessaryfordiscoverylevelsensitivitiesintheinvertedordering region.
C.Cuesta 18
� hu u � rO� � l � � � hmst t e
� I� � h� om� 6.
� � � � � � � � � � � � � � � L� o� L� � � � � � � � � � � � L� n� a � L� � � � L� �� � � o� � � � � � � � � � � � � � L� � � � � � � � � � � � � � L� u�